JP2018171759A - Sheet material, pressure difference molding container and production method of sheet material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet material, a pressure difference molding container and a production method of a sheet material capable of achieving more stable cutting.SOLUTION: A sheet material 1A is a long sheet material 1A used for a sheet for a pressure difference molding container, the sheet material comprising a base material layer 101 and a sealant layer 102 having tension elastic modulus lower than that of the base material layer 101, in the base material layer 101, there is formed a triangle groove 17A in which an angle formed by a pair of inside surfaces 171 is 30°-90°, to depth at which the triangle groove does not contact the sealant layer 102.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a sheet material, a differential pressure forming container, and a method for manufacturing the sheet material.

  Containers and packages that contain contents such as liquids are required to hold the contents in a sealed state. Patent Document 1 discloses an example of a conventional container package that manufactures such a container package. In the container package disclosed in this document, a differential pressure molded container formed by differential pressure molding of a sheet material is used. This differential pressure forming container is composed of a sheet including a pair of main plate portions each having a storage portion that defines a storage space. In the container package, the contents are accommodated in the accommodating space of the differential pressure molded container. Out of the pair of main plate portions, peripheral regions surrounding the housing portion constitute a seal portion joined by heat sealing. The accommodation space is sealed by the seal portion, and the contents can be held in a sealed state.

  As a method of opening such a container package, for example, a method of forming a planned cutting line on a part of the sheet can be mentioned. Examples of such a planned cutting line include those formed by cutting the sheet material so as not to penetrate in the thickness direction. However, if there are variations in the cutting operation, the depth of the planned cutting line becomes deeper or shallower. If the planned cutting line becomes too deep, the planned cutting line may be unintentionally cut when the container / package is displayed at a storefront. On the other hand, if the depth of the planned cutting line becomes too shallow, opening becomes difficult. Further, chips are generated in the cutting operation. When the chips are mixed into the contents, there is a problem that the product quality is seriously deteriorated.

JP-A-8-174702

  The present invention has been conceived under the circumstances described above, and provides a sheet material, a differential pressure forming container, and a sheet material manufacturing method capable of realizing more stable cutting. Let it be an issue.

  The sheet material provided by the first aspect of the present invention is a long sheet material used for a differential pressure-forming container sheet, and has a tensile elastic modulus higher than that of the first resin layer and the first resin layer. A triangular groove having an angle formed by a pair of inner side surfaces of 30 ° to 90 ° is formed in the first resin layer at a depth that does not contact the second resin layer. It is characterized by that.

  In preferable embodiment of this invention, the said 1st resin layer contains the surface layer which consists of an unstretched film provided in the opposite side to the said 2nd resin layer with respect to the said main layer and the said main layer.

  In a preferred embodiment of the present invention, the pair of inner side surfaces are constituted by the surface layer.

  In a preferred embodiment of the present invention, a barrier layer interposed between the first resin layer and the second resin layer is further provided.

  In a preferred embodiment of the present invention, an angle formed by the pair of inner side surfaces is 40 ° to 60 °.

  The differential pressure molded container provided by the second aspect of the present invention is a differential pressure molded container formed by a differential pressure molded container sheet using the sheet material provided by the first aspect of the present invention. The triangular groove constitutes a planned cutting line.

  The sheet material manufacturing method provided by the third aspect of the present invention is a sheet material manufacturing method provided by the first aspect of the present invention, wherein the first resin layer, the second resin layer, A pressure roller having a triangular convex portion with a triangular cross section that extends in the circumferential direction and protrudes radially outward is supported by the support portion from the second resin layer side and the first resin layer side. It is characterized by having a groove forming step of forming a triangular groove in the first resin layer by pressing from above.

  In a preferred embodiment of the present invention, the pressing roller has a circumferential surface that is perpendicular to the radial direction and extends along the circumferential direction, and the triangular protrusion protrudes from the circumferential surface. Item 8. A method for producing a sheet material according to Item 7.

