JP2018167857A - Container and method for producing the container - Google Patents

Abstract

To provide a container having tearability and filling suitability.SOLUTION: A container includes: a main body part which has a body part defining a storage part and a flange part spread from the upper part of the body part to the outside and is formed from a first laminate; a lid part which is joined to the flange part of the main body part through an outer edge seal part so as to cover the storage part and is formed of a second laminate; a steam discharge mechanism which is structured to make the storage part communicate with the outside of the container when a pressure of the storage part is increased; and opening means formed on the lid part and the flange part. Tear strengths of the main body part and the lid part are 15 N or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a container including a main body portion having a trunk portion and a flange portion, and a lid portion joined to the flange portion, and a method for manufacturing the same.

  As a container for storing contents such as cooked food, for example, as disclosed in Patent Document 1, a deep-drawn container obtained by deep-drawing a laminate is known. The deep-drawing container includes a main body having a trunk formed by deep drawing and a flange extending outward from the upper portion of the trunk, and a lid joined to the flange. Further, the container is provided with a steam release mechanism for discharging water vapor generated when the contents are heated by a microwave oven or the like to the outside.

  As another type of container, as disclosed in Patent Document 2, for example, a container obtained by joining two laminated bodies, also called pouches, along an outer edge is known.

JP 2006-232280 A JP 2013-151317 A

  In the deep-drawn container, the laminate is required to be easily stretched from the viewpoint of formability when producing a body portion having a large depth. On the other hand, the ease of elongation of the laminate and the ease of tearing of the laminate are in a trade-off relationship. This is because, when trying to tear a laminate that is easily stretched, the force applied to the laminate mainly acts as a force that stretches the laminate, and does not easily act as a force that breaks the laminate. For this reason, in a deep-drawn container, it is difficult to adopt a method of tearing the container as a method for opening the container. Therefore, conventionally, as a method for opening the container, there is a method in which the lid part is peeled off from the flange part. It has been adopted. In this case, a layer for joining the lid portion to the flange portion, for example, a thermoplastic resin layer, is required to have a property of being easily peeled off by applying force, so-called easy peel property. However, the thermoplastic resin layer having easy peel properties is expensive, and the manufacturing cost of the container is increased.

  In a pouch-type container, the contents are filled from an opening at the upper edge of the pouch after the outer edges other than the upper edge of the two laminates are joined to form the pouch. For this reason, in the case of a pouch-type container, compared to a container of a type in which a body portion filled with contents is sealed with a lid, such as a deep-drawn container, an opening portion through which the contents to be filled passes is provided. Narrow dimensions and poor filling of contents.

  An object of this invention is to provide the container which can solve these subjects effectively, and its manufacturing method.

  The present invention is a container having a storage portion for storing contents, a body portion having a barrel portion defining the storage portion, and a flange portion extending outward from the upper portion of the barrel portion, A main body part constituted by one laminated body and a lid part joined to the flange part of the main body part via an outer edge seal part so as to cover the accommodating part, and the lid part constituted by the second laminated body And a steam release mechanism configured to communicate the storage portion with the outside of the container when the pressure of the storage portion increases, and an opening means formed on the lid portion and the flange portion, It is a container whose tear strength of a main-body part and the said cover part is 15 N or less.

  In the container according to the present invention, the flange portion includes a first edge portion and a second edge portion extending in parallel to each other in the first direction, and the opening means tears the main body portion and the lid portion in the first direction. It may be configured to facilitate.

  In the container according to the present invention, the opening means is configured to easily tear the flange portion extending along the first edge portion at a position inside the outer edge seal portion extending along the first edge portion. It may be.

  The container by this invention WHEREIN: The said 1st laminated body is a 1st base material containing the thermoplastic resin layer which comprises the inner surface located in the said accommodating part side, and the extending | stretching film extended | stretched along the said 1st direction, It may have at least.

  In the container according to the present invention, the unsealing means may include at least a notch or a scar group formed in the flange portion.

  In the container according to the present invention, a bonding strength between the flange portion and the lid portion may be 23N or more.

  In the container according to the present invention, the body portion may have a depth of 5 mm or more and 20 mm or less.

  In the container according to the present invention, the thickness of the first laminate may be 150 μm or less.

  The present invention is a method for manufacturing a container having a container for storing contents, and having a steam escape mechanism configured to communicate the container with the outside when the pressure of the container increases. Preparing a first laminated body for constituting a main body having a body part defining a housing part and a flange part extending outward from the upper part of the body part; and drawing the first laminated body. Performing the step of forming the body part, filling the body part with contents, and superimposing a second laminated body for constituting a lid part covering the accommodating part on the first laminated body, Joining the second laminate to a flange portion extending outward from the upper portion of the body portion of the first laminate, wherein the flange portion is formed with an opening means, and the drawing is performed. The temperature of the first laminate is the thermoplastic resin layer of the first laminate. It is carried out at a temperature lower than the melting point, a method for producing a container.

  In the method for manufacturing a container according to the present invention, the tear strength of the main body and the lid is preferably 15 N or less.

  In the container manufacturing method according to the present invention, the flange portion includes a first edge portion and a second edge portion extending in parallel to each other in the first direction, and the opening means includes the body portion and the lid in the first direction. You may be comprised so that a part may be torn easily.

  According to the present invention, it is possible to provide a container having tearability and filling ability.

