JPH08133260A - Vessel formed by biaxially drawn blow molding and mold therefor - Google Patents
Vessel formed by biaxially drawn blow molding and mold thereforInfo
- Publication number
- JPH08133260A JPH08133260A JP29380594A JP29380594A JPH08133260A JP H08133260 A JPH08133260 A JP H08133260A JP 29380594 A JP29380594 A JP 29380594A JP 29380594 A JP29380594 A JP 29380594A JP H08133260 A JPH08133260 A JP H08133260A
- Authority
- JP
- Japan
- Prior art keywords
- center
- annular
- molding
- annular grounding
- valley
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000071 blow moulding Methods 0.000 title claims abstract description 9
- 238000000465 moulding Methods 0.000 claims description 54
- 230000003014 reinforcing effect Effects 0.000 claims description 49
- 230000002093 peripheral effect Effects 0.000 claims description 32
- 230000000694 effects Effects 0.000 description 12
- 230000009191 jumping Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000007323 disproportionation reaction Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/0261—Bottom construction
- B65D1/0276—Bottom construction having a continuous contact surface, e.g. Champagne-type bottom
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、二軸延伸ブロー成形容
器及びその成形型に関し、特に、耐熱性を向上させた二
軸延伸ブロー成形容器の底部構造及びその成形型に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biaxially stretch blow molded container and a mold thereof, and more particularly to a bottom structure of a biaxially stretch blow molded container having improved heat resistance and a mold thereof.
【０００２】[0002]
【従来の技術】周知のように、二軸延伸ブロー成形され
た容器は、例えば、ポリエチレンテレフタレート（ＰＥ
Ｔ）製の容器の場合でいうと、耐ガスバリア性，透明
度，強靱性，衛生面等に多くの利点を有する。2. Description of the Related Art As is well known, a biaxially stretch blow molded container is made of, for example, polyethylene terephthalate (PE).
In the case of the container made of T), it has many advantages in gas barrier resistance, transparency, toughness, hygiene and the like.
【０００３】ところで、二軸延伸ブロー成形容器の一つ
として、耐熱瓶と称される二軸延伸ブロー成形容器があ
る。この二軸延伸ブロー成形容器は、加熱殺菌された高
温の飲料水等の内容物を充填するために用いられること
がある。By the way, as one of the biaxially stretch blow molded containers, there is a biaxially stretch blow molded container called a heat resistant bottle. This biaxially stretch blow-molded container is sometimes used for filling contents such as hot sterilized hot drinking water.
【０００４】二軸延伸ブロー成形容器は、内容物が冷め
ると内容物の減容によって減圧し、容器壁部が変形す
る。そこで、この減容減圧がおきた場合に、容器壁部の
変形を吸収させるための構造として、容器周方向に形成
されてボトル内方に向け窪んでいる縦長の凹部を複数設
けた構造がある。このような構造は減圧パネルと称され
ている。When the contents of the biaxially stretched blow-molded container are cooled, the volume of the contents is reduced to reduce the pressure and the container wall is deformed. Therefore, as a structure for absorbing the deformation of the container wall when this volume reduction and decompression is performed, there is a structure in which a plurality of vertically elongated recesses formed in the container circumferential direction and recessed inward of the bottle are provided. . Such a structure is called a decompression panel.
【０００５】一方、前記二軸延伸ブロー成形容器の底部
は、通常、外周部から中心にかけて容器の内方に向けて
突出する凸部が形成された形状とされている。このよう
に、凸部の外周に接地面を形成することにより、自立性
を持たせるようになっている。On the other hand, the bottom of the biaxially stretched blow-molded container is usually formed with a convex portion projecting inward from the outer peripheral portion toward the center. In this way, by forming the grounding surface on the outer periphery of the convex portion, the self-supporting property is provided.
【０００６】[0006]
【発明が解決しようとする課題】前記従来の二軸延伸ブ
ロー成形容器にあっては、加熱殺菌した高温の内容物を
充填すると、底部が変形してしまうことがあるという問
題があった。The above-mentioned conventional biaxially stretched blow molded container has a problem that the bottom portion may be deformed when the sterilized high temperature contents are filled.
【０００７】このことは、二軸延伸ブロー成形容器の底
部は、容器の壁部のうちで、他の壁部に比べて十分に延
伸薄肉化されない箇所の一つであることに起因してい
る。This is because the bottom of the biaxially stretch blow-molded container is one of the wall portions of the container that is not sufficiently stretched and thinned as compared with the other wall portions. .
【０００８】これを図９により説明すると、この図９に
は下側に二軸延伸ブロー成形容器の底部２の縦断面図が
示されており、その上部に凸部４の高さ状態を等高線
ａ，ｂ，ｃ，ｄで示すとともに、この等高線で示した図
に重ねて凸部４の延伸倍率（配向度）を示すグラフを重
ねて表示している。This will be explained with reference to FIG. 9. In FIG. 9, a vertical sectional view of the bottom portion 2 of the biaxially stretched blow-molded container is shown on the lower side, and the height state of the convex portion 4 is shown on the upper portion of the contour line. In addition to a, b, c, and d, a graph showing the stretching ratio (orientation degree) of the convex portion 4 is also superimposed on the figure shown by the contour lines.
【０００９】この図で示すように、凸部４は、底部２の
外周部に位置する環状接地部６から中心部８にかけて滑
らかな傾斜で形成されており、凸部４の環状接地部６の
近傍においてはある程度の配向度が容易に得られる。し
かし、底部２の中心部８においてはほとんど延伸されて
おらず、プリフォームの肉厚のまま厚肉の状態となって
おり、この中心部８から環状接地部６へ向かって徐々に
配向度が向上するようになっている。As shown in this figure, the convex portion 4 is formed with a smooth slope from the annular grounding portion 6 located on the outer peripheral portion of the bottom portion 2 to the central portion 8, and the annular grounding portion 6 of the convex portion 4 is formed. A certain degree of orientation can be easily obtained in the vicinity. However, the center portion 8 of the bottom portion 2 is hardly stretched, and the preform remains as thick as it is, and the degree of orientation gradually increases from the center portion 8 toward the annular grounding portion 6. It is supposed to improve.
【００１０】このように底部２の中心部８付近において
配向度が低い状態になっていると、耐熱性が十分でな
く、加熱殺菌された高温の内容物が充填された際に内容
物の熱による軟化と内容物の荷重により凸部４が下方へ
落ち、最悪の場合、環状接地部６よりも下方に飛び出し
てしまうことになる。When the degree of orientation is low in the vicinity of the central portion 8 of the bottom portion 2 as described above, the heat resistance is not sufficient, and the heat of the contents when heat-sterilized at high temperature is filled. The softening and the load of the contents cause the convex portion 4 to fall downward, and in the worst case, the convex portion 4 may protrude below the annular grounding portion 6.
【００１１】本発明は、前記従来の問題点に着目してな
されたもので、その目的は、底部凸部において、配向度
の低い底部中心部付近の耐熱性を向上させ、なおかつ、
環状接地部付近の耐熱性を維持し、高湿の内容物が充填
された時の底部の変形を防止することのできる二軸延伸
ブロー成形容器及びその成形型を提供することにある。The present invention was made in view of the above-mentioned conventional problems, and an object thereof is to improve heat resistance in the vicinity of the center of the bottom portion where the degree of orientation is low in the bottom convex portion, and
It is an object of the present invention to provide a biaxially stretch blow-molded container and a molding die thereof that can maintain heat resistance in the vicinity of an annular grounding portion and prevent deformation of the bottom portion when filled with a high-humidity content.
【００１２】[0012]
【課題を解決するための手段】前記目的を達成するた
め、第１の発明にかかる二軸延伸ブロー成形容器は、二
軸延伸された薄肉の胴部と、胴部の下端に設けられた底
部とを有し、前記底部は環状接地部と、この環状接地部
から底部中心におけて容器内方へ向けて突出する凸部を
有し、前記凸部は、中心からの距離が短く中心に向かっ
て突出する谷部と中心からの距離が長く外周方向に向か
って突出する山部が周面に沿って交互に設けられた補強
部を有する二軸延伸ブロー成形容器において、前記補強
部は、環状接地部からの高さの異なる複数位置における
それぞれの底部中心軸から山部の頂部と谷部の頂部との
距離差が、上方よりも下方で小さく形成されていること
を特徴としている。In order to achieve the above object, a biaxially stretched blow-molded container according to the first invention is a biaxially stretched thin body portion and a bottom portion provided at the lower end of the body portion. And the bottom portion has an annular grounding portion and a convex portion projecting inward from the annular grounding portion toward the center of the bottom portion, and the convex portion has a short distance from the center. In a biaxially stretched blow-molded container having a reinforcing portion in which a mountain portion protruding toward the outer peripheral direction has a long distance from the center and a protruding valley portion is provided alternately along the peripheral surface, the reinforcing portion, It is characterized in that the difference in distance between the tops of the peaks and the tops of the valleys from the respective center axes of the bottoms at a plurality of positions having different heights from the annular grounding portion is formed to be smaller in the lower portion than in the upper portion.
