Packaging bags

Abstract

To provide a packaging bag that can be torn open at an appropriate position during opening. 【Solution means】A packaging bag having a front film with a first orientation direction and a back film with a second orientation direction different from the first orientation direction, wherein the front film has one or more linear front laser processing portions along the opening direction, and the back film has two or more straight back laser processing portions along the opening direction.

Description

[Technical field]

[0001] This device uses a laser-processed area to guide the cutting direction of a packaging bag when it is opened. [Background technology]

[0002] Conventionally, Patent Documents 1 and 2 are known.

[0003] Patent Document 1 discloses a polyolefin film bag having special tearability, characterized in that the bag is made of a stretched polyolefin film and the maximum orientation axes of the front and back films cross each other.

[0004] Patent Document 2 discloses an easy-open sealed bag made of biaxially stretched plastic in which a tear initiation portion is provided at the fused portion and the orientation directions of the front and back surfaces are opposite, characterized in that when the back surface at the tear initiation portion has an orientation in the "K" shape, a marking is provided instructing the user to pinch the right end portion and pull it towards themselves. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 5-147659 [Patent Document 2] Japanese Patent Application Publication No. 1-111664 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, Patent Documents 1 and 2 aim to grasp the orientation of the film and open it in a way that utilizes or offsets it, thereby providing a step or indicating the opening direction. However, the orientation direction of the film used in these packages cannot always be fully controlled, and there are cases where reproducibility is low or the film is torn excessively in the direction along the orientation.

[0007] The present invention has been made in consideration of the above-mentioned problems in the conventional art, and has an object to provide a packaging bag or the like that can be opened by tearing at an appropriate position when opening. [Means for solving the problem]

[0008] As a result of intensive research to solve the above problems, the inventor of the present invention found that the following invention meets the above object, and arrived at the present invention.

[0009] <a1>a front film having a first orientation direction; A packaging bag having a back film having a second orientation direction different from the first orientation direction, The front film has one or more linear front laser processed portions along the opening direction, A packaging bag, wherein the back film has two or more linear back laser processed portions along the opening direction. <a2>A tear initiation portion is provided between the rear laser processed portions of the side portions, A resealing portion is provided below the front side laser processed portion and the back side laser processed portion. <a1>The packaging bag described in. <a3>The front side laser processed portion has two linear laser processed portions, and the back side laser processed portion has two linear laser processed portions, The front side laser processing portion and the rear side laser processing portion do not overlap in position, or the front side laser processing portion and the rear side laser processing portion overlap in position. <a1>or <a2>The packaging bag described in. <a4>The front side laser processing portion has one linear laser processing portion, and the back side laser processing portion has two linear laser processing portions, The tear initiation portion is provided at an end of the front side laser processed portion. <a2>The packaging bag described in. <a5>The front film and the back film each have a layer of a stretched film selected from the group consisting of stretched polypropylene, stretched polyester, and stretched nylon; The front side laser processed portion and the back side laser processed portion are provided directly on each layer of the stretched film, The front film and the back film are overlapped and pasted together on all four sides to form a sealed state. <a1> ~ <a4>13. A packaging bag according to any one of the preceding claims. <a6>A step of providing a laser processing section for a front side and a laser processing section for a back side while transporting a strip-shaped bag film that has been stretched and has an orientation direction; A step of dividing the belt-shaped bag film into a front film and a back film while conveying the bag film; A process of conveying the front side film and the back side film in a strip shape, superimposing the front side laser processing section as a front side laser processing section and the back side laser processing section as a back side laser processing section at corresponding positions; and laminating the front film and the back film together, and then cutting the resulting product.

