JP7618164B2 - Food packaging bags - Google Patents

Description

This invention relates to a food packaging bag for storing solid foods such as rice balls, sushi, and sandwiches.

For solid foods such as rice balls, sushi, and sandwiches that can be eaten by hand, it is convenient to not remove the food completely from the packaging, but to open part of the packaging to expose the food, and then hold the food through the packaging while leaving the food in the remaining part, allowing you to eat without getting your hands dirty.

A known food packaging bag is one that is made of a film base in which a roll-up film and a non-roll-up film are joined together with one end overlapping the other, the joining being performed by a heat seal line running vertically across the width while leaving the tip of the roll-up film as an allowance for rolling up when opening the bag, the other ends are butted together in a palm-to-palm manner and joined by heat sealing, and both open ends of the films are heat sealed (Patent Document 1).

Figures 12 to 19 are diagrams for explaining the food packaging bag. This food packaging bag is manufactured by the following process.

Figures 12 and 13 show the film base Y that constitutes the food packaging bag. This film base Y is composed of a synthetic resin film that is joined to a roll-up side film 12 and a non-roll-up side film 11. The two films are joined with one end overlapping each other, and the tip of the roll-up side film 12 is left as a roll-up allowance 13 for opening, and the film is joined at a position set back from the tip of the roll-up side film by a heat seal line S10 that runs vertically across the width.

The film substrate Y is folded into a cylindrical shape, and the other ends 11A and 12A are butted together and joined by heat sealing (see Figure 14). Next, one open end of the tube is sealed with a heat seal line S20 to form a bag (see Figures 15 and 16).

Next, food F is placed inside the tube from the other open end (see Figure 17), and the other open end is sealed with a heat seal line S30 (see Figure 18), and the product is then distributed in this state as a packaged food product.

When the customer picks up the wrapping margin 13 of the wrapping film 12 of the packaged food and pulls it away while wrapping it, the seals on both sides of the bag that were attached by the seal lines S20 and S30 and the adhesion between the wrapping film and the non-wrapping film that were attached by the heat seal line S10 are released, and the wrapping film is folded up significantly relative to the non-wrapping film that encases the food F, exposing part of the food (see Figure 19).

In the actual manufacture of the food packaging bags, the film substrate Y is manufactured in a continuous, long shape in the width direction, which is then wound up on a supply roll, and the film substrate supplied from the supply roll is cut to the individual product dimensions. In this case, if there is an unevenness in the thickness of the film substrate due to the swelling of the overlapping areas, when the film substrate is wound up, the thickness of the central area where the overlapping areas are located will be uneven from the left and right sides, resulting in an uneven winding diameter and the risk of wrinkles, etc.

For this reason, strip-shaped balance tapes 15 and 14 with heat sealability are arranged on the surface of the roll-up film 12, which will become the inside of the bag when the bag is made, and on the non-roll-up film 11.

Patent No. 5764280

In the above-mentioned conventional technology, both ends of the turn-over margin 13 of the turn-over film 12 (areas surrounded by circles S in Figures 15 to 18) are strongly adhered to the bag by heat seal lines S20 and S30 that seal the open ends of the bag.

As a result, when opening the package, there was a problem in that the resistance created by the roll-up margin 13 of the roll-up film 12 created resistance when the package was being pulled apart while being rolled up, making it difficult to pull apart.

To solve the above problem, both ends of the turn-over margin 13 of the turn-over film 12 could be left unattached, but there was a risk that the turn-over margin would move freely during distribution and be turned over accidentally, causing the heat seal line S10 to come apart.

The present invention was created with the aim of providing a food packaging bag that solves the above problems.

That is, the present invention comprises a film substrate in which a turn-up side film and a non-turn-up side film are joined together with one end of each film overlapping each other,
The above-mentioned joining is performed by a heat seal line running vertically across the width, leaving the leading end of the film on the turn-over side as a turn-over margin for opening,
The other ends are butted together in a palm-to-palm shape and joined by heat sealing.
The left and right open ends of both films are sealed by heat sealing.
In order to eliminate unevenness in the thickness of the film substrate due to the swelling of the overlapping portions at the stage of winding up the long film substrate before the film substrate is cut out, a belt-shaped balance tape having heat sealability is provided which is bonded to the surface of the film to be rolled up, which will become the inside of the bag when the bag is made, and to the surface of the film not to be rolled up.
In food packaging bags made of synthetic resin film,
This is characterized by providing an ink layer at the heat-sealed areas of both open ends of the overlapping area of the turn-up side film and the non-turn-up side film, which serves as the turn-up margin, thereby weakening the heat seal strength of these areas.

The invention described in claim 2 is characterized in that in the food packaging bag, the ink layer is partially provided at the overlapping portion of the roll-up side film and the non-roll-up side film that forms the roll-up margin, and at the sealed portions by heat sealing at both open ends.

In the food packaging bag of the present invention having the above configuration, an ink layer is provided at the overlapping portion of the roll-up film and the non-roll-up film, and at the heat-sealed sealed portion of both open ends, weakening the heat seal strength at that portion, which has the effect of reducing resistance when the roll-up film is pinched by the roll-up margin and pulled apart while rolling when opening.

On the other hand, because both ends of the film to be turned over are glued, there is no risk of the film moving freely during distribution and being turned over accidentally, causing the heat seal line to come apart.

1 is a cross-sectional view of a food packaging bag according to the present invention in an unfolded state. FIG. Same as above, cross-sectional view. Same as above, cross-sectional view of the process of use. Same as above, cross-sectional view of the opening process. Same as above, cross-sectional view of the opening process. FIG. FIG. FIG. FIG. FIG. FIG. 1 is a cross-sectional view of a conventional food packaging bag in an unfolded state. FIG. FIG. FIG. Same as above, cross-sectional view of the bag making process. FIG. FIG. FIG.