  According to the present invention, the triangular groove is formed in the sheet material. The triangular groove is a linear recess formed on the first resin layer side, in which an angle formed by the pair of inner side surfaces is 30 ° to 90 °. Such a triangular groove is formed by pressing the triangular convex portion of the pressing roller against the sheet material. For this reason, when forming the triangular groove, it is possible to avoid generation of chips and the like. Moreover, making the pressing roller pressing uniform is easier to achieve than making the cutting depth uniform in a method of cutting the sheet material with a cutting blade, for example. For this reason, the depth of the triangular groove can be further stabilized. Further, the planned cutting line constituted by the triangular grooves is compared with the planned cutting line formed by cutting with a cutting blade, for example, when the container package is displayed at a storefront, etc. There is little risk that the line will be cut unintentionally. Therefore, according to the present invention, more stable cutting can be performed.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a perspective view which shows an example of the manufacturing method of the sheet material which concerns on this invention. It is a principal part expanded sectional view which shows the sheet material used for an example of the manufacturing method of the sheet material which concerns on this invention. It is principal part sectional drawing which shows an example of the manufacturing method of the sheet material which concerns on this invention. It is a principal part expanded sectional view which shows an example of the manufacturing method of the sheet material which concerns on this invention. It is a principal part expanded sectional view which shows an example of the sheet material which concerns on this invention. It is a perspective view which shows an example of the manufacturing method of the differential pressure molding container which concerns on this invention. It is sectional drawing which follows the VII-VII line of FIG. It is sectional drawing which follows the VIII-VIII line of FIG. It is a perspective view which shows an example of the container package body in which the differential pressure molding container which concerns on this invention was used. It is sectional drawing which follows the XX line of FIG. It is a principal part expanded sectional view in alignment with the XX line of FIG. It is a principal part expanded sectional view in alignment with the XX line of FIG. It is a cross-sectional photograph which shows the sheet material which concerns on this invention. It is a cross-sectional photograph which shows the sheet material of a comparative example.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 to 5 show an example of a sheet material manufacturing method and sheet material according to the present invention.

  As shown in FIG. 1, the sheet material manufacturing method of the present embodiment includes a groove forming step of forming triangular grooves 17A and 17B in the sheet material 1A using the support portion 5 and the pressure rollers 6A and 6B.

  The sheet material 1A is usually a long sheet material composed of a resin film. 1 A of sheet materials are sequentially sent out from the sheet roll 10A wound up in roll shape as shown, for example in FIG. The sheet material 1A is required to have basic performance as a package, such as impact resistance, wear resistance, and heat resistance. Further, since a seal part 14 described later formed for manufacturing a differential pressure forming container A1 described later is usually formed by heat sealing, the sheet material 1A is also required to have heat sealability. Moreover, when high gas barrier property and light-shielding property are required for the sheet material 1A, it will be described later between a later-described base material layer and a later-described sealant layer, or when the base material layer has a multi-layer structure, between the layers. It is preferable to provide a barrier layer. In addition, you may provide barrier property to the base material layer itself.

  FIG. 2 is an enlarged cross-sectional view of a main part showing the sheet material 1A of the present embodiment. The sheet material 1 </ b> A of this embodiment includes a base material layer 101, a sealant layer 102, a barrier layer 103, and an auxiliary layer 104. The base material layer 101 is a layer that exhibits impact resistance, abrasion resistance, heat resistance, and the like required for the sheet material 1A, and is an example of the first resin layer of the present invention. The sealant layer 102 is a layer that exhibits heat sealing properties, and is an example of the second resin layer of the present invention. The barrier layer 103 is a layer that exhibits gas barrier properties and light shielding properties. The auxiliary layer 104 is a layer for increasing the toughness of the container, for example.

  In addition, lamination | stacking of these each layer can be performed by the conventional lamination method, for example, the co-extrusion lamination, the dry lamination by an adhesive agent, the heat lamination which adhere | attaches with a heat | fever by pinching | interposing a heat adhesive layer. In addition, the sheet material 1A may be formed by bonding each of the above-described layers as a single layer, or a material such as a molten resin for forming another layer on a certain layer, for example. The sheet material 1A in which a plurality of layers are laminated may be formed by cooling the material after being arranged by extrusion or coating.

  Here, constituent materials of the base material layer 101, the sealant layer 102, the barrier layer 103, and the auxiliary layer 104 are illustrated.

  Examples of the resin constituting the base material layer 101 include polyester (polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polycarbonate (PC), etc.), polystyrene (general-purpose polystyrene (GPPS), High impact polystyrene (HIPS), etc., polyolefin (polyethylene (PE), polypropylene (PP), etc.), polyamide (nylon-6, nylon-66, etc.), polyacrylonitrile (PAN), polyimide (PI), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polymethyl methacrylate (PMMA), polyether sulfone (PES) and the like. The base material layer 101 may be constituted by one or two or more stretched or unstretched films made of these resins. In the illustrated example, the base material layer 101 includes a main layer 1011 and a surface layer 1012. Note that unlike the present example, the base material layer 101 may be constituted only by the main layer 1011. The main layer 1011 is a layer that mainly exhibits the impact resistance, wear resistance, heat resistance, and the like of the base material layer 101. The surface layer 1012 is a print layer for printing characters and graphics to be displayed on the sheet material 1A, for example, and is laminated on the opposite side of the main layer 1011 from the sealant layer 102 to form the outermost layer. When printing is performed on the inner surface of the surface layer 1012, the printed portion can be protected by the surface layer 1012. As the resin film constituting the main layer 1011, for example, an unstretched film made of polyethylene terephthalate (PET), impact-resistant polystyrene (HIPS), or the like is selected. As the resin film constituting the surface layer 1012, an unstretched film made of, for example, polypropylene (PP), polyethylene terephthalate (PET), nylon (NY), or the like is selected. The thickness of the main layer 1011 is, for example, 150 to 450 μm, and is 350 μm in this example. The thickness of the surface layer 1012 is thinner than the main layer 1011 and is, for example, 10 to 150 μm, and in this example, 40 μm. The thickness of the base material layer 101 is, for example, 160 to 500 μm, and is 390 μm in this example. In addition, the base material layer 101 may be comprised only by the main layer 1011, for example. In this case, the main layer 1011 may be printed.

