WO2024034653A1 - Lid, cup container, package, and package with content therein - Google Patents

Lid, cup container, package, and package with content therein Download PDF

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Publication number
WO2024034653A1
WO2024034653A1 PCT/JP2023/029184 JP2023029184W WO2024034653A1 WO 2024034653 A1 WO2024034653 A1 WO 2024034653A1 JP 2023029184 W JP2023029184 W JP 2023029184W WO 2024034653 A1 WO2024034653 A1 WO 2024034653A1
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WO
WIPO (PCT)
Prior art keywords
flange
lid
orientation
container
cup container
Prior art date
Application number
PCT/JP2023/029184
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French (fr)
Japanese (ja)
Inventor
裕二 竹内
裕子 滑川
Original Assignee
大和製罐株式会社
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Filing date
Publication date
Application filed by 大和製罐株式会社 filed Critical 大和製罐株式会社
Publication of WO2024034653A1 publication Critical patent/WO2024034653A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package

Definitions

  • the present invention relates to a lid, a cup container, a package, and a package containing contents that release steam generated when packaged contents are heated in a microwave oven to the outside.
  • Japanese Patent Application Publication No. 2019-64642 discloses that water vapor is released during heating in a microwave oven by providing a fractured portion having a non-oriented portion facing each other across the oriented portion of a crystalline stretched oriented film.
  • a cup container and film are disclosed.
  • Japanese Patent Application Laid-Open No. 2017-74965 discloses a cup container and a film that perform steaming without excessively releasing water vapor.
  • the present invention can provide a lid, a cup container, a package, and a package with contents in which the break portion opens before the seal portion of the flange.
  • a lid according to one aspect of the present invention is a lid that is heat-sealed to a flange of a cup container, and includes an outer layer film that is molecularly oriented by biaxial stretching, and a heat-sealed outer layer film that is laminated to the outer layer film and that is heat-sealed to a flange of a cup container.
  • An inner layer film that can be attached, one or more orientation relaxing portions formed on the outer layer film, and one or more orientation relaxing portions are formed at opposing positions with a predetermined interval, and the internal pressure of the container is increased by a microwave oven.
  • a fractured portion that is fractured by the flange, and the opening strength of the fractured portion is smaller than the sealing strength that is heat-sealed to the flange.
  • the present invention can provide a lid, a cup container, a package, and a package containing contents, in which the rupture portion opens before the seal portion of the flange.
  • FIG. 1 is a perspective view showing the configuration of a cup container as a package according to a first embodiment of the present invention.
  • FIG. 2 is a plan view showing an example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the cup container.
  • FIG. 3 is a cross-sectional view taken along the line III--III in FIG. 2, showing the layer structure of the film used in the cup container.
  • FIG. 4 is a perspective view showing a state in which the cup container is heated in a microwave oven as an example of use.
  • FIG. 5 is a plan view showing an example of the structure of one orientation relaxing part and one breaking part provided in the same cup container.
  • FIG. 6 is a plan view showing another example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the same cup container.
  • FIG. 7 is a plan view showing another example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the same cup container.
  • FIG. 8 is a plan view showing another example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the same cup container.
  • FIG. 9 is a plan view showing another example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the same cup container.
  • FIG. 10 is a plan view showing another example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the same cup container.
  • FIG. 11 is a plan view showing another example of the configuration of three or more orientation relaxing parts and breaking parts provided in the same cup container.
  • FIG. 12 is a plan view showing another example of the configuration of three or more orientation relaxing parts and breaking parts provided in the same cup container.
  • FIG. 13 is a plan view showing another example of the configuration of three or more orientation relaxing parts and breaking parts provided in the same cup container.
  • FIG. 14 is a plan view showing an example of the configuration of a seal section provided in the cup container.
  • FIG. 15 is a plan view showing another example of the configuration of the seal portion provided in the cup container.
  • FIG. 16 is a plan view showing another example of the configuration of the seal section provided in the cup container.
  • FIG. 17 is a plan view showing another example of the configuration of the seal portion provided in the cup container.
  • FIG. 12 is a plan view showing another example of the configuration of three or more orientation relaxing parts and breaking parts provided in the same cup container.
  • FIG. 13 is a plan view showing another example of the configuration of three or
  • FIG. 18 is a plan view showing another example of the configuration of the seal portion provided in the cup container.