【００１３】第２の発明にかかる二軸延伸ブロー成形容
器は、第１の発明に加え、前記凸部に設けられた補強部
は、環状接地部からの高さの異なる複数位置におけるそ
れぞれの底部中心軸から山部の頂部と谷部の頂部との距
離差が底部中心から環状接地部に向かって徐々に小さく
成形され、縦断面で環状接地部から底部中心へ向かって
滑らかな傾斜を有することを特徴としている。In the biaxially stretched blow molded container according to the second invention, in addition to the first invention, the reinforcing portion provided on the convex portion has bottom portions at a plurality of positions having different heights from the annular ground portion. The difference in distance between the top of the peak and the top of the valley from the central axis is gradually reduced from the center of the bottom toward the ring-shaped ground contact, and the section has a smooth slope from the ring-shaped ground contact toward the center of the bottom. Is characterized by.
【００１４】第３の発明にかかる二軸延伸ブロー成形容
器は、第１の発明に加え、前記凸部に設けられた補強部
は、段部を有することを特徴としている。The biaxially stretch blow-molded container according to the third invention is characterized in that, in addition to the first invention, the reinforcing portion provided on the convex portion has a step portion.
【００１５】第４の発明にかかる二軸延伸ブロー成形容
器は、第３の発明に加え、前記段部は、縦断面で環状接
地部からの高さの異なる複数位置に複数設けられてお
り、各段部に設けられた山部と谷部は、それぞれ底部中
心軸から山部の頂部と谷部の頂部との距離差が、環状接
地部に近い段部になるにしたがって小さく形成されてい
ることを特徴としている。In the biaxially stretch blow-molded container according to the fourth aspect of the present invention, in addition to the third aspect of the present invention, a plurality of the stepped portions are provided at a plurality of positions having different heights from the annular grounding portion in the longitudinal section, The crests and troughs provided on each step are formed such that the difference in distance between the top of the crest and the top of the trough from the center axis of the bottom becomes smaller toward the step closer to the annular grounding part. It is characterized by that.
【００１６】第５の発明にかかる二軸延伸ブロー成形容
器は、段部は複数設けられており、最外周位置の段部は
円形又は多角形に形成されていることを特徴としてい
る。The biaxially stretch blow-molded container according to the fifth aspect of the present invention is characterized in that a plurality of step portions are provided, and the step portion at the outermost peripheral position is formed in a circular or polygonal shape.
【００１７】第６の発明にかかる二軸延伸ブロー成形容
器は、胴部の下端に設けられた底部とを有し、前記底部
は環状接地部と、この環状接地部から底部中心にかけて
容器内方へ向けて突出する凸部を有し、前記凸部は、中
心からの距離が短く中心に向かって突出する谷部と、中
心からの距離が長く外周方向に向かって突出する山部が
周面に沿って交互に設けられた補強部を有する二軸延伸
ブロー成形容器に置いて、前記凸部は、環状接地部から
容器内方へ上昇傾斜する傾斜面と、この傾斜面の上端に
形成される環状段部とを備え、前記環状段部が円形に形
成されていることを特徴としている。A biaxially stretched blow-molded container according to a sixth aspect of the present invention has a bottom portion provided at the lower end of the body portion, the bottom portion being an annular grounding portion, and the inside of the container extending from the annular grounding portion to the center of the bottom portion. Has a convex portion that projects toward the center, and the convex portion has a trough portion that has a short distance from the center and projects toward the center, and a mountain portion that has a long distance from the center and projects toward the outer peripheral surface. Placed on a biaxially stretched blow-molded container having reinforcing portions alternately provided along the convex portion, the convex portion is formed on the upper surface of the inclined surface and the inclined surface that is inclined upward from the annular grounding portion toward the inside of the container. And an annular step portion, the annular step portion having a circular shape.
【００１８】第７の発明にかかる二軸延伸ブロー成形容
器は、胴部の下端に設けられた底部を有し、前記底部は
環状接地部と、この環状接地部から底部中心にかけて容
器内方へ向けて突出する凸部を有し、前記凸部は、中心
からの距離が短く中心に向かって突出する谷部と、中心
からの距離が長く外周方向に向かって突出する山部が周
面に沿って交互に設けられた補強部を有する二軸延伸ブ
ロー成形容器において、前記凸部は、環状接地部から容
器内方へ上昇傾斜する傾斜面と、この傾斜面の上端に形
成される環状段部が多角形に形成されていることを特徴
としている。A biaxially stretch blow-molded container according to a seventh aspect of the present invention has a bottom portion provided at the lower end of the body portion, the bottom portion being an annular grounding portion and an inward direction from the annular grounding portion to the center of the bottom portion. There is a convex portion projecting toward the convex portion, and the convex portion has a valley portion having a short distance from the center and projecting toward the center, and a mountain portion having a long distance from the center and projecting toward the outer periphery on the peripheral surface. In a biaxially stretch blow-molded container having reinforcing portions alternately provided along the convex portion, the convex portion has an inclined surface that is inclined upward from an annular grounding portion toward the inside of the container, and an annular step formed at the upper end of the inclined surface. The part is formed in a polygonal shape.
【００１９】第８の発明にかかる二軸延伸ブロー成形容
器は、第６又は第７の発明に加え、前記凸部に設けられ
た補強部は、谷部が縦断面で環状接地部から底部中心へ
向かって滑らかな傾斜を有することを特徴としている。In addition to the sixth or seventh invention, the biaxially stretched blow-molded container according to the eighth invention is such that, in the reinforcing portion provided on the convex portion, the valley portion is a vertical cross section and the center of the bottom portion extends from the annular ground portion. It is characterized by having a smooth slope toward.
【００２０】第９の発明にかかる二軸延伸ブロー成形容
器は、第６又は第７の発明に加え、前記凸部に設けられ
た補強部は、周方向に沿って形成された段部を有するこ
とを特徴としている。In the biaxially stretch blow-molded container according to the ninth invention, in addition to the sixth or seventh invention, the reinforcing portion provided on the convex portion has a step portion formed along the circumferential direction. It is characterized by that.
【００２１】第１０の発明にかかる成形型は、外周位置
に形成された環状接地部成形部と、この環状接地部成形
部から中心にかけて容器内方へ突出する凸部成形部とを
有する上底型を備え、前記凸部成形部は、中心からの距
離が短く中心に向かって突出する谷部成形部と中心から
の距離が長く外周に向かって突出する山部成形部が周方
向に沿って交互に設けられた補強部成形部を有する二軸
延伸ブロー成形容器の成形型において、前記補強部成形
部は、環状接地部成形部からの高さの異なる複数位置に
おけるそれぞれの中心軸から山部成形部の頂部と谷部成
形部の頂部との距離差が上方よりも下方で小さく形成さ
れていることを特徴としている。A mold according to a tenth aspect of the present invention is an upper bottom having an annular ground portion molding portion formed at an outer peripheral position and a convex portion molding portion projecting inward from the annular ground portion molding portion toward the center. A mold is provided, and the convex portion molding portion has a valley portion molding portion having a short distance from the center and projecting toward the center and a mountain portion molding portion having a long distance from the center and projecting toward the outer periphery along the circumferential direction. In a mold for a biaxially stretched blow molding container having alternating reinforcing portion molding portions, the reinforcing portion molding portion is a mountain portion from each central axis at a plurality of positions having different heights from the annular ground portion molding portion. It is characterized in that the difference in distance between the top of the forming portion and the top of the valley forming portion is formed smaller in the lower portion than in the upper portion.
【００２２】第１１の発明にかかる成形型は、第１０の
発明に加え、前記凸部成形部に設けられた補強部成形部
は、環状接地部成形部からの高さの異なる複数位置にお
けるそれぞれの中心軸から山部成形部の頂部と谷部成形
部の頂部との距離差が中心から環状接地部へ向かって徐
々に小さく形成され、縦断面で環状接地部成形部から中
心へ向かって滑らかな傾斜を有することを特徴としてい
る。According to an eleventh invention, in addition to the tenth invention, the reinforcing portion molding portion provided in the convex portion molding portion is provided at a plurality of positions at different heights from the annular ground portion molding portion. The difference in distance between the top of the peak forming part and the top of the valley forming part from the center axis of the is gradually formed from the center to the annular grounding part, and in the longitudinal section, it is smooth from the annular grounding part forming part to the center. It is characterized by having a large slope.
【００２３】第１２の発明にかかる成形型は、第１１の
発明に加え、前記凸部成形部に設けられた補強部成形部
は、周方向に沿って形成される段部成形型を有すること
を特徴としている。According to a twelfth aspect of the present invention, in addition to the eleventh aspect of the present invention, the reinforcing section forming section provided on the convex section forming section has a step forming die formed along the circumferential direction. Is characterized by.