[0010] <b1>A packaging bag in which a stretched film (1) has a left orientation (arrow A, arrow A, arrow A), a downward orientation (arrow B) on a front surface (2) and an upward orientation (arrow C) on a back surface (3), the front surface (2) is processed with two straight laser lines (4, 4) to form the downward orientation (arrow B) on the front surface (2), and the back surface (3) is processed with two straight laser lines (5, 5) to form the upward orientation (arrow C) on the back surface (3). <b2>The two straight lasers (4, 4) are processed, the front surface (2) is provided with the lower orientation (arrow B), the two straight lasers (5, 5) are processed, the back surface (3) is provided with the upper orientation (arrow C), and a step (6) is provided. <b1>Packaging bag. <b3>A packaging bag in which a stretched film (1) has a right-side orientation (arrow D, arrow D, arrow D), an upper orientation (arrow E) on a front surface (2) and a lower orientation (arrow F) on a back surface (3), the front surface (2) is processed with two straight laser lines (4, 4) to form the upper orientation (arrow E) on the front surface (2), and the back surface (3) is processed with two straight laser lines (5, 5) to form the lower orientation (arrow F) on the back surface (3). <b4>The two straight lasers (4, 4) are processed, the front surface (2) is provided with the upper orientation (arrow E), the two straight lasers (5, 5) are processed, the back surface (3) is provided with the lower orientation (arrow F), and a step (7) is provided. <b3>Packaging bag. <b5>When excessive force is applied, the stretched film (1) is provided with a downward orientation (arrow B), and the two straight lasers (4, 4) are processed, and when excessive force is applied to the downward orientation (arrow B) to open the bag (orientation is ignored), the front surface (2) is configured with the downward orientation (arrow B), and the two straight lasers (5, 5) are processed, and when excessive force is applied to the downward orientation (arrow B) to open the bag (orientation is ignored), the back surface (3) is provided with the downward orientation (arrow B), and a step (8) is provided to form a packaging bag. <b6>The two straight lasers (4, 4) are processed, the front surface (2) is provided with the downward orientation (the arrow B), the two straight lasers (5, 5) are processed, the back surface (3) is provided with the downward orientation (the arrow B), and a step (8) is provided. <b5>Packaging bag. <b7>When excessive force is applied, the stretched film (1) is provided with an upward orientation (arrow C) and an upward orientation (arrow C) that is not aligned with the orientation, and the two straight lasers (4,4) are processed, and when excessive force is applied to the upward orientation (arrow C) (orientation is ignored), the surface (2) is configured with the upward orientation (arrow C), and two straight lasers (5,5) are processed, and when excessive force is applied to the upward direction (arrow C), the back surface (3) is provided with the upward orientation (arrow C), and when excessive force is applied to the bag opening (orientation is ignored), the surface (2) is provided with the upward orientation (arrow C), and a step (9) is provided. <b8>The two straight lasers (4, 4) are processed, the front surface (2) is provided with the upward orientation (the arrow C), the two straight lasers (5, 5) are processed, the back surface (3) is provided with the upward orientation (the arrow C), and a step (9) is provided. <b7>Packaging bag. Effect of the Invention

[0011] The packaging bag of the present invention can be opened by tearing it at the appropriate location. [Brief description of the drawings]

[0012] [Figure 1] In the packaging bag, (a) is a front view, and (b) is a front view and a back view. [Diagram 2] In the packaging bag, (a) is a front view, and (b) is a front view and a back view. [Diagram 3] In the packaging bag, (a) is a front view and (b) is a back view. [Figure 4] In the packaging bag, (a) is a front view and (b) is a back view. [Diagram 5] In the packaging bag, (a) is a front view and (b) is a back view. [Figure 6] In the packaging bag, (a) is a front view and (b) is a back view. [Figure 7] 1 is a diagram showing an example of an embodiment of a packaging bag according to the present invention. [Figure 8] FIG. 2 is a diagram showing another example of an embodiment of the packaging bag of the present invention. [Figure 9] 1 is a diagram showing an example of an embodiment of a manufacturing method for a packaging bag of the present invention. [Figure 10] 4 is a diagram showing an example of a laser processed portion of a packaging bag according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The embodiment of the present invention will be described in detail below, but the description of the constituent elements described below is one example (representative example) of the embodiment of the present invention, and the present invention is not limited to the following content as long as the gist of the invention is not changed. In addition, when the expression "~" is used in this specification, it is used as an expression including the numerical values ​​before and after it.

[0014] [Packaging bag of this invention] The packaging bag of the present invention is a packaging bag having a front film having a first orientation direction and a back film having a second orientation direction different from the first orientation direction, wherein the front film has one or more linear front laser-processed portions along the opening direction, and the back film has two or more linear back laser-processed portions along the opening direction.

[0015] [Manufacturing method according to the present invention] The manufacturing method of the present invention is a method for manufacturing packaging bags, which includes the steps of: providing a laser-processed section for the front side and a laser-processed section for the back side while transporting a strip-shaped bag film that has been stretched and has an orientation direction; separating the strip-shaped bag film into a film for the front side and a film for the back side while transporting the film for the front side and the film for the back side while transporting them in a strip-like shape, overlapping the film for the front side and the film for the back side in corresponding positions with the laser-processed section for the front side as the front side laser processing section and the laser-processed section for the back side as the back side laser processing section; and bonding the film for the front side and the film for the back side together and cutting them out.

[0016] In addition, the packaging bag of the present invention can be obtained by the manufacturing method of the present invention in the present application, and the corresponding configurations in the present application can be used mutually.

