Packaging bags and packages

Abstract

To provide a package that can be easily opened without causing a split in a resin film even when stored frozen, and a packaging bag for manufacturing the package.SOLUTION: A packaging bag in which two or one folded resin films are sealed, containing; the facing surfaces of the resin films are provided with easy openness. The packaging bag has a first side and a third side facing each other, a second side and a fourth side facing each other, and a first seal part provided on the first side and a second seal part provided on the second side. The second seal part has, in order from the third side, a parallel seal part substantially parallel to the second side and an inclined seal part inclined inward of the packaging bag with respect to the second side. An end part of the inclined seal part on the first side is connected to the first seal part at a position on the fourth side of the end part on the second side of the first seal part. The other side has a seal part or a folded part so that one of the third side or the fourth side is an opening.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging bag and a packaging body. [Background technology]

[0002] Conventionally, foods such as sliced ​​ham and retort hamburger steaks are distributed as sealed packages that are placed in three-sided bags made of plastic film and sealed by closing the open end of the three-sided bag. Various measures have been taken to make such packages easier to open (for example, Patent Document 1, etc.). Many of the above-described packages are made by bonding two rectangular resin films 81 together, such as package 80 shown in Fig. 8. The two resin films 81 are bonded together by sealing their edge portions, and a seal portion 82 is formed at the edge portion. Note that the contents are omitted from Fig. 8.

[0003] In general, such packages have non-sealed portions formed at some of the corners to make them easier to open. In the case of package 80 shown in Fig. 8, a non-sealed portion is provided at the upper left corner, and the package can be opened by pinching the two resin films 81 at the non-sealed portion and pulling them in the directions indicated by the arrows in the figure. Note that non-sealed portions may also be provided at opposing corners (the upper right corner in the case of Fig. 8). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-067305 Summary of the Invention [Problem to be solved by the invention]

[0005] When opening the package 80 shown in Fig. 8, it is necessary to apply force to the sealed portion 82 so as to peel off the two resin films 81 in the non-sealed portion as described above. When a strong force is applied to peel off the entire wide sealed portion 82, lightning wrinkles may occur, and furthermore, the resin film 81 may not peel along the sealed portion 82, causing the resin film 81 to tear in an unintended direction. In particular, when the package has been stored in a frozen state, the resin film 81 has hardened, and tearing of the resin film 81 is frequent.

[0006] Therefore, an object of the present invention is to provide a package that can be easily opened without causing tears in the resin film, even if the package is made of a resin film and stored in a frozen state, and a packaging bag for producing the package. [Means for solving the problem]

[0007] The packaging bag of the present invention is as described below. A packaging bag formed by sealing two facing resin films or one folded facing resin film, The opposing surfaces of the resin film are provided with easy-open properties, The packaging bag has a first side and a third side facing each other, a second side and a fourth side facing each other, a first seal portion provided on the first side, and a second seal portion provided on the second side, The second seal portion has, in order from the third side, a parallel seal portion that is substantially parallel to the second side, and an inclined seal portion that is inclined toward the inside of the packaging bag with respect to the second side, an end portion of the inclined seal portion on the first side connected to the first seal portion at a position closer to a fourth side than an end portion of the second side of the first seal portion; The third side or the fourth side has a sealed portion or a folded portion so that either one side becomes an opening. packaging bag. [Effects of the Invention]

[0008] The present invention provides a package that can be easily opened without causing tears in the resin film even if the package is made of a resin film and stored in a frozen state, and a packaging bag for producing the package. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating an outline of an example of a packaging bag according to a first embodiment of the present invention. [Figure 2] FIG. 4 is a diagram illustrating an outline of an example of a packaging bag according to a second embodiment of the present invention. [Figure 3] FIG. 10 is a diagram illustrating an outline of an example of a packaging bag according to a third embodiment of the present invention. [Figure 4] FIG. 10 is a diagram illustrating an outline of an example of a packaging bag according to a fourth embodiment of the present invention. [Figure 5] FIG. 10 is a diagram illustrating an outline of an example of a packaging bag according to a fifth embodiment of the present invention. [Figure 6] FIG. 10 is a diagram illustrating an outline of an example of a packaging bag according to a sixth embodiment of the present invention. [Figure 7] 6 is a schematic diagram for explaining a method for opening a package using the packaging bag shown in FIG. 5. FIG. [Figure 8] FIG. 1 is a diagram illustrating an outline of a conventional packaging body. DETAILED DESCRIPTION OF THE INVENTION

