JP2020055573A - Package and package manufacturing method - Google Patents

Abstract

To provide a package and a package manufacturing method capable of suppressing opening of the package from an unintended place and easily opening the package.SOLUTION: A package 10 comprises: a first film 20 that has upper and lower parts 21, 22 to be foldable; and a second film 30 that overlaps the lower part 22. The upper part 21 overlaps the second film 30. First and second weak seals 51, 52 for joining together the upper part 21 and the second film 30 are provided between the upper part 21 and the second film 30. A strong seal 40 for joining together the lower part 22 and the second film 30 is provided between the lower part 22 and the second film 30.SELECTED DRAWING: Figure 3A

Description

  The present disclosure relates to a package and a method for manufacturing the package.

  2. Description of the Related Art Conventionally, various types of packages manufactured by bonding plastic soft packaging materials (films) to each other have been known. Such packages include those that break the film that forms the package and open the package, and those that open the package by peeling the film that forms the package from the joint between the films. is there. As a package for opening a package by peeling off a film constituting the package, a package containing stationery and the like, and an individual package for containing food items such as sliced cheese are known. (For example, Patent Document 1).

JP 2014-181076 A

  By the way, when films are bonded to each other as in the case of an individual body disclosed in Patent Document 1, the seal strength when the films are bonded to each other is determined by a selected material and a sealing temperature, particularly a material constituting a sealant layer. You. That is, if a material for a so-called easy peel is used as a material for forming the sealant layer, the seal strength becomes small enough to be peeled off by hand. On the other hand, if a normal polyethylene (for example, linear low-density polyethylene (LLDPE)) or an unstretched polypropylene (CPP) film is used, the sealing strength is large enough to be not peeled off by hand.

  However, when the sealing strength is set to a small sealing strength, depending on the contents to be accommodated in the package or the form of the package, a force acting on the package during transportation of the package may cause the package to be placed in an unintended location. Could be opened from In addition, when the sealing strength is set to a large sealing strength, there is a problem that the joint portion between the films cannot be peeled by hand when the package is opened.

  The present disclosure has been made in view of such a point, and can prevent a package from being opened from an unintended location, and can easily open the package. And a method for producing a package.

  A package according to one embodiment includes a first film having a foldable upper portion and a lower portion, and a second film overlapping the lower portion of the first film, wherein the upper portion of the first film has The portion overlaps the second film, and a first weak seal portion that joins the upper portion and the second film to each other is provided between the upper portion of the first film and the second film. Or a first weak seal portion for joining the upper portion and the lower portion to each other is provided between the upper portion and the lower portion of the first film, and the lower portion of the first film is provided. Packaging, between the first film and the second film, provided with a strong seal portion extending along both side edges of the second film and joining the lower portion of the first film and the second film to each other. In the body .

  In the package according to one embodiment, the sealing strength of the strong sealing portion may be 23 N / 15 mm or more and 150 N / 15 mm or less.

  In the package according to one embodiment, the first weak seal portion may have a seal strength of 1 N / 15 mm or more and 10 N / 15 mm or less.

  In the package according to one embodiment, between the upper portion of the first film and the second film, extends along both side edges of the second film, and connects the upper portion and the second film to each other. A second weak seal portion to be joined may be provided.

  In one embodiment, the second weak seal portion may have a seal strength of 1 N / 15 mm or more and 10 N / 15 mm or less.

  In the package according to one embodiment, a first portion extending along both side edges of the lower portion between the upper portion and the lower portion of the first film, and joining the upper portion and the lower portion to each other. Three weak seals may be provided.

  In the package according to one embodiment, the third weak seal portion may have a seal strength of 1 N / 15 mm or more and 10 N / 15 mm or less.

  A method of manufacturing a package according to one embodiment includes a step of preparing a first film having a foldable upper part and a lower part, and a step of preparing a second film overlapping the lower part of the first film. And bonding the upper portion of the first film and the second film to each other and forming a first weak seal portion between the upper portion of the first film and the second film, or Joining the upper portion and the lower portion of the first film to each other to form a first weak seal portion between the upper portion and the lower portion; and forming the first weak seal portion between the lower portion and the first portion of the first film. Bonding two films to each other and forming a strong seal portion extending along both side edges of the second film between the lower portion of the first film and the second film. Manufacturing method .

  In the method for manufacturing a package according to one embodiment, a sealing strength of the strong sealing portion may be 23 N / 15 mm or more and 150 N / 15 mm or less.

  In the method for manufacturing a package according to one embodiment, the first weak seal portion may have a seal strength of 1 N / 15 mm or more and 10 N / 15 mm or less.

  In the method for manufacturing a package according to one embodiment, the upper portion of the first film and the second film are joined to each other, and the upper portion of the second film is interposed between the upper portion and the second film. The method may further include forming a second weak seal portion extending along both side edges.

  In the method for manufacturing a package according to one embodiment, a seal strength of the second weak seal portion may be 1 N / 15 mm or more and 10 N / 15 mm or less.

  In the method for manufacturing a package according to one embodiment, the upper part and the lower part of the first film are joined to each other, and between the upper part and the lower part, along both side edges of the lower part. The method may further include a step of forming a third weak seal portion that extends.

  In the method for manufacturing a package according to one embodiment, the third weak seal portion may have a seal strength of 1 N / 15 mm or more and 10 N / 15 mm or less.

  In the method for manufacturing a package according to one embodiment, a sealing temperature when forming the third weak seal portion may be lower than a seal temperature when forming the strong seal portion.

  According to the present disclosure, it is possible to prevent the package from being opened from an unintended location, and to easily open the package.

FIG. 1 is a perspective view showing a package according to an embodiment. FIG. 2 is an exploded perspective view showing the package according to the embodiment. FIG. 3A is a front view illustrating the package according to the embodiment, and is a diagram illustrating a state where the package is not opened. FIG. 3B is a front view illustrating the package according to the embodiment, and is a diagram illustrating a state where the package is opened. FIG. 4 is a cross-sectional view (a cross-sectional view taken along line IV-IV in FIG. 3A) illustrating the package according to the embodiment. FIG. 5A is a diagram illustrating an example of a method of measuring the seal strength. FIG. 5B is a diagram illustrating an example of a method of measuring the seal strength. FIG. 5C is a graph showing a change in tensile stress with respect to a distance between a pair of grips. FIG. 6A is a cross-sectional view illustrating a first laminate that constitutes a first film of the package according to the embodiment. FIG. 6B is a cross-sectional view illustrating a second laminate that constitutes the second film of the package according to the embodiment. FIG. 7 shows a case where the first sealant layers of the first film are bonded to each other, and a case where the first sealant layer of the first film and the third sealant layer of the second film are bonded to each other. 6 is a graph showing the relationship of. 8A to 8C are perspective views illustrating a method for manufacturing a package according to one embodiment. 9A to 9C are perspective views illustrating a method for manufacturing a package according to one embodiment. FIG. 10 is a front view showing a modification (first modification) of the package according to the embodiment. FIGS. 11A to 11C are perspective views showing a modification of the manufacturing method of the modification (first modification) of the package according to the embodiment. FIGS. 12A and 12B are perspective views showing a modification of the manufacturing method of the modification (first modification) of the package according to the embodiment. FIG. 13 is a front view showing a modification (second modification) of the package according to the embodiment.

  Hereinafter, an embodiment will be described with reference to the drawings. 1 to 8 are views showing an embodiment. Each figure shown below is schematically shown. Therefore, the size and shape of each part are exaggerated as appropriate to facilitate understanding. Further, the present invention can be appropriately changed and implemented without departing from the technical idea. In the following drawings, the same portions are denoted by the same reference numerals, and a detailed description thereof may be partially omitted. Further, the numerical values such as the dimensions of each member and the material names described in this specification are merely examples of the embodiment, and are not limited thereto, and can be appropriately selected and used. In this specification, terms specifying shapes and geometric conditions, such as terms such as parallel, orthogonal, and vertical, include not only strictly meaning but also substantially the same state.