[0017] The present invention can be the following first to eighth aspects. First, the stretched film (1) has a left orientation (arrow A, arrow A, arrow A), a downward orientation (arrow B) on the front side (2) and an upward orientation (arrow C) on the back side (3), the front side (2) is processed with two straight laser lines (4, 4) to form the downward orientation (arrow B) on the front side (2), and the back side (3) is processed with two straight laser lines (5, 5) to form the upward orientation (arrow C) on the back side (3), thereby forming a packaging bag.

[0018] The stretched film (1) (longitudinal MD and transverse TD) has the left orientation (arrow A, arrow A, arrow A), the front surface (2) and the back surface (3) have different left orientations (arrow A, arrow A, arrow A), the lower orientation (arrow B) of the front surface (2) and the upper orientation (arrow C) of the back surface (3). When the bag is opened (front surface (2) and back surface (3)), separation occurs. The two straight lasers (4, 4) are processed, the front surface (2) has a "2 mm" lower orientation (arrow B) (cutting direction is the lower orientation (arrow B)), and the two straight lasers (5, 5) are processed, and the back surface (3) has a "4 mm" upper orientation (arrow C) (cutting direction is the upper orientation (arrow C)). In this case, a "3 mm" step (6) is formed.

[0019] Secondly, the first packaging bag is configured such that the two straight lasers (4, 4) are processed, the front surface (2) is provided with the downward orientation (arrow B), the two straight lasers (5, 5) are processed, the back surface (3) is provided with the upward orientation (arrow C), and a step (6) is provided.

[0020] The two straight lasers (4, 4) are processed, the front surface (2) is provided with “2 mm” in the downward orientation (arrow B), the two straight lasers (5, 5) are processed, and the back surface (3) is provided with “4 mm” in the upward orientation (arrow C) and the step (6) of “3 mm” is provided.

[0021] Thirdly, the stretched film (1) has a right-side orientation (arrow D, arrow D, arrow D), an upper orientation (arrow E) on the front side (2) and a lower orientation (arrow F) on the back side (3), the front side (2) is processed with two straight laser lines (4, 4) to form the upper orientation (arrow E) on the front side (2), and the back side (3) is processed with two straight laser lines (5, 5) to form the lower orientation (arrow F) on the back side (3), thereby forming a packaging bag.

[0022] The stretched film (1) (machine direction MD, transverse direction TD) has the right orientation (arrow D, arrow D, arrow D), the front surface (2) and the back surface (3) have the right orientation (arrow D, arrow D, arrow D), and the top orientation (arrow E) of the front surface (2) and the bottom orientation (arrow F) of the back surface (3) are different. When the bag is opened (front surface (2) and the back surface (3)), separation occurs. The two straight lasers (4, 4) are processed, the front surface (2) has a "2 mm" top orientation (arrow E) (cutting direction is the top orientation (arrow E)), and the two straight lasers (5, 5) are processed, and the back surface (3) has a "4 mm" bottom orientation (arrow F) (cutting direction is the top orientation (arrow F)). In this case, a "3 mm" step (7) is created.

[0023] Fourth, a third packaging bag is configured such that the two straight laser lines (4, 4) are processed, the front surface (2) is provided with the upward orientation (arrow E), the two straight laser lines (5, 5) are processed, the back surface (3) is provided with the downward orientation (arrow F), and a step (7) is provided.

[0024] The two straight lasers (4, 4) are processed, the front surface (2) is provided with “2 mm” in the downward orientation (arrow E), the two straight lasers (5, 5) are processed, and the back surface (3) is provided with “4 mm” in the upward orientation (arrow F) and the step (7) of “3 mm” is provided.

[0025] Fifth, when excessive force is applied, the stretched film (1) is provided with a downward orientation (arrow B), and the two straight lasers (4, 4) are processed, and when excessive force is applied to the downward orientation (arrow B) to open the bag (orientation is ignored), the front surface (2) is configured with the downward orientation (arrow B), and the two straight lasers (5, 5) are processed, and when excessive force is applied to the downward orientation (arrow B) to open the bag (orientation is ignored), the back surface (3) is provided with the downward orientation (arrow B), and a step (8) is provided, resulting in a packaging bag.

[0026] When excessive force is applied, the stretched film (1) is oriented downward (arrow B), and the two straight lasers (4,4) are processed, and "2 mm" is provided, and the bag opening (ignoring orientation) where excessive force is applied to the downward orientation (arrow B) is configured, the front surface (2) is configured with the downward orientation (arrow B), and the two straight lasers (5,5) are processed, and "4 mm" is provided, and the bag opening (ignoring orientation) where excessive force is applied to the downward orientation (arrow B) is configured, the back surface (3) is configured with the downward orientation (arrow B). In this case, a packaging bag having a step (8) of "1 mm" or more is configured.