[0010] The packaging bag according to the present invention is a packaging bag formed by sealing two resin films facing each other or one folded resin film facing each other. The opposing surfaces of the resin film are provided with easy-open properties. Easy-open properties refer to the property of being able to easily open the opening portion of a sealed package containing contents (easy-opening properties). Examples of such properties include adjusting the peel strength of the film, improving the ease of tearing film or paper by half-cutting or perforations, and improving the openability of metal cans by using a pull-top system; all of these are collectively referred to as easy-open properties. In the present invention, easy-open properties refer to the property of adjusting the peel strength, whereby the sealed opposing resin films are easily peeled at a specific layer (easy-open layer) located at the innermost layer.

[0011] The main surface of the packaging bag is substantially rectangular, with the first and third sides of the main surface facing each other and the second and fourth sides facing each other. A first sealed portion is formed near the first side, and a second sealed portion is formed near the second side. In addition, a sealed portion or a folded portion is formed on the third or fourth side so that either one of the sides becomes the opening of the packaging bag.

[0012] The second seal portion has, in order from the third side, a parallel seal portion and an inclined seal portion. The parallel seal portion is a portion that is approximately parallel to the second side, and the inclined seal portion is a portion that is inclined toward the inside of the packaging bag with respect to the second side. The end portion of the inclined seal portion on the first side is connected to the first seal portion at a position closer to the fourth side than the end portion of the first seal portion on the second side.

[0013] Hereinafter, a packaging bag according to an embodiment of the present invention and a package using the same will be described in detail with reference to the drawings. (First embodiment) FIG. 1 is a schematic view of an example of a packaging bag according to a first embodiment of the present invention. The packaging bag 10 shown in Figure 1 is formed by sealing two opposing resin films 11, and has opposing first and third sides 13 and 15, opposing second and fourth sides 14 and 16, a first sealed portion 13' on the first side, a second sealed portion 14' on the second side, and a fourth sealed portion 16' on the fourth side. The packaging bag 10 is a so-called three-sided bag in which the fourth sealed portion 16', first sealed portion 13', and second sealed portion 14' are connected to form an opening 12 on the third side 15. However, the configuration of the second sealed portion 14' differs from that of conventional simple three-sided bags. It should be noted that each seal portion (13', 14', 16') does not necessarily have to be formed so as to close each side (13, 14, 16) as shown in Figure 1, but may be formed closer to the center of the packaging bag than each side, and each side (end of the packaging bag) itself may not be sealed.

[0014] The second seal portion 14' has, in order from the third side, a parallel seal portion 14'a and an inclined seal portion 14'b. The parallel seal portion 14'a is formed substantially parallel to the second side 14. The inclined seal portion 14'b is formed at an angle toward the inside of the packaging bag 10 with respect to the second side 14. The end of the inclined seal portion 14'b on the first side connects to the first seal portion 13' at a position closer to the fourth side than the end of the second side of the first seal portion 13'. The inclined seal portion 14'b may be linear, but is preferably slightly curved so that the first side is convex.

