JPH037324Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application) The present invention relates to an improvement in a cup-shaped container that is heat-sealed with a lid made of a metal foil/plastic film laminate, and particularly to an improvement in the structure of the opening portion of the container.

(Prior art) A cup-shaped container is heat-sealed with a lid made of a metal foil/plastic film laminate.
Today, they are widely available on the market as packaging containers for instant foods. On the upper rim of this type of container,
In order to satisfy the strength level specified in the heat sealing strength test method based on the Ministry of Health and Welfare Notification No. 20, an annular sealing rib is generally provided, and this rib part has a strong thermal bond with the sealing laminated lid member. is being carried out. Therefore, when trying to peel off the lid member before use, it becomes difficult to peel off, which often confuses the user, and this drawback is particularly noticeable in the case of containers for heat sterilization, which require strong adhesive strength. . Therefore, in order to improve this shortcoming to some extent, we decided to introduce the 8th
As shown in the figure, there is a proposal to provide a sharp protrusion (coracoid) 9 on a part of the rib, but at the beginning of peeling, a large shearing force is applied to the dotted bond between the tip of the coracoid and the lid member. Because of the concentrated force, there is a risk that the lid member will not be able to resist this force and tear from both sides of the bonded portion.

(Purpose) The present invention solves the above-mentioned problems with cup-shaped containers made from thermoplastic plastics, and provides a lid that is easy to peel off when in use, and that does not cause the lid to tear when peeled off. The purpose is to provide a cup-shaped container.

(Structure) In order to achieve the above-mentioned object, the present invention provides a cup-shaped container in which a coronoid for opening is provided on an annular rib surrounding the upper edge of the main body made of thermoplastic plastic. It is characterized by its height being smaller than other rib parts.

FIG. 1 is a plan view of the container showing the above configuration, and FIGS. 2 and 3 are lines XX and Y.
It is a partial sectional view along -Y.

The container 1 of the present invention is made of a plastic material that can be molded by general molding methods such as polystyrene, polyethylene, polypropylene, polyester, and other thermoplastic resins such as vacuum molding, pressure molding, compression molding, or injection molding. It is made into a cup shape of any shape, such as a conical shape or a truncated elliptical cone shape, and its mouth edge protrudes outward like a brim to form a flange portion 2.

On the upper flange portion 2, an annular rib 3 protrudes upward in the same way as in conventional containers of the same kind, and the rib extends outward at the photographing portion 4 to form an obtuse-angled protrusion (coracoid) 5. , forming a sharp tip 5a. It is preferable that both skirt portions of this obtuse-angled protrusion are curved in an asymptotic line toward the annular rib portions on both sides.

The ribs have different heights in the coracoid part and other parts (compare FIGS. 2 and 3),
It has been experimentally shown that the height H of the coracoid part 5 is 0.2 to 0.3 mm lower than the height h of the other rib parts, and its width is also 20 to 50% larger than the other rib parts. is preferred. In this way, when bonding, the coracoid part 5
The adhesion area in the area becomes 20 to 30% smaller than in other parts, and the adhesion force with the lid member decreases accordingly. Incidentally, the height and width of the ribs may be adjusted by processing the mold itself when molding the container, or
Alternatively, the coracoid part 5 may be lightly pressed with a hot plate prior to adhesion.

(Function) Place the lid member 6 on the above container, and
When thermally bonding is performed, a package similar to the conventional one can be obtained. However, as shown in FIGS. 4 and 5, in this package, the height of the ribs in the coracoid part 5 is lower than in other parts during thermal bonding.
As a result of the reduced pressure to which this section is subjected, the adhesive strength is also reduced compared to the other rib sections. Therefore, the lid member 6 can be peeled off much more easily than the conventional one with an obtuse-angled corona, and there is no fear that the lid member will be torn when opened, unlike the one with an acute-angled corona. That is, the present invention achieves the object of facilitating peeling of the lid member without substantially weakening the sealing strength by using a simple structure of changing the shape of the ribs.

(Example) FIG. 6 is a cutaway perspective view showing an example of a package using a container according to the present invention.

The container 1 is made of polystyrene sheet material using vacuum forming means into a truncated square pyramid shape with rounded edges, and the mouth edge thereof extends horizontally outward and has a rounded flange portion. 2, but only one corner of the latter forms a triangular photographing section 4.

The rib 3 bulges in an annular shape on the surface of the flange portion 2, and protrudes at an obtuse angle at the portion of the pickup portion 4 to form a coracoid portion 5. Both hems of this coracoid part 5 are
It forms an asymptotic line and continues to the ribs 3 on both sides. In addition,
The height of the ribs in the coracoid part 5 is made to be about 0.2 mm lower than the other rib parts.

The lid member 6 is thermally bonded to the entire rib 2 including the acute-angled protrusion 5 after the packaged object 7 is placed in the container 1 .

To open the above package, as shown in Fig. 7, peel off the lid member 6 at the photographed part 4, photograph both the photographed part and the corresponding lid member, and apply a shearing force P in the direction of the arrow.
Add to complete the peeling. As already explained, in this case, since the adhesive strength at the coracoid part 5 is relatively weak compared to other parts, peeling is extremely easy, and there is no risk of tearing the lid member in the middle.

(Effects) As explained above, although the present invention has an extremely simple structure, it facilitates the opening of the heat-sealed lid of this type of container and eliminates the risk of accidentally damaging the lid member during opening. This provides great benefits to users.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main parts schematically showing the structure of the proposed container, and FIGS. 2 and 3 are the same line
4 and 5 are partial sectional views taken along the lines Y-X and Y-Y, and sectional views corresponding to FIGS. The diagram is
FIG. 7 is a perspective view showing an example of a package using the container according to the present invention; FIG. 7 is a perspective view showing a method for opening the package shown in FIG. 6; FIG. 8 is a perspective view showing an example of a known cup-shaped container. FIG. The meanings of the main symbols in each figure are as follows: - 1: Proposed container, 1': Known container, 2: Flange portion of 1, 1', 3: 2 sealing rib, 3': 1' Seal rib, 4: 2 photographing section, 5: 3, 3' coracoid projection, 6: lid member, 7: packaged object, 8:
Packaging body using the container of the present invention, 9: Coracoid part of a known cup-shaped container.

Claims (1)

[Claims for Utility Model Registration] (1) A cup-shaped container having a coronoid for opening the container on an annular rib surrounding the upper edge of the main body made of thermoplastics, wherein the height of the rib of the coracoid is A cup-shaped container characterized by being smaller than other rib parts. (2) The container according to claim 1, wherein the width of the ribs in the coracoid part is larger than that in other rib parts.