  The resin constituting the sealant layer 102 is preferably an olefin resin, and more preferably a polyethylene resin. More specifically, as the olefin resin constituting the sealant layer 102, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), ethylene-propylene copolymer (EP), unstretched polypropylene (CPP) Biaxially stretched nylon (ON), ethylene-olefin copolymer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-vinyl acetate copolymer (EVA), etc. Can be mentioned. The sealant layer may be constituted by one or two or more stretched or unstretched films made of these resins. The sealant layer 102 is, for example, 10 to 60 μm, and is 30 μm in this example.

  Here, the base material layer 101 is a hard layer compared to the sealant layer 102, and the sealant layer 102 is a soft layer compared to the base material layer 101. The hard and soft indicators are not particularly limited as long as the relative hard / soft relationship between the base material layer 101 and the sealant layer 102 can be defined, and the base material layer 101 and the sealant layer 102 are made of a general resin. In this case, for example, the hard / soft relationship is determined by the tensile modulus. Taking an example of the tensile elastic modulus of the base material layer 101 and the sealant layer 102, the tensile elastic modulus of the base material layer 101 is 1,000 MPa or more, preferably 1,500 MPa or more, and the tensile elastic modulus of the sealant layer 102 is , 900 MPa or less, preferably 800 MPa or less. These tensile elastic moduli are values obtained by measuring with reference to JIS K7161-1 and JIS K7127.

  As the barrier layer 103, a metal thin film such as aluminum, or a resin film such as vinylidene chloride (PVDC) or ethylene-vinyl alcohol copolymer (EVOH), or any synthetic resin film (for example, a base material layer) Can be exemplified by a film obtained by vapor-depositing (or sputtering) an inorganic oxide such as aluminum, aluminum oxide, or silica. The thickness of the barrier layer 103 is, for example, 1 to 50 μm, and in this example, 10 μm.

  The auxiliary layer 104 is a layer for increasing the toughness of the container, and is provided between the sealant layer 102 and the barrier layer 103. Examples of the auxiliary layer 104 include nylon. The thickness of the auxiliary layer 104 is, for example, 5 to 40 μm, and in this example, 20 μm. Note that the auxiliary layer 104 may not be provided between the sealant layer 102 and the barrier layer 103.

  The support part 5 supports the sheet material 1A from the sealant layer 102 side. In the illustrated example, the support portion 5 has a support surface 51. The support surface 51 is a flat surface that is parallel to the xy plane. The sheet material 1A sent out from the sheet roll 10A is conveyed in the x direction by a predetermined roller or the like while being supported by the support surface 51 of the support portion 5. The support 5 is not particularly limited as long as it supports the sheet material 1A to be conveyed, and may be, for example, a roller that supports the sheet material 1A from the sealant layer 102 side.

  The pressing rollers 6A and 6B are tools for forming the triangular grooves 17A and 17B in the sheet material 1A. As shown in FIGS. 1 and 3, in this embodiment, a pair of pressing rollers 6A and one pressing roller 6B are used. The pressing roller 6B is disposed between the pair of pressing rollers 6A. However, such a configuration is an example of a configuration for realizing the manufacturing method of the present invention. The configuration may include only a pair of pressing rollers 6A, or may include a larger number of pressing rollers 6A or pressing rollers 6B. In the illustrated example, the pair of pressing rollers 6 </ b> A and the pressing rollers 6 </ b> B are rotatably supported by the shaft 63. The pair of pressing rollers 6A and the pressing roller 6B may be supported by independent support members.

  In the illustrated example, the pressure roller 6 </ b> A and the pressure roller 6 </ b> B have the same configuration, and have a peripheral surface 61 and a triangular convex portion 62. The circumferential surface 61 is a surface that is perpendicular to the radial direction when the direction in which the shaft 63 extends is defined as the axial direction, and that extends along the circumferential direction. Further, the portion of the peripheral surface 61 that faces the support surface 51 of the support portion 5 is parallel to the support surface 51. The pressure roller 6A and the pressure roller 6B have a shaft 63 so that the distance between the peripheral surface 61 and the support surface 51 of the support portion 5 is substantially the same as the thickness of the sheet material 1A or slightly smaller than the thickness of the sheet material 1A. Is supported by.