[0027] Sixth, a fifth packaging bag is configured such that the two straight laser lines (4, 4) are processed, the front surface (2) is provided with the upward orientation (arrow B), the two straight laser lines (5, 5) are processed, the back surface (3) is provided with the downward orientation (arrow B), and a step (8) is provided.

[0028] If excessive force is applied, the stretched film (1) may not be aligned with the downward orientation (arrow B). The two straight lasers (4, 4) are processed, and when excessive force is applied to the downward orientation (arrow B), the bag opening (ignoring orientation) is performed, and the front surface (2) is cut in the downward orientation (arrow B) by "2 mm" (the cut direction is the downward orientation (arrow B)). The two straight lasers (5, 5) are processed, and when excessive force is applied to the downward direction (arrow B), the back surface (3) is cut in the downward orientation (arrow B) by "4 mm" (the cut direction is the downward orientation (arrow B). In this case, a step (8) of "1 mm" or more is created.

[0029] Seventh, when excessive force is applied, the stretched film (1) is provided with an upward orientation (arrow C) and an upward orientation (arrow C) that is not aligned with the orientation, and the two straight lasers (4,4) are processed, and when excessive force is applied to the upward orientation (arrow C) (orientation is ignored), the surface (2) is configured with the upward orientation (arrow C), and two straight lasers (5,5) are processed, and when excessive force is applied to the upward direction (arrow C), the back surface (3) is provided with the upward orientation (arrow C), and when excessive force is applied to the bag (orientation is ignored), the surface (2) is provided with the upward orientation (arrow C), and a step (9) is provided, resulting in a packaging bag.

[0030] If excessive force is applied, the stretched film (1) may not follow the upward orientation (arrow C) and the upward orientation (arrow C). The two straight lasers (4, 4) are processed, and bag opening (ignoring orientation) where excessive force is applied to the upward orientation (arrow C) will result in the front surface (2) being cut by 2 mm (the cut direction is the upward orientation (arrow C)) of the upward orientation (arrow C), and the two straight lasers (5, 5) are processed, and bag opening (ignoring orientation) where excessive force is applied to the upward orientation (arrow C) will result in the back surface (3) being cut by 4 mm (the cut direction is the upward orientation (arrow C). In this case, a step (9) of 1 mm or more will be created.

[0031] Eighth, a seventh packaging bag is configured such that the two straight lasers (4, 4) are processed, the front surface (2) is provided with the upward orientation (the arrow C), the two straight lasers (5, 5) are processed, the back surface (3) is provided with the upward orientation (the arrow C), and a step (8) is provided.

[0032] The two straight lasers (4, 4) are processed, and when an excessive amount is added to the upper orientation (arrow C) to open the bag (ignoring orientation), the surface (2) is "2 mm" in the upper orientation (arrow C) (the cutting direction is the upper orientation (arrow C)), the two straight lasers (5, 5) are processed, and when an excessive amount is added to the upper direction (arrow C) to open the bag (ignoring orientation), the back surface (3) is "4 mm" in the upper orientation (arrow C), and when an excessive amount is added to open the bag (ignoring orientation), the surface (2) is "1 mm" in the upper orientation (arrow C) (the cutting direction is the lower orientation (arrow C)), ignoring this, a step (9) of "1 mm" or more is provided in the packaging bag.

[0033] As described above, in the present invention, the stretched film (1) (longitudinal MD and transverse TD) has the left orientation (arrow A, arrow A, arrow A), the front surface (2) and the back surface (3) have the left orientation (arrow A, arrow A, arrow A), the lower orientation (arrow B) of the front surface (2) and the upper orientation (arrow C) of the back surface (3) are different. When the bag is opened (the front surface (2) and the back surface (3)), separation occurs. The two straight lasers (4, 4) are processed, the front surface (2) has the lower orientation (arrow B) of "2 mm" (cutting direction is the lower orientation (arrow B)), the two straight lasers (5, 5) are processed, and the back surface (3) has the upper orientation (arrow C) of "4 mm" (cutting direction is the upper orientation (arrow C)). In this case, a step (6) of "3 mm" is provided.

[0034] The two straight lasers (4, 4) are processed, the front surface (2) is “2 mm” in the downward orientation (arrow B), the two straight lasers (5, 5) are processed, and the back surface (3) is “4 mm” in the upward orientation (arrow C), and the step (6) of “3 mm” is provided.

