Food packaging bags

Abstract

To make a turnup side film easily peeled when opening the bag by turning up the side.SOLUTION: A food packaging bag is formed of a film base in which: a turnup side film 2 and a non-turnup side film 1 are joined, with one end of the turnup side film and one end of the non-turnup side film overlapping each other; the joint is made by a heat seal line S1 traversing in a width direction, with the leading end of a turnup side film left as a turnup margin 3 for opening; the other ends thereof are butted and joined by heat sealing; the left and right open edges of both the films are sealed by heat sealing; and the overlapping portion is formed of a turnup side film serving as the turnup margin and the non-turnup side film of the food packaging bag, and ink layers 6 are provided in sealed areas formed by heat sealing both the open edges, so as to weaken heat seal strength of the areas.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a food packaging bag for containing solid foods such as rice balls, sushi, sandwiches, etc. [Background technology]

[0002] 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 bag, but to open part of the packaging bag to expose the food, and then hold the food through the packaging bag while leaving the food in the remaining part, allowing you to eat the food without getting your hands dirty.

[0003] A known food packaging bag as described above 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 effected 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 for opening, the other ends being butted together in a palm-to-palm manner and joined by heat sealing, and both left and right open ends of both films are sealed by heat sealing (Patent Document 1).

[0004] 12 to 19 are diagrams for explaining the food packaging bag. This food packaging bag is manufactured by the following process.

[0005] 12 and 13 are diagrams showing a film substrate Y constituting a food packaging bag. This film substrate Y is composed of a synthetic resin film that is joined to a turn-up side film 12 and a non-turn-up side film 11. The two films are joined with one end overlapping each other, and at this time, the tip of the turn-up side film 12 is left as a turn-up allowance 13 for opening, and the films are joined at a position set back from the tip of the turn-up side film by a heat seal line S10 that runs vertically across the width.

[0006] 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 FIG. 14). Next, one open end of the tube is sealed by a heat seal line S20 to form a bag (see FIGS. 15 and 16).

[0007] Next, food F is placed inside the tube from the other open end (see FIG. 17), and the other open end is sealed with a heat seal line S30 (see FIG. 18), and in this state the product is put into distribution as a packaged food.

[0008] When a purchaser of the packaged food item pinches and rolls up the roll-up margin 13 of the roll-up film 12, the seals on both sides of the bag, which have been bonded by seal lines S20, S30, and the bond between the roll-up film and the non-roll-up film, which have been bonded by heat seal line S10, are released, and the roll-up film is rolled up significantly relative to the non-roll-up film enclosing the food F, exposing part of the food (see Figure 19).

[0009] In the actual production of the food packaging bags, the film substrate Y is produced in a continuous, long shape in the width direction, which is wound up on a supply roll, and the film substrate supplied from the supply roll is cut into 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 portions, when the film substrate is wound up, the thickness of the central portion where the overlapping portions are located and the thickness of the left and right portions will be uneven, resulting in an uneven winding diameter and the risk of wrinkles or the like.

[0010] For this reason, strip-shaped balance tapes 15, 14 having heat sealability are arranged to be bonded to the surface of the film 12 to be rolled up, which will become the inside of the bag when the bag is made, and to the film 11 not to be rolled up. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Patent No. 5764280 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0012] In the conventional technology described above, both ends of the turn-over margin 13 of the turn-over film 12 (areas surrounded by circles S in Figs. 15 to 18) are strongly adhered to the bag by heat seal lines S20, S30 that seal the open ends of the bag.

[0013] As a result, when the package is opened by pinching the turn-over margin 13 of the turn-over film 12 and peeling it away while turning it over, the turn-over margin 13 creates resistance, making it difficult to peel the package away.

[0014] To solve the above problem, both ends of the turn-up margin 13 of the turn-up side film 12 could be prevented from being glued. However, this would cause the turn-up margin to move freely during distribution and be turned up accidentally, resulting in the bond at the heat seal line S10 coming apart. [Means for solving the problem]

[0015] The present invention has been made with the objective of providing a food packaging bag which overcomes the above-mentioned problems.

[0016] 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.

[0017] In addition, the invention described in claim 2 is characterized in that, in the above-mentioned 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, which forms the roll-up allowance, at the sealed areas by heat sealing at both open ends. Effect of the Invention

[0018] In the food packaging bag of the present invention having the above-mentioned configuration, an ink layer is provided at the overlapping portion of the roll-up side film and the non-roll-up side film, and at the heat-sealed sealed areas at both open ends, thereby weakening the heat-seal strength at those areas, thereby reducing the resistance when opening the bag by pinching the roll-up margin of the roll-up side film and pulling it apart while rolling it up.