  The triangular convex part 62 protrudes from the circumferential surface 61 in the radial direction, and is provided extending in the circumferential direction. The triangular convex portion 62 has a pair of outer side surfaces 621. The angle α formed by the pair of outer surfaces 621 is 30 ° to 90 °, preferably 40 ° to 60 °. In this example, the preferred angle α is set to 50 °. The height (diameter direction dimension) of the triangular convex part 62 is 160-500 micrometers, for example. In this example, the distance between each of the triangular convex portions 62 of the pair of pressing rollers 6A and the triangular convex portion 62 of the pressing roller 6B is set to be the same.

  As shown in FIG. 1, the sheet material 1 </ b> A is conveyed so as to pass between the support surface 51 of the support portion 5 and the pair of pressing rollers 6 </ b> A and 6 </ b> B. As a result, as shown in FIGS. 3 and 4, the pair of pressing rollers 6A and the peripheral surface 61 of the pressing roller 6A come into contact with the surface of the sheet material 1A. The roller 6B is pressed. By this pressing, in this example, a pair of triangular grooves 17A and triangular grooves 17B are formed in the sheet material 1A. The pair of triangular grooves 17A and triangular grooves 17B are parallel to each other, and each is along the x direction. A triangular groove 17B is located between the pair of triangular grooves 17A, and the distance between each of the pair of triangular grooves 17A and the triangular groove 17B is the same.

  Since the pressing roller 6A and the pressing roller 6B have the same configuration, as shown in FIG. 5, the triangular groove 17A and the triangular groove 17B have the same configuration. The triangular groove 17 </ b> A and the triangular groove 17 </ b> B are recessed from the base material layer 101 side toward the sealant layer 102 and have a pair of inner side surfaces 171. The angle β formed by the pair of inner side surfaces 171 is 30 ° to 90 °, preferably 40 ° to 60 °. In this example, the angle β is set to 50 °, which is a suitable angle, corresponding to the angle α of the pressing rollers 6A and 6B. The depth of the triangular grooves 17A and 17B is set to a depth that does not penetrate the base material layer 101, and is, for example, 140 to 490 μm. In this example, the depth of the triangular grooves 17A and 17B is set to a depth at which the thickness of the portion remaining on the sealant layer 102 side of the triangular grooves 17A and 17B in the base material layer 101 is 50 μm as a suitable depth. Has been. That is, in the case of this example in which the thickness of the base material layer 101 is 390 μm, the preferred depth of the triangular grooves 17A and 17B is 340 μm. The pair of inner side surfaces 171 is constituted by the surface layer 1012, and in the illustrated example, all of them are constituted by the surface layer 1012. Note that the pair of inner side surfaces 171 may be constituted by the main layer 1011 at the boundary portion between the pair of inner side surfaces 171, that is, at the deepest portion of the triangular grooves 17 </ b> A and 17 </ b> B and the vicinity thereof.

  Next, a method for manufacturing a differential pressure molded container (container package) using the sheet material 1A having a pair of triangular grooves 17A and triangular grooves 17B will be described below with reference to FIGS.

  First, as shown in FIG. 6A, the sheet material 1 </ b> A is bent into a form having a pair of main plate portions 11 and folded portions 12. In this bending, the sheet material 1A is bent so that the base material layer 101 becomes the outer side and the sealant layer 102 becomes the inner side in the triangular groove 17B. That is, the triangular groove 17 </ b> B constitutes a scheduled folding line 120 for easily and reliably folding the sheet material 1 </ b> A. The folded portion 12 is formed by folding the sheet material 1 </ b> A along the planned folding line 120. The folded portion 12 is a portion where the sheet material 1A is bent at the lower end in the y direction. The pair of main plate portions 11 are connected via the folded portion 12 and face each other in the z direction. The pair of triangular grooves 17A constitutes a pair of scheduled cutting lines 13 for easily and surely cutting in opening the differential pressure forming container A1 described later. After the folded portion 12 is formed, the pair of planned cutting lines 13 coincide with each other when viewed in the z direction.

  Next, heat sealing is applied to the pair of main plate portions 11. In the illustrated example, a predetermined portion of the pair of main plate portions 11 is heated by a sealing mold 72 having a heating function. Thereby, the sealant layers 102 of the pair of main plate portions 11 are heat-sealed, and the seal portion 14 is formed. In the figure, for convenience of understanding, the seal portion 14 is hatched with a plurality of discrete points. A portion of the main plate portion 11 that is not heat-sealed is a portion that should become the accommodating portion 111. The unsealed portion has an extending portion that reaches the upper end in the y direction of the main plate portion 11.