[0035] The stretched film (1) (longitudinal MD and transverse TD) has the right orientation (arrow D, arrow D, arrow D), the front surface (2) and the back surface (3) have the right orientation (arrow D, arrow D, arrow D), and the top orientation (arrow E) of the front surface (2) and the bottom orientation (arrow F) of the back surface (3) are different. When the bag is opened (front surface (2) and the back surface (3)), separation occurs. The two straight lasers (4, 4) are processed, the front surface (2) has a "2 mm" downward orientation (arrow E) (cutting direction is the downward orientation (arrow E)), and the two straight lasers (5, 5) are processed, and the back surface (3) has a "4 mm" upward orientation (arrow F) (cutting direction is the upward orientation (arrow F)). In this case, a "3 mm" step (7) is provided.

[0036] The two straight lasers (4, 4) are processed, and the front surface (2) has a step of "2 mm" in the downward orientation (arrow E), and the two straight lasers (5, 5) are processed, and the back surface (3) has a step of "4 mm" in the upward orientation (arrow F), creating the step (7) of "3 mm".

[0037] If excessive force is applied, the stretched film (1) may not follow the downward orientation (arrow B) and the downward orientation (arrow B). The two straight lasers (4, 4) are processed, and bag opening (ignoring orientation) in which excessive force is applied to the downward orientation (arrow B) is performed on the front surface (2) at "2 mm" in the downward orientation (arrow B) (cut direction is the downward orientation (arrow B)), and the two straight lasers (5, 5) are processed, and bag opening (ignoring orientation) in which excessive force is applied to the downward direction (arrow B) is performed on the back surface (3) at "4 mm" in the downward orientation (arrow B) (cut direction is the downward orientation (arrow B). In this case, a step (10) of "1 mm" or more is provided.

[0038] In Fig. 1(a), the stretched film 1 (machine direction MD and transverse direction TD) is oriented leftward (arrow A, arrow A, arrow A), and the front surface 2 and back surface 3 are oriented leftward (arrow A, arrow A, arrow A), and in Fig. 1(b), the front surface 2 is oriented downward (arrow B) and the back surface 3 is oriented upward (arrow C). When the bag is opened (front surface 2 and back surface 3), separation occurs (see Fig. 1(b)).

[0039] In Fig. 2(a), the stretched film 1 (machine direction MD and transverse direction TD) is oriented to the right (arrow D, arrow D, arrow D), and the front surface 2 and the back surface 3 are oriented to the right (arrow D, arrow D, arrow D), while in Fig. 2(b), the front surface 2 is oriented upward (arrow E) and the back surface 3 is oriented downward (arrow F). When the bag is opened (front surface 2 and back surface 3), separation occurs (see Fig. 2(b)).

[0040] In Fig. 3(a)(b) (see Fig. 1(b)), two straight lasers 4, 4 are processed, and in Fig. 3(a), the front surface 2 is processed with "2 mm" (cut direction: the downward direction (arrow B)) in the downward direction (arrow B), and two straight lasers 5, 5 are processed, and in Fig. 3(b), the back surface 3 is processed with "4 mm" (cut direction: the upward direction (arrow C)) in the upward direction (arrow C). In this case, a "3 mm" step 6 is formed (see Fig. 3(a)(b)). In Fig. 3(a)(b), a notch 12 is provided.

[0041] In Fig. 4(a)(b) (see Fig. 2(b)), the two straight lasers 4, 4 are processed, and in Fig. 4(a), the front surface 2 is processed by the two straight lasers 5, 5 in the upward orientation (arrow E) (cut direction is the upward orientation (arrow E)), and in Fig. 4(b), the back surface 3 is processed by the two straight lasers 5, 5 in the downward orientation (arrow F) (cut direction is the downward orientation (arrow F)). In this case, a step 7 of "3 mm" is formed (see Fig. 4(a)(b)). In Fig. 4(a)(b), the notch 12 is provided.

[0042] In Figures 5(a) and 5(b), if excessive force is applied, the stretched film 1 may not follow the downward orientation (arrow B) and the downward orientation (arrow B). In Figure 5(a), the two straight lasers 4, 4 are processed, and in Figure 5(a), the bag opening (ignoring orientation) with excessive force applied to the downward orientation (arrow B) is "2 mm" on the surface 2 of the downward orientation (arrow B) (cut direction is the downward orientation (arrow B)), and in Figure 5(b), the two straight lasers 5, 5 are processed, and in Figure 5(b), the bag opening (ignoring orientation) with excessive force applied to the downward direction (arrow B) is "4 mm" on the back surface 3 of the downward orientation (arrow B), and in the bag opening (ignoring orientation) with excessive force applied to the downward direction (arrow B), the surface 2 is "1 mm" on the downward orientation (arrow B) (cut direction is the downward orientation (arrow B)). In this case, a step 8 of 1 mm or more is created (see Figs. 5(a) and (b)). In Figs. 5(a) and (b), the above-mentioned notch 12 is provided.