【００２４】第１３の発明にかかる成形型は、第１２の
発明に加え、前記段部成形部は、縦断面で環状接地部成
形部からの高さの異なる複数位置に複数設けられてお
り、各段部成形部に設けられた山部成形部と谷部成形部
は、それぞれ中心軸から山部成形部の頂部と谷部成形部
の頂部との距離差が、環状接地部成形部に近い段部成形
部になるにしたがって小さく形成されていることを特徴
としている。According to a thirteenth invention, in addition to the twelfth invention, a plurality of the stepped molding portions are provided at a plurality of positions at different heights from the annular grounding portion molding portion in a longitudinal section, The peak forming part and the valley forming part provided in each step forming part have a difference in distance from the central axis between the top of the peak forming part and the top of the valley forming part that is close to the annular grounding part forming part. It is characterized in that it is formed smaller toward the stepped portion.
【００２５】第１４の発明にかかる成形型は、第１３の
発明に加え、段部成形部は複数設けられており、最外周
位置の段部成形部は円形又は多角形に形成されているこ
とを特徴としている。In addition to the thirteenth invention, the molding die according to the fourteenth invention is provided with a plurality of stepped molding portions, and the stepped molding portion at the outermost peripheral position is formed in a circular or polygonal shape. Is characterized by.
【００２６】[0026]
【作用】前記構成の第１及び第２の発明にあっては、底
部の環状接地部から底部中心にかけて容器内方へ向けて
突出する凸部に、中心からの距離が短く中心に向かって
突出する谷部と中心からの距離が長く外周方向に向かっ
て突出する山部を周面に沿って交互に設けることにより
補強部を形成し、この補強部によって、底部中心の周縁
における面積を増加させ、底部中心周縁での配向度を向
上させて高温内容物の充填時における耐熱性を向上させ
るようにしている。In the first and second inventions having the above-mentioned structure, the convex portion projecting inward from the annular grounding portion at the bottom toward the center of the bottom has a short distance from the center and projects toward the center. Forming a reinforcing portion by alternately providing a valley portion and a mountain portion which is long in distance from the center and protrudes toward the outer peripheral direction along the peripheral surface, and the reinforcing portion increases the area at the peripheral edge of the center of the bottom portion. By improving the degree of orientation at the center edge of the bottom portion, the heat resistance during filling of the high temperature contents is improved.
【００２７】また、環状接地部からの高さが同じ位置に
おける底部中心軸から山部の頂部と谷部の頂部との距離
が底部中心から環状接地部へ向かって徐々に小さく形成
することにより、谷部の頂部の中心側への突出量を小さ
くして谷部の配向度を向上させることにより、山部の頂
部と谷部の頂部の配向度を平均化させ、高温内容物を充
填した場合における底部の耐熱性を確実に向上させるこ
とができる。Further, by forming the distances from the center axis of the bottom to the tops of the ridges and the tops of the valleys at the same height from the center of the ring-shaped ground gradually decreasing from the center of the bottom to the ground-shaped ground. When filling the high temperature contents by averaging the orientation of the top of the valley and the orientation of the top of the valley by increasing the degree of orientation of the valley by reducing the amount of protrusion of the top of the valley toward the center It is possible to reliably improve the heat resistance of the bottom portion of the.
【００２８】これは、異なる高さ位置において底部中心
軸から各山部の頂部と谷部の頂部との距離を等しくする
と、みかけ上では凸部の面積は広くなっているにもかか
わらず、特に、環状接地部近傍においては、従来でもあ
る程度の配向度が得られていた領域だったのが谷部の頂
部が中心に突出する分だけ厚肉になって配向度が低下す
る結果となり、凸部の外周側から中心部にかけての配向
度が向上せず、かえってこの谷部が従来よりも配向度の
極端に低い領域となってしまうため、山部の頂部と谷部
の頂部との距離を底部中心から外周部へ向かって徐々に
小さくすることにより、環状接地部近傍における配向度
の平均化を図ったものである。This is especially true when the distances from the center axis of the bottom to the peaks of the peaks and the peaks of the valleys at the different height positions are equal, although the area of the convex portions is apparently wide. In the vicinity of the ring-shaped grounding part, a region where the degree of orientation was obtained in the past was thicker by the amount that the top of the valley portion protrudes to the center, but the degree of orientation decreases, resulting in the degree of orientation decreasing. Since the degree of orientation from the outer peripheral side to the center does not improve, and this valley becomes an area with an extremely lower degree of orientation than before, the distance between the top of the peak and the top of the valley should be the bottom. The orientation degree in the vicinity of the annular grounding portion is averaged by gradually decreasing from the center toward the outer peripheral portion.
【００２９】第３の発明にあっては、第１の発明の状態
に加え、補強部に縦断面で環状接地部からの高さの同じ
段部を設けることにより、段部が補強部においてリブと
して機能することとなり、底部の強度を向上させて高温
内容物の充填時における底部の変形を防止することがで
きる。According to a third aspect of the invention, in addition to the state of the first aspect of the invention, by providing the reinforcing portion with a step portion having the same height from the annular grounding portion in a longitudinal section, the step portion is ribbed in the reinforcing portion. As a result, it is possible to improve the strength of the bottom portion and prevent the bottom portion from being deformed when the high temperature contents are filled.
【００３０】第４の発明にあっては、第３の発明の状態
に加え、段部を複数設け、各段部に設けられた山部と谷
部を、底部中心軸から山部の頂部と谷部の頂部との距離
が環状接地部に近い段部になるに従って小さく形成する
ことにより、複数の段部をリブとして機能させることが
でき、より一層強度を向上させることができ、凸部の変
形をより確実に防止できるとともに、凸部全体の配向度
を高めることにより、より一層耐熱性を向上させること
ができる。In the fourth invention, in addition to the state of the third invention, a plurality of stepped portions are provided, and the peaks and valleys provided in each stepped portion are formed from the central axis of the bottom portion to the top of the mountain portion. By forming the distance from the top of the trough to be smaller toward the step closer to the annular grounding part, the steps can function as ribs, and the strength can be further improved. The deformation can be more reliably prevented, and the heat resistance can be further improved by increasing the degree of orientation of the entire convex portion.
【００３１】第５の発明にあっては、第３の発明の状態
に加え、最外周位置の段部を円形又は多角形に形成する
ことにより、凸部が内容物の熱や荷重により下方に落ち
て環状接地部から飛び出すのを防止することができる。In the fifth invention, in addition to the state of the third invention, the step portion at the outermost peripheral position is formed in a circular shape or a polygonal shape, so that the convex portion is downwardly moved by heat or load of the contents. It can be prevented from falling and jumping out from the annular grounding portion.
【００３２】第６の発明及び第８の発明にあっては、環
状接地部から容器内方へ上昇傾斜する傾斜面を形成し、
この傾斜面上端に形成される環状段部を円形に形成する
ことにより、傾斜面及び環状段部によりリブ効果を得る
ことができ、強度の向上を図ることができるとともに、
凸部が内容物の熱や荷重により下方に落ちて環状接地部
から飛び出すのを防止することができる。In the sixth invention and the eighth invention, an inclined surface is formed which is inclined upward from the annular grounding portion toward the inside of the container,
By forming the annular step portion formed at the upper end of the inclined surface in a circular shape, a rib effect can be obtained by the inclined surface and the annular step portion, and the strength can be improved,
It is possible to prevent the convex portion from dropping downward from the annular grounding portion due to the heat and load of the contents.
【００３３】第７の発明及び第８の発明にあっては、前
記第６の発明における環状段部を多角形に形成すること
により、第６の発明と同様の効果を奏することができ
る。In the seventh invention and the eighth invention, the same effect as the sixth invention can be obtained by forming the annular step portion in the sixth invention into a polygonal shape.
【００３４】第９の発明にあっては、第６の発明又は第
７の発明の状態に加えて、補強部に縦断面で段部を形成
することにより、リブ効果を得ることができ、凸部の強
度及び配向度を向上させて耐熱性を向上させ、変形を防
止することができる。In the ninth invention, in addition to the state of the sixth invention or the seventh invention, a rib effect can be obtained by forming a stepped portion in the longitudinal section in the reinforcing portion, and the convex portion can be obtained. The strength and orientation of the part can be improved to improve heat resistance and prevent deformation.
【００３５】第１０〜第１４の発明にあっては、底部の
凸部において外周側から中心に向かって配向度を向上さ
せた二軸延伸ブロー成形容器を容易に成形することがで
きる。In the tenth to fourteenth inventions, the biaxially stretched blow molded container in which the degree of orientation is improved from the outer peripheral side toward the center in the convex portion of the bottom can be easily molded.
【００３６】[0036]
【実施例】以下、本発明の好適な実施例について、図面
を参照して詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the drawings.
【００３７】図１〜図３は、本発明の１実施例にかかる
二軸延伸ブロー成形容器を示す図である。図１及び図３
は、図２のIII−III線に沿って底部を断面にして示して
いる。1 to 3 are views showing a biaxially stretch blow molded container according to one embodiment of the present invention. 1 and 3
Shows the bottom portion in section along the line III-III in FIG.