  Next, a gas such as compressed air or nitrogen gas from the unsealed extended portion that reaches the upper end in the y direction of the main plate portion 11 in a state where the sheet material 1A is sandwiched between molds (not shown) having predetermined recesses. Infuse. By this differential pressure molding, as shown in FIG. 6B and FIG. 7, the accommodating portion 111 is formed in the pair of main plate portions 11. At this time, a filling port 16 is formed above the main plate portion 11 in the y direction. The filling port 16 connects the accommodation space 19 and the outside.

  Next, as shown in FIGS. 6C and 8, the contents 3 are filled into the accommodation space 19. This filling is performed using a nozzle 73, for example. That is, the nozzle 73 is inserted from the filling port 16, and the content 3 is discharged from the nozzle 73. Thereby, the content 3 is accommodated in the accommodating space 19.

  Next, as shown in FIG. 6D, heat sealing is performed on the filling port 16 of the pair of main plate portions 11 and the periphery thereof using, for example, a sealing die 74. As a result, the filling port 16 is closed, resulting in a filling port mark 161 shown in FIG. In FIG. 6 (e), the accommodation space 19 is sealed by the seal portion 14, and the content 3 is accommodated in the accommodation space 19. Thereafter, by cutting a predetermined portion of the sheet material 1A, the differential pressure-molded container A1 and the container package B1 using the differential pressure-molded container A1 shown in FIGS. 9 to 12 are obtained. The differential pressure molded container A1 (container package B1) has a folded portion 12. Unlike this, the folded portion 12 may be removed in the cutting step.

  A container package B1 shown in FIGS. 9 to 12 includes a differential pressure molding container A1 and a content 3 accommodated in the differential pressure molding container A1.

  The differential pressure molding container A1 has a sheet 1. The sheet 1 is a structural member of the differential pressure forming container A1, and fulfills a function for accommodating the contents 3 in a sealed state. The sheet 1 of the present embodiment has a pair of main plate portions 11. The material of the sheet 1 is the same as the sheet material 1A described above.

  The pair of main plate portions 11 face each other in the z direction, and include a housing portion 111 and a flange portion 112. The accommodating part 111 is a part processed into a shape in which the sheet 1 partially bulges in the z direction. In the present embodiment, the accommodating portions 111 having the same shape and the same size are formed on both the pair of main plate portions 11, and the spaces defined by these accommodating portions 111 are the accommodating spaces 19 and the extraction portions 15. ing. In addition, the mutually different shape or magnitude | size of the accommodating part 111 of a pair of main board part 11 may be sufficient. Moreover, it is not limited to the structure by which the bulging-shaped accommodating part 111 was formed in each of a pair of main board part 11. FIG. For example, the accommodating part 111 may be formed in one main plate part 11, and the other main plate part 11 may remain flat. Even in such a configuration, the accommodation space 19 and the extraction portion 15 can be configured. The flange portion 112 is a flat portion surrounding the accommodating portion 111. The shape of the flange portion 112 is not particularly limited, and in the illustrated example, the outer edge of the flange portion 112 when viewed in the z direction is substantially rectangular. In the present embodiment, the sheet 1 includes a base material layer 101 and a sealant layer 102. The sealant layer 102 appears on the inner surface of the accommodating portion 111 and defines the accommodating space 19.

  A seal portion 14 is formed on the sheet 1. The seal portion 14 is a portion where the sealant layers 102 of the flange portions 112 of the pair of main plate portions 11 are joined. The seal part 14 surrounds the accommodation space 19 (accommodation part 111) when viewed in the z direction. In the seal portion 14, the product name and components of the contents 3, or notes may be described. The joining means for forming the seal portion 14 is not particularly limited, and when the sheet 1 is made of a resin material, for example, heat sealing is used. In FIG. 9, for convenience of understanding, the seal portion 14 is hatched with a plurality of discrete points.

  The pouring part 15 is constituted by a part of the accommodating part 111 of the pair of main plate parts 11 and is for pouring the contents 3. In addition, the extraction | pouring part 15 is not limited to the example shown in figure, The shape, a magnitude | size, and a position are not limited at all. For example, the structure which has the some extraction part 15 may be sufficient. In this case, a plurality of planned cutting lines 13 that cross the plurality of extraction portions 15 may be provided. Moreover, it is not limited to the structure which provides the pouring part 15 separately from the filling port 16, The structure which this part serves as the pouring part 15 by leaving the filling port 16 partially may be sufficient. In this case, the planned cutting line 13 may be formed so as to cross the filling port 16.