[0043] In Fig. 6(a)(b), when excessive force is applied, the stretched film 1 may not follow the upward orientation (arrow C) and the upward orientation (arrow C). In Fig. 6(a), the two straight lasers 4,4 are processed, and in Fig. 6(a), the bag opening (ignoring orientation) where excessive force is applied to the upward orientation (arrow C) is "2 mm" on the surface 2 (cut direction is the upward orientation (arrow C)), and in Fig. 6(b), the two straight lasers 5,5 are processed, and in Fig. 6(b), the bag opening (ignoring orientation) where excessive force is applied to the upward direction (arrow C) is "4 mm" on the back surface 3 (cut direction is the upward orientation (arrow C). In this case, a step 9 of "1 mm" or more is formed (see Fig. 6(a)(b)). In Fig. 6(a)(b), the notch 12 is provided.

[0044] The above-mentioned surface 2, the above-mentioned back surface 3, the above-mentioned two-line straight laser 4,4, and the above-mentioned two-line straight laser 5,5 are different in distance and position. The shape is simple. By changing the above-mentioned distance, it is also possible to deal with the change in the processing position.

[0045] [Packaging bag] FIG. 7 is a view showing an example of an embodiment of the packaging bag of the present invention. FIG. 7 shows the package in a front view. When using the packaging bag, any item can be accommodated and used, but in this embodiment and the like, the description will be made in a state where nothing is accommodated.

[0046] The packaging bag in FIG. 7 has a front film and a back film. By overlapping the front film and the back film and bonding the upper part, both side parts, and the lower part on all four sides, the contents can be sealed. In these descriptions, when using the packaging bag, it is common to open the planned opening part in the lateral direction from the tear start part and take out the contents accommodated in the range closed by both side parts and the lower part in FIG. 7. For this reason, the side where the laser processing part is provided and where the opening is planned will be described as the upper part, and the opposite side will be described as the lower part.

[0047] FIG. 8 is a view showing another example of an embodiment of the packaging bag of the present invention. FIG. 8 is in accordance with the embodiment of FIG. 7, and is an embodiment in which there is one laser processing part on the front side and two laser processing parts on the back side. FIGS. 7(a) and 8(a) show the closed state before opening. FIGS. 7(b) and 8(b) show the state after opening from the tear start part in the right direction.

[0048] [Orientation direction] The front film has a first orientation direction. The back film has a second orientation direction different from the first orientation direction of the front film. In the packaging bags of FIGS. 7 and 8, as shown by the solid line, the front film has a downward diagonal orientation as it progresses to the right. As shown by the broken line, the back film has an upward diagonal orientation as it progresses to the right. The orientation direction can be grasped to a certain extent by the manufacturing process of the stretched film used, physical property analysis, tear test, and the like.

[0049] In this device, the orientation of the front film and the back film need only be different so that they face in opposite directions on either side of the tearing direction, and two or more laser-processed sections are provided on the back film, and by starting to tear between them, the opening will be done along whichever laser-processed section is in the appropriate orientation. Therefore, even if the film is manufactured without checking the orientation direction of the original roll, the opening will be done along either the upper or lower laser-processed section, allowing for stable opening. Also, when the tearing start sections are provided on both ends, opening will be done along the upper or lower laser-processed section in accordance with the orientation, regardless of which direction it is torn from.

[0050] [Tear start point] The packaging bag has a tear initiation portion between the back side laser processed portions of the side portions. The tear initiation portion is a portion processed to make it easier to start tearing by a cut, a cut mark, a fine hole or mark, laser processing, etc. The tear initiation portion may be provided on only one side portion or on both sides.

[0051] [Resealing section] The packaging bag can have a resealing section below the front laser processing section and the back laser processing section. The resealing section can be a resealing section such as a zipper tape provided on the front film and the back film, respectively. If an unintended separation occurs despite the resealing section being provided on the packaging bag, the bag will tear to reach the resealing section, which may cause the resealing section to be scratched and become difficult to function or to grip. Since the packaging bag of the present invention has a laser processing section, even if a tear occurs due to any orientation, the bag will be opened along the laser processing section, and the resealing section can be maintained in a normal state.