【００３８】この二軸延伸ブロー成形容器２０は、ＰＥ
Ｔを縦軸及び横軸方向に延伸させて容器の形状に成形さ
れ、かつ、耐熱性のある耐熱瓶として形成されたもの
で、ネック部２２、ネック部２２から拡径しつつ下方に
連なるショルダー部２４、ショルダー部２４から下方に
延長された胴部２６、胴部２６から縮径しつつ下方に連
なるヒール部２８及びヒール部２８から連続して容器下
端に位置する底部３０から構成されている。This biaxially stretch blow molded container 20 is made of PE.
A container formed by stretching T in the direction of the vertical axis and the horizontal axis to form a container, and formed as a heat-resistant bottle having heat resistance. A neck portion 22, a shoulder extending downward from the neck portion 22 and extending downward. It is composed of a portion 24, a body portion 26 extending downward from the shoulder portion 24, a heel portion 28 that is reduced in diameter from the body portion 26 and continues to the lower portion, and a bottom portion 30 that is continuous from the heel portion 28 and is located at the lower end of the container. .
【００３９】この二軸延伸ブロー成形容器２０において
は、一般にネック部２２は延伸されずに厚肉になってお
り、胴部２６がもっとも延伸されて薄肉にされ、更に底
部３０が延伸されにくく厚肉の状態となっている。In the biaxially stretched blow molded container 20, the neck portion 22 is generally not stretched and has a thick wall, the body portion 26 is stretched to be the thinnest, and the bottom portion 30 is hard to be stretched. It is in the state of meat.
【００４０】底部３０は、ヒール部２８に連なる外周部
に位置する環状接地部３２と、この環状接地部３２から
底部中心にかけて容器内方へ向けて突出する凸部３４と
から構成される上底形状とされ、環状接地部３２により
自立性が持たせられるようになっている。The bottom portion 30 is composed of an annular grounding portion 32 located on the outer peripheral portion connected to the heel portion 28, and a convex portion 34 projecting inward from the annular grounding portion 32 toward the center of the bottom portion. It has a shape, and the annular grounding portion 32 provides self-supporting property.
【００４１】凸部３４は、中心部３６と、環状接地部３
２と、中心部３６と環状接地部３２との間に位置する補
強部４４とから構成されている。一般に底部３０におい
ては、中心部３６ではほとんど延伸されずに厚肉のまま
となっており、外周部へ行くに従って徐々に配向度が高
められようになっている。そこで配向度の低い中心部３
６近傍の凸部３４を十分に延伸して配向度を高めるため
に、底部３０の凸部３４に補強部４４を形成することに
より、底部３０の耐熱性を向上させるようにしている。The convex portion 34 includes the central portion 36 and the annular grounding portion 3
2 and a reinforcing portion 44 located between the central portion 36 and the annular grounding portion 32. Generally, in the bottom portion 30, the central portion 36 is hardly stretched and remains thick, and the degree of orientation is gradually increased toward the outer peripheral portion. Therefore, the central portion 3 having a low degree of orientation
In order to sufficiently extend the convex portions 34 near 6 to increase the degree of orientation, the reinforcing portions 44 are formed on the convex portions 34 of the bottom portion 30 to improve the heat resistance of the bottom portion 30.
【００４２】すなわち、この補強部４４は、中心に向か
って突出する谷部４０と、外周方向に向かって突出する
山部４２を周面に沿って交互に設けることにより、凸部
３４の面積を拡大し、配向度を高めるようになってい
る。That is, in the reinforcing portion 44, the area of the convex portion 34 is formed by alternately providing the valley portion 40 protruding toward the center and the peak portion 42 protruding toward the outer peripheral direction along the peripheral surface. It is designed to be enlarged and have a higher degree of orientation.
【００４３】具体的には、谷部４０は、環状接地部３２
からの高さが異なる複数の位置において、それぞれ高い
位置から順次低い位置にかけて、底部中心軸４６からの
距離が各々ｌ1＜ｌ2＜ｌ3と長くなるように設定されて
いる。また、山部４２は、同様に、それぞれ高い位置か
ら順次低い位置にかけて、底部中心軸４６からの距離が
各々Ｌ1＜Ｌ2＜Ｌ3と長くなるように設定されている。
これら各谷部４０及び山部４２の底部中心軸４６からの
距離は、Ｌ1＞ｌ1，Ｌ2＞ｌ2，Ｌ3＞ｌ3と山部４２に対
して谷部４０が短く設定されている。Specifically, the trough portion 40 is the annular grounding portion 32.
At a plurality of positions having different heights from the bottom center axis 46, the distances from the bottom central axis 46 are set to be long, i 1 <l 2 <l 3 , respectively. Similarly, the ridges 42 are set such that the distances from the bottom central axis 46 are each longer as L 1 <L 2 <L 3 from higher positions to lower positions.
The distance from the center axis 46 of the bottom of each of the valleys 40 and the peaks 42 is set to be L 1 > l 1 , L 2 > l 2 , L 3 > l 3 and the valleys 40 are set shorter than the peaks 42. ing.
【００４４】ところで、この補強部４４において、環状
接地部３２からの高さが異なる複数の位置における底部
中心軸４６から山部４２の頂部と、谷部４０との頂部と
の距離差を上下位置においてそれぞれ等しく形成した場
合、すなわち、Ｌ1−ｌ1＝Ｌ2−ｌ2＝Ｌ3−ｌ3とした場
合には、見かけ上凸部３４の面積が拡大しているにもか
かわらず、環状接地部３２に近接した谷部４０において
は、従来よりも十分に延伸されず、配向度の低い厚肉の
状態となり、耐熱性が向上しておらず、谷部４０を形成
することで、環状接地部３２近傍ではマイナスに作用す
ることとなるものであった。By the way, in the reinforcing portion 44, the difference in distance between the top of the peak portion 42 and the top of the valley portion 40 from the bottom central axis 46 at a plurality of positions having different heights from the annular grounding portion 32 is adjusted to the vertical position. If it is equally formed in, i.e., L1 - when the l 1 = L 2 -l 2 = L 3 -l 3 , despite the apparent area of the convex portion 34 is expanded, the annular ground In the valley portion 40 close to the portion 32, the valley portion 40 is not sufficiently stretched as compared with the conventional one, becomes a thick state with a low degree of orientation, and the heat resistance is not improved. In the vicinity of the portion 32, it has a negative effect.
【００４５】そこで、補強部４４において、環状接地部
３２からの高さの異なる上下複数位置におけるそれぞれ
の底部中心軸４６から山部４２の頂部と谷部４０の頂部
との距離の差を、Ｌ1−ｌ1＞Ｌ2−ｌ2＞Ｌ3−ｌ3となる
よう、底部中心から環状接地部３２へ向かって徐々に小
さく形成している。このように、谷部４０の頂部を十分
に延伸されている環状接地部３２側に近づけることによ
り、谷部４０の頂部における延伸度を増大させ、配向度
を高めることができ、これにより底部３０の耐熱性を向
上させるようにしている。Therefore, in the reinforcing portion 44, the difference in distance between the top of the peak portion 42 and the top of the valley portion 40 from the respective bottom center axes 46 at a plurality of upper and lower positions different from the annular grounding portion 32 is L. 1 -l 1> L 2 -l 2 > L 3 -l 3 and so as, is gradually formed small toward the bottom center to the annular ground portion 32. In this way, by bringing the top of the valley portion 40 closer to the fully extended annular grounding portion 32 side, the degree of stretching at the top of the valley portion 40 can be increased and the degree of orientation can be increased, whereby the bottom portion 30. I try to improve the heat resistance of.
【００４６】更に、凸部３４に設けられた補強部４４に
は、縦断面で環状接地部３２からの高さの異なる複数の
段部４８ａ，４８ｂ，４８ｃが等高線上で周方向に沿っ
て複数形成され、これら複数の段部４８ａ，４８ｂ，４
８ｃを補強部４４における環状のリブとして機能させる
ようにしている。これにより、より一層凸部３４の配向
度を向上させるとともに、底部３０の強度をより一層向
上させ、加熱殺菌による高温の内容物を充填する際にお
ける底部３０の変形を確実に防止できるようにしてい
る。Further, in the reinforcing portion 44 provided on the convex portion 34, a plurality of step portions 48a, 48b, 48c having different heights from the annular grounding portion 32 in a longitudinal section are provided along the circumferential direction on the contour line. And a plurality of steps 48a, 48b, 4 are formed.
8c is made to function as an annular rib in the reinforcing portion 44. Thereby, the degree of orientation of the convex portions 34 is further improved, the strength of the bottom portion 30 is further improved, and the deformation of the bottom portion 30 at the time of filling the high temperature contents due to heat sterilization can be reliably prevented. There is.
