JP2006224966A - Easy-open tubular bag - Google Patents

Abstract

To open a cylindrical bag by tearing in a direction perpendicular to a jointed heat-bonding portion, even if tearing starts from the left or right side edge of the cylindrical bag, the tube is smoothly caught without being caught during the tearing Provided is an easily openable cylindrical bag that can be torn and opened.
A biaxially stretched plastic film formed with a score line facing the opening direction, an easily tearable aliphatic polyester-based stretched film, a plastic film uniaxially stretched in the opening direction, and a group that is easily tearable in the opening direction. A pillow-type tubular bag comprising a laminated body in which a material film layer, an aluminum foil layer, and a heat-adhesive resin layer are laminated, and having a palm heat-bonding portion and an edge heat-bonding portion. However, it is an easily openable cylindrical bag of the structure formed so that the outer edge of the joint heat-bonding part may be located on the cylindrical bag side edge.
[Selection] Figure 1

Description

  The present invention comprises a laminate in which an outer layer is a base film, and is used to open a cylindrical bag having a palm thermal adhesive portion and an edge thermal adhesive portion by tearing in a direction orthogonal to the palm thermal adhesive portion. The present invention relates to an easily openable cylindrical bag that can be opened smoothly by tearing in the direction perpendicular to the jointed heat-bonding portion, even if tearing is started from the left or right side end of the bag.

Conventionally, a transparent synthetic resin film / paper provided with perforations or cutouts as a packaging bag that has good openability and is excellent in the flowability of the contents when packaging contents such as powders and granules. A packaging sheet made by laminating an aluminum foil and a heat-sealable resin on the bottom surface of a packaging substrate such as a cylinder so that the heat-sealable resin layer is on the inside and the perforations or notches are perpendicular to the longitudinal direction. A perforation characterized by sealing the upper and lower ends of the bag so that the longitudinal direction is sealed and the perforation or notch is located at the top or / and bottom of the bag for easy opening There is known a cylindrical bag (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 57-202966

  However, in the case of a cylindrical bag having the above-mentioned perforation, the longitudinal seal portion is long when the side end portion of the bag is grasped and the cylindrical bag is torn along the perforation in the direction perpendicular to the longitudinal seal portion. Since it is located at the approximate center in the width direction of the bag in the direction orthogonal to the direction seal portion, when tearing from the side edge of the cylindrical bag in the direction opposite to the outer end edge side of the longitudinal seal portion, follow the perforation. Even if it reaches the inner end part of the longitudinal seal part, it can be torn and opened smoothly, but when tearing from the side edge of the cylindrical bag on the outer edge side of the longitudinal seal part, When tearing from the edge along the perforation and reaching the position of the inner end of the longitudinal seal portion, the longitudinal seal portion is bent in the direction opposite to the tear direction, so the tear is longer Position of inner end of direction seal Has the disadvantage that can not be opened will tear smoothly stopped at.

  The object of the present invention is to open the tubular bag by tearing in the direction perpendicular to the palm heat-bonding portion, even when tearing is started from the left or right side edge of the tubular bag, It is an object of the present invention to provide an easily openable cylindrical bag that can be smoothly opened and opened without being easily torn at an inner end portion of an adhesive portion.

  In a cylindrical bag comprising a laminate in which a base film layer, an aluminum foil layer, and a heat-adhesive resin layer are laminated, and having a palm heat-bonding portion and an edge heat-bonding portion, the base film layer is edge heat-bonding It is made of a film that is easily tearable in the direction parallel to the part or a film that has been subjected to an easy tearing process, and the palm heat-bonding portion is formed such that the outer edge of the palm-to-wall heat bonding portion is located in the vicinity of the edge of the cylindrical bag side It is an easily openable cylindrical bag having a configuration.

  Said easily openable cylindrical bag WHEREIN: The said base film layer is a structure which consists of a biaxially stretched plastic film in which the score line which faces a parallel direction with an edge thermal-bonding part was formed.

  Said easily openable cylindrical bag WHEREIN: The said base film layer is a uniaxially stretched plastic film by which the said base film layer was uniaxially stretched in the direction parallel to an edge thermal-bonding part, a cylindrical bag A biaxially stretched film in which fine scars continuous in the flow direction are formed in a region that becomes an edge in the state of a sheet before being formed into a sheet and a crease in a state that is formed in a cylindrical bag, and cellophane It is.

  By adopting the easy-opening cylindrical bag of the present invention, the palm heat-bonding portion is configured so that the palm-shell heat bonding portion outer edge is located in the vicinity of the cylindrical bag-side edge, When tearing from the cylindrical bag side edge opposite to the outer edge of the jointed thermal adhesive part in the direction orthogonal to the jointed thermal adhesive part, the inner end of the longitudinal seal part is torn from the cylindrical bag side edge. Even if it reaches this part, it can be torn and opened smoothly. In addition, when tearing and opening the cylindrical bag in the direction orthogonal to the jointed thermal adhesive part from the edge of the cylindrical bag on the outer edge side of the jointed thermal adhesive part, the tubular shape in which the jointed thermal adhesive part overlaps Grasping the bag side end, tearing the palm heat bonding part and the cylindrical bag side end at the same time to start opening, so after opening at the cylindrical bag side end, the tube smoothly The bag can be opened by tearing the bag in the direction orthogonal to the palm-to-palm heat bonding portion.