It is a top view which shows the container in embodiment of this invention. It is sectional drawing which shows the case where the container shown in FIG. 1 is seen along II-II line. It is sectional drawing which shows an example of the layer structure of the laminated body which comprises a main-body part and a cover part. It is sectional drawing which shows the other example of the layer structure of the laminated body which comprises a main-body part and a cover part. It is sectional drawing which shows the other example of the layer structure of the laminated body which comprises a main-body part and a cover part. It is a figure for demonstrating the measuring method of tear strength. It is a figure for demonstrating the measuring method of tear strength. It is a figure for demonstrating the measuring method of joining strength. It is a figure for demonstrating the measuring method of joining strength. It is a figure for demonstrating the measuring method of joining strength. It is a figure which shows the manufacturing process of a container. It is a figure which shows the manufacturing process of a container. It is a figure which shows the manufacturing process of a container. It is a figure which shows a mode that the accommodating part of a container communicates outside. It is a figure which shows a mode that a container is torn. It is a top view which shows one modification of a container. It is a top view which shows one modification of a container.

  An embodiment of the present invention will be described with reference to FIGS. Note that, in the drawings attached to the present specification, for convenience of illustration and understanding, the scale and vertical / horizontal dimension ratios are appropriately changed and exaggerated from those of the actual ones.

  In addition, as used in this specification, the shape and geometric conditions and the degree thereof are specified, for example, terms such as “parallel”, “orthogonal”, “identical”, length and angle values, etc. are strictly Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

  FIG. 1 is a plan view showing a container 1 according to the present embodiment. Moreover, FIG. 2 is sectional drawing which shows the case where the container 1 shown in FIG. 1 is seen along a II-II line. The container 1 includes a main body portion 10 in which a storage portion 101 for storing contents is formed, and a lid portion 20 joined to the main body portion 10 so as to cover the storage portion 101. In addition, the container 1 further includes a steam release mechanism 30 that discharges the steam generated in the storage unit 101 when the contents are heated to the outside of the storage unit 101. The container 1 further includes an opening means 27 for facilitating the opening of the container 1 by tearing.

  In the present specification, “joining” is a concept including both welding and adhesion. “Welding” means attaching the lid 20 to the main body 10 by at least partially melting at least one of the main body 10 or the lid 20. “Adhesion” means that the lid 20 is attached to the main body 10 using components such as an adhesive that are separate from the main body 10 and the lid 20.

  The contents accommodated in the main body 10 include at least water. Examples of contents include retort food, frozen food, refrigerated food, and the like. Further, the contents may contain relatively little moisture such as fish fillets and dried fish.

  Hereinafter, the main body 10, the lid 20, the steam escape mechanism 30, and the opening means 27 will be described.

〔container〕
As shown in FIGS. 1 and 2, the main body portion 10 includes a trunk portion 11 that defines the accommodating portion 101, and a flange portion 12 that spreads outward from the upper portion of the trunk portion 11. The trunk | drum 11 contains the bottom face 111 and the side surface 112 standingly arranged from the bottom face 111 so that it may spread over a periphery along the outer edge of the bottom face 111, for example. Further, the flange portion 12 is connected to the upper portion of the body portion 11 over the entire circumference. The lid portion 20 is disposed on the upper surface of the flange portion 12. Although not shown, when the rigidity of the main body 10 is low, the body 11 and the flange 12 may be partially curved.

  In the present specification, terms such as “bottom surface”, “side surface”, and “upper portion” refer to a state in which the container 1 is placed so that the housing portion 101 of the main body portion 10 opens upward. 1, the position and direction of the main-body part 10, the cover part 20, and those components are represented. The “outside” is a side away from the center of the housing portion 101 of the main body portion 10 in plan view. The “inside” is a side closer to the center of the housing portion 101 of the main body portion 10.

  In the present embodiment, the bottom surface 111 and the flange portion 12 have a rectangular outline. For example, the flange portion 12 includes a first edge portion 13 and a second edge portion 14 that face each other, and a third edge portion 15 and a fourth edge portion 16 that extend between the first edge portion 13 and the second edge portion 14. ,including. The first edge 13 and the second edge 14 extend in the first direction D1 in parallel with each other. Further, the third edge portion 15 and the fourth edge portion 16 extend in the second direction D2 intersecting the first direction D1 in parallel with each other. In the example shown in FIG. 1, the second direction D2 is orthogonal to the first direction D1. “Parallel” means that the angle formed by the direction in which one edge extends and the direction in which the other edge extends is 20 ° or less. In addition, “intersection” means that the angle formed by the direction in which one edge extends and the direction in which the other edge extends is greater than 20 °.

  The shape of the contour of the bottom surface 111 and the flange portion 12 is not particularly limited to the shape of FIG. For example, although not shown, the corner portion of the flange portion may have an arc shape that is chamfered and protrudes outward. Further, the contour of the bottom surface 111 and the contour of the flange portion 12 may be similar or may not be similar.

  In FIG. 1, reference numeral S1 represents the dimension of the container 1 in the first direction D1, and reference numeral S2 represents the dimension of the container 1 in the second direction D2. In FIG. 2, the symbol H represents the depth of the body portion 11 of the main body portion 10. The depth H is, for example, 5 mm or more and 20 mm or less. Moreover, both H / S1 and H / S2 are 0.2 or less. Thus, in the present embodiment, the degree of forming when forming the body 11 by forming the laminate is relatively small. For this reason, the thing which is hard to extend | stretch as a laminated body which comprises the main-body part 10 is employable. For example, as will be described later, a laminated body including a stretched film can be used as the first laminated body constituting the main body 10.

[Cover]
The lid portion 20 is disposed on the flange portion 12 so as to cover the housing portion 101 of the main body portion 10, and is joined to the upper surface of the flange portion 12 via the outer edge seal portion 25. In addition, the flange part 12 does not need to be joined to the cover part 20 over the whole area, and the non-seal part 26 in which the flange part 12 is not joined to the cover part 20 may exist. In the example shown in FIG. 2, in the flange portion 12 extending along the first edge portion 13, the portion on the third edge portion 15 side is located on the inner side of the outer edge seal portion 25 extending along the first edge portion 13. There is a non-seal portion 26 extending along the first direction D1 from the outer edge seal portion 25 to the outer edge seal portion 25 on the fourth edge portion 16 side. The opening means 27 described later is configured to open the container 1 along the non-sealing portion 26.