[0052] The front and back films are made of thermoplastic resin films having a stretched orientation. The film may be uniaxially stretched or biaxially stretched, and may be oriented during a conveying process. As the thermoplastic resin, films of polyethylene, polypropylene, polyester, nylon, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polycarbonate, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, etc. may be used. It is preferable to use a film containing stretched polypropylene, polyester, or nylon. The front and back films may be a specific thermoplastic resin film alone, or a laminated film that is a composite of multiple thermoplastic resins and other materials. The shape of the bag may be a flat bag, a gusset bag, a pillow packaging bag, a standing pouch, etc.

[0053] The packaging bag can be used to store any content, such as food, medicine, clothing, cosmetics, daily necessities, home appliances, precision machinery, electronic devices, and industrial products.

[0054] [Laser Processing Department] The front film has one or more linear front laser processed portions along the opening direction, and the back film has two or more linear back laser processed portions along the opening direction.

[0055] Fig. 9 is a diagram showing an example of the laser processing part of the packaging bag of the present invention. In Fig. 9, the combination of orientation directions of the front and back films are as shown by the solid double arrows or as shown by the dashed double arrows, depending on the state of the stretched film to be used, and the front and back films have orientations in opposite directions.

[0056] In Fig. 9(a), the front side laser processing part has two linear laser processing parts, the back side laser processing part has two linear laser processing parts, and the front side laser processing part and the back side laser processing part overlap. The positions of these laser processing parts are the positions when the packaging bag is viewed from the front and overlapped. When pulled horizontally from the tear start part, if the orientation of the solid line occurs, the front side spreads downward and the back side spreads upward, and after reaching each laser processing part, it is torn along the laser processing part and opened.

[0057] In Fig. 9(b) and Fig. 9(c), the laser processed part on the front side has two straight lines, and the laser processed part on the back side has two straight lines, and the positions of the laser processed parts on the front side and the back side do not overlap. In Fig. 9(b), the laser processed parts on the front side film are arranged at a narrow interval, and the back side film is arranged at a wide interval so as to sandwich the laser processed parts on the front side film. In Fig. 9(c), the intervals between the laser processed parts on the front side and the laser processed parts on the back side are arranged at approximately the same interval, but the positions are shifted so that they do not overlap. With such an arrangement, even if the film is torn with a strong force that does not follow the orientation of the film, it can be opened with a difference in the remaining part of the film on the front side and the back side.

[0058] In Fig. 9(d), the front side laser processed part has one linear laser processed part, the back side laser processed part has two linear laser processed parts, and a tear start part is provided at the end of the front side laser processed part. By using such processed parts, the front side is opened along the laser processed part immediately from the tear start part, and the back side is opened along the laser processed part after shifting up or down along the orientation and reaching the laser processed part.

[0059] [Example of manufacturing flow] Fig. 10 is a diagram showing an example of an embodiment of the manufacturing method of the packaging bag of the present invention. In order to manufacture the packaging body continuously, it is preferable to manufacture the packaging body by processing a roll of a strip-shaped stretched film while conveying it. At this time, a part of the strip-shaped film as viewed in the conveying direction is used as the front film, and the other part is used as the back film.

[0060] Fig. 10(a) shows a process for providing a laser processing section for the front side and a laser processing section for the back side while transporting a strip-shaped film that has been stretched and has an orientation direction. Here, processing is performed on both ends of the strip-shaped film to create the laser processing sections.

[0061] Fig. 10(b) shows the process of separating the strip-shaped bag film into a film for the front side and a film for the back side while conveying the film. Here, the strip-shaped film is separated by cutting near the center. Note that the front and back sides may also be separated by simply folding the film, for example.

[0062] Figure 10(c) shows the process of overlapping the front and back films in the corresponding positions while transporting them in a strip shape, with the front laser processing section as the front laser processing section and the back laser processing section as the back laser processing section. Here, the right half used for the front film is flipped over to align the orientation.

[0063] Fig. 10(d) shows the process of overlapping the front film and the back film, attaching the bottom and side portions, and cutting them out. Here, the front film and the back film are aligned, and the bottom and side portions are welded together. After that, the side portions are cut near the center of the welded portions to obtain a packaging bag as shown in Fig. 10(e).

[0064] These manufacturing flows are merely examples, and the direction, order, or steps can be changed or omitted within an appropriate range depending on the configuration of the packaging bag, the state of the film to be used as the raw roll, the layout of the manufacturing equipment, etc. For example, the order can be changed so that the laser processing section is provided after the film for the front side and the film for the back side are separated. EXAMPLES

[0065] (Experimental Example 1) A packaging bag was made using a laminated film of biaxially oriented nylon film (NY) as a base material and low-density polyethylene film (L-LDPE) as a sealant. The front and back films were manufactured by folding and overlapping rolled films, which are assumed to have an oblique orientation direction relative to the conveying direction, so the orientation directions of the front and back films are assumed to be in opposite directions, crossing each other. The front film had two linear laser-processed areas spaced 2 mm apart. The back film had two linear laser-processed areas spaced 4 mm apart, sandwiching the laser-processed area of ​​the front film. A notch was provided near the center of the side of the laser-processed area, which would be the edge of the laser-processed area, to serve as the tear initiation area. This laser-processed area tears along the orientation when torn, so if the front side is torn upwards, the back side is torn downwards, and if the front side is torn downwards, the back side is torn upwards, resulting in a difference of 3 mm after tearing, with the front side being 1 mm up and the back side being 2 mm down, or the front side being 1 mm down and the back side being 2 mm up.