【００４７】また、各段部４８ａ，４８ｂ，４８ｃに設
けられた山部５０ａ，５０ｂ，５０ｃ、と谷部５２ａ，
５２ｂ，５２ｃは、底部中心軸４６から山部５０ａ，５
０ｂ，５０ｃの頂部と谷部５２ａ，５２ｂ，５２ｃの頂
部との距離差Ｌ1−ｌ1，Ｌ2−ｌ2，Ｌ3−ｌ3が環状接地
部３２に近い段部４８ｂ，４８ｃになるに従って小さく
形成している。これにより、谷部５２ａ，５２ｂ，５２
ｃの頂部付近の配向度を向上させてより一層耐熱性を向
上させるようにしている。Further, the crests 50a, 50b, 50c and the troughs 52a, which are provided on the stepped portions 48a, 48b, 48c, respectively.
52b and 52c are the peaks 50a and 5 from the central axis 46 of the bottom.
Distance differences L 1 -l 1 , L 2 -l 2 and L 3 -l 3 between the peaks of 0b, 50c and the peaks of valleys 52a, 52b, 52c become steps 48b, 48c close to the annular ground 32. It is formed small according to. Thereby, the valleys 52a, 52b, 52
The degree of orientation near the top portion of c is improved to further improve heat resistance.
【００４８】そして更に、凸部３４と環状接地部３２と
の境界部においては、環状接地部３２から容器内方へ上
昇傾斜する傾斜面５４と、この傾斜面５４の上端に接続
する環状平面部５６が形成され、この環状平面部５６と
傾斜面５４を接続する環状段部５８が円形に形成されて
いる。この環状段部５８が環状のリブとして機能するこ
とにより、底部３０外周部付近の強度を向上させるとと
もに、内容物の熱や荷重により、凸部３４が下方に落
ち、環状接地部３２より飛び出すのを防止できるように
している。Furthermore, at the boundary between the convex portion 34 and the annular grounding portion 32, an inclined surface 54 that is inclined upward from the annular grounding portion 32 toward the inside of the container, and an annular flat surface portion connected to the upper end of the inclined surface 54. 56 is formed, and an annular step portion 58 that connects the annular flat surface portion 56 and the inclined surface 54 is formed in a circular shape. The annular step portion 58 functions as an annular rib to improve the strength in the vicinity of the outer periphery of the bottom portion 30, and the heat and the load of the contents cause the convex portion 34 to drop downward and protrude from the annular ground portion 32. To prevent this.
【００４９】また、本実施例においては各山部５０ａ，
５０ｂ，５０ｃの頂部と、谷部５２ａ，５２ｂ，５２ｃ
の頂部が角張った状態となっており、かつその頂部が放
射方向に一致するようになっているため、内容物による
上方からの荷重に対して強い状態となり、凸部３４の下
方への落下を防止するのに役立つものである。Further, in this embodiment, each mountain portion 50a,
Tops of 50b and 50c and valleys 52a, 52b and 52c
Since the top part of the is angular and the top part is aligned with the radial direction, it is strong against the load from above by the contents, and the convex part 34 does not fall downward. It helps prevent it.
【００５０】図４においては、前記二軸延伸ブロー成形
容器の成形型を示している。FIG. 4 shows a mold for the biaxially stretched blow molding container.
【００５１】この成形型は、ブローキャビティ型６０
と、底部３０成型用の上底型６２とから構成されてい
る。This mold is a blow cavity mold 60.
And an upper bottom mold 62 for molding the bottom portion 30.
【００５２】上底型６２は、外周位置に形成された環状
接地部成形部１３２と、この環状接地部成形部１３２か
ら中心にかけて容器内方へ突出する凸部成形部１３４と
を有する。The upper bottom mold 62 has an annular grounding portion molding portion 132 formed at an outer peripheral position and a convex portion molding portion 134 projecting inward from the annular grounding portion molding portion 132 toward the center.
【００５３】凸部成形部１３４は中心軸１４６からの距
離が短く中心に向かって突出する谷部成形部１４０と、
中心軸１４６からの距離が長く外周に向かって突出する
山部成形部１４２が周方向に沿って交互に設けられた補
強部成形部１４４を有する。補強部成形部１４４は、環
状接地部成形部１３２からの高さの異なる複数位置にお
けるそれぞれの中心軸１４６から山部成形部の頂部と谷
部成形部の頂部との距離差が上方よりも下方で小さく形
成されている。The convex portion forming portion 134 has a valley portion forming portion 140 which is short in distance from the central axis 146 and protrudes toward the center.
The mountain portion forming portions 142 that are long from the central axis 146 and project toward the outer periphery have the reinforcing portion forming portions 144 that are alternately provided along the circumferential direction. In the reinforcing portion molding portion 144, the distance difference between the tops of the mountain portion molding portion and the valley portion molding portion from the respective central axes 146 at a plurality of positions having different heights from the annular grounding portion molding portion 132 is lower than the upper portion. Is small in size.
【００５４】また、補強部成形部１４４には、縦断面で
環状接地部成形部１３２からの高さの異なる複数位置に
複数の段部形成部１４８ａ，１４８ｂ，１４８ｃが設け
られている。各段部成形部１４８ａ，１４８ｂ，１４８
ｃに設けられた山部成形部１４２と谷部成形部１４０
は、それぞれ中心軸１４６から山部成形部１４２の頂部
と谷部成形部１４０の頂部との距離差がＬ1−ｌ1＞Ｌ2
−ｌ2＞Ｌ3−ｌ3環状接地部成形部１３２に近い段部成
形部１４８ｂ，１４８ｃになるにしたがって小さく形成
されている。Further, the reinforcing portion molding portion 144 is provided with a plurality of step portion forming portions 148a, 148b, 148c at a plurality of positions having different heights from the annular grounding portion molding portion 132 in the vertical cross section. Step forming parts 148a, 148b, 148
c forming part 142 and trough forming part 140 provided in c
Is the distance difference from the central axis 146 to the top of the peak forming portion 142 and the top of the valley forming portion 140, respectively, L 1 −l 1 > L 2
-L 2 > L 3 -l 3 It is formed so as to become smaller as the step forming portions 148 b and 148 c closer to the annular grounding portion forming portion 132.
【００５５】更に、凸部成形部１３４と環状接地部成形
部１３２との境界部には、環状接地部成形部１３２から
上昇傾斜する傾斜面成形部１５４と、この傾斜面成形部
１５４の上端に接続する環状平面部１５６と傾斜面成形
部１５４を接続する環状段部成形部１５８が円形に形成
されている。Further, at the boundary between the convex molding portion 134 and the annular grounding portion molding portion 132, there is formed an inclined surface molding portion 154 which is inclined upward from the annular grounding portion molding portion 132, and an upper end of the inclined surface molding portion 154. An annular flat portion 156 for connecting and an annular step forming portion 158 for connecting the inclined surface forming portion 154 are formed in a circular shape.
【００５６】図５は、本発明の他の実施例にかかる二軸
延伸ブロー成形容器を示す図である。FIG. 5 is a view showing a biaxially stretch blow molded container according to another embodiment of the present invention.
【００５７】この実施例では、底部６４の凸部６６に、
補強部７２を形成している。In this embodiment, the convex portion 66 of the bottom 64 is
The reinforcing portion 72 is formed.
【００５８】この補強部７２は、縦断面で環状接地部３
２から底部中心へ向かって滑らかな傾斜を有する状態
で、中心に向かって突出する谷部６８と、外周方向に向
かって突出する山部７０を周面に沿って交互に設けるこ
とにより、凸部６６の面積を拡大し、配向度を高めるよ
うになっている。The reinforcing portion 72 has a vertical cross-section and is an annular grounding portion 3.
In the state where there is a smooth slope from 2 to the center of the bottom portion, the convex portion is provided by alternately providing the valley portion 68 projecting toward the center and the mountain portion 70 projecting toward the outer peripheral direction along the peripheral surface. The area of 66 is enlarged and the degree of orientation is increased.
【００５９】具体的には、谷部６８は、環状接地部３２
からの高さが異なる複数の位置において、それぞれ高い
位置から順次低い位置にかけて、図中の等高線で示すよ
うに、中心からの距離が各々ｌ1，ｌ2，ｌ3と長くなる
ように設定されている。また、山部７０は、同様に、そ
れぞれ高い位置から順次低い位置にかけて、中心からの
距離が各々Ｌ1，Ｌ2，Ｌ3と長くなるように設定されて
いる。これら各谷部６８及び山部７０の中心からの距離
は、Ｌ1＞ｌ1，Ｌ2＞ｌ2，Ｌ3＞ｌ3と山部４２に対して
谷部４０が短く設定されている。更に、各高さ位置にお
ける山部４２と谷部４０との距離差は、Ｌ1−ｌ1＞Ｌ2
−ｌ2＞Ｌ3−ｌ3と環状接地部３２に近くなるに従って
小さく形成されている。Specifically, the valley portion 68 is the annular grounding portion 32.