Configuration of the package First, referring to FIG. 1 to FIG. 4, the outline of the package according to the present embodiment.

  As shown in FIG. 1, the package 10 includes a first edge 11, a second edge 12 opposed to the first edge 11 in the first direction D <b> 1, and a first direction D <b> 1 from the first edge 11 to the second edge 12. And a pair of side edges 13 extending along. In the example shown in FIG. 1, the first edge 11 and the second edge 12 extend along a second direction D2 orthogonal to the first direction D1, so that the package 10 has a rectangular outer shape. I have.

  As shown in FIGS. 1 and 2, the package 10 includes a first film 20 having a foldable upper portion 21 and a lower portion 22, and a second film overlapping the lower portion 22 of the first film 20. 30. The upper portion 21 of the first film 20 overlaps the second film 30. That is, the first film 20 is folded along the fold line 23 so that the upper portion 21 covers a part of the second film 30 including the first edge 31 of the second film 30. Therefore, the edge 24 of the upper portion 21 of the first film 20 is located on the second film 30. In the present embodiment, the edge 24 of the upper portion 21 of the first film 20 extends along the second direction D2.

  In this case, as shown in FIG. 1, the first edge 11 of the package 10 is defined by the fold line 23 of the first film 20. On the other hand, the second edge 12 of the package 10 is formed by an edge 25 of the lower portion 22 of the first film 20 and a second edge 32 that faces the above-described first edge 31 of the second film 30 in the first direction. It is defined. Further, a part of the pair of side edges 13 on the first edge 11 side includes side edges 26 of the upper portion 21 of the first film 20, side edges 27 of the lower portion 22, and both side edges 33 of the second film 30. And is defined by The other portion of the pair of side edges 13 on the second edge 12 side is defined by both side edges 27 of the lower portion 22 of the first film 20 and both side edges 33 of the second film 30. As shown in FIG. 1, the package 10 is configured such that the upper portion 21 of the first film 20 is peeled off from the second film 30, thereby exposing the first edge 31 of the second film 30. It is configured so that the contents can be taken out. That is, an opening is formed between the first edge 31 of the second film 30 and the lower portion 22 of the first film 20. The contents filled in the package 10 are configured to be taken out from the opening. In the present embodiment, the first edge 31 of the second film 30 extends along the second direction.

  The first edge 31 of the second film 30 is located closer to the second edge 12 of the package 10 than the fold line 23 of the first film 20. In other words, the length of the second film 30 along the first direction D1 is shorter than the lower portion 22 of the first film 20. Therefore, a region where the upper portion 21 of the first film 20 overlaps the lower portion 22 is formed between the first edge 11 of the package 10 and the first edge 31 of the second film 30. Thereby, as described later, the upper portion 21 of the first film 20 is peeled off from the second film 30 and the lower portion 22, and when the package 10 is opened, the first edge 31 of the second film 30 is securely held. The contents can be exposed, and the contents can be easily taken out from the package 10.

  In such a package 10, the upper portion 21 of the first film 20 and the second film 30 constitute the surface of the package 10. On the other hand, the lower part 22 of the first film 20 forms the back surface of the package 10. In this case, the package 10 is configured by joining the first film 20 and the second film 30 to each other by heat welding or the like.

  Next, the package 10 according to the present embodiment will be described in more detail with reference to FIGS. 3A to 4.

  As shown in FIGS. 3A to 4, between the lower portion 22 of the first film 20 and the second film 30, the lower portion 22 of the first film 20 extends along both side edges 33 of the second film, A strong seal portion 40 that joins the second film 30 to each other is provided. The strong seal portion 40 is a portion that is not intended to be opened, and has a higher seal strength than a first weak seal portion 51, a second weak seal portion 52, and a third weak seal portion 53 described later. Thereby, it is possible to suppress a problem that the package 10 is opened from an unintended location due to a force acting on the package 10 when the package 10 is transported or the like.

  The strong seal portion 40 is provided in the entire region where the lower portion 22 of the first film 20 and the second film 30 overlap when viewed from the second direction D2. Thereby, it is constituted so that the sealing performance of the package 10 can be improved.

  The sealing strength of the strong sealing portion 40 is preferably such that the user cannot open the package 10 by hand, and is preferably 23 N / 15 mm or more and 150 N / 15 mm or less. When the sealing strength of the strong seal portion 40 is 23 N / 15 mm or more, it is possible to effectively suppress a problem that the package 10 is opened from the strong seal portion 40 during transportation of the package 10 or the like. In addition, since the sealing strength of the strong seal portion 40 is 23 N / 15 mm or more, it is difficult for the user of the package 10 to open the package 10 from the strong seal portion 40 when opening the package 10. become. Thereby, when the user opens the package 10, it is possible to suppress a problem that the package 10 is opened from the unintended strong seal portion 40 and the contents are difficult to be taken out. In addition, it is possible to suppress a problem that the contents are crushed when the contents are taken out from the portion where the strong seal portion 40 is provided. Further, when the sealing strength of the strong sealing portion 40 is 150 N / 15 mm or less, it is possible to prevent the first film 20 and the second film 30 from being too thick. That is, when increasing the sealing strength, it is common to change the material constituting the sealant layer of the film to be joined, or to increase the thickness of the film to be joined. On the other hand, when the sealing strength of the strong sealing portion 40 is 150 N / 15 mm or less, it is possible to suppress the thickness of the first film 20 and the second film 30 from becoming too thick. Thereby, the cost of manufacturing the package 10 can be reduced.

  Here, the seal strength can be measured as follows. Here, an example in which the seal strength of the strong seal portion 40 is measured will be described. However, the first weak seal portion 51, the second weak seal portion 52, and the third weak seal portion 53 described later are similarly measured. be able to.

  First, a portion where the films are joined (in this case, a portion where the lower portion 22 of the first film 20 and the second film 30 are joined) is cut out, and as shown in FIG. 5A, the films 80a and 80b ( A rectangular test piece 80 is prepared by peeling the first film 20 and the second film 30) by 15 mm in the long side direction. The width (length of the short side) of the test piece 80 is 15 mm. Thereafter, as shown in FIG. 5B, the portions of the pair of films 80a and 80b that have already been peeled are gripped by grippers 81 and 82 of the measuring device, respectively. As the measuring instrument, for example, Tensilon Universal Material Testing Machine RTC-1310 manufactured by A & D can be used. At this time, the environment at the time of measurement is, for example, a temperature of 23 ° C. and a relative humidity of 50%. Next, the grippers 81, 82 are pulled at a speed of 300 mm / min in directions opposite to each other in a direction orthogonal to the surface direction of the portion where the films 80a, 80b are still joined together, at a speed of 300 mm / min. Measure the average value of the stress. The interval S between the grippers 81 and 82 when starting the pulling is 30 mm, and the interval S between the grippers 81 and 82 when the pulling is finished is 60 mm. FIG. 5C is a diagram showing a change in tensile stress with respect to the interval S between the grippers 81 and 82. As shown in FIG. 5C, the change in the tensile stress with respect to the interval S enters the second region (stable region) having a smaller change rate than the first region via the first region. Then, the tensile stress in the stable region is measured, and the value is defined as the seal strength between the films 80a and 80b. In this way, the seal strength is measured.

  As shown in FIGS. 3A to 4, a first weak seal portion 51 that joins the upper portion 21 and the second film 30 to each other is provided between the upper portion 21 and the second film 30 of the first film 20. Is provided. The first weak seal portion 51 is a portion intended to peel off the first film 20 from the second film 30 when the user opens the package 10, and has a stronger sealing strength than the strong seal portion 40. Is a small part. Thereby, when the user opens the package 10, the package 10 can be easily opened from the first weak seal portion 51.