  In the inventions according to claims 2 and 3, tearing can be started from the end portion on the cylindrical bag side, and the cylindrical bag can be smoothly torn and opened in the direction orthogonal to the palm-welded heat bonding portion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a first embodiment of an easily openable cylindrical bag of the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line II in FIG. 1, and FIG. 3 shows the configuration of the laminate of the first embodiment. Fig. 4 is an enlarged sectional view taken along line II-II in Fig. 1, Fig. 4 is a plan view showing a second embodiment of the easily openable tubular bag of the present invention, and Fig. 5 is a diagram showing the configuration of the laminate of the second embodiment. FIG. 2 is a corresponding enlarged cross-sectional view, wherein 2 is a joint thermal bonding part, 2a is a joint thermal bonding part outer edge, 3, 4 is an edge thermal bonding part, 5 and 6 are cylindrical bag side edges, and 7 is a cut. Line of sight, 10 and 10 'are laminates, 11 and 11' are base film layers, 12 and 14 are polyethylene layers, and 13 is an aluminum foil.

  1st Embodiment of the easily openable cylindrical bag of this invention is as showing in FIGS. 1-3. As shown in FIG. 1, the planar shape of the first embodiment is a pillow-type cylindrical bag formed by a palm heat-bonding portion 2 and edge heat-bonding portions 3, 4. The outer edge 2a of the jointed heat-bonding portion is formed so as to be located in the vicinity of one cylindrical bag-side edge 6, and the opening cut line 7 made of a perforation is formed on the upper and lower edge heat-bonding portions 3. , 4 is formed in a direction perpendicular to the palm-welded thermal bonding portion 2 at a position inside by a predetermined distance. As shown in FIG. 2, the cross-sectional shape in the direction perpendicular to the palm heat bonding portion 2 of the first embodiment is such that the palm heat bonding portion 2 has a palm heat bonding portion outer edge 2 a on the cylindrical bag side edge 6. It is formed in the position shifted from the center part of the width direction of a cylindrical bag so that it may come.

  The laminated body 10 which comprises the cylindrical bag of 1st Embodiment consists of biaxially stretched films, such as a biaxially stretched polyethylene terephthalate film in which the score line for opening was formed in order from the outer surface, as shown in FIG. The substrate film layer 11, the polyethylene layer 12, the aluminum foil layer 13, and the polyethylene layer 14 are laminated. The opening cut line 7 formed in the biaxially stretched film in the first embodiment is perforated, but if it is torn linearly, the shape of the cut line is arbitrary and is a continuous linear cut line It can also be.

  2nd Embodiment of the easily openable cylindrical bag of this invention is as showing in FIG. 4, FIG. The planar shape of the second embodiment is as shown in FIG. 4, and the base film layer 11 ′ constituting the laminate 10 ′ used in the second embodiment is an easily tearable aliphatic polyester stretch. The film is basically composed of a uniaxially stretched plastic film that is uniaxially stretched in the opening direction, except that it is composed of an easily tearable base film that is not formed with a score line for opening. It is the same structure as 1 embodiment. In the second embodiment, the base film layer 11 ′ is composed of an easily tearable aliphatic polyester-based stretched film, a uniaxially stretched plastic film that is uniaxially stretched in the opening direction, and cellophane. Even if it is not formed, it is easy to tear.

  In the easy-opening cylindrical bag of the present invention, the palm heat bonding part 2 is formed so that the palm heat bonding part outer end edge 2a is located in the vicinity of one cylindrical bag side edge 6. By tearing the easy-opening tubular bag from the tubular bag side edge 5 opposite to the outer edge 2a of the palm heat bonding portion in the opening direction perpendicular to the palm heat bonding portion 2, Since the end portion is easily torn, the tubular bag can be opened, and the tubular bag side edge 6 on the outer edge 2a side of the palm heat bonding portion is cylindrical in the direction orthogonal to the palm heat bonding portion 2. When tearing and opening the bag, the palm heat bonding part 2 is in a state where it overlaps the cylindrical bag side edge 6 and overlaps the cylindrical bag side edge 6 and the cylindrical bag side edge 6. Grasping the jointed thermal bonding part 2 and tearing the tubular bag side edge 6 and the jointed thermal bonding part 2 to start the opening, and subsequently the tubular bag in the direction perpendicular to the jointed thermal bonding part 2 Simply it can be tearing open. Therefore, in the easily openable cylindrical bag of the present invention, even if opening is started from any of the cylindrical bag side edges 6, 7, it can be opened by tearing in the direction perpendicular to the palm-joining heat bonding portion 2.