[0015] Because the second seal portion 14' has the above-mentioned configuration, an approximately triangular non-sealed portion is formed in the area of ​​the packaging bag 10 surrounded by the first seal portion 13', the inclined seal portion 14'b, and the second side 14. In this substantially triangular non-sealed portion, it is preferable that the length T2 from the end of the parallel seal portion 14'a on the first side to the first seal portion 13' is longer than the length T1 from the junction of the first seal portion 13' and the inclined seal portion 14'b to the second side 14. Note that if the end of the first seal portion 13' on the second side does not reach the second side 14 (i.e., if the non-sealed portion 17 described below is present), the length T2 from the end of the parallel seal portion 14'a on the first side to the first seal portion 13' is determined assuming that the first seal portion 13' reaches the second side 14. The length T2 is longer than the length T1, so that the package in which the contents are contained in the packaging bag 10 and the opening 12 is sealed can be opened more neatly when being opened.

[0016] The inclined seal portion 14'b of the second seal portion 14' is preferably inclined at an angle of about 30° to 60° with respect to the second side 14, more preferably about 30° to 50°, and even more preferably about 30° to 40°. If the inclination angle is too small, it tends to be difficult to insert fingers between the two resin films 11. If the inclination angle is too large, the force required to open the package tends to be large. The inclination angle refers to the angle between the inclined seal portion 14'b and the second side 14.

[0017] The length of the parallel seal portion 14'a of the second seal portion is preferably 1 / 2 to 4 / 5 of the length of the second side 14 of the packaging bag, more preferably 3 / 5 to 3 / 4, and even more preferably 2 / 3 to 3 / 4. If the length of the parallel seal portion 14'a is short, the inclination angle of the inclined seal portion 14'b tends to be small, and if the length of the parallel seal portion 14'a is long, the inclination angle of the inclined seal portion 14'b tends to be large.

[0018] (Second embodiment) FIG. 2 is a schematic diagram showing an example of a packaging bag according to a second embodiment of the present invention. The packaging bag 20 shown in FIG. 2 differs from the packaging bag 10 according to the first embodiment described above in that it is made by sealing a single folded resin film 11 facing each other, and has a fourth folded portion 16″ instead of the fourth sealed portion 16′ of the packaging bag 10. Specifically, the packaging bag 20 has a first side 13 and a third side 15 facing each other, a second side 14 and a fourth side 16 facing each other, a first sealed portion 13' provided on the first side, and a second sealed portion 14' provided on the second side. Furthermore, the fourth side 16 has a fourth folded portion 16'', and the fourth folded portion 16'', the first sealed portion 13', and the second sealed portion 14' are connected to form an opening 12 on the third side 15. In packaging bag 20, second sealed portion 14' has the same configuration as that of packaging bag 10, and has, in order from the third side, parallel sealed portion 14'a and inclined sealed portion 14'b. As a result, a substantially triangular unsealed portion is formed in the area of ​​packaging bag 20 surrounded by first sealed portion 13', inclined sealed portion 14'b, and second side 14.

[0019] (Third embodiment) FIG. 3 shows a schematic view of an example of a packaging bag according to a third embodiment of the present invention. The packaging bag 30 shown in Fig. 3 is formed by sealing two opposing resin films 11, similar to the packaging bag 10. However, it differs from the packaging bag 10 according to the first embodiment in that it has a third sealed portion 15' instead of the fourth sealed portion 16'. Specifically, packaging bag 30 has opposing first and third sides 13 and 15, opposing second and fourth sides 14 and 16, a first sealed portion 13' on the first side, a second sealed portion 14' on the second side, and a third sealed portion 15' on the third side. First sealed portion 13', second sealed portion 14', and third sealed portion 15' are connected to form opening 12 on fourth side 16. In packaging bag 30, second sealed portion 14' has the same configuration as that of packaging bag 10, and has, from the third side, parallel sealed portion 14'a and inclined sealed portion 14'b. As a result, a substantially triangular unsealed portion is formed in the area of ​​packaging bag 30 surrounded by first sealed portion 13', inclined sealed portion 14'b, and second side 14.