[0066] Composition: NY 15μ / / L-LDPE70μ, Base material: NY (biaxially oriented film), Sealant: L-LDPE, Pitch: 100, Printing: Yes, Surface drawing, Laser pattern: 2mm intervals (front) / 4mm intervals (back) (step 3mm).

[0067] [Tear test results] Three samples were prepared and pulled by hand with a weak force from the tear initiation point. The tearing results were as follows. Laser suitability: ◎, Front: Guides 2mm below, Back: Guides 4mm above. Laser suitability: ◎, Front: Guides 2mm below, Back: Guides 4mm above. Laser suitability: ◎, Front: Guides 2mm below, Back: Guides 4mm above.

[0068] (Experimental Example 2) A test was conducted in accordance with Experimental Example 1, with the position of the laser processed portion changed as follows: The front film had two linear laser-processed areas spaced 3 mm apart. The back film had two linear laser-processed areas spaced 3 mm apart, 1 mm below the laser-processed areas on the front film. A notch was provided near the center of the laser-processed areas on the side that would become the edge of the laser-processed areas, which would serve as the tear initiation area. In this laser-processed area, if the front side is torn upwards, the back side is torn downwards, and if the front side is torn downwards, the back side is torn upwards, so that the range is 1mm up on the front side and 3mm down on the back side, or 1mm down on the front side and 3mm up on the back side, resulting in a difference of approximately 4mm after tearing.

[0069] Composition: NY 15μ / / L-LDPE70μ, Base material: NY (biaxially oriented film), Sealant: L-LDPE, Pitch: 100, Printing: Yes, Surface drawing, Laser pattern: 3mm (front) / 3mm (back) front and back, Shift position by 1mm (step 4mm),

[0070] Three samples were prepared and pulled by hand with a weak force from the tear initiation point. The tearing results were as follows. Laser suitability: ○, front: guides downward, back: guides downward. Laser suitability: ○, front: guides downward, back: guides downward. Laser suitability: ◎, front: guides downward, back: guides upward. [Industrial Applicability]

[0071] The cutting direction of the packaging bag is guided with respect to the two linear lasers (4,4) and (5,5). [Explanation of symbols]

[0072] 1. Stretched film 2 surface 3 Back side 4,4 2 linear lasers 5,5 2 linear lasers 6 steps 7 steps 8 steps 9 Steps 10 steps 11 Steps A direction B direction C direction D direction E direction F direction < / a1>

Claims

1. a front film having a first orientation direction; A packaging bag having a back film having a second orientation direction different from the first orientation direction, The front film has one or more linear front laser processed portions along the opening direction, The back film has two or more linear back laser processed portions along the opening direction, A tear initiation portion is provided between the rear laser processed portions of the side portions, The packaging bag is torn from the tear initiation portion along the orientation direction of the film, and the tear reaches the front-side laser-processed portion and the back-side laser-processed portion during the tear, and is torn along the front-side laser-processed portion and the back-side laser-processed portion.

2. The packaging bag according to claim 1 , further comprising a resealable portion below the front-side laser-processed portion and the back-side laser-processed portion.

3. The front side laser processed portion has two linear laser processed portions, and the back side laser processed portion has two linear laser processed portions, 3. The packaging bag according to claim 1 or 2, wherein the front side laser-processed portion and the rear side laser-processed portion do not overlap in position, or the front side laser-processed portion and the rear side laser-processed portion overlap in position.

4. The front side laser processed portion has one linear laser processed portion, and the back side laser processed portion has two linear laser processed portions, The packaging bag according to claim 2 , wherein the tear initiation portion is provided at an end portion of the laser-processed portion on the front side.

5. The front film and the back film each have a layer of a stretched film selected from the group consisting of stretched polypropylene, stretched polyester, and stretched nylon; The front side laser processed portion and the back side laser processed portion are provided directly on each layer of the stretched film, The packaging bag according to claim 2 , wherein the front film and the back film are overlapped and pasted together on all four sides to form a sealed bag.

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