  As shown in FIGS. 1 and 2, the lid portion 20 includes a first lid portion 21 located on the first edge portion 13 side and a second lid portion 22 located on the second edge portion 14 side. May be. The end portion of the first lid portion 21 and the end portion of the second lid portion 22 overlap each other and are joined to each other by the palm seal portion 32. A portion where the first lid portion 21 and the second lid portion 22 overlap is also referred to as a palm portion 31. The palm portion 31 and the palm seal portion 32 extend in the first direction D1. Further, the palm portion 31 is closer to the first edge portion 13 than the second edge portion 14 of the flange portion 12. As will be described later, the first direction D1 in which the palm portion 31 extends is the transport direction T in which the first stacked body and the second stacked body for forming the main body 10 and the lid 20 are transported in the manufacturing process of the container 1. Is parallel to the direction.

[Vapor escape mechanism]
The steam release mechanism 30 is a mechanism configured to communicate the storage unit 101 with the outside of the container 1 when the pressure of the storage unit 101 increases. In the present embodiment, the steam escape mechanism 30 includes a through-hole 33 formed in the palm seal portion 32. The through hole 33 passes through at least one of the first lid portion 21 and the second lid portion 22. In the example shown in FIG. 2, the through hole 33 passes through the second lid portion 22. As will be described later, when the pressure of the accommodating portion 101 increases and the separation of the palm seal portion 32 proceeds and the separation reaches the through hole 33, the vapor of the accommodating portion 101 may escape to the outside through the through hole 33. it can. In the example shown in FIG. 2, the through hole 33 is located at the center of the palm seal portion 32 extending in the first direction D1. Although not shown, the through hole 33 may be located at a location shifted from the center portion of the palm seal portion 32. As shown in FIG. 1, the through-hole 33 may have a V-shape, for example, which is convex toward the housing portion 101.

[Opening means]
The opening means 27 is configured to easily tear the main body 10 and the lid 20 in the first direction D1 in which the first edge 13 extends. For example, the opening means 27 includes a notch 28 formed in the main body portion 10 and the lid portion 20 at a position close to the first edge portion 13 in the third edge portion 15. The notch 28 may be a notch or a notch. The user can tear the main body 10 and the lid 20 in the first direction D1 with the notch 28 as a starting point.

  As shown in FIG. 1, the opening means 27 is configured to easily tear the flange portion 12 extending along the first edge portion 13 at a position inside the outer edge seal portion 25 extending along the first edge portion 13. Has been. For example, the notch 28 of the opening means 27 is disposed so as to overlap with the non-seal portion 26 of the flange portion 12 extending along the first edge 13 when the notch 28 is viewed along the first direction D1. . In this case, when the user tears the main body portion 10 and the lid portion 20 in the first direction D1 starting from the notch 28, the tear line passes through the non-seal portion 26 of the flange portion 12. In the non-seal part 26 of the flange part 12, the flange part 12 and the lid part 20 are not joined but are close to each other. For this reason, compared with the case where the main-body part 10 and the cover part 20 are torn in the position of the trunk | drum 11, tearability can be improved.

  Although not shown, the opening means 27 may be configured to tear the main body 10 and the lid 20 at the position of the body 11. Even in this case, in the present embodiment, as will be described later, since the first laminated body 41 constituting the main body portion 10 has tearability, the container 1 can be opened by tearing.

(First laminate)
Next, with reference to FIG. 3, the layer structure of the 1st laminated body 41 which comprises the main-body part 10 is demonstrated. The first laminate 41 includes at least a first base material 43 and a thermoplastic resin layer 45. FIG. 3 shows an example in which the first laminate 41 includes a first base material 43, a printing layer 44, and a thermoplastic resin layer 45. The first base material 43 constitutes the outer surface 41 y of the first stacked body 41. The thermoplastic resin layer 45 constitutes the inner surface 41 x of the first laminate 41. The print layer 44 can be provided between the first base material 43 and the thermoplastic resin layer 45, and can be provided on the surface on the inner surface 41 x side of the first base material 43. The inner surface 41x is a surface located on the housing portion 101 side in the main body 10, and the outer surface 41y is a surface located on the opposite side of the inner surface 41x.

  The first base material 43 has a certain rigidity so as to prevent the main body 10 from extending when the container 1 is opened. For example, the first substrate 43 includes a stretched film that is at least uniaxially stretched, preferably biaxially stretched. As a material constituting the stretched film, for example, polyamide such as nylon (ONy) or polyester such as polyethylene terephthalate (PET) can be used. The stretched film included in the first base material 43 is preferably stretched along the first direction D1. For example, the angle formed by the stretch direction of the stretched film contained in the first base material 43 and the first direction D1 is preferably 45 degrees or less, more preferably 30 degrees or less, and 20 degrees or less. More preferably it is.

The thickness of the stretched film of the first base material 43 is appropriately set according to the material used. For example, when nylon is used as the material constituting the stretched film of the first base material 43, the thickness of the stretched film of the first base material 43 is not less than 9 μm and not more than 50 μm, preferably not less than 12 μm and not more than 25 μm. A stretched film refers to a film having a tensile elongation of less than 300%, preferably 200% or less, as measured according to JIS K 7127. Specific examples of the nylon film constituting the first substrate 43 are shown in Table 1 together with the thickness and characteristics of each film. In addition, Table 2 shows an example of a PET film constituting the first base material 43.