At a plurality of positions having different heights from the center, the distance from the center is set to be long as l 1 , l 2 , and l 3 from the high position to the low position, respectively, as shown by the contour lines in the figure. ing. Similarly, the crests 70 are set so that the distances from the center become longer as L 1 , L 2 , and L 3 respectively from the higher position to the lower position. The distances from the centers of the valleys 68 and the peaks 70 are set so that the valleys 40 are shorter than the peaks 42 with L 1 > l 1 , L 2 > l 2 , and L 3 > l 3 . Furthermore, the distance difference between the peak portion 42 and the valley portion 40 at each height position is L 1 −l 1 > L 2
-L 2 > L 3 -l 3 and the smaller the ring ground portion 32, the smaller the diameter.
【００６０】このように、縦断面において環状接地部３
２から底部中心へ向かって滑らかな傾斜を有する状態と
され、段部が形成されていない状態であっても、凸部６
６が補強部７２により十分に配向度が高められているこ
とから、凸部６６が外周部から中心部に向かうにつれて
配向度が向上されることとなり、底部６４の耐熱性は十
分に確保できるものである。Thus, in the vertical cross section, the annular grounding portion 3
2 has a smooth slope from the bottom to the center of the bottom, and even if no step is formed, the protrusion 6
Since the degree of orientation of 6 is sufficiently increased by the reinforcing portion 72, the degree of orientation is improved as the convex portion 66 goes from the outer peripheral portion toward the central portion, and the heat resistance of the bottom portion 64 can be sufficiently ensured. Is.
【００６１】また、環状接地部３２と凸部６６との間に
は、環状接地部３２から容器内方へ上昇傾斜する傾斜面
５４の上端に接続して補強部７２が形成され、この補強
部７２と傾斜面５４を接続する環状段部７３が形成さ
れ、この環状段部７３がリブとして機能するようにされ
ている。A reinforcing portion 72 is formed between the annular grounding portion 32 and the convex portion 66 so as to be connected to the upper end of the inclined surface 54 that is inclined upward from the annular grounding portion 32 toward the inside of the container. An annular stepped portion 73 that connects 72 and the inclined surface 54 is formed, and this annular stepped portion 73 functions as a rib.
【００６２】他の構成及び作用は前記実施例と同様につ
き説明を省略する。The rest of the configuration and operation are the same as in the above-mentioned embodiment, so a description thereof will be omitted.
【００６３】図６及び図７は、本発明の更に他の実施例
にかかる二軸延伸ブロー成形容器を示す図である。6 and 7 are views showing a biaxially stretch blow-molded container according to still another embodiment of the present invention.
【００６４】この実施例では、図１〜図３の実施例にお
いて３つの環状段部４８ａ，４８ｂ，４８ｃを形成して
いるのに対し、２つの環状段部７４ａ，７４ｂから構成
されている点で相違している。In this embodiment, three annular steps 48a, 48b, 48c are formed in the embodiment of FIGS. 1 to 3, but two annular steps 74a, 74b are formed. It is different.
【００６５】このように、環状段部７４ａ，７４ｂの数
を減少させても、十分な配向度が得られ、耐熱性は十分
に向上させることができる。また、環状段部７４ａ，７
４ｂがリブとして機能するため底部７６の強度も向上す
ることとなる。As described above, even if the number of the annular step portions 74a and 74b is reduced, a sufficient degree of orientation can be obtained and the heat resistance can be sufficiently improved. Also, the annular step portions 74a, 7
Since 4b functions as a rib, the strength of the bottom portion 76 is also improved.
【００６６】図８は、本発明の更に他の実施例を示す図
である。FIG. 8 is a diagram showing still another embodiment of the present invention.
【００６７】この実施例では、底部７８を構成する凸部
８０の中央部付近に１つの段部８２を形成し、環状接地
部３２に近接した位置に、円形に近い多角形の段部８４
を形成するようにしている。In this embodiment, one step portion 82 is formed near the central portion of the convex portion 80 which constitutes the bottom portion 78, and a polygonal step portion 84 having a shape close to a circle is formed at a position close to the annular grounding portion 32.
To form.
【００６８】このように、環状接地部３２に近い環状段
部８４を円に近い多角形に形成することによっても、こ
の環状段部８４がリブとしての機能を果たすこととなる
ため、底部７８の強度を向上させ、かつ、高温の内容物
の熱や荷重による凸部８０が下方に落ち、環状接地部３
２より飛び出すのを防止することができる。また、凸部
８０は、補強部８６によって配向度は向上されているた
め、耐熱性は確実に向上することとなり、しかも段部８
２もリブとしての機能を果たすことから、十分な強度を
有することとなる。By forming the annular stepped portion 84 near the annular grounding portion 32 into a polygonal shape close to a circle as described above, the annular stepped portion 84 also functions as a rib, so that the bottom portion 78 of the bottom portion 78 is formed. In addition to improving the strength, the convex portion 80 due to the heat and load of the high-temperature contents drops downward, and the annular grounding portion 3
2 can be prevented from jumping out. Further, since the degree of orientation of the convex portion 80 is improved by the reinforcing portion 86, the heat resistance is surely improved, and moreover, the step portion 8 is provided.
Since 2 also functions as a rib, it has sufficient strength.
【００６９】本発明は、前記各実施例に限定されるもの
ではなく、本発明の要旨の範囲内において種々の変形実
施が可能である。The present invention is not limited to the above embodiments, but various modifications can be made within the scope of the present invention.
【００７０】図１〜図３に示す実施例、図５に示す実施
例及び図６及び図７に示す実施例においては、凸部と環
状接地部との間における傾斜面と環状平面部を接続する
環状段部が円形に形成されているが、この例に限らず、
環状段部を多角形に形成することも可能である。In the embodiment shown in FIGS. 1 to 3, the embodiment shown in FIG. 5 and the embodiments shown in FIGS. 6 and 7, the inclined surface and the annular flat surface portion are connected between the convex portion and the annular grounding portion. The annular step portion to be formed is circular, but is not limited to this example,
It is also possible to form the annular step in a polygonal shape.
【００７１】また、段部の形状も前記各実施例に限定さ
れるものではなく、種々の形状とすることが可能であ
る。Further, the shape of the stepped portion is not limited to the above-mentioned embodiments, and various shapes can be adopted.
【００７２】更に、最外周位置の段部を円又は多角形と
することも可能である。Further, it is possible to make the step portion at the outermost peripheral position a circle or a polygon.
【００７３】また、上底型は、補強部成形部に複数の段
部成形部を有する場合を示したが、この例に限らず、段
部成形部は単数でも良く、あるいは段部成形部が形成さ
れておらず滑らかに傾斜する場合にも適用し得る。Further, although the upper bottom mold has shown the case where the reinforcing part forming part has a plurality of step forming parts, the present invention is not limited to this example, and a single step forming part may be used, or the step forming part may be formed. It can also be applied to the case where it is not formed and is smoothly inclined.
【００７４】[0074]
【発明の効果】前記構成の第１及び第２の発明によれ
ば、底部の環状接地部から底部中心にかけて容器内方へ
向けて突出する凸部に、中心からの距離が短く中心に向
かって突出する谷部と中心からの距離が長く外周方向に
向かって突出する山部を周面に沿って交互に設けること
により補強部を形成し、この補強部によって、底部中心
の周縁における面積を増加させ、底部中心周縁での配向
度を向上させて高温内容物の充填時おける耐熱性を向上
させ、かつ、環状接地部からの高さが同じ位置における
底部中心軸から山部の頂部と谷部の頂部との距離が底部
中心から環状接地部へ向かって徐々に小さく形成するこ
とにより、谷部の頂部の中心側への突出量を小さくして
谷部の配向度を向上させることにより、山部の頂部と谷
部の頂部の配向度を平均化させ、高温内容物を充填した
場合における底部の耐熱性を確実に向上させることがで
きるという効果がある。According to the first and second aspects of the present invention, the convex portion projecting inward from the annular grounding portion at the bottom to the center of the bottom has a short distance from the center toward the center. Reinforcement is formed by alternately providing protruding valleys and peaks that have a long distance from the center and project toward the outer peripheral direction along the peripheral surface.The reinforcements increase the area at the periphery of the center of the bottom. And improves the degree of orientation at the center of the bottom to improve the heat resistance during filling of high temperature contents, and at the same height from the annular grounding part, from the center axis of the bottom to the top and valley of the peak. By gradually forming the distance from the center of the bottom toward the ring-shaped grounding part of the bottom part, the amount of protrusion of the valley part toward the center side of the top part is reduced and the degree of orientation of the valley part is improved. The degree of orientation of the top of the ridge and the top of the valley Is disproportionation, there is an effect that the heat resistance of the bottom portion can be improved reliably in the case filled with hot contents.