  Each of the pair of main plate portions 11 is formed with a planned cutting line 13. As shown in FIG. 11, the planned cutting line 13 is constituted by the triangular groove 17A described above. For this reason, the planned cutting line 13 has a pair of inner side surfaces 171. The planned cutting line 13 is formed in the base material layer 101 and does not penetrate the base material layer 101. For this reason, the base material layer 101 remains between the deepest portion of the planned cutting line 13 and the barrier layer 103. In the illustrated example, all of the inner surface 171 of the planned cutting line 13 is configured by the surface layer 1012, but as described above, the deepest portion of the inner surface 171 may be configured by the main layer 1011. The planned cutting line 13 is a linear part that is easily cut with respect to the surrounding part, and is a part that becomes an opening start point of the differential pressure molded container A1 (container package B1) by cutting the sheet 1. The planned cutting line 13 crosses the extraction part 15, and in the illustrated example, crosses the main plate part 11 in the x direction.

  The folded portion 12 is a portion that is folded along the scheduled folding line 120 formed by the triangular groove 17B. As shown in FIG. 12, in the folded portion 12, the planned folding line 120 formed on the base material layer 101 is a widely opened portion.

  The contents 3 are stored in the storage space 19 in a sealed state. Examples of the contents 3 include pharmaceuticals, cosmetics, foods and the like, but are not particularly limited. Moreover, although it is preferable on the convenience of a user that the quantity of the content 3 accommodated in the accommodation space 19 shall be the quantity provided for one use, it is not limited to this.

  The contents 3 are poured out from the differential pressure molded container A1 through the pouring part 15 from the accommodation space 19 by opening the container package B1. The container package B1 is opened by cutting the pair of main plate portions 11 along the planned cutting line 13. By this cutting, the extraction portion 15 is in an open state. Thereby, the contents 3 are poured out from the opened extraction part 15.

  Here, Table 1 shows an example of the condition of the pressing roller 6A and an example of forming the triangular groove 17A and the planned cutting line 13. In these examples, the thickness of the main layer 1011 is 350 μm, the thickness of the surface layer 1012 is 40 μm, the thickness of the sealant layer 102 is 30 μm, the thickness of the barrier layer 103 is 10 μm, and the thickness of the auxiliary layer 104 is 20 μm. The sheet material 1A having a total thickness of 450 μm was used. The conveying speed of the sheet material 1A, that is, the relative speed between the pair of pressing rollers 6A and 6B and the sheet material 1A is 20 m / min. The height H is the height of the triangular convex portion 62. The depth D0 is the depth of 17A (scheduled cutting line 13) of the sheet material 1A, and the depth D1 is the depth of the cutting planned line 13 in the differential pressure molded container A1 (container package B1).

  Next, operation of the sheet material 1A, the differential pressure forming container A1, and the sheet material 1A manufacturing method will be described.

  According to this embodiment, as shown in FIGS. 1 and 5, triangular grooves 17 </ b> A and 17 </ b> B are formed in the sheet material 1 </ b> A. The triangular grooves 17 </ b> A and 17 </ b> B are linear concave portions formed on the base material layer 101 side in which the angle β formed by the pair of inner side surfaces 171 is 30 ° to 90 °. Such triangular grooves 17A and 17B are formed by pressing the triangular convex portions 62 of the pressing rollers 6A and 6B against the sheet material 1A, as shown in FIGS. For this reason, when forming the triangular grooves 17A and 17B, it is possible to avoid generation of chips and the like. Further, making the pressing rollers 6A and 6B pressed uniformly is easier to achieve than making the cutting depth uniform in a method of cutting the sheet material with a cutting blade, for example. For this reason, the depth of the triangular grooves 17A and 17B can be further stabilized. Further, the planned cutting line 13 formed by the triangular groove 17A is compared with the planned cutting line formed by cutting with a cutting blade, for example, when the container package is displayed at the storefront, etc. There is little possibility that 13 will be cut | disconnected unintentionally. Therefore, according to this embodiment, more stable cutting can be performed.

  According to the inventor's research, the angle β has a strong correlation with the angle α formed by the pair of outer side surfaces 621 of the triangular convex portion 62, and the angles are substantially the same. In order to set the angle β to 30 ° to 90 °, the angle α is set to 30 ° to 90 °. If the angle α is less than 30 °, a phenomenon that the triangular convex portion 62 clearly cuts the sheet material 1A occurs, and there is a concern that chips may be generated or the shape of the triangular groove is not maintained. On the other hand, when the angle α exceeds 90 °, it is difficult to form a triangular groove in the sheet material 1A by pressing the triangular convex portion 62. By setting the angle α to 30 ° to 90 °, the triangular groove 17A and the triangular groove 17B can be appropriately formed in the sheet material 1A. Further, according to the inventors' research, the triangular grooves 17A and 17B can be formed more stably if the angle β is 40 ° to 60 ° and the angle α is 40 ° to 60 °. is there.