  The printed layer 44 of the first laminated body 41 is a layer printed on the first base material 43 in order to show product information or impart aesthetics to the main body unit 10. The print layer 44 expresses characters, numbers, symbols, figures, patterns, and the like. As a material constituting the printing layer 44, an ink for gravure printing or an ink for flexographic printing can be used.

  The ink constituting the printing layer 44 includes a binder and a pigment. The binder includes, for example, polyurethane. Polyurethane is a cured product produced by a reaction between a polyol as a main agent and an isocyanate compound as a curing agent.

  The thermoplastic resin layer 45 is a layer that forms a seal portion such as the outer edge seal portion 25 by melting. As a material constituting the thermoplastic resin layer 45, one or more resins selected from polyethylene such as low density polyethylene and linear low density polyethylene, and polypropylene can be used. The thermoplastic resin layer 45 can be an unstretched film. An unstretched film refers to a film having a tensile elongation of 300% or more, preferably 400% or more as measured according to JIS K 7127. The thermoplastic resin layer 45 may be a single layer or a multilayer. The thermoplastic resin layer 45 preferably includes an unstretched film. The thickness of the thermoplastic resin layer 45 is, for example, 30 μm or more and 100 μm or less.

  An adhesive resin layer or an adhesive layer containing an adhesive may be provided between the first base material 43 provided with the print layer 44 and the thermoplastic resin layer 45. The adhesive resin layer includes low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polyethylene such as a copolymer with ethylene-α olefin polymerized using a metallocene catalyst, and ethylene-vinyl acetate. Copolymers, ethylene-acrylic acid copolymers, ethylene-ethyl acrylate copolymers, ethylene-methacrylic acid copolymers, ethylene-methyl methacrylate copolymers, ethylene-maleic acid copolymers, etc. One or more resins selected from saturated carboxylic acid copolymers and ionomer resins can be used in combination. An adhesive agent is produced | generated from the adhesive composition produced by mixing the 1st composition containing a main ingredient and a solvent, and the 2nd composition containing a hardening | curing agent and a solvent. Specifically, an adhesive contains the hardened | cured material produced | generated by the reaction of the main ingredient and solvent in an adhesive composition. Examples of the main agent include a polyol, examples of the curing agent include an isocyanate compound, and examples of the adhesive include an ether-based two-component reactive adhesive or an ester-based two-component reactive adhesive. it can. Examples of the ether-based two-component reactive adhesive include polyether polyurethane. The polyether polyurethane is a cured product produced by a reaction between a polyether polyol as a main agent and an isocyanate compound as a curing agent. Examples of the ester-based two-component reactive adhesive include polyester polyurethane and polyester. Polyester polyurethane is a cured product produced by a reaction between a polyester polyol as a main agent and an isocyanate compound as a curing agent. Moreover, you may use an acrylic polyol as a main ingredient.

(First Modification of First Laminate)
As shown in FIG. 4, the first stacked body 41 may further include a second base material 46 positioned between the first base material 43 and the thermoplastic resin layer 45. In the example shown in FIG. 4, the second base material 46 is located between the print layer 44 provided on the first base material 43 and the thermoplastic resin layer 45.

  Similarly to the first base material 43, the second base material 46 preferably includes a stretched film that is at least uniaxially stretched, preferably biaxially stretched. As a material constituting the stretched film, the same material as the first base material 43 can be used. Similarly to the stretched film of the first base material 43, the stretched film included in the second base material 46 is preferably stretched along the first direction D1. For example, the angle formed by the stretched direction of the stretched film contained in the second substrate 46 and the first direction D1 is preferably 45 degrees or less, more preferably 30 degrees or less, and 20 degrees or less. More preferably it is.

  In the example shown in FIG. 4, polyethylene terephthalate can be used as a material constituting the stretched film of the first base material 43. In this case, the thickness of the stretched film of the first substrate 43 is, for example, 9 μm or more and 50 μm or less, preferably 12 μm or more and 25 μm or less. Specific examples of the PET film constituting the first base material 43 are the same as those in the above-described example shown in FIG. 3 and Table 2.

  Between the first base material 43 and the second base material 46 provided with the printing layer 44 and between the second base material 46 and the thermoplastic resin layer 45, the above-described adhesive resin layer or adhesive is provided. An adhesive layer may be provided.

(Second modification of the first laminate)
As shown in FIG. 5, the first laminate 41 may further include an intermediate layer 47 located between the first base material 43 and the thermoplastic resin layer 45. In the example shown in FIG. 5, the intermediate layer 47 is located between the printed layer 44 provided on the first base material 43 and the thermoplastic resin layer 45.

  The intermediate layer 47 includes, for example, a gas barrier layer. As the gas barrier layer, for example, a vapor deposition layer of a metal oxide such as aluminum oxide or an inorganic oxide such as silicon oxide can be provided. In addition, a resin layer having a high gas barrier property such as an ethylene-vinyl alcohol copolymer (EVOH), a polyvinylidene chloride resin (PVDC), and an aliphatic polyamide such as nylon MXD6 may be provided as the gas barrier layer. . Thereby, it is possible to prevent oxygen and water vapor from entering the container 1. The thickness of the intermediate layer 47 is, for example, not less than 12 μm and not more than 25 μm.

(Second laminate)
The second stacked body 42 has the same layer configuration as the first stacked body 41. The second laminate 42 includes at least a first base material 43 and a thermoplastic resin layer 45. As shown in FIG. 3, the second laminate 42 includes a first base material 43 that forms the outer surface 42 y, a thermoplastic resin layer 45 that forms the inner surface 42 x, and a printing layer 44 that is provided on the first base material 43. And may have. In addition, as shown in FIG. 4, the second laminate 42 may further include a second substrate 46 positioned between the first substrate 43 and the thermoplastic resin layer 45. Further, as shown in FIG. 5, the second stacked body 42 may further include an intermediate layer 47 positioned between the first base material 43 and the thermoplastic resin layer 45. The layer configuration of the first stacked body 41 and the layer configuration of the second stacked body 42 may be the same or different.