  The first weak seal portion 51 has a V-shape. In this case, the first weak seal portion 51 extends from one side edge of the pair of side edges 13 to the other side edge such that the V-shaped tip portion faces the second edge 12 side. I have. Thereby, it is constituted so that the sealing performance of the package 10 can be improved. Note that the first weak seal portion 51 only needs to be provided so as to overlap at least a second weak seal portion 52 described later when viewed along the first direction D1. Thereby, the sealing performance of the package 10 can be maintained. Further, the first weak seal portion 51 is not limited to the V-shape, and may have an arbitrary shape such as a rectangular shape.

  The upper portion 21 of the first film 20 and the second film 30 extend along the side edges 33 of the second film 30 between the upper portion 21 of the first film 20 and the second film 30. A second weak seal portion 52 is provided. The second weak seal portion 52 is a portion intended to peel off the upper portion 21 of the first film 20 from the second film 30 when the user opens the package 10, and the strong seal portion 40 This is a portion where the sealing strength is lower than that of the portion. Thereby, when the user opens the package 10, the package 10 can be easily opened from the second weak seal portion 52.

  The second weak seal portion 52 is provided in the entire region where the upper portion 21 of the first film 20 and the second film 30 overlap when viewed from the second direction D2. Thereby, it is constituted so that the sealing performance of the package 10 can be improved.

  Further, between the upper part 21 and the lower part 22 of the first film 20, a third weak seal part 53 extending along both side edges 27 of the lower part 22 and joining the upper part 21 and the lower part 22 to each other is provided. Is provided. The third weak seal portion 53 is a portion intended to peel off the upper portion 21 of the first film 20 from the lower portion 22 when the user opens the package 10. This is also a part where the seal strength is small. Thus, when the user opens the package 10, the package 10 can be easily opened from the third weak seal portion 53.

  The third weak seal portion 53 is located closer to the first edge 11 of the package 10 than the first edge 31 of the second film 30. This allows the first edge 31 of the second film 30 to be reliably exposed when the package 10 is opened, as shown in FIG. 3B. For this reason, the contents can be easily taken out from the package 10. The third weak seal portion 53 is provided in the entire region where the upper portion 21 and the lower portion 22 of the first film 20 overlap when viewed from the second direction D2. Thereby, it is constituted so that the sealing performance of the package 10 can be improved.

  It is preferable that the first weak seal portion 51, the second weak seal portion 52, and the third weak seal portion 53 have such a strength that the user can open the package 10 by hand. It is preferable that each is 1 N / 15 mm or more and 10 N / 15 mm or less. Since the sealing strength of each of the first weak seal portion 51, the second weak seal portion 52, and the third weak seal portion 53 is 1 N / 15 mm or more, the user can manually hold the hermeticity of the package 10 while maintaining hermeticity. The package 10 can be opened. In addition, since the sealing strength of each of the first weak seal portion 51, the second weak seal portion 52, and the third weak seal portion 53 is 15 N / 15 mm or less, the user can open the package 10 by hand. Failures that cannot be performed can be suppressed.

  As shown in FIGS. 1, 3A, and 3B, an opening is formed on the second edge 12 of the package 10. After the contents are filled in the package 10, the opening of the second edge 12 is sealed to form the second edge sealing portion 41 (virtual line). The sealing strength of the second edge sealing portion 41 is preferably substantially the same as the sealing strength of the strong sealing portion 40 described above, and is preferably 23 N / 15 mm or more and 150 N / 15 mm or less.

  The contents accommodated in such a package 10 are, for example, solids. The contents may be solids that a person eats, such as food, or solids that a person does not eat, such as stationery. Specific examples of the contents 19 include confectionery, dried food, cheese, and the like.

Configuration of First Film and Second Film Next, the first film 20 and the second film 30 of the package 10 according to the present embodiment will be described with reference to FIGS. 6A and 6B. The first film 20 of the package 10 according to the present embodiment is configured by a first laminate 60, and the second film 30 is configured by a second laminate 70.

  As shown in FIG. 6A, the first laminate 60 forming the first film 20 has a first base material 61 and a first sealant layer 62 formed on the first base material 61. . That is, the first stacked body 60 has the first base material 61 located on the outer surface 601 side and the first sealant layer 62 located on the inner surface 602 side. In the example shown in FIG. 6A, the first base material 61 configures the outer surface 601 of the first laminate 60, and the first sealant layer 62 configures the inner surface 602 of the first laminate 60. Note that the outer surface 601 is a surface facing the opposite side of the contents in the package 10, and the inner surface 602 is a surface facing the contents side. Further, a first anchor coat layer 63 is provided between the first base material 61 and the first sealant layer 62. The first base material 61, the first anchor coat layer 63, and the first sealant layer 62 are stacked on each other along the third direction D3. The third direction D3 is a direction orthogonal to the first direction D1 and the second direction D2 (see FIGS. 1 and 2).

  As shown in FIG. 6B, the second laminate 70 constituting the second film 30 includes a second base 71, a second sealant layer 72 formed on one side of the second base 71, The second base material 71 has a third sealant layer 73 formed on the other side. That is, the second laminate 70 includes a second sealant layer 72 located on the outer surface 701 side, a third sealant layer 73 located on the inner surface 702 side, and a second sealant layer 72 between the second sealant layer 72 and the third sealant layer 73. And a second base material 71 located thereon. In the example shown in FIG. 6B, the second sealant layer 72 configures the outer surface 701 of the second laminate 70, and the third sealant layer 73 configures the inner surface 702 of the second laminate 70. Note that the outer surface 701 is a surface facing the opposite side of the contents in the package 10, and the inner surface 702 is a surface facing the contents side. For this reason, the second sealant layer 72 of the second laminate 70 is joined to a portion of the first sealant layer 62 of the first laminate 60 corresponding to the upper portion 21 of the first film 20, and the second laminate 70 The third sealant layer 73 of 70 is joined to a portion of the first sealant layer 62 of the first laminate 60 corresponding to the lower portion 22 of the first film 20. An adhesive layer 74 that bonds the second base material 71 and the second sealant layer 72 is provided between the second base material 71 and the second sealant layer 72. Further, a second anchor coat layer 75 is provided between the second base material 71 and the third sealant layer 73. The second sealant layer 72, the adhesive layer 74, the second base material 71, the second anchor coat layer 75, and the third sealant layer 73 are stacked on each other along the third direction D3.

  By the way, as described above, the second laminate 70 constituting the second film 30 includes the second base material 71, the second sealant layer 72 formed on one side of the second base material 71, And a third sealant layer 73 formed on the other side of the second base material 71. Thus, when the first film 20 and the second film 30 are joined to each other, the first sealant layer 62 and the second sealant layer 72 are joined to each other by folding the first film 20 as described above. And a portion where the first sealant layer 62 and the third sealant layer 73 are joined to each other. For this reason, when the first film 20 and the second film 30 are joined to each other, for example, by adjusting the sealing temperature, the sealing strength of the seal portion where the first sealant layer 62 and the second sealant layer 72 are joined to each other is improved. Each seal portion can be formed such that the seal strength of the seal portion in which the first sealant layer 62 and the third sealant layer 73 are joined to each other is different. As a result, it is possible to prevent the package 10 from being opened from an unintended place, and to easily obtain the package 10 that allows the package 10 to be easily opened.

  In the present embodiment, the seal strength between the first sealant layer 62 and the second sealant layer 72 is smaller than the seal strength between the first sealant layer 62 and the third sealant layer 73. . In this case, as described above, the seal strength of each seal portion may be adjusted by adjusting the seal temperature. Alternatively, as described later, the seal strength of each seal portion may be adjusted by forming the second sealant layer 72 and the third sealant layer 73 from different materials. Thereby, the first weak seal portion 51 and the second weak seal portion 52 of the above-described package 10 are formed between the first sealant layer 62 and the second sealant layer 72, and the first sealant layer 62 and the third The strong seal portion 40 of the package 10 described above can be formed between the sealant layer 73 and the sealant layer 73. Therefore, it is possible to prevent the package 10 from being opened from an unintended place, and to easily open the package 10.