  A circumferential surface 61 is formed on the pressing rollers 6A and 6B. As shown in FIGS. 3 and 4, when the pressing rollers 6A and 6B are pressed against the sheet material 1A, the peripheral surface 61 comes into contact with the sheet material 1A, and the triangular protrusions 62 of the pressing rollers 6A and 6B bite into the sheet material 1A. The depth can be stabilized. This is preferable for suppressing variation in the depth of the triangular grooves 17A and 17B. The sheet material 1 </ b> A has a sealant layer 102 on the opposite side of the base material layer 101. The sealant layer 102 is generally made of a softer resin material than the base material layer 101. When the pressing rollers 6 </ b> A and 6 </ b> B are pressed against the sheet material 1 </ b> A, the sealant layer 102 comes into contact with the support surface 51 of the support portion 5. Thus, when the pressing rollers 6A and 6B are pressed against the sheet material 1A, the sealant layer 102 serves as a cushion, and the pressing of the pressing rollers 6A and 6B is further stabilized, and the base material layer 101 is unduly crushed. Can be avoided.

  Further, the triangular grooves 17 </ b> A and 17 </ b> B have a depth smaller than the thickness of the base material layer 101 and do not penetrate the base material layer 101. For this reason, in this embodiment, it is possible to avoid accidentally cutting the barrier layer 103 in the formation of the triangular grooves 17A and 17B. Thereby, the gas barrier property and light-shielding property of the sheet material 1A can be maintained. Further, unlike the present embodiment, it is possible to prevent at least the sealant layer 102 from being cut even in a configuration without the barrier layer 103 and the auxiliary layer 104. The sealant layer 102 is generally made of a softer resin material than the base material layer 101. For this reason, even if, for example, an unintended force acts on the planned cutting line 13 when the differential pressure molded container A1 (container package B1) is displayed, the sealant layer 102 expands even if the base material layer 101 is torn. By doing so, it is possible to prevent the planned cutting line 13 from being completely cut.

  FIG. 13 is a cross-sectional photograph showing an example of the sheet material 1A shown in FIG. As shown in these drawings, the base material layer 101 of the sheet material 1 </ b> A includes a main layer 1011 and a surface layer 1012. The surface layer 1012 is made of an unstretched film and easily stretches. For this reason, when the pressing rollers 6A and 6B are pressed against the sheet material 1A, the surface layer 1012 extends along the outer side surface 621 of the triangular convex portion 62, and constitutes the inner side surface 171 of the triangular grooves 17A and 17B. Thereby, for example, the main layer 1011 can be prevented from being unintentionally cut at the deepest portion of the triangular grooves 17A and 17B. From this point of view, as shown in FIGS. 5 and 13, it is preferable that the inner surface 171 is entirely constituted by the surface layer 1012.

  FIG. 14 is a cross-sectional photograph showing a sheet material of a comparative example. Unlike the present invention, the sheet material is partially cut in the thickness direction by a cutting blade to form a partial cut portion 17 ′. The partial cutting portion 17 ′ is a linear portion constituting a planned cutting line, like the triangular groove 17 </ b> A. As clearly shown in the figure, the sheet material of this comparative example has a base material layer 101 including a main layer 1011 and a surface layer 1012. The partial cut portion 17 ′ penetrates the surface layer 1012 and reaches the lower portion of the main layer 1011. Such a partial cut portion 17 ′ does not penetrate all of the main layer 1011, but the deepest portion has a particularly sharp wedge shape and is likely to be the starting point of unintended cutting. Further, the surface layer 1012 remains in the vicinity of the surface of the base material layer 101, and is hardly extended to the inside of the partially cut portion 17 ', that is, the depth at which the main layer 1011 exists. In such a partially cut portion 17 ′, an effect of preventing unintended cutting by the surface layer 1012 cannot be expected. Unlike such a comparative example, the sheet material 1A of the present embodiment provided with the triangular grooves 17A and 17B is preferable for preventing unintentional cutting.

  Furthermore, when the differential pressure-molded container formed of the sheet material of the comparative example shown in FIG. 14 is cut, the cut portion has an angle close to a right angle, and the end surface of the surface layer 1012 is exposed near the surface of the sheet. This portion is a portion cut by the cutting blade, and tends to be in a shape that rises up, which causes a decrease in tactile sensation and the like. In this regard, the boundary between the surface of the sheet 1 and the inner side surface 131 is a right angle at the cutting position after the sheet 1 is cut along the planned cutting line 13 of the differential pressure molded container A1 (container package B1) of the present embodiment. The obtuse angle is larger than the angle, and the inner surface 131 is covered with the surface layer 1012. This location is not a cut location in the present embodiment, but a location formed by being pressed by the triangular convex portion 62. Therefore, the vicinity of the surface of the cut portion is likely to have a smooth shape, and it can be prevented that the cut portion stands up and can be avoided. In addition, being covered with the surface layer 1012 is advantageous for enhancing such an effect.