  The configuration of the first base material 43, the printing layer 44, the thermoplastic resin layer 45, and the second base material 46 of the second laminated body 42 is the same as that of the first base material 43, the printing layer 44, and the thermoplastic resin of the first laminated body 41. The configurations of the layer 45 and the second substrate 46 are the same. For example, the first base material 43 of the second stacked body 42 may also include a stretched film stretched at least uniaxially, like the first base material 43 of the first stacked body 41. Thereby, when opening the container 1, it can suppress that the cover part 20 expands.

(Tearability)
Next, the tearability of the first stacked body 41 and the second stacked body 42 will be described. Here, tear strength is used as an index of tearability. A method for measuring the tear strength will be described with reference to FIGS. As a measuring instrument, for example, Tensilon Universal Material Testing Machine RTC-1310 manufactured by A & D can be used.

First, as shown in FIG. 6, a test piece 60 including a first stacked body 41 and a second stacked body 42 that are stacked on each other is prepared. The test piece 60 is obtained, for example, by cutting out a part of the main body 10 constituted by the first laminated body 41 and a part of the lid part 20 constituted by the second laminated body 42. In FIG. 1, a one-dot chain line frame denoted by reference symbol VI indicates an example of a part of the main body 10 and a part of the lid 20 that are cut out to create the test piece 60. In the example illustrated in FIG. 1, the test piece 60 includes a portion where the first stacked body 41 and the second stacked body 42 are joined by a seal portion such as the outer edge seal portion 25. A seal portion such as the outer edge seal portion 25 in the state of the container 1 becomes a seal portion 65 in the test piece 60 shown in FIG. Further, in the example shown in FIG. 1, the test piece 60 includes both a part constituting the body part 11 of the main body part 10 and a part constituting the flange part 12 in the first laminated body 41. Although not shown, the test piece 60 mainly includes a portion constituting the flange portion 12 of the main body portion 10 in the first laminated body 41 and includes all or almost a portion constituting the body portion 11 of the main body portion 10. It does not have to be.

  As shown in FIG. 6, the test piece 60 has a rectangular shape including a long side having a length L1 and a short side having a length L2. In FIG. 6, reference numerals 61 and 62 denote end portions in the long side direction (hereinafter also referred to as a first end portion and a second end portion). The seal portion 65 extends along the first end portion 61. Reference numerals 63 and 64 denote end portions in the direction of the short side (hereinafter also referred to as third end portion and fourth end portion). As shown in FIG. 1, the test piece 60 is cut out from the container 1 so that the direction of the long side of the test piece 60 coincides with the first direction D1.

  After preparing the test piece 60, as shown in FIG. 6, the notch 66 extended in the long side direction over the distance L3 is formed in the intermediate point of the 1st end part 61 in the short side direction. The cut 66 is formed so that the end point reaches a portion where the first stacked body 41 and the second stacked body 42 are not joined.

  Subsequently, as shown in FIG. 7, a portion of the first end 61 closer to the third end 63 than the notch 66 is gripped by the first gripper 71. Further, the second end 72 grips the portion of the first end 61 on the fourth end 64 side. Thereafter, the second gripper 72 is displaced toward the second end 62 in the long side direction of the test piece 60. Thereby, the test piece 60 is torn in the long side direction starting from the end point 67 of the notch 66. The speed at which the second gripper 72 is displaced relative to the first gripper 71 is 200 mm / min. At that time, the force [N] required to displace the second gripper 72 is measured.

  The displacement of the second gripper 72 is continued over a distance L4 in the long side direction. The maximum value of the force [N] necessary for displacing the second gripper 72 during the displacement of the second gripper 72 over the distance L4 is defined as the tear strength [N] of the test piece 60. The tear strength of the test piece 60 reflects the tearability of the first laminate 41 constituting the main body 10 and the tearability of the second laminate 42 constituting the lid 20.

  The distance L3 of the notch 66 is, for example, 30 mm. The short side length L2 is 25 mm. The distance L4 at which the test piece 60 is torn in the measurement is 50 mm. The long side length L1 is determined such that a predetermined distance L3 and a distance L4 can be secured. For example, the long side length L1 is 100 mm or more.

  In addition, when it is difficult to sufficiently secure the length L1 of the long side of the test piece 60, the distance L3 of the notch 66 may be smaller than 30 mm. Further, a member such as a tape may be provided on the first end portion 61 so that the first end portion 61 can be easily gripped by the first gripping tool 71 and the second gripping tool 72. Further, the seal portion 65 may not be present at the first end portion 61.

  The tear strength [N] of the test piece 60 including a part of the main body part 10 and a part of the lid part 20 according to the present embodiment is at least 15 N or less, more preferably 10 N or less. Thereby, it becomes easy to make the main-body part 10 comprised by the 1st laminated body 41, and the cover part 20 comprised by the 2nd laminated body 42 break by tearing. This makes it possible to open the container 1 by tearing the container 1.

(Joint strength)
As described above, the container 1 according to the present embodiment is configured such that the container 1 can be opened by tearing the main body 10 and the lid 20 using the opening means 27. For this reason, the easy peel property is not required for the first stacked body 41 and the second stacked body 42.

