JPH09226795A - Lid body for packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid body which can further reduce a stacking height than conventional lid bodies, and in addition, of which the engagement with the container main body can be surely performed, and also, which is suitable for a vacuum molding or pressure-vacuum molding of a synthetic resin sheet. SOLUTION: This lid body 10 covers the upper opening of a container main body which constitutes a packaging container. For such a lid body 10, at one part of a vertically hanging flange 13 being connected to the outer periphery of the top plate 11 by a horizontal flange 12, an engaging part 14 to be engaged with the lower surface of the opening outer edge of the container main body, is provided so as to protrude inward. Then, at a location higher than the engaging part 14 on the vertically hanging flange 13, a stacking stage part 15 comprising of a vertical surface 15a which vertically hangs at approx. the same location as the internal end of the engaging part 14 while retracting the outer edge of the horizontal flange 12 inward, and a tilted surface 15b which tilts externally downward from the lower end of the vertical surface 15a, is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid for a packaging container, which is mainly made of a synthetic resin sheet, and more particularly to a lid which is partially engaged with the outer edge of the container body. .

[0002]

2. Description of the Related Art In supermarkets, convenience stores, etc., various foods are packed in a container body and the upper opening of the container body is covered with a lid. In such a packaging container, the opening edge (flange) on the container body side is projected substantially horizontally, and the engaging portion protruding inwardly on the flange on the lid body is forced on the lower surface of this opening edge. The lid body is prevented from easily coming off from the container body by locking the lid body.

A large number of such lids are stacked before being fitted into the container body, that is, before covering the opening edge of the container body containing the contents. Of course, the product is shipped in such a state. For this reason, when a large number of these lids are stacked, it is necessary to reduce the overall volume and facilitate packing, and at the same time, when covering the container body containing the contents, It is also necessary to devise a mechanism that can be removed one by one.

Therefore, conventionally, for example, Japanese Patent Publication No. 56-
As in the cup lid proposed in Japanese Patent No. 14539, "In a cup lid having a skirt portion on the peripheral side portion, an annular recessed portion is provided around the upper surface, and the side skirt portion has a tapered shape that widens as a whole. When the lids are stacked, the segments provided below the back surface of the skirt portion engage with the upper step of the skirt portion of the lower cup lid adjacent to the skirt portion, and the drop portion has the lower cup lid. The stacking height (stack height) can be freely changed regardless of the length of the side skirt portion of the lid (column 2, line 37 to line 37 of the above publication). Column 3, line 2).

That is, in the cup lid of Japanese Patent Publication No. 56-14539, as shown in FIG. 3, since the skirt portion is formed in a tapered shape with a wide skirt, many cup lids are provided. Even if they are stacked, each cup lid can be stacked at the same height regardless of the size of the skirt. Of course, if the cup lids are completely in close contact with each other, it will be difficult to take them out individually.Therefore, an annular recess is provided around the upper surface of the cup lid, and when the cups are stacked, this drop is on the lower side. It should be placed on top of the lid.

Since the drop portions shown in FIG. 3 must not be fitted to each other when a large number of cup lids are stacked, they are formed so as to be inclined as shown in the drawing.
The lower end of each drop must be out of the lower drop opening. On the other hand, this type of lid is formed by subjecting a synthetic resin sheet to uneven processing by pressure molding or vacuum forming. However, for example, the lid should have a shape suitable for the vacuum forming, that is, easy to form. In addition, it must be shaped so that so-called die cutting can be performed reliably and easily.

In summary of the above, in the conventional cup lid shown in FIG. 3, since the "recessed portion" which is an essential component of the conventional cup lid is inclined, for example, by the vacuum forming method. Not only is it difficult to mold, but the die-cutting also causes deformation of the "dropped part" and white turbidity (especially when a transparent synthetic resin sheet is used) around it, which significantly reduces the commercial value. There is a risk of causing it.

Therefore, as shown in FIG. 4, there has been proposed a lid body having no "falling portion" for determining the stack high.
In the lid body shown in FIG. 4, a horizontal flange is formed on the outer periphery of the lower end of the top plate portion that originally functions as the lid body, and a hanging flange is formed so as to hang downward from the outer end of the horizontal flange. A locking portion is provided inwardly on a part of the hanging flange. When such lids are stacked as shown in FIG. 4, the inner end of the locking portion of the upper lid is placed on the connecting portion of the horizontal flange and the hanging flange so that both lids are placed. I tried to form some gaps between my bodies. In addition, in this lid body, a stop projection is partially formed, and the stack high is also secured by this stop projection.