[0020] (Fourth embodiment) FIG. 4 shows a schematic view of an example of a packaging bag according to a fourth embodiment of the present invention. The packaging bag 40 shown in FIG. 4 differs from the packaging bag 30 according to the third embodiment described above in that it is made by sealing a single folded resin film 11 facing each other, and has a third folded portion 15″ instead of the third sealed portion 15′ of the packaging bag 30. Specifically, packaging bag 40 has opposing first and third sides 13 and 15, opposing second and fourth sides 14 and 16, a first sealed portion 13' provided on the first side, and a second sealed portion 14' provided on the second side. Furthermore, third side 15 has a third folded portion 15'', and opening 12 is formed on fourth side 16 by connecting first sealed portion 13', second sealed portion 14', and third folded portion 15''. In packaging bag 40, second sealed portion 14' has the same configuration as that of packaging bag 10, and has, in order from the third side, parallel sealed portion 14'a and inclined sealed portion 14'b. As a result, a substantially triangular unsealed portion is formed in the area of ​​packaging bag 40 surrounded by first sealed portion 13', inclined sealed portion 14'b, and second side 14.

[0021] (Fifth embodiment) FIG. 5 shows a schematic view of an example of a packaging bag according to a fifth embodiment of the present invention. The packaging bag 50 shown in Figure 5 has the same basic configuration as the packaging bag 10 of the first embodiment described above, but differs in that the end of the first sealed portion 13' on the second side does not reach the second side 14, and a non-sealed portion 17 is formed between the first sealed portion 13' and the second side 14. As will be described later, the formation of the non-sealed portion 17 on the first side 13 makes it easier to open the packaging bag 50 when the contents are placed in the packaging bag 50 and the opening 12 is sealed to form a package.

[0022] (Sixth embodiment) FIG. 6 shows a schematic view of an example of a packaging bag according to a sixth embodiment of the present invention. The packaging bag 60 shown in Figure 6 has the same basic configuration as the packaging bag 50 of the fifth embodiment described above, but differs in that the width of the second seal portion 14' is narrower than the first seal portion 13' and the fourth seal portion 16', and that the parallel seal portion 14'a of the second seal portion 14' is formed inside the packaging bag 60 relative to the second side 14, and the second side 14 is not sealed. Both of the configurations listed as the two differences above have the effect of making it easier to open the packaging bag 60 when the contents are placed in the packaging bag 60 and the opening 12 is sealed to form a package.

[0023] (packaging) Fig. 7 shows an outline of a package 70, as an example of a package according to the present invention, which is obtained by placing contents in the packaging bag 50 shown in Fig. 5 and sealing the opening 12 on the third side. Note that the contents are not shown in Fig. 7.

[0024] When opening the package 70, insert your fingers between the two resin films 11 from the non-sealed portion 17 of the first side 13 and the non-sealed portion of the second side, and pinch the non-sealed portion between the inclined seal portion 14'b and the second side 14 (the portion indicated by the dashed circle in FIG. 7). Then, pull each resin film 11 in the direction indicated by the arrow in FIG. 7 to tear the two resin films 11 apart. This causes peeling to begin at a certain point in the inclined seal portion 14'b, and then a force attempting to peel the two resin films 11 can be smoothly applied along the inclined seal portion 14'b.

[0025] In the case of a conventional packaging body 80 as shown in Figure 8, the force to peel the two resin films 81 was applied and dispersed over the entire linear seal portion 82, requiring the application of a very large force, which in some cases could result in tears in the resin films 81 in unintended places. In contrast, in the case of the package 70, a finger inserted into the aforementioned approximately triangular unsealed portion is blocked by the first seal portion 13', which is located closer to the second edge than the intersection of the first seal portion 13' and the inclined seal portion 14'b. After the finger hits the inclined seal portion 14'b, a force attempting to peel the resinous film 11 is applied along the inclined seal portion 14'b toward the parallel seal portion 14'a. Therefore, if peeling occurs at a certain point on the inclined seal portion 14'b, peeling occurs smoothly from that point, preventing tearing of the resinous film 11. Furthermore, the package 70 can be opened with less force than the conventional package 80. From the perspective of reducing the force required to open the package 70 and further suppressing tearing of the resinous film 11, it is preferable that the inclined seal portion 14'b be slightly curved so that the first edge is convex, rather than being straight. This makes it easier for the finger force to be applied to the curved vertex, resulting in peeling occurring at a specific location. The above has explained the method of opening the packaging bag 50 shown in Figure 5 when contents are placed inside the bag to form the package 70. However, even if the packaging bag shown in Figures 1 to 4 and 6 is used to form a package by placing contents inside the bag and sealing the opening 12, the bag can be opened in the same way as the package 70.