  When the first sealant layers 62 are joined to each other, the seal strength between the first sealant layers 62 is smaller than the seal strength between the first sealant layer 62 and the third sealant layer 73. Thereby, the third weak seal portion 53 of the package 10 described above can be formed between the first sealant layers 62.

  Hereinafter, each layer constituting the laminate will be described.

[First base material]
The first base material 61 is not particularly limited as long as it is a plastic film, but from the viewpoint of cost and workability, polyethylene, polypropylene, polyamide, polyester, polycarbonate, polylactic acid, polyvinyl chloride, ethylene-vinyl alcohol. Copolymers and the like are preferred.

  When the first base material 61 is a layer (base material layer) constituting the outer surface of the package 10, the first base material 61 may be a synthetic resin having excellent mechanical, physical, and chemical properties. Can be used. For example, as the first base material 61, a polyester resin such as polyethylene terephthalate (PET), a polyamide resin such as nylon (Ny), a polypropylene resin, a polycarbonate resin, or a polyacetal resin can be used. Further, the first base material 61 is preferably a stretched film stretched in a uniaxial or biaxial direction.

  Moreover, the first base material 61 may include polyethylene terephthalate (PET) derived from biomass. The biomass-derived PET is a PET having biomass-derived ethylene glycol as a diol unit and fossil fuel-derived terephthalic acid as a dicarboxylic acid unit. The first base material 61 may further include PET derived from fossil fuel, in which ethylene glycol derived from fossil fuel is used as a diol unit, and terephthalic acid derived from fossil fuel is used as a dicarboxylic acid unit. Since the first base material 61 contains biomass-derived PET, the amount of fossil fuel-derived PET can be reduced and the environmental load can be reduced as compared with the conventional case.

  The thickness of the first base material 61 can be 8 μm or more and 50 μm or less, and preferably 9 μm or more and 25 μm or less.

[Second substrate]
Since the second base 71 can be made of substantially the same material as the first base 61 described above, detailed description is omitted here. The thickness of the second base 71 can be 8 μm or more and 50 μm or less, and preferably 9 μm or more and 25 μm or less. Note that the second base 71 may be the same material as the first base 61 or a different material from the first base 61.

[First sealant layer]
The first sealant layer 62 may be any material that can be sealed and sealed by heat fusion when the first film 20 and the second film are stacked to form the package 10. For example, as the first sealant layer 62, a low density polyethylene (LDPE), a medium density polyethylene (MDPE), a high density polyethylene (HDPE), a linear (linear) low density polyethylene (LLDPE), and a metallocene catalyst are used. Polymerized ethylene-α-olefin copolymer, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic Resins consisting of one or more resins such as acid copolymers can be used. As an example, the first sealant layer 62 may use an ionomer resin in which the molecules of the ethylene / methacrylic acid copolymer are crosslinked with metal ions.

  In addition, the first sealant layer 62 may include linear low-density polyethylene (LLDPE) derived from biomass and low-density polyethylene (LDPE), and further includes linear low-density polyethylene derived from fossil fuel. May be. Further, the low-density polyethylene may be derived from biomass or fossil fuel.

  The thickness of the first sealant layer 62 can be 20 μm or more and 150 μm or less, and preferably 30 μm or more and 100 μm or less.

[Second sealant layer]
The second sealant layer 72 can be made of substantially the same material as that of the first sealant layer 62 described above, and thus a detailed description is omitted here. The thickness of the second sealant layer 72 can be 20 μm or more and 150 μm or less, and preferably 30 μm or more and 120 μm or less. The second sealant layer 72 may be made of the same material as that of the first sealant layer 62, or may be made of a material different from that of the first sealant layer 62.

[Third sealant layer]
The third sealant layer 73 can be made of substantially the same material as the first sealant layer 62 described above, and thus a detailed description is omitted here. The thickness of the third sealant layer 73 can be 20 μm or more and 150 μm or less, and is preferably 30 μm or more and 120 μm or less. The third sealant layer 73 may be made of the same material as the first sealant layer 62 or the second sealant layer 72, or may be made of a material different from the first sealant layer 62 or the second sealant layer 72.

[First anchor coat layer]
The first anchor coat layer 63 is formed by applying and drying an anchor coat agent. Examples of the anchor coating agent include any resin having a heat-resistant temperature of 135 ° C. or higher, such as a vinyl-modified resin, an epoxy resin, a urethane resin, a polyester resin, and a polyethylene imine. An anchor coating agent which is a cured product of a polyacrylic or polymethacrylic resin (polyol) having two or more hydroxyl groups and an isocyanate compound as a curing agent can be preferably used. Further, a silane coupling agent may be used as an additive thereto, and nitrified cotton may be used in combination to increase heat resistance.

[Second anchor coat layer]
The second anchor coat layer 75 can be made of substantially the same material as the first anchor coat layer 63 described above, and thus a detailed description is omitted here.

[Adhesive layer]
The adhesive layer is formed by applying and drying an adhesive on the surface of the layer on the side to be laminated when two layers are bonded by a dry lamination method. Examples of the adhesive to be applied include one-pack or two-pack hardened or non-hardened vinyl, (meth) acrylic, polyamide, polyester, polyether, polyurethane, epoxy, and rubber. An adhesive such as a solvent type, an aqueous type, or an emulsion type can be used. As the two-part curable adhesive, a cured product of a polyol and an isocyanate compound can be used. As a coating method of the above-mentioned laminating adhesive, for example, a direct gravure roll coating method, a kiss coating method, a reverse roll coating method, a Fonten method, a transfer roll coating method, or another method can be used.

[Other layers]
In addition, the first laminate 60 and the second laminate 70 may include a print layer (picture layer) and a barrier layer as other layers. The printing layer may be provided on the surface on the inner surface 602 side of the first base material 61, or may be provided on the surface on the inner surface 702 side or the outer surface 701 side of the second base material 71. This printing layer can be provided by, for example, gravure printing or the like. The barrier layer is provided to extend the storage period of the contents, and is a metal layer such as an aluminum foil or a vapor-deposited layer of a metal oxide such as aluminum, a metal oxide such as aluminum oxide, or an inorganic oxide such as silicon oxide. For example, a resin layer having a gas barrier property, such as an ethylene-vinyl alcohol copolymer (EVOH), a polyvinylidene chloride resin (PVDC), or an aromatic polyamide such as nylon MXD6 can be used. In addition, a general formula R ¹ _nM (OR ² ) _m (where R ¹ and R ² represent an organic group having 1 to 8 carbon atoms, and M represents a metal atom, on the vapor deposition layer. , N represents an integer of 0 or more, m represents an integer of 1 or more, and n + m represents the valence of M.) and at least one alkoxide represented by the above-mentioned polyvinyl alcohol- A transparent gas barrier composition containing a sol-gel resin and / or an ethylene-vinyl alcohol copolymer, and polycondensed by a sol-gel method in the presence of a sol-gel method catalyst, an acid, water, and an organic solvent. An obtained gas barrier coating film may be provided.

  By the way, in the present embodiment, the above-described second sealant layer 72 and third sealant layer 73 of the second laminate 70 constituting the second film 30 include different materials. Thereby, the seal strength of the seal portion (the first weak seal portion 51 and the second weak seal portion 52) in which the first sealant layer 62 and the second sealant layer 72 are joined to each other, and the first sealant layer 62 and the third sealant Each seal portion can be easily formed so that the seal strength of the seal portion (strong seal portion 40) in which the layer 73 and the layer 73 are joined to each other is different. Therefore, it is possible to prevent the package 10 from being opened from an unintended place, and to easily obtain the package 10 that can easily be opened.