  Hereinafter, a method for measuring the bonding strength will be described. As a measuring device, a tensile tester RTC-1310A with a constant temperature bath manufactured by Orientec Co., Ltd. was used. Specifically, first, the first stacked body 41 and the second stacked body 42 were joined to each other to produce a rectangular test piece 80. The test piece 80 has a width (short side) of 15 mm. Moreover, in the test piece 80, as shown in FIG. 8, the 1st laminated body 41 and the 2nd laminated body 42 are peeled over 15 mm from one front-end | tip of the long side direction. Thereafter, as shown in FIG. 9, the already peeled portions of the first stacked body 41 and the second stacked body 42 are gripped by the first gripping tool 81 and the second gripping tool 82 of the measuring instrument, respectively. In addition, the gripping tools 81 and 82 are pulled at a speed of 300 mm / min in directions opposite to each other in the direction orthogonal to the surface direction of the portion where the first stacked body 41 and the second stacked body 42 are still joined. Then, the maximum value of the tensile stress (see FIG. 10) is measured. FIG. 10 is a diagram showing changes in tensile stress with respect to the interval K. FIG.

  For the five test pieces 80, the maximum value of the tensile stress is measured, and the average value is defined as the bonding strength between the first laminate 41 and the second laminate 42. The distance K between the gripping tools 81 and 82 when starting to pull is 20 mm, and the distance K between the gripping tools 81 and 82 when finishing pulling is 40 mm. The environment during measurement is a temperature of 25 ° C. and a relative humidity of 50%.

  The bonding strength at 15 mm width of the test piece 80 to which the first stacked body 41 and the second stacked body 42 according to the present embodiment are bonded may be, for example, 23N or more, or 40N or more. Thereby, compared with the case where the thermoplastic resin layer 45 of the 1st laminated body 41 and the 2nd laminated body 42 is comprised so that it may have an easy peel property, when an internal pressure increases by microwave oven cooking, the flange part 12 of FIG. Since peeling of the outer edge seal portion 25 (retraction of the seal toward the outer edge side of the flange portion 12) is less likely to occur, steam can be reliably released from a predetermined steaming opening such as the through hole 33. Moreover, the cost of the thermoplastic resin layer 45 can be reduced. Note that the bonding strength may be less than 23N.

Method for producing a container Next, a method of manufacturing a container 1 with a first laminate 41 and second laminate 42 described above will be described with reference to FIGS.

  First, the first stacked body 41 is prepared and transported in the transport direction T. Subsequently, as shown in FIG. 11, the first laminated body 41 is drawn. For example, the male mold 91 is disposed on the inner surface 41x side, and the female mold 92 is disposed on the outer surface 41y side. Then, the male mold 91 is relatively moved toward the female mold 92, and the first stacked body 41 is pushed into the recess of the female mold 92. Thereby, as shown in FIG. 11, the body portion 11 can be formed in the first stacked body 41. At this time, the first laminated body 41 may be fixed using a pressing plate 93 in order to prevent the first laminated body 41 from being stretched at a portion other than the body portion 11.

In the step of drawing the first laminated body 41, the space on the side where the female mold 92 is located, that is, the space on the outer surface 41y side of the first laminated body 41, is in a vacuum state having a pressure lower than the atmospheric pressure. Good. Thereby, the outer surface 41y of the first laminated body 41 can be brought into close contact with the female die 92, and the first laminated body 41 can be accurately molded. In the vacuum state, the pressure is preferably 0.05 atm (0.05 × 10 ⁵ Pa) or more and 0.3 atm (0.3 × 10 ⁵ Pa) or less. The space on the side where the male mold 91 is located, that is, the space on the inner surface 41x side of the first stacked body 41 may be in a compressed air state having a pressure higher than the atmospheric pressure. Also by this, the outer surface 41y of the 1st laminated body 41 can be contact | adhered to the female die 92, and the 1st laminated body 41 can be shape | molded accurately. In the compressed air state, the pressure is preferably 1.5 atm (1.5 × 10 ⁵ Pa) or more and ⁵ atm (5.0 × 10 ⁵ Pa) or less.

  In the present embodiment, the above-described drawing is performed at a temperature lower than the melting point of, for example, the thermoplastic resin layer 45 of the first laminated body 41 or the glass transition temperature of the first base material 43. The lower temperature is less than 120 ° C., preferably 60 ° C. or more and 100 ° C. or less, or at room temperature. Here, in the present embodiment, as described above, the depth of the body portion 11 is relatively small, and therefore, the degree of expansion of the first laminated body 41 at the time of drawing is also small. Therefore, desired drawing can be applied to the first laminate 41 even at a temperature lower than the melting point of the thermoplastic resin layer 45 or a temperature lower than the glass transition temperature of the first base material 43.

  You may implement both adjustment of the above-mentioned pressure, and adjustment of the temperature of the 1st laminated body 41. FIG. For example, in a state where the first laminated body 41 is heated to 60 ° C. or more and 100 ° C. or less, for example, about 80 ° C., the atmosphere of the space on the female die 92 side or the atmosphere of the space on the male die 91 side is set in a vacuum state, The first laminated body 41 may be in close contact with the female die 92 or the male die 91. In this case, the first laminated body 41 can be formed using only the female mold 92 or the male mold 91. Alternatively, the atmosphere of the space on the opposite side to the female die 92 in the first laminated body 41 may be in a compressed air state so that the first laminated body 41 is in close contact with the female die 92. Also in this case, the first laminated body 41 can be formed with only the female die 92.