[0026] The packaging body 70 has a non-sealed portion 17 (between the first sealed portion 13' and the second side 14) formed on the first side 13, which makes it easier to insert fingers between the two resin films 11 when opening the packaging body 70. From this perspective, the length of the non-sealed portion 17 is preferably about 1 / 10 to 1 / 3, more preferably about 1 / 10 to 1 / 4, and even more preferably about 1 / 10 to 1 / 5 of the length of the first side 13 of the packaging bag.

[0027] The contents to be placed in the packaging bag are not particularly limited, and various refrigerated foods such as prepared foods or frozen foods can be selected. Furthermore, the material of the resin film 11 is not particularly limited, and any resin film such as a plastic film that can be used for conventional packaging bags for prepared foods, cooked rice, soup, etc. can be used. If the resin film is a laminated film, it is sufficient that at least the innermost layer (the layer that will become the inner surface of the packaging bag) is made easy-open. Of course, the resin film may also be a single-layer film made easy-open. The method for sealing the resin film 11 is not particularly limited, and various conventional methods such as heat sealing can be used.

[0028] The following describes embodiments of the packaging bag and packaging body of the present invention. (1) A packaging bag made by sealing two facing resin films or one folded facing resin film, The opposing surfaces of the resin film are provided with easy-open properties, The packaging bag has a first side and a third side facing each other, a second side and a fourth side facing each other, a first seal portion provided on the first side, and a second seal portion provided on the second side, The second seal portion has, in order from the third side, a parallel seal portion that is substantially parallel to the second side, and an inclined seal portion that is inclined toward the inside of the packaging bag with respect to the second side, an end portion of the inclined seal portion on the first side connected to the first seal portion at a position closer to a fourth side than an end portion of the second side of the first seal portion; The third side or the fourth side has a sealed portion or a folded portion so that either one side becomes an opening. packaging bag. (2) A fourth seal portion or a fourth folded portion is provided on the fourth side, and an opening is provided on the third side. The packaging bag described in (1) above. (3) A third seal portion or a third folded portion is provided on the third side, and an opening is provided on the fourth side. The packaging bag described in (1) above. (4) The end of the first seal portion on the second side is not connected to the second side, thereby forming a non-sealed portion on the first side. The packaging bag according to any one of (1) to (3) above. (5) The length from the end of the parallel seal portion on the first side to the first seal portion is longer than the length from the contact point between the first seal portion and the inclined seal portion to the second side. The packaging bag according to any one of (1) to (4) above. (6) The inclined seal portion is curved so that the first side is convex. The packaging bag according to any one of (1) to (5) above. (7) The parallel seal portion is formed inside the second side. The packaging bag according to any one of (1) to (6) above. (8) The length of the non-sealed portion formed between the end of the first sealed portion on the second side and the second side is 1 / 10 to 1 / 3 of the length of the first side. The packaging bag according to any one of (4) to (7) above. (9) The length of the parallel seal portion is 1 / 2 to 4 / 5 of the length of the second side. The packaging bag according to any one of (1) to (8) above. (10) A package in which contents are accommodated in the packaging bag according to any one of (1) to (9) above. [Example]

[0029] The present invention will be explained in more detail below by way of examples, but the present invention is not limited to the contents of these examples.