  In this case, as a material of the second sealant layer 72, a resin material capable of exhibiting so-called easy-peeling property can be used. On the other hand, as the material of the third sealant layer 73, an “ionomer resin obtained by crosslinking the molecules of an ethylene / methacrylic acid copolymer with metal ions” may be used. Further, as the material of the first sealant layer 62, “an ionomer resin in which the molecules of the ethylene / methacrylic acid copolymer are crosslinked with metal ions” may be used.

  Here, when an “ionomer resin obtained by crosslinking the molecules of an ethylene / methacrylic acid copolymer with metal ions” is used as a material of the first sealant layer 62 and the third sealant layer 73, the first sealant layers 62 are separated from each other. The seal strength when joined together and the seal strength when joined first sealant layer 62 and third sealant layer 73 increase in a multi-step manner. That is, as shown in FIG. 7, the seal strength when the first sealant layer 62 is joined to each other, the seal strength when the first sealant layer 62 and the third sealant layer 73 are joined to each other, the seal temperature, and the like. Is divided into a first stage S1, a second stage S2, and a third stage S3 in order from the side having the lower sealing temperature to the side having the higher sealing temperature. In this case, the slope of the seal strength in the second step S2 is larger than the slope of the seal strength in the first step S1 and the third step S3. The “slope of the seal strength” means an increase in the seal strength when the seal temperature increases by 1 ° C.

  In this case, the temperature range of the first step S1 is, for example, about 120 ° C. to 160 ° C., and the temperature range of the second step S2 is, for example, about 160 ° C. to 170 ° C. Further, the temperature range of the third step S3 is about 170 ° C. or more. The seal strength formed in the temperature range of the first stage S1 is about 5 N / 15 mm or more and 8 N / 15 mm or less, and the seal strength formed in the temperature range of the second step S2 is 8 N / 15 mm or more and 27 N / It is about 15 mm or less. Further, the seal strength formed in the temperature range of the third step S3 is about 27 N / 15 mm or more and about 35 N / 15 mm or less.

  Next, the sealing strength of the package 10 according to the present embodiment will be described in more detail. Here, as the material of the first sealant layer 62 and the third sealant layer 73, an “ionomer resin obtained by crosslinking the molecules of an ethylene / methacrylic acid copolymer with metal ions” is used, and as the material of the second sealant layer 72, A case where a resin material capable of exhibiting easy peel properties is used will be described. Here, as shown in Table 1, in the package 10 according to the present embodiment, the seal portion formed between the first sealant layer 62 and the second sealant layer 72 is the first weak seal portion 51 and the first sealant layer 51. 2 weak seal portion 52. The seal formed between the first sealant layer 62 and the third sealant layer 73 is the strong seal 40, and the seal formed between the first sealant layers 62 is the third weak seal. 53.

  First, the seal strength when the first sealant layer 62 and the second sealant layer 72 are joined to each other and the seal strength when the first sealant layer 62 and the third sealant layer 73 are joined to each other will be described.

  In the present embodiment, the first sealant layer 62 and the second sealant layer 72 are joined to each other by heating at a predetermined temperature, and the first sealant layer 62 and the third sealant layer 73 are joined to each other. In this case, the seal strength between the first sealant layer 62 and the second sealant layer 72 and the seal strength between the first sealant layer 62 and the third sealant layer 73 are different from each other.

  In this case, as described above, the second sealant layer 72 is made of a resin material capable of exhibiting a so-called easy-peel property. Therefore, for example, even when the first sealant layer 62 and the second sealant layer 72 are joined to each other by heating at a high temperature of 170 ° C. or more (the temperature range of the third step S3), the first sealant layer The seal strength between the second sealant layer 62 and the second sealant layer 72 is a relatively small seal strength of about 5 N / 15 mm or more and 8 N / 15 mm or less. On the other hand, when the first sealant layer 62 and the third sealant layer 73 are joined to each other by heating at a high temperature of 170 ° C. or more, the seal strength between the first sealant layer 62 and the third sealant layer 73 is as shown in FIG. As shown in FIG. 7, a relatively large seal strength of about 27 N / 15 mm or more and about 35 N / 15 mm or less is obtained.

  For this reason, in the package 10, the first sealant layer 62, the third sealant layer 73, and the second sealant layer 72 of the first film 20 and the second film overlap with each other in the third direction D3 ( For example, in a portion where the strong seal portion 40 and the second weak seal portion 52 are formed (see FIG. 4), when the first film 20 and the second film are bonded to each other, a portion having a high seal strength (strong). Both the seal portion 40) and the portion having the low seal strength (the second weak seal portion 52) can be formed simultaneously. That is, as described later, the strong seal portion 40 and the second weak seal portion 52 can be formed in the same heat sealing step. Specifically, in order to form the strong seal portion 40, the lower portion 22 (the first sealant layer 62) of the first film 20 and the second film 30 (at a high temperature (within the range of the temperature belonging to the third step S3)). When heating the third sealant layer 73), high-temperature heat within the temperature range belonging to the third stage S3 is generated by the upper portion 21 (first sealant layer 62) of the first film 20 and the second film 30 (second sealant layer). It is transmitted to the sealant layer 72). On the other hand, since the second sealant layer 72 is made of a resin material capable of exhibiting so-called easy-peeling property, the upper portion 21 of the first film 20 and the upper portion 21 at a high temperature (within the temperature range belonging to the third step S3) are used. Even when the second film 30 is heated, the second weak seal portion 52 having a relatively small seal strength can be formed. Thus, a portion having a high seal strength and a portion having a low seal strength can be formed in the same heat sealing step. For this reason, the heat sealing step can be facilitated.

  Further, for example, when the first sealant layer 62 and the second sealant layer 72 are joined to each other by heating at a low temperature of about 120 ° C. or more and 160 ° C. or less (the temperature range of the first step S1), The seal strength between the second sealant layer 62 and the second sealant layer 72 is a relatively small seal strength of about 5 N / 15 mm or more and 8 N / 15 mm or less. When the first sealant layer 62 and the third sealant layer 73 are joined to each other by heating at a low temperature of about 120 ° C. or more and 160 ° C. or less, the gap between the first sealant layer 62 and the third sealant layer 73 is reduced. The seal strength is a relatively small seal strength of about 5 N / 15 mm or more and 8 N / 15 mm or less, similar to the seal strength between the first sealant layer 62 and the second sealant layer 72 described above (see FIG. 7).

  As described above, the seal strength between the first sealant layer 62 and the second sealant layer 72 is relatively low regardless of the heating temperature. For this reason, when forming the first weak seal portion 51, the first sealant layer 62 and the second sealant layer 72 may be joined to each other by heating at a temperature belonging to the first stage S1. The first sealant layer 62 and the second sealant layer 72 may be joined to each other by heating at a temperature belonging to the third step S3.

  Next, the sealing strength when the first sealant layers 62 are joined to each other will be described.

  When the first sealant layers 62 are bonded to each other by heating at a high temperature of, for example, 170 ° C. or more, the seal strength between the first sealant layers 62 is equal to that of the first sealant layer 62 and the third sealant layer 73 described above. , A relatively large seal strength of about 27 N / 15 mm or more and 35 N / 15 mm or less (see FIG. 7). On the other hand, for example, when the first sealant layers 62 are joined to each other by heating at a low temperature of about 120 ° C. or more and 160 ° C. or less, the seal strength between the first sealant layers 62 is equal to that of the first sealant layer 62 described above. Similar to the seal strength between the third sealant layer 73 and the seal strength, a relatively small seal strength of about 5 N / 15 mm or more and 8 N / 15 mm or less (see FIG. 7). Therefore, when the third weak seal portion 53 is formed, the upper portion 21 (the first portion) of the first film 20 is kept at a low temperature of about 120 ° C. or more and 160 ° C. or less (within the temperature range belonging to the first step S1). The third weak seal portion 53 is formed by heating the sealant layer 62) and the lower portion 22 (first sealant layer 62).