Specific examples of combinations of molds, temperatures and pressures used when the first laminated body 41 is drawn will be described below.
[Example 1]
・ Type: male mold 91 and female mold 92
The temperature of the first laminated body 41: 20 ° C. or more and 100 ° C. or less The pressure in the space on the male mold 91 side: Above atmospheric pressure and 5 atm or less The pressure in the space on the female mold 92 side: 0.05 atm or more and 0.3 atm [Example 2]
・ Type: Female type 92
-Temperature of the first laminated body 41: 60 ° C or higher and 100 ° C or lower-Pressure in the space on the female mold 92 side: 0.05 atm or higher and 0.3 atm or lower-Opposite to the female mold 92 across the first laminated body 41 Side pressure: above atmospheric pressure and below 5 atm [Example 3]
・ Type: Female type 92
The temperature of the first laminate 41: 60 ° C. or more and 100 ° C. or less The pressure in the space on the female die 92 side: atmospheric pressure The pressure on the opposite side of the female die 92 across the first laminate 41: 1.5 atm Above and below 5 atm [Example 4]
・ Type: Male 91
-Temperature of the first laminated body 41: 60 ° C or higher and 100 ° C or lower-Pressure in the space on the male mold 91 side: 0.05 atm or higher and 0.3 atm or lower-Opposite to the male mold 91 across the first laminated body 41 Side pressure: above atmospheric pressure and below 5 atm

  Subsequently, as shown in FIG. 12, the contents 50 are filled into the body 11. In this case, since the trunk | drum 11 is in the open state over the whole region, the content 50 can be easily filled into the trunk | drum 11. FIG.

  Subsequently, as shown in FIG. 12, the second stacked body 42 is overlaid on the first stacked body 41, and the body 11 filled with the contents 50 is covered with the second stacked body 42. Subsequently, the second laminated body 42 is joined to the flange portion 12 that spreads outward from the upper portion of the body portion 11 of the first laminated body 41 using the joining device 95 to form the outer edge seal portion 25.

  Subsequently, as shown in FIG. 13, the first stacked body 41 and the second stacked body 42 are cut at the outer edge seal portion 25. In this way, the container 1 including the main body portion 10 having the body portion 11 and the flange portion 12 and the lid portion 20 joined to the flange portion 12 and containing the contents 50 can be obtained.

Following use of the container, how to use the container 1 will be described with reference to FIGS. 14 and 15.

  First, the container 1 is heated using a microwave oven or the like. Thereby, the water which exists in the contents 50 and the accommodating part 101 evaporates, and the pressure of the accommodating part 101 increases. As a result, as shown in FIG. 14, a portion of the palm seal portion 32 that is close to the center of the housing portion 101 is peeled off, and a peeled portion 34 is formed in the vicinity of the through hole 33. When peeling of the joint seal portion 32 proceeds and the peeling portion 34 reaches the through hole 33, the vapor in the housing portion 101 comes out through the through hole 33 to the outside.

  After heating the container 1, the user tears the container 1 using the opening means 27. Specifically, the user first holds the left and right main body parts 10 and the lid part 20 of the notch 28 with the left and right hands, respectively. Subsequently, the main body 10 and the lid 20 on the right side of the notch 28 are pulled forward with the right hand. Here, in this Embodiment, the 1st laminated body 41 and the 2nd laminated body 42 are comprised so that the tear strength of the main-body part 10 and the cover part 20 may be 15 N or less. For this reason, as shown in FIG. 15, the tearing of the main body portion 10 and the lid portion 20 can proceed along the first edge portion 13 in the first direction D1 with the notch 28 as a starting point.

(Effect of this embodiment)
As described above, in the manufacturing process of the container 1, the contents 50 are filled into the first laminated body 41 in which the trunk portion 11 is formed, and then the trunk portion 11 is covered with the second laminated body 42. For this reason, the contents 50 can be easily filled as compared with a pouch type container. That is, the container 1 according to the present embodiment has filling suitability.

  Further, as described above, the degree of drawing in the main body 10 of the container 1 according to the present embodiment is relatively small. For this reason, as the 1st laminated body 41 which comprises the main-body part 10, the laminated body provided with tearability, such as a laminated body containing a stretched film, can be used. Thereby, tearability can be imparted to the container 1.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, modified examples will be described with reference to the drawings as necessary. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted. In addition, when it is clear that the operational effects obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

(First variation of container)
In the above-described embodiment, the example in which the steam escape mechanism 30 includes the through hole 33 formed in the joint seal portion 32 has been described. However, the configuration of the steam release mechanism 30 is arbitrary as long as the accommodating portion 101 can communicate with the outside of the container 1 when the pressure in the accommodating portion 101 increases. For example, as shown in FIG. 16, the steam release mechanism 30 includes a projecting seal portion 35 projecting inward from the outer edge seal portion 25, a non-seal portion 37 adjacent to the projecting seal portion 35, and a lid portion in the non-seal portion 37. 20 may be included. A cut may be provided instead of the through hole 36.

(Second modification of container)
Moreover, in the above-mentioned embodiment, the opening means 27 showed the example containing the notch 28 formed in edge parts, such as the 3rd edge part 15 of the flange part 12. As shown in FIG. However, the configuration of the opening means 27 is arbitrary as long as the tearability of the main body 10 and the lid 20 can be improved. For example, as shown in FIG. 17, the opening means 27 may be a region including a scar group 29 formed so as to spread from the third edge 15 side to the fourth edge 16 side along the first direction D1. Good. The scar group includes, for example, a plurality of through holes formed so as to penetrate through the first base material 43 of the first laminate 41 constituting the flange portion 12 of the main body portion 10 but not through the thermoplastic resin layer 45. . Further, the scar group includes, for example, a plurality of through holes formed so as to penetrate the first base material 43 of the second laminated body 42 constituting the lid portion 20 but not to penetrate the thermoplastic resin layer 45. In addition, the opening means 27 may be a region including a half-cut line formed so as to spread along the first direction D1 from the third edge 15 side to the fourth edge 16 side. Further, the scar group may be formed so as to penetrate from the outer surface to the inner surface of the first stacked body 41 or the second stacked body 42.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to description of a following example, unless the summary is exceeded.