By the way, in the case of the lid as shown in FIG. 4, the dimension h from the horizontal flange to the engaging portion is
In the case of vacuum forming with a general synthetic resin sheet, 4 mm or more is absolutely necessary. The reason is that if the dimension h is smaller than this, the wall thickness of this portion is inevitably thin, and sufficient rigidity cannot be ensured. It becomes. This is because if the rigidity of the locking portion is not weak, it is not possible to reliably engage with the opening edge of the container body at this portion, and it becomes meaningless as the locking portion. Further, the reason why the dimension of h is required to be 4 mm or more is that the engaging portion can be engaged with the opening edge on the container body side, in that the fitting is performed mechanically as well as manually. This is because it is better to have a size larger than this when performing it.

Then, in order to stack a large number of the lids shown in FIG. 4, a space of 4 mm or more is required between the lids. For example, if 20 lids are stacked and packed, the distance is 8 cm or more. You will need wasted space.

Therefore, the present inventor has conducted various studies on how to further reduce the stack height while sufficiently securing the rigidity of the locking portion to be engaged with the container body side. As a result, the present invention has been completed.

[0012]

SUMMARY OF THE INVENTION The present invention has been made based on the above-described background. The problem to be solved by the present invention is to secure a stack high while securing the rigidity of the locking portion with respect to the container body. To be smaller.

That is, the object of the present invention is to
It is possible to make the stack height smaller than that of the conventional one, and it is possible to surely engage with the container body, and moreover, a lid body suitable for vacuum or pressure molding from a synthetic resin sheet To provide.

[0014]

Means for Solving the Problems In order to solve the above problems, the means adopted by the present invention will be described with reference to the symbols used in the description of the following embodiments. A lid 10 for covering an upper opening of a container body 20 that is locked to a lower surface of an opening outer edge 21 of the container body 20 at a part of a hanging flange 13 connected to an outer periphery of a top plate portion 11 thereof via a horizontal flange 12. In the lid body 10 in which the locking portion 14 to be secured is provided inwardly, the locking portion is provided at a portion of the hanging flange 13 located above the locking portion 14 while the outer edge of the horizontal flange 12 is retracted inward. A plurality of the lids 10 are formed by forming a stack step portion 15 composed of a vertical surface 15a that hangs down at substantially the same position as the inner end of 14 and an inclined surface 15b that inclines downward and outward from the lower end of the vertical surface 15a. When stacked, upper lid 1 A part of the locking portion 14 of the packaging container is placed on the inclined surface 15b forming the stack step portion 15 of the lower lid body 10, and the lid body 10 of the packaging container. It is.

That is, the lid 10 is formed by forming a stack step portion 15 composed of a vertical surface 15a and an inclined surface 15b on the hanging flange 13 on the periphery thereof, and the stack step portion 15 is formed in the container body 20. It is formed in a portion located above the locking portion 14 for engaging with the opening edge 21 of the. In other words, the lid 10 has the locking portion 14 formed at a position substantially similar to the conventional one in order to maintain and secure the strength and rigidity of the locking portion 14.
In order to further reduce the stack height of the plurality of lids 10, a stack step portion 15 is formed in a portion of the hanging flange 13 located above the locking portion 14.

The lid 1 according to the present invention configured as described above
According to 0, first, the locking portion 14 to be engaged with the opening edge 21 of the container body 20 can be formed from the horizontal flange 12 with the dimension h shown in FIG. Horizontal flange 1 for maintaining strength and rigidity of the part 14
The minimum dimension from 2 can be ensured. In other words, the lid 10 can be reliably manufactured from a synthetic resin sheet by a vacuum forming method or the like without impairing the rigidity of the locking portion 14. As a matter of course, the hanging flange 13 formed with the engaging portion 14 has a stack step portion 15 formed of a vertical surface 15a and an inclined surface 15b, and thus has an uneven rib for reinforcement. A similar result is obtained, and the hanging flange 13 itself is reinforced by the presence of the stack step portion 15, and as a result, the locking portion 14 is also reinforced.