  Here, the above-described seal strength between the first sealant layer 62 and the second sealant layer 72, the seal strength between the first sealant layer 62 and the third sealant layer 73, and the seal between the first sealant layer 62 Table 2 shows the relationship between the strength and the sealing temperature. In Table 2, “high” in the seal temperature means that the seal temperature is 170 ° C. or higher. Further, “low” in the seal temperature means that the seal temperature is 120 ° C. or more and 160 ° C. or less. Further, “strong” in the seal strength means that the seal strength is 27 N / 15 mm or more and 35 N / 15 mm or less. Further, "weak" in the seal strength means that the seal strength is 5 N / 15 mm or more and 8 N / 15 mm or less.

Method for Manufacturing First Film and Second Film Next, a method for manufacturing the first film 20 and the second film 30 according to the present embodiment will be described.

  First, a method for manufacturing the first film 20 will be described.

  First, a raw material of the first base material 61 wound in a roll shape is prepared. As described above, for example, a polyester-based resin such as polyethylene terephthalate, a polyamide-based resin such as nylon, a polypropylene-based, a polycarbonate-based, or polyacetal-based resin can be used as the first base material 61. Further, the first base material 61 is preferably a stretched film stretched in a uniaxial or biaxial direction. In this case, as the first substrate 61, for example, a biaxially stretched polyethylene terephthalate film (E5100, manufactured by Toyobo Co., Ltd.) may be used. Further, the thickness of the first base material 61 can be, for example, not less than 8 μm and not more than 50 μm, and may be, for example, 12 μm.

  Next, while continuously transporting the first base material 61 unwound from the roll of the first base material 61, an anchor coating agent is applied on the first base material 61 to form a first anchor coat layer 63. . As the anchor coating agent, for example, a two-component curable anchor coating agent (A3210 / A3070, manufactured by Mitsui Chemicals, Inc.) may be used.

  Next, the first sealant layer 62 is formed on the first anchor coat layer 63. At this time, the resin material forming the first sealant layer 62 is extrusion-coated on the first anchor coat layer 63. As described above, as the first sealant layer 62, as described above, low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear (linear) low density polyethylene (LLDPE), metallocene-based Ethylene-α-olefin copolymer, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer polymerized using a catalyst And a resin composed of one or more resins such as ethylene-methacrylic acid copolymer. As an example, the first sealant layer 62 may be made of, for example, an ionomer resin (Himilan (registered trademark) manufactured by DuPont-Mitsui Polychemicals Co., Ltd.) in which the molecules of an ethylene-methacrylic acid copolymer are cross-linked with metal ions. good. Further, the thickness of the first sealant layer 62 can be, for example, not less than 20 μm and not more than 150 μm, and may be, for example, 30 μm.

  Thus, the first film 20 is obtained.

  Next, a method for manufacturing the second film 30 will be described.

  First, a raw material of the second base material 71 wound in a roll shape is prepared. As the second base 71, a material substantially similar to the first base 61 described above can be used. Further, the thickness of the second base 71 may be substantially the same as that of the first base 61.

  Next, the second sealant layer 72 is formed on the second base 71 while continuously transporting the second base 71 unwound from the roll of the second base 71. At this time, first, a raw material of the second sealant layer 72 wound in a roll shape is prepared. Next, the second sealant layer 72 is laminated on the second base material 71 by, for example, a dry lamination method and bonded. In this case, first, an adhesive is applied on the second base material 71 and dried. Thereafter, the second sealant layer 72 unwound from the roll is supplied while being continuously conveyed, and the second sealant layer 72 is pressure-bonded to the second base material 71 to which the adhesive has been applied by a pressing roll. to paste together. As described above, the same resin material as that of the first sealant layer 62 can be used for the second sealant layer 72. As an example, as the second sealant layer 72, a resin material capable of exhibiting so-called easy peel property can be used. In this case, as the second sealant layer 72, a non-stretched coextruded multilayer film (7601EA, manufactured by Toray Industries, Inc.) may be used. Further, the thickness of the second sealant layer 72 can be, for example, not less than 20 μm and not more than 150 μm, and may be, for example, 30 μm. The adhesive layer 74 may use, for example, a two-component curable adhesive (A385 / A50, manufactured by Mitsui Chemicals, Inc.).

  Next, among the surfaces of the second base material 71, a second anchor coat layer 75 is formed on the surface opposite to the surface on which the second sealant layer 72 is formed, and on the second anchor coat layer 75, The third sealant layer 73 is extrusion-coated. Since the formation method, material, and thickness of the second anchor coat layer 75 and the third sealant layer 73 are substantially the same as the formation method, material, and thickness of the first anchor coat layer 63 and the first sealant layer 62 described above, respectively. Here, detailed description is omitted.

  Thus, the second film 30 is obtained.

Next, a method of manufacturing the package 10 according to the present embodiment will be described.

  First, a first film 20 having a foldable upper portion 21 and a lower portion 22 is prepared. Also, a second film 30 that overlaps the lower portion 22 of the first film 20 is prepared. At this time, first, the long first film 20 and the long second film 30 are prepared.

  Next, as shown in FIG. 8A, the long first film 20 and the long second film 30 are overlaid. At this time, the portion corresponding to the upper part 21 of the long first film 20 and the long second film 30 are overlapped. In this case, the first sealant layer 62 of the first film 20 (see FIG. 6A) and the second sealant layer 72 of the second film 30 (see FIG. 6B) face each other.

  Next, as shown in FIG. 8B, the upper part 21 of the first film 20 and the second film 30 are joined to each other, and the first part 21 between the upper part 21 of the first film 20 and the second film 30 is formed. A weak seal portion 51 is formed. At this time, the upper part 21 of the first film 20 and the second film 30 are heat-sealed. Thereby, the first weak seal portion 51 is formed. Although the illustrated example shows an example in which a plurality of first weak seal portions 51 are simultaneously formed, in the step of forming the first weak seal portions 51, the first weak seal portions 51 They may be formed one by one. The virtual line (two-dot chain line) shown in FIG. 8B indicates a region of the first film 20 and the second film 30 corresponding to each package 10 (FIG. 8C and FIG. 9 (a) and (b).

  In this case, for example, as the first sealant layer 62, an ionomer resin (Himilan (registered trademark) manufactured by DuPont-Mitsui Polychemicals Co., Ltd.) in which the molecules of the ethylene-methacrylic acid copolymer are cross-linked with metal ions is used. When a non-stretched coextruded multilayer film (7601EA, manufactured by Toray Industries, Inc.) is used as the second sealant layer 72, the sealing temperature when the upper part 21 of the first film 20 and the second film 30 are joined to each other is For example, the temperature may be as low as about 120 ° C. or more and 175 ° C. or less. In this case, the seal strength of the first weak seal portion 51, that is, the seal strength between the first sealant layer 62 and the second sealant layer 72, is relatively small between about 1 N / 15 mm and 10 N / 15 mm. Become. The above-mentioned sealing temperature is appropriately set such that the sealing strength of the first weak seal portion 51 is about 1 N / 15 mm or more and 10 N / 15 mm or less depending on the material used for the first sealant layer 62 and the second sealant layer 72. Can be changed.

  Next, the lower portion 22 of the first film 20 and the second film 30 are joined to each other, and between the lower portion 22 of the first film 20 and the second film 30 along the side edges 33 of the second film 30. An extended strong seal portion 40 is formed. At this time, first, as shown in FIG. 8C, the first film 20 is folded along the folding line 23 as a fold line. Thus, the lower portion 22 of the first film 20 and the second film 30 are overlaid. In this case, the lower part 22 of the first film 20 and the second film 30 are composed of the first sealant layer 62 of the first film 20 (see FIG. 6A) and the third sealant layer 73 of the second film 30 (see FIG. 6B). And overlap with each other. Then, the lower portion 22 of the first film 20 and the second film 30 are heat-sealed. Thereby, as shown in FIG. 9A, a strong seal portion 40 is formed. At this time, for example, as the first sealant layer 62 and the third sealant layer 73, an ionomer resin (Himilan (registered trademark) manufactured by Mitsui DuPont Polychemical Co., Ltd.) in which the molecules of the ethylene-methacrylic acid copolymer are cross-linked with metal ions. In the case where)) is used, the sealing temperature at the time of joining the lower portion 22 of the first film 20 and the second film 30 to each other is, for example, a high temperature of 180 ° C. or more. Thereby, the sealing strength of the strong seal portion 40, that is, the sealing strength between the first sealant layer 62 and the third sealant layer 73 is a relatively large sealing strength of about 23 N / 15 mm or more and 150 N / 15 mm or less. In this case as well, the above-mentioned sealing temperature is set so that the sealing strength of the strong sealing portion 40 is about 23 N / 15 mm or more and 150 N / 15 mm or less depending on the material used for the first sealant layer 62 and the third sealant layer 73. Can be changed as appropriate.