【００７５】第３の発明によれば、第１の発明の状態に
加え、補強部に縦断面で環状接地部からの高さの同じ段
部を設けることにより、段部が補強部においてリブとし
て機能することとなり、底部の強度を向上させて高温内
容物の充填時における底部の変形を防止することができ
るという効果がある。According to the third invention, in addition to the state of the first invention, by providing the reinforcing portion with a step portion having the same height from the annular grounding portion in the longitudinal section, the step portion serves as a rib in the reinforcing portion. This has the effect of improving the strength of the bottom portion and preventing the bottom portion from being deformed when the high temperature contents are filled.
【００７６】第４の発明によれば、第３の発明の状態に
加え、段部を複数設け、各段部に設けられた山部と谷部
を、底部中心軸から山部の頂部と谷部の頂部との距離が
環状接地部に近い段部になるに従って小さく形成するこ
とにより、複数の段部をリブとして機能させることがで
き、より一層強度を向上させることができ、凸部の変形
をより確実に防止できるとともに、凸部全体の配向度を
高めることにより、より一層耐熱性を向上させることが
できるという効果がある。According to the fourth invention, in addition to the state of the third invention, a plurality of step portions are provided, and the peaks and troughs provided in each step are separated from the central axis of the bottom to the peaks and troughs of the peaks. By forming the distance from the top of the portion to the step closer to the annular grounding portion, the plurality of steps can function as ribs, the strength can be further improved, and the deformation of the convex portion can be improved. It is possible to more reliably prevent the above phenomenon, and it is possible to further improve the heat resistance by increasing the degree of orientation of the entire convex portion.
【００７７】第５の発明によれば、第３の発明の状態に
加え、最外周位置の段部を円形又は多角形に形成するこ
とにより、凸部が内容物の熱や荷重により下方に落ちて
環状接地部から飛び出すのを防止することができるとい
う効果がある。According to the fifth aspect of the invention, in addition to the state of the third aspect of the invention, the step portion at the outermost peripheral position is formed into a circular shape or a polygonal shape, so that the convex portion falls downward due to heat or load of the contents. Therefore, there is an effect that it can be prevented from jumping out of the annular grounding portion.
【００７８】第６の発明及び第８の発明によれば、環状
接地部から容器内方へ上昇傾斜する傾斜面に形成し、こ
の傾斜面上端に形成される環状段部を円形に形成するこ
とにより、傾斜面及び環状段部によりリブ効果を得るこ
とができ、強度の向上を図ることができるとともに、凸
部が内容物の熱や荷重により下方に落ちて環状接地部か
ら飛び出すのを防止することができるという効果があ
る。According to the sixth invention and the eighth invention, the inclined surface is formed so as to incline upward from the annular grounding portion toward the inside of the container, and the annular stepped portion formed at the upper end of the inclined surface is formed in a circular shape. By this, the rib effect can be obtained by the inclined surface and the annular step portion, the strength can be improved, and the convex portion can be prevented from dropping downward due to heat or load of the contents and jumping out from the annular ground portion. The effect is that you can.
【００７９】第７の発明及び第８の発明によれば、前記
第６の発明における環状段部を多角形に形成することに
より、第６の発明と同様の効果を奏することができる。According to the seventh invention and the eighth invention, the same effect as that of the sixth invention can be obtained by forming the annular step portion of the sixth invention into a polygonal shape.
【００８０】第９の発明によれば、第６の発明又は第７
の発明の状態に加えて、補強部に縦断面で段部を形成す
ることにより、リブ効果を得ることができ、凸部の強度
及び延伸度を向上させて耐熱性を向上させ、変形を防止
することができるという効果がある。According to the ninth invention, the sixth invention or the seventh invention
In addition to the state of the invention described above, a rib effect can be obtained by forming a stepped portion in a longitudinal section in the reinforcing portion, improving the strength and stretching degree of the convex portion to improve heat resistance and prevent deformation. There is an effect that can be done.
【００８１】第１０〜第１４の発明にあっては、底部の
凸部が外周側から中心に向かって配向度を向上させた二
軸延伸ブロー成形容器を容易に成形することができると
いう効果がある。In the tenth to fourteenth inventions, it is possible to easily form a biaxially stretched blow-molded container in which the convex portion at the bottom has an improved degree of orientation from the outer peripheral side toward the center. is there.
【００８２】[0082]
【図１】本発明の１実施例にかかる二軸延伸ブロー成形
容器の底部を破断にして示す全体正面図である。FIG. 1 is an overall front view showing a bottom portion of a biaxially stretched blow-molded container according to an embodiment of the present invention with the bottom portion cut away.
【図２】図１の底部の底面図である。FIG. 2 is a bottom view of the bottom of FIG.
【図３】図２のIII−III線に沿うブロー成形時における
底部の断面図である。3 is a cross-sectional view of the bottom portion during blow molding taken along line III-III in FIG.
【図４】図１〜図３の底部を成形するための上底型を示
す断面図である。FIG. 4 is a cross-sectional view showing an upper bottom mold for molding the bottom portion of FIGS. 1 to 3.
【図５】本発明の他の実施例にかかる二軸延伸ブロー成
形容器の底部の状態をその底面図及び断面図を組み合わ
せて示す説明図である。FIG. 5 is an explanatory view showing a state of a bottom portion of a biaxially stretch blow-molded container according to another embodiment of the present invention, in which a bottom view and a sectional view thereof are combined.
【図６】本発明の更に他の実施例にかかる二軸延伸ブロ
ー成形容器の底面図でみある。FIG. 6 is a bottom view of a biaxially stretch blow-molded container according to still another embodiment of the present invention.
【図７】図５のVI−VI線に沿う断面図である。7 is a sectional view taken along line VI-VI in FIG.
【図８】本発明の更に他の実施例にかかる二軸延伸ブロ
ー成形容器の底部を示す底面図である。FIG. 8 is a bottom view showing the bottom of the biaxially stretch blow molded container according to still another embodiment of the present invention.
【図９】従来の二軸延伸ブロー成形容器の底部の状態を
その底面図、断面図及び延伸倍率を示すグラフを組み合
わせて示す説明図である。FIG. 9 is an explanatory view showing a state of a bottom portion of a conventional biaxially stretch blow-molded container in combination with a bottom view, a cross-sectional view, and a graph showing a stretching ratio.
２０ 二軸延伸ブロー成形容器 ２６ 胴部 ３０，３４，７６，７８ 底部 ３２ 環状接地部 ３４，６６，８０ 凸部 ４０，６８ 谷部 ４２，７０ 山部 ４４，７２，８６ 補強部 ４６ 底部中心軸 ４８ａ，４８ｂ，４８ｃ，５８，７４ａ，７４ｂ，８
２，８４ 環状段部 ５０ａ，５０ｂ，５０ｃ 山部 ５２ａ，５２ｂ，５２ｃ 谷部 ５４ 傾斜面 ５６ 環状平面部 ６２ 上底型 １３２ 環状接地部成形部 １３４ 凸部成形部 １４０ 谷部成形部 １４２ 山部成形部 １４４ 補強部成形部20 Biaxial Stretch Blow Molding Container 26 Body 30, 30, 34, 76, 78 Bottom 32 Annular Grounding Part 34, 66, 80 Convex 40, 68 Valley 42, 70 Mountain 44, 72, 86 Reinforcement 46 Bottom Central Axis 48a, 48b, 48c, 58, 74a, 74b, 8
2,84 Annular steps 50a, 50b, 50c Mountains 52a, 52b, 52c Valleys 54 Slopes 56 Annular flats 62 Upper bottom mold 132 Annular grounding parts moldings 134 Convex moldings 140 Valley moldings 142 Mountains Molding part 144 Reinforcing part Molding part
Claims (14)
にかけて容器内方へ向けて突出する凸部を有し、 前記凸部は、中心からの距離が短く中心に向かって突出
する谷部と中心からの距離が長く外周方向に向かって突
出する山部が周方向に沿って交互に設けられた補強部を
有する二軸延伸ブロー成形容器において、 前記補強部は、環状接地部からの高さの異なる複数位置
におけるそれぞれの底部中心軸から山部の頂部と谷部の
頂部との距離差が、上方よりも下方で小さく形成されて
いることを特徴とする二軸延伸ブロー成形容器。1. A biaxially stretched thin body portion and a bottom portion provided at a lower end of the body portion, wherein the bottom portion is an annular grounding portion and an inward of the container from the annular grounding portion to the center of the bottom portion. A convex portion that projects toward the center, and the convex portion has a valley portion that is short in distance from the center and protrudes toward the center, and a mountain portion that is long in the distance from the center and protrudes in the outer circumferential direction along the circumferential direction. In a biaxially stretched blow-molded container having reinforcing portions provided alternately, the reinforcing portion is a top portion of a mountain portion and a top portion of a valley portion from respective bottom center axes at a plurality of positions having different heights from an annular grounding portion. A biaxially stretched blow-molded container characterized in that the distance difference between the biaxially stretched blow-molded container and the lower part is smaller than the upper part.