  The portion of the main layer 1011 located at the deepest portion of the triangular grooves 17A and 17B is a portion whose thickness is reduced by compression rather than cutting, and a strong pressing force is applied by the triangular convex portion 62. Thereby, although the said part is thinner than the thickness of main layer 1011 other than triangular groove 17A, 17B, it is anticipated that the intensity | strength is raised by the hardening effect | action by compression. This is preferable, for example, for preventing the intended cutting line 13 from being unintentionally cut in the differential pressure molded container A1 (container package B1).

  In the present embodiment, in addition to using the triangular groove 17A as the planned cutting line 13, the triangular groove 17B is used as the planned folding line 120 at the place where the sheet material 1A is folded. By forming such a linear recess, the sheet material 1A can be more reliably and stably folded at a desired position. Thus, the triangular groove obtained by pressing the triangular convex part 62 has an advantage not only as a planned cutting line but also as a planned folding line. Furthermore, in this embodiment, a pair of triangular grooves 17A and 17B are collectively formed by using a pair of pressing rollers 6A and 6B. The pair of triangular grooves 17A are used as a pair of planned cutting lines 13, and the triangular groove 17B located between the pair of triangular grooves 17A is used as a planned folding line 120. The distance between each of the pair of triangular grooves 17A and the triangular grooves 17B is the same. For this reason, as shown in FIG. 6A, when the sheet material 1A is folded along the planned folding line 120, the positions of the pair of planned cutting lines 13 can be more reliably matched in the z-direction view. . This is suitable for more easily and reliably performing the cutting along the pair of planned cutting lines 13 when opening the differential pressure molded container A1 (container package B1).

  The sheet material, differential pressure forming container, and sheet material manufacturing method according to the present invention are not limited to the above-described embodiments. The specific configuration of the sheet material, differential pressure forming container, and sheet material manufacturing method according to the present invention can be varied in design in various ways.

  The differential pressure molded container (container package) in which the sheet material of the present invention is used is not limited to the above-described differential pressure molded container A1 (container package B1), and bulges by applying differential pressure to the sheet material. The specific type is not particularly limited as long as it is a container manufactured by differential pressure forming to form a sheet having a portion. For example, a differential pressure molding container (container) in which a bulging portion similar to the accommodating portion 111 is formed by differential pressure molding, the contents are accommodated in the bulging portion, and then the bulging portion is sealed with a film or the like. Package).

A1: Differential pressure forming container B1: Container package 1: Sheet 1A: Sheet material 3: Contents 5: Support section 6A, 6B: Press roller 10A: Sheet roll 11: Main plate section 12: Folded section 13: Planned cutting line 14 : Sealing part 15: Extracting part 16: Filling ports 17A and 17B: Triangular groove 19: Accommodating space 51: Support surface 61: Peripheral surface 62: Triangular convex part 63: Shafts 72 and 74: Seal mold 73: Nozzle 101: Base material layer 102: Sealant layer 103: Barrier layer 104: Auxiliary layer 111: Housing part 112: Flange part 120: Folded line 161: Filling mark 171: Inner side 621: Outer side 1011: Main layer 1012: Surface layer H: Height α, β: Angle

Claims (8)

A long sheet material used for a differential pressure forming container sheet,
A first resin layer and a second resin layer having a lower tensile elastic modulus than the first resin layer,
In the first resin layer, a sheet material is characterized in that a triangular groove having an angle formed by a pair of inner side surfaces of 30 ° to 90 ° is formed so as not to contact the second resin layer.   The sheet material according to claim 1, wherein the first resin layer includes a main layer and a surface layer made of an unstretched film provided on the opposite side of the second resin layer with respect to the main layer.   The sheet material according to claim 2, wherein the pair of inner side surfaces are constituted by the surface layer.   The sheet material according to any one of claims 1 to 3, further comprising a barrier layer interposed between the first resin layer and the second resin layer.   The sheet material according to any one of claims 1 to 4, wherein an angle formed by the pair of inner side surfaces is 40 ° to 60 °. A differential pressure molded container formed by a differential pressure molded container sheet using the sheet material according to any one of claims 1 to 5,
The differential pressure molded container, wherein the triangular groove constitutes a cutting line. A method for producing a sheet material according to any one of claims 1 to 5,
A triangular projection having a triangular cross section that supports a sheet material having the first resin layer and the second resin layer by a support portion from the second resin layer side, extends in the circumferential direction, and protrudes radially outward. A method for producing a sheet material, comprising: a groove forming step of forming a triangular groove in the first resin layer by pressing a pressing roller having a portion from the first resin layer side. The pressing roller has a circumferential surface perpendicular to the radial direction and along the circumferential direction,
The method for manufacturing a sheet material according to claim 7, wherein the triangular protrusion protrudes from the peripheral surface.