JPS593979Y2 - easy-to-open containers - Google Patents

Description

[Detailed description of the invention] The present invention relates to an easy-to-open container that has a multi-chamber structure with partition walls, and is extremely easy to open, especially at the intersection of the partition walls, and also has boiling resistance and high-pressure sterilization resistance. This is what I did.

Conventional packages using plastic laminated films that are sealed by heat sealing include the following configurations.

For example, as shown in FIG. 1, two laminated films using a heat-sealable film such as polyethylene as the innermost layer 1 are stacked one on top of the other, and a heat-sealed portion is provided and sealed.

However, it was very troublesome to open the package because the heat seal was extremely strong.

Therefore, in order to improve this, a package has been considered in which the thickness of the innermost layer film 1 is reduced and the breaking strength of the innermost layer film 1 is smaller than the heat sealing strength of the innermost layer films 1 to each other.

However, even in this package, the heat-sealed portion could not be opened and the innermost layer film 1 was broken as shown in FIG.

Therefore, in order to open the package, it was necessary to tear the innermost layer film 1 by the width of the heat-sealed portion a, and no major improvement could be expected.

Furthermore, in order to make opening easier, it has been considered that the innermost layer film 1 is heat-sealed with films made of different resins, such as polyethylene and polypropylene films, and the heat-sealing strength is very low.

Such packaging has a narrow range of suitable heat sealing and is inferior in terms of boiling resistance, high pressure sterilization resistance, etc., and has the disadvantage that the contents that can be packaged are limited. Was.

Further, in a container having a multi-chamber structure with partition walls as shown in FIG. 3, when the lid material was heat-sealed and sealed, heat-sealing was simply performed along the partition wall 2 and the peripheral wall 3.

Therefore, when opening the lid material, in addition to the above-mentioned drawbacks, it is difficult to open the lid material at the intersection of the partition walls, and the film may be torn.

The present invention eliminates these conventional drawbacks,
The container is easy to open not only at the opening section but also at the intersection seal section of the wall, and also has boiling resistance and high pressure sterilization resistance.

The present invention will be explained in detail below.

As shown in FIG. 4 and FIG. It is made of a single resin having the same heat-sealing property as the first layer 4 of the attached body 6 or 1 to 5 kg and 715 mm width, or a laminate having this resin on the sealing side, and is separated from the container 8 having a multi-chamber structure by the partition wall 2. This is an easy-to-open container in which a heat-sealed portion 9 is provided along an overlapping peripheral wall 3 and a partition wall 2.

Here, an opening part 10 provided in a part of the peripheral wall 3 and an intersection seal part 11 between the peripheral wall 3 and the partition wall 2 include a protruding seal 12 protruding in the opening direction and a protruding part inside the protruding seal 12. An acute-angled unsealed portion 13 shaped according to the seal 12
It is a shape that has .

The angle of this unsealed portion 13 is 75° or less, preferably 6
The angle is preferably 0° or less.

Combinations of the first layer 4 and second layer 5 include the following.

Rubber-added polypropylene/medium density polyethylene,
High-density polyethylene/polypropylene with added rubber,
There are combinations of polypropylene/ethylene-vinyl acetate copolymer, polypropylene+ethylene-vinyl acetate copolymer/high-density polyethylene, and nylon/ionomer resin.

Here, not only is the former the first layer and the latter the second layer, but the reverse is also possible.

Here, polypropylene is homopolymer, ethylene
Either a propylene copolymer or a mixed resin of polyethylene and polypropylene.

Examples of rubber include polyisobutylene, ethylene-propylene, elastomer, and styrene-butadiene rubber.

The layer thickness of the first layer 2 is 50μ or less, preferably 30μ or less.

If the thickness is 50 μm or more, the first layer cannot be easily broken at the heat-sealed portion, making it difficult to open the package.

The container of the present invention is opened in the state shown in FIG.

That is, the first layer ruptures at the boundary between the heat-sealed portion and the non-heat-sealed portion of the container of the present invention, and the first layer and the second layer peel off at the heat-sealed portion to open the container.