The stack step portion 15 does not have to be formed on the entire outer peripheral edge of the lid body 10. For example, when the lid body 10 has a quadrangular shape, the stack step portion 15 is partially centered around its four corners. It should be formed in the.

When stacking a plurality of the lids 10, the following is done. First, in the conventional lid body shown in FIG. 4, the locking portion is placed at the boundary portion between the horizontal flange and the vertical flange. However, in the lid body 10 of the present invention, as shown in FIG. As described above, the inclined surface 15b at the position where the locking portion 14 is further lowered from the upper surface of the horizontal flange 12
It will be placed on top. This is because the vertical surface 15a continuous with the inclined surface 15b is located at a position where the outer edge of the horizontal flange 12 is retracted inward, and constitutes a literal vertical surface. This is because the locking portion 14 of the lid 10 on the upper side can be moved smoothly on the inclined surface 15b of 10.

Conversely, since the stack step portion 15 determines the stack height between the lids 10 by the dimension of the vertical surface 15a thereof, the stack step portion 15 droops in order to secure sufficient rigidity of the locking portion 14. It can be said that the length of the flange 13 can be made sufficiently long. That is, the fitting is ensured while the portion of the lid body 10 (the hanging flange 13 and the skirt portion 17) to be fitted to the opening edge 21 of the container body 20 is shallowly stacked high by the vertical surface 15 a of the stack step portion 15. It can have a sufficient depth for

From the above, the stack height between the lids 10 is reduced by the height of the vertical surface 15a forming the stack step portion 15, as can be understood from the comparison between FIG. 2 and FIG. As a result, the stack high can be made about half of that of the conventional one shown in FIG. Therefore, when a large number of lids 10 are stacked, the dead space can be further reduced, and a large number of lids 10 can be easily packed.

Of course, in each lid 10, the skirt portion 17 which is the lower end edge of the lid 10 does not need to be changed. Therefore, when the stacked lids 10 are mechanically taken out one by one, For example, if this skirt portion 17 is used, it can be easily performed without making any changes to the conventional take-out device.

In the lid 10 of the following embodiment, as shown in FIGS. 1 and 2, the stopper projection 16 bulged upward in the figure at the boundary between the top plate 11 and the horizontal flange 12. Is formed, and a part of the other lid 10 comes into contact with the stopper projection 16 to determine the stack high between the lids 10, and the stopper projection 16 is very small. By doing so, the inflow of air between the lids 10 at the time of individually taking out the respective lids 10 is ensured, and the taking-out work is facilitated.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention configured as described above will be described with reference to a lid 10 which is an embodiment shown in the drawings. FIG. 1 is a partially enlarged view of the lid 10 according to the present invention. A perspective view is shown, and this lid body 10 is fitted into the opening edge 21 of the container body 20 shown by a virtual line in FIG. The container body 20 and the lid 1 fitted to the container body 20
0 is generally formed in a round shape or a substantially rectangular shape, but in any case, it is mass-produced using a synthetic resin as a material, and particularly the lid 10 is
It is formed integrally from a synthetic resin sheet by means such as a vacuum forming method.

As described above, since the lid 10 is formed of the synthetic resin sheet, in order to ensure sufficient rigidity after completion, for example, various unevenness is formed on the top plate portion 11 thereof. Alternatively, as shown in FIG. 2, the horizontal flange 12, the hanging flange 13, and the skirt portion 17 that surround the entire outer peripheral edge of the top plate portion 11 are integrally formed. Of course, since the lid 10 is fitted into the opening edge 21 of the container body 20, the end edge of the skirt portion 17 which is the lowermost edge thereof is slightly larger than the outer shape of the opening edge 21. There is.

The lid 10 of the present embodiment employs a synthetic resin [OPS (biaxially oriented polystyrene)] sheet having a thickness of about 0.21 mm and has a plane shape of 230 m in length.
Although it is formed as a rectangular shape having a length of about m and a width of about 190 mm, the locking portion 14 shown in FIG. 2 is formed at a position about 6.8 mm from the horizontal flange 12.
The locking portion 14 is formed by projecting inwardly on the depending flange 13 by the upper and lower inclined surfaces, and the angle of each inclined surface with respect to the horizontal plane is about 45 °.