の異なる複数位置におけるそれぞれの底部中心軸から山
部の頂部と谷部の頂部との距離差が底部中心から環状接
地部へ向かって徐々に小さく形成され、縦断面で環状接
地部から底部中心へ向かって滑らかな傾斜を有すること
を特徴とする二軸延伸ブロー成形容器。2. The reinforcing portion provided on the convex portion according to claim 1, comprising a top portion of a mountain portion and a top portion of a valley portion from respective bottom center axes at a plurality of positions having different heights from the annular grounding portion. A biaxial stretch blow-molded container characterized in that the distance difference is gradually reduced from the center of the bottom toward the center of the bottom, and has a smooth slope in a longitudinal section from the center of the center of the bottom toward the center of the bottom.
れた段部を有することを特徴とする二軸延伸ブロー成形
容器。3. The biaxially stretch blow-molded container according to claim 1, wherein the reinforcing portion provided on the convex portion has a step portion formed along the circumferential direction.
数位置に複数設けられており、 各段部に設けられた山部と谷部は、それぞれ底部中心軸
から山部の頂部と谷部の頂部との距離差が、環状接地部
に近い段部になるにしたがって小さく形成されているこ
とを特徴とする二軸延伸ブロー成形容器。4. The step portion according to claim 3, wherein a plurality of the step portions are provided at a plurality of positions having different heights from the annular grounding portion in a vertical cross section, and the mountain portion and the valley portion provided in each step portion are: A biaxial stretch blow-molded container, characterized in that the difference in distance between the top of the peak and the top of the valley from the central axis of the bottom is smaller toward the step closer to the annular grounding portion.
は多角形に形成されていることを特徴とする二軸延伸ブ
ロー成形容器。5. The biaxial stretch blow-molded container according to claim 3, wherein a plurality of step portions are provided, and the step portion at the outermost peripheral position is formed in a circular shape or a polygonal shape.
にかけて容器内方へ向けて突出する凸部を有し、 前記凸部は、中心からの距離が短く中心に向かって突出
する谷部と、中心からの距離が長く外周方向に向かって
突出する山部が周方向に沿って交互に設けられた補強部
を有する二軸延伸ブロー成形容器において、 前記凸部は、環状接地部から容器内方へ上昇傾斜する傾
斜面と、この傾斜面の上端に形成される環状段部とを備
え、 前記環状段部が円形に形成されていることを特徴とする
二軸延伸ブロー成形容器。6. A biaxially stretched thin body portion and a bottom portion provided at a lower end of the body portion, the bottom portion being an annular grounding portion and an inward direction of the container from the annular grounding portion to the center of the bottom portion. There is a convex portion projecting toward, the convex portion is a valley portion having a short distance from the center and projecting toward the center, and a mountain portion having a long distance from the center and projecting toward the outer circumferential direction in the circumferential direction. In a biaxially stretched blow-molded container having reinforcing portions provided alternately along the convex portion, the convex portion is an inclined surface that is inclined upward from the annular grounding portion toward the inside of the container, and an annular step formed at the upper end of the inclined surface. A biaxially stretched blow-molded container, wherein the annular step portion is formed in a circular shape.
にかけて容器内方へ向けて突出する凸部を有し、 前記凸部は、中心からの距離が短く中心に向かって突出
する谷部と、中心からの距離が長く外周方向に向かって
突出する山部が周方向に沿って交互に設けられた補強部
を有する二軸延伸ブロー成形容器において、 前記凸部は、環状接地部から容器内方へ上昇傾斜する傾
斜面と、該傾斜面の上端に形成される環状段部とを備
え、 前記環状段部が多角形に形成されていることを特徴とす
る二軸延伸ブロー成形容器。7. A biaxially stretched thin body portion and a bottom portion provided at a lower end of the body portion, wherein the bottom portion is an annular grounding portion and is directed inward from the annular grounding portion toward the center of the bottom portion. A convex portion projecting toward the center, and a convex portion projecting toward the center with a short distance from the center and a convex portion projecting toward the outer periphery with a long distance from the center along the circumferential direction. In a biaxially stretched blow-molded container having reinforcing portions alternately provided, the convex portion is an inclined surface that is inclined upward from the annular grounding portion toward the inside of the container, and an annular step portion formed at the upper end of the inclined surface. The biaxially stretch blow-molded container, wherein the annular stepped portion is formed in a polygonal shape.
地部から底部中心へ向かって滑らかな傾斜を有すること
を特徴とする二軸延伸ブロー成形容器。8. The biaxial shaft according to claim 6, wherein the reinforcing portion provided on the convex portion has a valley portion having a vertical surface and a smooth slope from the annular ground portion toward the center of the bottom portion. Stretch blow molded container.
れた段部を有することを特徴とする二軸延伸ブロー成形
容器。9. The biaxial stretch blow-molded container according to claim 6, wherein the reinforcing portion provided on the convex portion has a step portion formed along the circumferential direction.
部と、 この環状接地部成形部から中心にかけて容器内方へ突出
する凸部成形部とを有する上底型を備え、 前記凸部成形部は、中心からの距離が短く中心に向かっ
て突出する谷部成形部と中心からの距離が長く外周に向
かって突出する山部成形部が周方向に沿って交互に設け
られた補強部成形部を有する二軸延伸ブロー成形容器の
成形型において、 前記補強部成形部は、環状接地部成形部からの高さの異
なる複数位置におけるそれぞれの中心軸から山部成形部
の頂部と谷部成形部の頂部との距離差が上方よりも下方
で小さく形成されていることを特徴とする二軸延伸ブロ
ー成形容器の成形型。10. An upper bottom mold having an annular grounding portion molding portion formed at an outer peripheral position, and a convexity molding portion projecting inward from the annular grounding portion molding portion to the center of the container. The part is a reinforcing part formed by alternately forming along the circumferential direction a valley forming part having a short distance from the center and protruding toward the center and a mountain forming part having a long distance from the center and protruding toward the outer periphery. In a molding die for a biaxially stretched blow molding container having a portion, the reinforcing portion molding portion is a top portion and a valley portion of the mountain portion molding portion from respective central axes at a plurality of positions having different heights from the annular ground portion molding portion. A molding die for a biaxially stretched blow molding container, characterized in that a difference in distance from the top of each part is formed to be smaller in the lower portion than in the upper portion.
部成形部からの高さの異なる複数位置におけるそれぞれ
の中心軸から山部成形部の頂部と谷部成形部の頂部との
距離差が中心から環状接地部へ向かって徐々に小さく形
成され、縦断面で環状接地部成形部から中心へ向かって
滑らかな傾斜を有することを特徴とする二軸延伸ブロー
成形容器の形成型。11. The reinforcing portion molding portion provided in the convex portion molding portion according to claim 10, wherein each of the central axes at a plurality of positions having different heights from the annular grounding portion molding portion is a top portion of the mountain portion molding portion. And the top of the valley shaped part are formed to be gradually smaller from the center toward the annular grounding part, and have a smooth slope in the vertical section from the annular grounding part shaped part toward the center. Mold for axially stretch blow molded containers.
沿って形成される段部成形型を有することを特徴とする
二軸延伸ブロー成形容器の成形型。12. The biaxially stretch blow molded container according to claim 11, wherein the reinforcing portion molding portion provided in the convex portion molding portion has a step molding die formed along the circumferential direction. Mold of.
さの異なる複数位置に複数設けられており、 各段部成形部に設けられた山部成形部と谷部成形部は、
それぞれ中心軸から山部成形部の頂部と谷部成形部の頂
部との距離差が、環状接地部成形部に近い段部成形部に
なるにしたがって小さく形成されていることを特徴とす
る二軸延伸ブロー成形容器の成形型。13. The step forming part according to claim 12, wherein a plurality of the step forming parts are provided at a plurality of positions having different heights from the annular grounding part forming part in a longitudinal section, and the step forming parts are provided at respective peaks. The part forming part and the valley forming part are
The biaxial shafts are characterized in that the difference in distance from the central axis to the top of the mountain portion forming portion and the top of the valley portion forming portion becomes smaller toward the step portion forming portion closer to the annular grounding portion forming portion. Mold for stretch blow molding containers.
形部は円形又は多角形に形成されていることを特徴とす
る二軸延伸ブロー成形容器の成形型。14. The biaxially stretch blow molded container according to claim 13, wherein a plurality of step forming parts are provided, and the step forming part at the outermost peripheral position is formed in a circular or polygonal shape. Mold of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29380594A JP3423452B2 (en) | 1994-11-02 | 1994-11-02 | Biaxially stretch blow-molded container and its mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29380594A JP3423452B2 (en) | 1994-11-02 | 1994-11-02 | Biaxially stretch blow-molded container and its mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08133260A true JPH08133260A (en) | 1996-05-28 |
| JP3423452B2 JP3423452B2 (en) | 2003-07-07 |
Family
ID=17799387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29380594A Expired - Lifetime JP3423452B2 (en) | 1994-11-02 | 1994-11-02 | Biaxially stretch blow-molded container and its mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3423452B2 (en) |
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