Example 1
As the 1st laminated body 41 which comprises the main-body part 10, the laminated body which is the same as the 1st laminated body 41 shown in FIG. 4 except the point which does not have the printing layer 44 was prepared. As the first base material 43, biaxially stretched PET having a thickness of 12 μm was used. As the second substrate 46, stretched nylon (ONY) having a thickness of 15 μm was used. As the thermoplastic resin layer 45, unstretched polypropylene (CPP) having a thickness of 70 μm was used. As an adhesive layer between the first base material 43 and the second base material 46 and between the second base material 46 and the thermoplastic resin layer 45, a cured product of a polyether polyol and an isocyanate compound was used. . In addition, a laminate having the same layer configuration as the first laminate 41 was prepared as the second laminate 42 constituting the lid portion 20. The thickness of the 1st laminated body 41 and the 2nd laminated body 42 was 101 micrometers.

  A container 1 shown in FIG. 1 was produced using the first laminate 41 and the second laminate 42. Moreover, the test piece 60 shown in FIG. Subsequently, the tear strength of the three test pieces 60 was measured based on the method shown in FIGS. 6 and 7. As a result, the tear strength was in the range of 3N or more and 15N or less.

(Comparative Example 1)
As the 1st laminated body 41 which comprises the main-body part 10, the laminated body which is the same as the 1st laminated body 41 shown in FIG. 5 except the point which does not have the printing layer 44 was prepared. As the first base material 43, unstretched polypropylene (CPP) was used. As the intermediate layer 47, EVOH was used. As the thermoplastic resin layer 45, unstretched polypropylene (CPP) was used. The thickness of the 1st laminated body 41 was 150 micrometers. Further, as the second stacked body 42, a stacked body having the same layer configuration as that of the second stacked body 42 of Example 1 was prepared.

  A container 1 shown in FIG. 1 was produced using the first laminate 41 and the second laminate 42. Moreover, the test piece 60 shown in FIG. Subsequently, the tear strength of the test piece 60 was measured based on the method shown in FIGS. As a result, the 1st laminated body 41 which comprises the main-body part 10 extended, the test piece 60 could not be torn, and tear strength was not able to be measured.

DESCRIPTION OF SYMBOLS 1 Container 10 Main body part 101 Storage part 11 Trunk part 12 Flange part 121 Projection part 13 1st edge part 14 2nd edge part 15 3rd edge part 16 4th edge part 20 Lid part 21 1st cover part 22 2nd cover part 25 Outer seal part 26 Non-seal part 27 Unsealing means 28 Notch 29 Scar group 30 Steam escape mechanism 31 Joint part 32 Joint seal part 33 Through hole 34 Peeling part 35 Protruding seal part 36 Through hole 37 Non-seal part 41 First laminate 42 Second laminate 43 First substrate 44 Print layer 45 Thermoplastic resin layer 46 Second substrate 47 Intermediate layer 50 Contents 60 Test piece 65 Sealing portion 66 Notch 67 End point 71 First gripper 72 Second gripper 80 Test Piece 81 First gripping tool 82 Second gripping tool 91 Male mold 92 Female mold 93 Holding plate 95 Joining device

Claims (11)

A container having an accommodating portion for accommodating contents,
A main body having a body part defining the housing part and a flange part extending outward from the upper part of the body part, the main body part constituted by the first laminate;
A lid part joined to the flange part of the main body part via an outer edge seal part so as to cover the housing part, and a lid part constituted by a second laminate;
A vapor venting mechanism configured to communicate the housing with the outside of the container when the pressure in the housing increases.
An opening means formed on the lid portion and the flange portion,
The container whose tear strength of the said main-body part and the said cover part is 15 N or less. The flange includes a first edge and a second edge extending in a first direction parallel to each other,
The container according to claim 1, wherein the unsealing means is configured to easily tear the main body portion and the lid portion in the first direction.   The said opening means is comprised so that it may be easy to tear the said flange part extended along the said 1st edge in the position inside the said outer edge seal | sticker part extended along the said 1st edge. Container as described in.   The first laminated body has at least a thermoplastic resin layer constituting an inner surface located on the housing portion side and a first base material including a stretched film stretched along the first direction. The container according to 2 or 3.   The container according to any one of claims 1 to 4, wherein the opening means includes at least a notch or a scar group formed in the flange portion.   The container according to any one of claims 1 to 5, wherein a bonding strength between the flange portion and the lid portion is 23N or more.   The container as described in any one of Claims 1 thru | or 6 whose depth of the said trunk | drum is 5 mm or more and 20 mm or less.   The container as described in any one of Claims 1 thru | or 7 whose thickness of a said 1st laminated body is 150 micrometers or less. A method of manufacturing a container having a container for storing contents, and having a steam escape mechanism configured to communicate the container with the outside when the pressure of the container increases.
Preparing a first laminated body for constituting a main body having a body part defining the housing part and a flange part extending outward from an upper part of the body part;
Forming the body by drawing the first laminate;
Filling the barrel with contents;
A step of stacking a second laminated body for constituting a lid part covering the accommodating part on the first laminated body;
Bonding the second laminate to a flange portion that spreads outward from the upper portion of the body portion of the first laminate, and
The flange portion is formed with an opening means,
The said drawing is a manufacturing method of a container with which the temperature of a said 1st laminated body is implemented at the temperature lower than melting | fusing point of the thermoplastic resin layer of a said 1st laminated body.   The container manufacturing method according to claim 9, wherein the tear strength of the main body portion and the lid portion is 15 N or less. The flange includes a first edge and a second edge extending in a first direction parallel to each other,
The method for manufacturing a container according to claim 9 or 10, wherein the opening means is configured to easily tear the main body portion and the lid portion in the first direction.