This is because the heat sealing strength between the first layer 4 and the container 8 is greater than the breaking strength of the first layer 4, so when the sealing body 6 is pulled apart, the first layer breaks first at the outer boundary of the heat sealed portion. .

In the heat-sealed portion, the heat-seal strength of the first layer and the second layer is lower than the heat-seal strength of the first layer and the base, so that the first layer and the second layer separate.

Then, at the inner border of the heat-sealed portion, the first layer ruptures as at the outer heat-sealed portion, and the container is opened.

Conventionally, all the heat-sealed parts had to be broken, but the container of the present invention can be opened easily by simply breaking the container at the boundary between the heat-sealed part and the non-heat-sealed part.

In addition, if the seal has a shape in which a protrusion is provided only on the outside without leaving any sharp unsealed parts at the unsealed part and the intersection seal part, the inner layer film will be cut only at the first protrusion part, and it will appear as if the seal has been opened, but the film will be Do not cut along the width of the sticker,
The stacked layers peel off and the inner film remains, making it impossible to open the package completely.

This invention seals by providing an acute-angled unsealed part at the unsealed part and the intersection seal part, so the inner layer film does not remain as described above, and it can be reliably and easily sealed along the sealing width and the sealing direction. Can be opened.

Furthermore, the peel strength of the first layer and the second layer is 300 to 500 g.
/15mm width, heat seal strength 1-5kg/15m
Since it is 1.5 m wide, it will not peel off or burst even if it is boiled and high-pressure sterilized, so the restrictions on the contents have been greatly reduced.

The container of the present invention can have not only the two-chamber shape shown in FIG. 4 but also the shape shown in FIGS. 7 and 8.

Next, embodiments of the present invention will be described.

Example Resin A, which is an ethylene-propylene copolymer with 10 wt% of Atmer E (manufactured by Mitsui Petrochemicals) added, and polypropylene B were coextruded to obtain a laminated film such that A was 40μ and B was 30μ. Ta.

The A side of this laminated film and a stretched nylon film (thickness: 25 μm) were bonded together by dry lamination using an isocyanate adhesive to form a lid material.

A polypropylene film having a thickness of 350 μm was then molded to obtain a tray having two chambers as shown in FIG.

This tray was stacked with a lid material, and the periphery and partition walls were heat-sealed, so that the shape of the seal at the opening portion and the intersection seal portion was as shown in FIG. 4.

The angles of these seal portions were 60° at the unsealing portion and 75° at the intersection seal portion.

The width of the surrounding heat-sealed portion was 4 mm.

When this container was opened from the opening part, the breaking strength was 400 g or less at the beginning of opening, 600 g or less at the middle of the protrusion seal, and 1000 g or less when the unsealed part was reached.

The breaking strength from the opening part to the intersection seal part is 50
0 g or less, and the breaking strength of the intersection seal part was also 1000 g or less, making it possible to easily open the seal without leaving layer A behind.

At this time, the peel strength of layer A and layer B is 400 g715 m
The heat seal strength was 3.5 kg/15 mm, which sufficiently withstood high-pressure sterilization.

[Brief explanation of drawings]

Figures 1, 2, and 3 are explanatory diagrams showing the conventional opening method and seal shape, Figure 4 is a plan view showing an embodiment of the present invention, and Figure 5 is Figure 4 I-I FIG. 6 is an explanatory diagram showing the present invention in an unsealed state, and FIGS. 7 and 8 are explanatory diagrams of other embodiments of the present invention. 1... Innermost layer, 2... Partition wall, 3...
... Peripheral wall, 4 ... First layer, 5 ...
2nd layer, 6... sealed body, 8... container,
9...Heat seal part, 10...Opening part, 11...Intersection seal part, 12...
Projection seal, 13...Unsealed part.

Claims (2)

[Scope of utility model registration request] (1) A container with a lid material heat-sealed to a multi-chambered container with a partition wall, where the opening part and the intersection seal part of the partition wall have a protruding seal in the opening direction and a protruding seal on the inside of the protruding seal. An easy-to-open container with a shape that conforms to the following and an unsealed portion with an acute angle. (2) The easy-to-open container according to claim 1, wherein the angle of the acute unsealed portion is 75° or less.