  By the way, in the state shown in FIG. 8C, of the first film 20 and the second film 30, the upper part 21 of the first film 20, the second film 30, and the lower part 22 of the first film 20 are different. In the third direction D3, overlapping portions are provided (see FIG. 4). That is, a portion where the first sealant layer 62 of the first film 20, the second sealant layer 72 of the second film, and the third sealant layer 73 of the second film overlap each other in the third direction D3 is provided. Thereby, when the above-mentioned strong seal part 40 is formed between the lower part 22 of the first film 20 and the second film 30, the upper part 21 of the first film 20 and the second film 30 are joined to each other. Between the upper part 21 of the first film 20 and the second film 30, a seal part extending along both side edges 33 of the second film 30 is formed.

  Here, among the first sealant layers 62 of the first film 20, the first sealant layer 62 of the upper part 21 is joined to the second sealant layer 72 of the second film 30, as described above. The second sealant layer 72 is made of a resin material capable of exhibiting a so-called easy-peel property. Thereby, for example, even when the upper part 21 of the first film 20 and the second film 30 are bonded to each other at a high temperature of 180 ° C. or more, the upper part 21 of the first film 20 and the second film 30 A seal portion having a relatively small seal strength is formed between them. Therefore, as shown in FIG. 9A, a second weak seal portion 52 extending along both side edges 33 of the second film 30 is provided between the upper portion 21 of the first film 20 and the second film 30. It is formed. In this case, the seal strength of the second weak seal portion 52, that is, the seal strength between the first sealant layer 62 and the second sealant layer 72, is relatively small between 1N / 15mm and 10N / 15mm. Become. As described above, in the present embodiment, the strong seal portion 40 having a large seal strength and the second weak seal portion 52 having a small seal strength can be formed in the same step. For this reason, the heat sealing step can be facilitated.

  Next, as shown in FIG. 9B, the upper portion 21 and the lower portion 22 of the first film 20 are joined to each other, and between the upper portion 21 and the lower portion 22, both side edges 26 of the lower portion 22 are provided. A third weak seal portion 53 extending along is formed. At this time, the third weak seal portion 53 is formed by performing heat sealing on the upper portion 21 and the lower portion 22 of the first film 20. At this time, the sealing temperature when forming the third weak seal portion 53 is lower than the seal temperature when forming the strong seal portion 40 described above. In this case, for example, when the first sealant layer 62 is made of an ionomer resin (Himilan (registered trademark) manufactured by DuPont-Mitsui Polychemicals Co., Ltd.) in which the molecules of the ethylene-methacrylic acid copolymer are crosslinked with metal ions. The sealing temperature at the time of joining the upper part 21 and the lower part 22 of the first film 20 to each other is set to a low temperature of, for example, about 120 ° C. or more and 160 ° C. or less. Thereby, the seal strength of the third weak seal portion 53, that is, the seal strength between the first sealant layers 62 is a relatively small seal strength of about 1 N / 15 mm or more and 10 N / 15 mm or less. The above-mentioned sealing temperature can be appropriately changed depending on the material used for the first sealant layer 62 so that the sealing strength of the third weak seal portion 53 is about 1 N / 15 mm or more and about 10 N / 15 mm or less.

  Then, as shown in FIG. 9C, the first film 20 and the second film 30 are cut into a shape corresponding to each individual package 10 to be singulated.

  Thus, the package 10 shown in FIG. 1 can be obtained.

  The thus obtained package 10 is filled with the contents from the opening of the second edge 12. Then, the opening of the second edge 12 of the package 10 is heat-sealed and hermetically sealed, so that the second edge sealing portion 41 is formed. Thus, the package 10 containing the contents is obtained.

  As described above, according to the present embodiment, between the upper portion 21 of the first film 20 and the second film 30, the first weak seal portion that joins the upper portion 21 and the second film 30 to each other. 51 is provided, extends between the lower portion 22 of the first film 20 and the second film 30 along both side edges 33 of the second film 30, and is connected to the lower portion 22 of the first film 20 and the second film 30. Are provided. Thus, when the user opens the package 10, the package 10 can be easily opened from the first weak seal portion 51 and the second weak seal portion 52. In addition, since the strong seal portions 40 extending along the both side edges 33 of the second film are provided, the package 10 is moved from an unintended location by a force acting on the package 10 during transportation of the package 10 or the like. The problem of being opened can be suppressed.

  Further, according to the present embodiment, between the upper part 21 of the first film 20 and the second film 30, it extends along both side edges 33 of the second film 30, and the upper part 21 and the second film 30 Are provided with a second weak seal portion 52 that joins the two. Thereby, while the sealing property of the package 10 can be improved, when the user opens the package 10, the package 10 can be easily opened.

  Further, according to the present embodiment, between upper part 21 and lower part 22 of first film 20, it extends along both side edges 27 of lower part 22 and joins upper part 21 and lower part 22 to each other. A third weak seal portion 53 is provided. Thereby, the sealing performance of the package 10 can be further improved, and the package 10 can be easily opened when the user opens the package 10.

Modification of Package Next, a modification of the package 10 according to the present embodiment will be described with reference to FIGS. 10 to 13, the same parts as those in FIGS. 1 to 9 (a) to 9 (c) are denoted by the same reference numerals, and detailed description is omitted.

(First Modification)
In the package 10 shown in FIG. 10, a first weak seal portion 51 that joins the upper portion 21 and the lower portion 22 to each other is provided between the upper portion 21 and the lower portion 22 of the first film 20. That is, the first weak seal portion 51 is formed between the first sealant layers 62. In the present modification, the first weak seal portion 51 is formed in substantially the entire region other than the region where the third weak seal portion 53 is formed, in the region where the upper portion 21 and the lower portion 22 of the first film 20 overlap. Have been. In the present modification, the second film 30 is notched so that the first edge 31 of the second film 30 extends in a V-shape. That is, the first edge 31 of the second film 30 extends so that the V-shaped tip portion faces the second edge 12 of the package 10. For this reason, the first weak seal portion 51 described above is formed in a pentagonal shape.

  Here, Table 3 shows a relationship between each sealant layer and a seal portion formed between each sealant layer in the package 10 according to the present modification. As shown in Table 3, in the package 10 according to the present modification, the seal portion formed between the first sealant layer 62 and the second sealant layer 72 is the second weak seal portion 52. The seal formed between the first sealant layer 62 and the third sealant layer 73 is the strong seal 40, and the seal formed between the first sealant layers 62 is the first weak seal. 51 and a third weak seal portion 53.

  In such a package 10, for example, in the step of forming the first weak seal portion 51 described with reference to FIG. 8B, the upper portion 21 and the lower portion 22 of the first film 20 are heat-sealed. Thereby, the upper part 21 and the lower part 22 of the first film 20 are joined to each other, and the first weak seal part 51 is formed between the upper part 21 and the lower part 22.

  Also in this modification, when the user opens the package 10, the package 10 can be easily opened from the first weak seal portion 51, the second weak seal portion 52, and the third weak seal portion 53. . In addition, since the strong seal portions 40 extending along the both side edges 33 of the second film are provided, the package 10 is moved from an unintended location by a force acting on the package 10 during transportation of the package 10 or the like. The problem of being opened can be suppressed.