Specific examples of the present invention will be described below with reference to the attached drawings. Here, we will explain by taking as an example a food packaging bag for packaging rice balls. This packaging bag is made of a film base in which a roll-up film and a non-roll-up film are joined together with one end overlapping, and the joining is performed by a heat seal line running vertically in the width direction while leaving the tip of the roll-up film as a roll-up allowance for opening, and the other ends are butted together in a folded manner and joined by heat sealing, and both left and right open ends of both films are sealed by heat sealing. This is an improvement on a known food packaging bag.

Figures 1 to 11 are diagrams for explaining the food packaging bag of the present invention. This food packaging bag is manufactured by the following process.

Figures 1 and 2 show the film substrate X before it is made into a packaging bag. This film substrate Y is made by joining a synthetic resin film 2 that is turned over and a film 1 that is not turned over, and here, a PP film with easy-to-open seal properties is used as the synthetic resin film. The two films are joined with one end overlapping each other, and at this time, the tip of the film 2 that is turned over is left as a turn-over allowance 3 for opening, and the film is joined at a position set back from the tip of the film that is turned over by a heat seal line S1 that runs vertically across the width.

An ink layer 6 is printed on both ends of the non-turning film 1 of the film base X where the turn-up margin 3 of the turning-up film 2 overlaps (area surrounded by a circle T in Figures 8 to 10). This ink layer 6 is intended to weaken the heat seal strength for sealing both open ends of the film, which will be described later, and this ink layer may be provided on both ends or partially.

When manufacturing the food packaging bags, the film substrate Y is manufactured in a long strip with a continuous width, and is printed with letters and patterns. It is then wound up on a supply roll, and the film supplied from the supply roll is cut to the individual product dimensions. In this case, if there is an uneven thickness of the film substrate due to the bulge at the overlapping portion, when the film substrate is wound up, the thickness of the center where the overlapping portion is located and the thickness of the left and right portions will be uneven, resulting in an uneven winding diameter and the risk of wrinkles.

For this reason, strip-shaped balance tapes 5, 4 having heat sealability are arranged on the surface of the roll-up film 2 that will become the inside of the bag when the bag is made, and on the non-roll-up film 1. Of these, the strip-shaped balance tape 5 that is arranged on the surface of the roll-up film 2 that will become the inside of the bag when the bag is made is arranged so that a portion of it is located at the joining point between the roll-up film and the non-roll-up film, which will be described later. Here, a portion 5A of the balance tape 5 in the width direction is arranged so that it is located at the joining point 2A between the roll-up film 2 and the non-roll-up film 1 (see Figure 3).

The film substrate X is folded into a cylindrical shape, and the other ends 1A, 2A are butted together in a folded shape and joined by heat sealing (see FIG. 3). At this time, the balance tape 5 adhered to the roll-up side film 2 is arranged so that a portion 5A in the width direction is located at the folded part of the roll-up side film and the non-roll-up side film, so that it is sandwiched and adhered between the folded part 2A of the roll-up side film and the folded part 1A of the non-roll-up side film at the folded part, and is prevented from being pulled by the overlapping roll-up side film and peeled off when opening.

One open end of the cylindrical film substrate X is sealed with a heat seal line S2 to form a bag (see Figure 5).

Next, food F is placed inside the tube from the other open end (see Figure 9), and the other open end is sealed with a heat seal line S3 (see Figure 10), and the product is then distributed in this state as a packaged food product.

When the customer picks up the above-mentioned packaged food by the roll-up margin 3 of the roll-up film 2 and pulls it away, the seals on both sides of the bag that were attached by the seal lines S2 and S3 and the adhesion between the roll-up film and the non-roll-up film that were attached by the heat seal line S1 are released, and the roll-up film is rolled up significantly relative to the non-roll-up film that encases the food F, exposing part of the food (see Figures 5, 6, and 11).

As a result, the food F can be eaten without getting its hands dirty by opening part of the packaging bag to expose the food, leaving the food in the remaining part, and holding the food through the packaging bag.

X Film base 1 Non-turn-up side film 1A Joint portion of non-turn-up side film 2 Top-turn-up side film 2A Joint portion of top-turn-up side film 3 Turn-up margin 4 Balance tape 5 Balance tape 5A Part of balance tape in width direction 6 Ink layer S1 Heat seal line S2 Heat seal line S3 Heat seal line F Food

Claims (2)

The film substrate is made of a film substrate having a turn-up side film and a film substrate having a non-turn-up side film joined together with one end of the film substrate overlapping the other end of the film substrate.
The above-mentioned joining is performed by a heat seal line running vertically across the width, leaving the leading end of the film on the turn-over side as a turn-over margin for opening,
The other ends are butted together and joined by heat sealing.
The left and right open ends of both films are sealed by heat sealing.
In order to eliminate unevenness in the thickness of the film substrate due to the swelling of the overlapping portions at the stage of winding up the long film substrate before the film substrate is cut out, a belt-shaped balance tape having heat sealability is provided which is bonded to the surface of the film to be rolled up, which will become the inside of the bag when the bag is made, and to the surface of the film not to be rolled up.
In food packaging bags made of synthetic resin film,
This food packaging bag is characterized in that an ink layer is provided at the heat-sealed sealed areas of both open ends of the overlapping area of the roll-up film and the non-roll-up film, which forms the roll-up allowance, thereby weakening the heat-seal strength of those areas. The food packaging bag according to claim 1, in which the ink layer is partially provided at the overlapping portion of the roll-up side film and the non-roll-up side film that forms the roll-up margin, and at the heat-sealed sealed portions of both open ends.

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