  The base film layer 11 of the laminate used in the first embodiment is a base film layer 11 having a configuration in which perforated cut lines 7 are formed on a biaxially stretched film such as a biaxially stretched polyethylene terephthalate film. To form the perforated cut line 7 on a biaxially stretched film such as a biaxially stretched polyethylene terephthalate film, use a rotary die cutter or the like on the biaxially stretched film and register it with the printed pattern. A cut line 7 having a predetermined shape is formed at the position. The laminate 10 can be produced by laminating the polyethylene layer 12, the aluminum foil layer 13, and the polyethylene layer 14 on the plastic film in which the score line 7 is formed. The cut line may be a continuous line instead of a perforation.

  The base film layer 11 'of the laminate used in the second embodiment is composed of an easily tearable aliphatic polyester-based stretched film, a uniaxially stretched plastic film uniaxially stretched in the opening direction, and cellophane. As the easily tearable aliphatic polyester-based stretched film, as described in JP-A No. 2003-261696, the main component is a lactic acid-based polyester resin having a longitudinal and lateral end tear resistance of 22 N or less. Thus, an easily tearable aliphatic polyester-based stretched film produced by irradiation with actinic rays can be used. Examples of uniaxially stretched plastic films include homo- or copolymers of α-olefins such as polypropylene, polyethylene, and polybutene-1, polyesters such as polyethylene terephthalate and polyethylene terephthalate / isophthalate, nylon-6, nylon 6, A uniaxially stretched film made of a resin such as polyamide such as 6 can be used.

  As a base film layer constituting the laminate, a biaxially stretched film such as a biaxially stretched polyethylene terephthalate film formed with a score line facing the opening direction, an easily tearable aliphatic polyester stretched film, a uniaxial stretch in the opening direction Uniaxially stretched plastic film, a region that becomes an edge in the state of a sheet before being formed into a cylindrical bag, and a group of fine scars that are continuous in the flow direction in a region that is a fold in a state that is formed in a cylindrical bag The formed biaxially stretched film, cellophane, etc. can be used. The thickness of the polyethylene layer is suitably 15 to 30 μm considering both the tearability of the bag and the strength of the bag. As a specific structure of the laminate, a biaxially stretched polyethylene terephthalate film having a score line 12 μm / polyethylene 15 μm / aluminum foil 7 μm / polyethylene 30 μm, an easily tearable aliphatic polyester-based stretched film 12 μm / polyethylene 15 μm / aluminum foil 7 μm / Polyethylene 30 μm, uniaxially stretched polyester film 12 μm / polyethylene 15 μm / aluminum foil 7 μm / polyethylene 30 μm, uniaxially stretched polypropylene film 20 μm / polyethylene 15 μm / aluminum foil 7 μm / polyethylene 30 μm, cellophane # 300 / polyethylene 15 μm / aluminum foil 7 μm / polyethylene 30 μm or the like.

The top view which shows 1st Embodiment of the easily openable cylindrical bag of this invention. FIG. 2 is an enlarged sectional view taken along line II in FIG. 1. The II-II line expanded sectional view of Drawing 1 showing the composition of the layered product of a 1st embodiment. The top view which shows 2nd Embodiment of the easily openable cylindrical bag of this invention. The expanded sectional view corresponding to Drawing 3 showing the composition of the layered product of a 2nd embodiment.

Explanation of symbols

2 Jointed thermal bonding part
2a Joint heat bonding part outer edge 3, 4 Edge heat bonding part 5, 6 Cylindrical bag side edge 7 Cut line
10, 10 'laminate
11, 11 'base film layer
12, 14 Polyethylene layer
13 Aluminum foil

Claims (3)

In a cylindrical bag comprising a laminate in which a base film layer, an aluminum foil layer, and a heat-adhesive resin layer are laminated, and having a palm heat-bonding portion and an edge heat-bonding portion, the base film layer is edge heat-bonding It is made of a film that is easily tearable in the direction parallel to the part or a film that has been subjected to an easy tearing process, and the palm heat-bonding portion is formed such that the outer edge of the palm-to-wall heat bonding portion is located in the vicinity of the edge of the cylindrical bag side An easily openable cylindrical bag, characterized by comprising The easily openable cylindrical bag according to claim 1, wherein the base film layer is made of a biaxially stretched plastic film in which a score line is formed in a direction parallel to the edge thermal bonding portion. The base film layer has an easily tearable aliphatic polyester stretched film, a uniaxially stretched plastic film uniaxially stretched in a direction parallel to the edge thermal bonding portion, and a sheet before being formed into a cylindrical bag. 2. The biaxially stretched film, cellophane, which is formed of a group of fine scars continuous in the flow direction in a region that becomes an edge and a region that becomes a fold in the state of being formed in a cylindrical bag. Openable cylindrical bag.

Images