[0019] On the other hand, since both ends of the turnover margin of the turnover side film are glued, there is no risk of the turnover margin moving freely during distribution and being turned over accidentally, causing the bond of the heat seal line to come off. [Brief description of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view of a food packaging bag according to the present invention in an unfolded state. [Diagram 2] FIG. [Diagram 3] Same as above, cross-sectional view. [Figure 4] Same as above, cross-sectional view of the process of use. [Diagram 5] Same as above, cross-sectional view of the opening process. [Figure 6] Same as above, cross-sectional view of the opening process. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10]FIG. [Figure 11] FIG. [Figure 12] FIG. 1 is a cross-sectional view of a conventional food packaging bag in an unfolded state. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] Same as above, cross-sectional view of the bag making process. [Figure 17] FIG. [Figure 18] FIG. [Figure 19] FIG. BEST MODE FOR CARRYING OUT THEINVENTION

[0021] Specific examples of the present invention will be described below with reference to the accompanying drawings. Here, a food packaging bag for packaging rice balls will be used as an example. 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 the other, and the joining is performed by a heat seal line running vertically across the width 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 over a known food packaging bag.

[0022] 1 to 11 are diagrams illustrating the food packaging bag of the present invention. This food packaging bag is manufactured by the following steps.

[0023] 1 and 2 are diagrams showing a film substrate X before it is made into a packaging bag. This film substrate Y is made by joining a synthetic resin film 2 to be turned over and a non-turning film 1, and here, a PP film with an easy-to-open seal property 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 turning-over film 2 is left as a turning allowance 3 for opening, and the film is joined at a position retreated from the tip of the turning-over film by a heat seal line S1 running vertically in the width direction.

[0024] An ink layer 6 is printed on both ends of the non-turn-up side film 1 of the film substrate X where the turn-up margin 3 of the turn-up side film 2 overlaps (area surrounded by a circle T in Figs. 8 to 10). This ink layer 6 is for weakening 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.

[0025] In the manufacture of the food packaging bags, the film substrate Y is manufactured in a continuous, long shape in the width direction, and is printed with letters and patterns, wound up on a supply roll, and cut out from the supply roll to 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 portions, when the film substrate is wound up, the thickness of the central portion where the overlapping portions are located will be uneven from the left and right portions, resulting in an uneven winding diameter, which may cause wrinkles, etc.

[0026] For this reason, strip-shaped balance tapes 5, 4 having heat sealability are arranged to be bonded to the surface of the roll-up film 2 that will become the inside of the bag when the bag is made, and to the non-roll-up film 1. Of these, the strip-shaped balance tape 5 that is bonded to 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 part 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 part 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).

[0027] The film substrate X is folded into a cylindrical shape, and the other ends 1A, 2A are butted together in a folded state and joined by heat sealing (see FIG. 3). At this time, the balance tape 5 adhered to the above-mentioned turning-up side film 2 is arranged so that a part 5A in the width direction is located at the joining point between the turning-up side film and the non-turning side film, so that the balance tape 5 is sandwiched and adhered between the joining point 2A of the turning-up side film and the joining point 1A of the non-turning side film at the joining point, and is prevented from being pulled by the overlapping turning-up side film and peeled off when the package is opened.

[0028] One open end of the cylindrical film substrate X is sealed along a heat seal line S2 to form a bag (see FIG. 5).

[0029] Next, food F is placed inside the tube from the other open end (see FIG. 9), and the other open end is sealed with a heat seal line S3 (see FIG. 10), and in this state the product is put into distribution as a packaged food.

[0030] When a purchaser of the packaged food product pinches and rolls up the roll-up margin 3 of the roll-up film 2 and pulls it apart, the seals on both sides of the bag, which have been bonded together by seal lines S2 and S3, and the bond between the roll-up film and the non-roll-up film, which have been bonded together by heat seal line S1, are released, and the roll-up film is rolled up significantly relative to the non-roll-up film enclosing the food F, exposing part of the food (see Figures 5, 6 and 11).

[0031] 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, without removing the food from the packaging bag, and holding the food through the packaging bag while leaving the food in the remaining part. [Explanation of symbols]

[0032] X Film Base 1 Non-turning side film 1A Non-rolling side film joining point 2 Top flip film 2A side film folding point 3 Turning allowance 4 Balance Tape 5 Balance Tape 5A Part of the balance tape in the width direction 6 Ink Layer S1 Heat seal wire S2 Heat seal wire S3 Heat seal wire F Food

Claims

1. 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 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 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.

2. 2. The food packaging bag according to claim 1, wherein the ink layer is partially provided at the overlapping portion of the film to be rolled up and the film not to be rolled up, which is the portion to be rolled up and the heat-sealed portions of both open ends.

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