A stack step portion 15 is formed on the hanging flange 13 located above the engaging portion 14, and the vertical surface 15a constituting the stack step portion 15 is formed.
Is located up to about 2.5 mm below the upper surface of the horizontal flange 12, and 45 from the lower end of the vertical surface 15a.
The inclined surface 15b that inclines outward and downward at an angle of ° is continuous. The dimension from the lower end of the vertical surface 15a to the engaging portion 14 is 4 mm, and the skirt portion 17 is continuous from the central portion of the engaging portion 14 to about 0.3 mm below.

In other words, the inclined surface 15b forming the stack step portion 15 is about 2.5 m from the horizontal flange 12.
It begins to incline from below and the horizontal flange 12
The distance from the skirt to the skirt 17 is about 10 mm. Further, the inner end of the locking portion 14 is located outside the extension surface of the vertical surface 15a. As a result, between the two lids 10 stacked as shown in FIG.
The size between the skirts 17 is about 4.2.
It has a space of 5 mm.
In addition, in the lid body 10 of the present embodiment, the height of the stopper protrusion 16 is about 4 mm.

Of course, in the lid 10 of the above embodiment,
Since the distance from the horizontal flange 12 to the locking portion 14 is 6.8 mm, the stack height is about 4 mm, but the size from the horizontal flange 12 to the locking portion 14 is
That is, if the height of the hanging flange 13 is made smaller, the stack height can be made smaller than 4 mm, which is relative to the height of the hanging flange 13.

[0029]

As described above, according to the present invention,
The stack step portion 15 including the vertical surface 15a and the inclined surface 15b is formed in the portion of the hanging flange 13 which is located above the locking portion 14, which is a characteristic feature of the structure. It is, of course, possible to provide a lid which can be made smaller than the above, can be reliably engaged with the container body, and can be suitable for vacuum or pressure forming from a synthetic resin sheet. You can do it.

Particularly, since the inclined surface 15b forming the stack step portion 15 of the lid 10 is inclined outward and downward, it is stacked from the upper side of the lid 10. Since the locking portion 14 of another lid 10 is guided so as to slide outward, stacking between the lids 10 is facilitated. In this kind of substantially rectangular lid body 10, the stack step portion 1 is provided at each corner portion.
This is because it is general to form each of the lids 5, and the stack step portions 15 of the lid body 10 that are located in point symmetry with each other guide the lid bodies 10 that are stacked.

Further, each inclined surface 15b has a locking portion 14 of another lid body 10 stacked from the upper side of the lid body 10.
Since they are placed while being guided so as to slide outward, stacking between the lids 10 can be stably performed. On the other hand, since the vertical surface 15a of the stack step portion 15 is literally vertical, the stability when stacking the lids 10 in the vertical direction is ensured, and the stability of the stacked lids 10 is ensured. Is improved.

In the lid 10 of the present invention, the portion where the locking portion 14 is formed is not formed in a tapered shape with a wide skirt, so that a large number of stacked lids 10 are formed.
During storage, the lids 10 are not crushed and the lower surface opening is not deformed into a splayed state.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a lid according to the present invention and a container main body to which the lid is fitted.

FIG. 2 is a view showing a state in which two lid members are stacked, and is an enlarged sectional view taken along line 1-1 of FIG.

FIG. 3 is a cross-sectional view when two conventional lids are stacked.

FIG. 4 is a partial enlarged cross-sectional view showing a state in which another conventional lid is stacked.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lid 11 Top plate 12 Horizontal flange 13 Hanging flange 14 Locking part 15 Stack step part 15a Vertical surface 15b Sloping surface 16 Stop projection 17 Skirt part 20 Container body 21 Opening edge

Claims (1)

[Claims] 1. A lid for covering an upper opening of a container body that constitutes a packaging container, wherein a part of a hanging flange connected to an outer periphery of a top plate of the container via a horizontal flange has an outer edge of the opening of the container body. In the lid body in which the locking portion to be locked on the lower surface is provided inwardly projecting, in the portion located above the locking portion of the hanging flange,
A stack step portion including a vertical surface that hangs at the substantially same position as the inner end of the locking portion while retracting the outer edge of the horizontal flange inward, and an inclined surface that inclines downward from the lower end of the vertical surface. When a plurality of the lids are formed and stacked, a part of the locking portion of the upper lid is placed on the inclined surface that constitutes the stack step of the lower lid. A lid for a packaging container, characterized in that