  In the present modification, the second film 30 is notched so that the first edge 31 of the second film 30 extends in a V-shape. Thus, the amount of resin for producing the second film 30 can be reduced.

Modified Example of Manufacturing Method of Package Next, a modified example of the manufacturing method of the package 10 according to the present modified example will be described with reference to FIGS. 11A to 11C and FIGS. 12A and 12B. In FIGS. 11 (a)-(c) and 12 (a)-(b), the same parts as those in FIGS. 8 (a)-(c) and 9 (a)-(c) are denoted by the same reference numerals. The detailed description is omitted.

  First, as shown in FIG. 11A, a long first film 20 and a long second film 30 are prepared, and a portion corresponding to the lower portion 22 of the first film 20 is provided. The second film 30 is overlaid. In this case, the first sealant layer 62 of the first film 20 and the third sealant layer 73 of the second film 30 are overlapped so as to face each other. In the present modification, the first edge 31 of the long second film 30 is cut out so as to extend in a V-shape in a region corresponding to each package 10. The imaginary line (two-dot chain line) shown in FIG. 11A indicates a region of the first film 20 and the second film 30 corresponding to each package 10 (FIG. 11B-). (The same applies to (c) and FIG. 12 (a)).

  Next, as shown in FIG. 11B, the lower portion 22 of the first film 20 and the second film 30 are joined to each other, and a strong force is applied between the lower portion 22 of the first film 20 and the second film 30. The seal part 40 is formed. At this time, the lower part 22 of the first film 20 and the second film 30 are heat-sealed to form the strong seal part 40.

  Next, the upper portion 21 and the lower portion 22 of the first film 20 are joined to each other, and a first weak seal portion 51 and a third weak seal portion 53 are provided between the upper portion 21 and the lower portion 22 of the first film 20. To form Further, the upper portion 21 of the first film 20 and the second film 30 are joined to each other, and a second weak seal portion 52 is formed between the upper portion 21 of the first film 20 and the second film 30. At this time, first, as shown in FIG. 11C, the first film 20 is folded along the folding line 23 as a fold line. Thus, the upper part 21 of the first film 20 and the second film 30 are overlaid. At this time, the upper portion 21 of the first film 20 and the second film 30 overlap with each other so that the first sealant layer 62 of the first film 20 and the second sealant layer 72 of the second film 30 face each other.

  Next, heat sealing is performed on the upper portion 21 and the lower portion 22 of the first film 20. Thereby, as shown in FIG. 12A, a first weak seal portion 51 and a third weak seal portion 53 are formed. Similarly, the upper part 21 of the first film 20 and the second film 30 are heat-sealed. Thereby, as shown in FIG. 12A, the second weak seal portion 52 is formed.

  Then, as shown in FIG. 12 (b), the first film 20 and the second film 30 are cut into a shape corresponding to each of the individual packages 10 and singulated.

  Also in this case, the package 10 shown in FIG. 10 can be obtained.

(Second Modification)
In the package 10 shown in FIG. 13, the first film 20 is notched such that the edge 24 of the upper portion 21 of the first film 20 extends in a V-shape. That is, the edge 24 of the upper portion 21 of the first film 20 extends along the first edge 31 of the second film 30, and the V-shaped tip portion faces the second edge 12 of the package 10. So that it extends. Further, in the present modification, the above-mentioned second weak seal portion 52 is not provided.

  Also in this modification, when the user opens the package 10, the package 10 can be easily opened from the first weak seal portion 51 and the third weak seal portion 53. In addition, since the strong seal portions 40 extending along the both side edges 33 of the second film are provided, the package 10 is moved from an unintended location by a force acting on the package 10 during transportation of the package 10 or the like. The problem of being opened can be suppressed.

  In the present modification, the first film 20 is cut out so that the edge 24 of the upper portion 21 of the first film 20 extends in a V-shape. Thereby, the amount of resin for producing the first film 20 can be further reduced.

  In this modification, the second laminate 70 forming the second film may have the same configuration as the first laminate 60. That is, in this modification, the upper part 21 of the first film 20 and the second film 30 are not joined to each other. Therefore, the second laminate 70 constituting the second film may not have the second sealant layer 72 and the adhesive layer 74.

  A plurality of constituent elements disclosed in the above-described embodiments and modified examples can be appropriately combined as needed. Alternatively, some components may be deleted from all the components shown in the above-described embodiment and the modification.

10 Package 20 First film 21 Upper part 22 Lower part 27 Side edge 30 Second film 33 Side edge 40 Strong seal part 51 First weak seal part 52 Second weak seal part 53 Third weak seal part

Claims (15)

In the package,
A first film having a foldable upper portion and a lower portion,
A second film overlying the lower portion of the first film,
The upper portion of the first film overlaps the second film,
A first weak seal portion that joins the upper portion and the second film to each other is provided between the upper portion of the first film and the second film, or the upper portion of the first film is A first weak seal portion that joins the upper portion and the lower portion to each other between the portion and the lower portion;
A strong seal extending between the lower portion of the first film and the second film, along both side edges of the second film, and joining the lower portion of the first film and the second film to each other. A package provided with a part.   The package according to claim 1, wherein the sealing strength of the strong seal portion is 23N / 15mm or more and 150N / 15mm or less.   The package according to claim 1 or 2, wherein the first weak seal portion has a seal strength of 1 N / 15 mm or more and 10 N / 15 mm or less.   A second weak seal portion is provided between the upper portion of the first film and the second film and extends along both side edges of the second film and joins the upper portion and the second film to each other. The package according to any one of claims 1 to 3, wherein the package is provided.   The package according to claim 4, wherein the second weak seal portion has a seal strength of 1 N / 15 mm or more and 10 N / 15 mm or less.   A third weak seal portion is provided between the upper portion and the lower portion of the first film, the third weak seal portion extending along both side edges of the lower portion and joining the upper portion and the lower portion to each other. The package according to any one of claims 1 to 5.   The package according to claim 6, wherein the third weak seal portion has a seal strength of 1 N / 15 mm or more and 10 N / 15 mm or less. In the method for manufacturing a package,
Providing a first film having a foldable upper portion and a lower portion;
Providing a second film that overlies the lower portion of the first film;
The upper part of the first film and the second film are joined to each other, and a first weak seal portion is formed between the upper part of the first film and the second film; Bonding the upper portion and the lower portion of the film to each other and forming a first weak seal portion between the upper portion and the lower portion;
A strong seal that joins the lower portion of the first film and the second film to each other, and extends between the lower portion of the first film and the second film along both side edges of the second film. Forming a part.   The method for manufacturing a package according to claim 8, wherein the sealing strength of the strong seal portion is 23 N / 15 mm or more and 150 N / 15 mm or less.   The method for manufacturing a package according to claim 8 or 9, wherein the first weak seal portion has a seal strength of 1 N / 15 mm or more and 10 N / 15 mm or less.   The upper part of the first film and the second film are joined to each other, and a second weak seal part extending along the both side edges of the second film is provided between the upper part and the second film. The method for manufacturing a package according to any one of claims 8 to 10, further comprising a forming step.   The method for manufacturing a package according to claim 11, wherein the seal strength of the second weak seal portion is 1 N / 15 mm or more and 10 N / 15 mm or less.   Bonding the upper portion and the lower portion of the first film to each other, and forming a third weak seal portion extending along both side edges of the lower portion between the upper portion and the lower portion. The method for manufacturing a package according to claim 8, further comprising:   The method for manufacturing a package according to claim 13, wherein the third weak seal portion has a seal strength of 1 N / 15 mm or more and 10 N / 15 mm or less.   The method for manufacturing a package according to claim 13, wherein a sealing temperature when forming the third weak seal portion is lower than a seal temperature when forming the strong seal portion.