[0030] Example 1 A packaging bag 60 as shown in FIG. 6 was prepared. The resin film 11 used was an OPP / / easy-open film manufactured by Mitsui Chemicals Tocello Co., Ltd., and each seal was formed by heat sealing. The length of the non-sealed portion 17 between the end of the first sealed portion 13' on the second side and the second side 14 was 1 / 8 of the length of the first side 13 of the packaging bag 60. In addition, the length of the parallel sealed portion 14'a of the second sealed portion 14' was 3 / 4 of the length of the second side 14 of the packaging bag 60. Furthermore, Chinese side dishes were placed in the packaging bag 60 as the contents, and the opening 12 on the third side 15 was heat-sealed to obtain a package A.

[0031] (Comparative Example 1) A conventional package 80 (package B) was produced as shown in Fig. 8. The resin film 11 used was an OPP / / easy-open film manufactured by Mitsui Chemicals Tohcello Co., Ltd., as in Example 1, and each seal was formed by heat sealing. The contents were Chinese side dishes, as in Example 1.

[0032] <Evaluation> The packaging body A produced in Example 1 and the packaging body B produced in Comparative Example 1 were kept at -10°C for 10 hours, and then opened and evaluated for the occurrence of tears in the resin film 11. Twenty pieces each of the packaging body A and the packaging body B were prepared and evaluated. As a result, none of the packages A had any tears in the resin film 11, and all of them could be easily opened. On the other hand, in the package B, tears occurred in the resin film 11 in 18 pieces. [Explanation of symbols]

[0033] 10. Packaging bag according to the first embodiment of the present invention 11 Resin film 12 Opening 13 First Side 13' First seal part 14 Second Side 14' Second seal section 14'a Parallel seal part 14'b Inclined seal section 15 Third Side 15' 3rd seal part 15” 3rd fold 16 Fourth Side 16' 4th seal part 16” 4th fold 17 Non-sealed part 20 Packaging bag according to the second embodiment of the present invention 30 Packaging bag according to the third embodiment of the present invention 40 Packaging bag according to the fourth embodiment of the present invention 50 Packaging bag according to the fifth embodiment of the present invention 60 Packaging bag according to the sixth embodiment of the present invention 70 Packaging according to an embodiment of the present invention 80 Conventional packaging 81 Resin film 82 Seal part

Claims

1. A packaging bag formed by sealing two facing resin films or one folded facing resin film, The opposing surfaces of the resin film are provided with easy-open properties, The packaging bag has a first side and a third side facing each other, a second side and a fourth side facing each other, a first seal portion provided on the first side, and a second seal portion provided on the second side, The second seal portion has, in order from the third side, a parallel seal portion that is substantially parallel to the second side and an inclined seal portion that is inclined toward the inside of the packaging bag with respect to the second side, an end portion of the inclined seal portion on the first side connected to the first seal portion at a position closer to a fourth side than an end portion of the first seal portion on the second side, the third side or the fourth side has a sealed portion or a folded portion so that the other side becomes an opening; packaging bag.

2. a fourth seal portion or a fourth folded portion on the fourth side, and an opening on the third side; The packaging bag according to claim 1.

3. a third seal portion or a third folded portion on the third side, and an opening on the fourth side; The packaging bag according to claim 1.

4. an end portion of the first sealed portion on the second side is not connected to the second side, thereby forming a non-sealed portion on the first side; The packaging bag according to any one of claims 1 to 3.

5. a length from an end of the parallel seal portion on the first side to the first seal portion is longer than a length from a contact point between the first seal portion and the inclined seal portion to the second side; The packaging bag according to any one of claims 1 to 4.

6. The inclined seal portion is curved so that the first side is convex. The packaging bag according to any one of claims 1 to 5.

7. The parallel seal portion is formed inside the second side. The packaging bag according to any one of claims 1 to 6.

8. the length of the non-sealed portion formed between the end of the first sealed portion on the second side and the second side is 1 / 10 to 1 / 3 of the length of the first side; The packaging bag according to any one of claims 4 to 7.

9. The length of the parallel seal portion is 1 / 2 to 4 / 5 of the length of the second side. The packaging bag according to any one of claims 1 to 8.

10. A package in which contents are accommodated in the packaging bag according to any one of claims 1 to 9.

Images