  • FIG. 19 is a plan view showing another example of the configuration of the seal portion provided in the cup container.
  • FIG. 20 is a perspective view showing the structure of a pouch container as a package according to a second embodiment of the present invention.
  • FIG. 1 is a perspective view showing the structure of a package 1 according to an embodiment of the present invention
  • FIG. 2 is a plan view showing an example of the structure of a pair of orientation relaxation parts 21a and a breaking part 13 provided in the package 1.
  • FIG. 3 is a cross-sectional view schematically showing the layered structure of the lid 11 used in the package 1.
  • FIG. 4 is a perspective view showing a state where the package 1 is heated in a microwave oven as an example of use.
  • the package 1 is a packaging container that is configured by heat-sealing (welding) two or more members and packages the contents 100 inside.
  • the package 1 is a container for heating in a microwave oven that accommodates contents so that it can be heated in a microwave oven.
  • the package 1 is, for example, a cup container or a pouch container.
  • the package 1 is a cup container formed by heat-sealing a cup body and a lid as two members, and hereinafter, the package 1 will be described as the cup container 1.
  • the cup container 1 is a packaging container in which the contents 100 are filled and packaged.
  • the cup container 1 is a container for heating in a microwave oven that accommodates a content 100 that can be heated in a microwave oven.
  • the cup container 1 includes a bottomed cylindrical cup body 10 and a lid 11 that seals the cup body 10.
  • the cup body 10 is formed of a resin material, a paper material, or a composite material thereof.
  • the cup body 10 includes a bottomed cylindrical body 10a and a flange 10b formed at the outer peripheral edge of the opening of the body 10a.
  • the cup body 10 also includes a plurality of ribs 10c that connect the outer peripheral surface of the body 10a and the lower surface of the flange 10b.
  • the body portion 10a is formed into a cylindrical shape, a rectangular tube shape, a polygonal tube shape, or the like.
  • the body portion 10a is formed to have a volume capable of accommodating a desired amount of contents 100 therein.
  • the flange 10b is formed into an annular flat plate shape extending perpendicularly to the axial direction of the cup body 10 along the opening shape of the cup body 10.
  • the plurality of ribs 10c improve the strength of the opening of the body 10a and the flange 10b by being continuous with the body 10a and the flange 10b.
  • the plurality of ribs 10c are arranged at equal or non-equal intervals in the circumferential direction. Note that the number, shape, and spacing of the ribs 10c are appropriately set depending on the strength required for the opening of the body portion 10a and the flange 10b.
  • the lid 11 is formed of a laminated film having a biaxially stretched oriented film 21 on its outer surface.
  • the lid 11 is fixed by a seal portion 30 formed by heat-sealing to the flange 10b of the cup body 10.
  • the lid 11 has a tab 11a that can be pinched when removed from the fixed flange 10b.
  • the lid 11 also includes a broken portion 13 that forms a steam port 21c through which steam is discharged by breaking when the internal pressure of the cup container 1 increases.
  • the content 100 is something that contains moisture and is heated in a microwave oven, such as food that is heated in a microwave oven or a wet towel that is heated in a microwave oven.
  • the outer shape of the lid 11, except for the tab 11a, is formed to be the same shape as the outer peripheral edge shape of the flange 10b or approximately the same shape that is slightly larger than the outer peripheral edge shape of the flange 10b, and the tab 11a can be easily pinched with fingers.
  • it may be formed into a substantially triangular or semicircular shape so as to protrude outward.
  • the lid 11 (the film constituting the lid 11) includes, from the outer surface side of the cup container 1 when the cup container 1 is formed, a biaxially stretched oriented film 21 which is an outer layer film, an adhesive layer 22, and an inner layer film. A sealant film 23 is provided. Further, the lid 11 may have a printed layer on the outer surface of the biaxially stretched oriented film 21 or between the biaxially stretched oriented film 21 and the sealant film 23, on which product information or designs are applied. . Note that the layer structure of the lid 11 is not limited to this, and may be any structure as long as it has two or more layers and includes the biaxially stretched oriented film 21 in at least one layer.
  • the biaxially stretched oriented film 21 includes an orientation relaxing portion 21a formed by heating a portion to a predetermined temperature or higher near the melting point.
  • the orientation relaxing portion 21 a constitutes a part of the fracture portion 13 .
  • the orientation relaxing portion 21a is configured in various shapes depending on the configuration of the fracture portion 13.
  • the biaxially stretched oriented film 21 is a crystalline stretched oriented film.
  • the biaxially stretched oriented film 21 is constituted by, for example, a general-purpose biaxially stretched film such as a biaxially stretched PET film, a biaxially stretched nylon film, a biaxially stretched PP film, or a composite film thereof.
  • the biaxially stretched oriented film 21 is a biaxially stretched film having barrier properties such as a biaxially stretched PVA film, a biaxially stretched EVOH film, PP/EVOH/PP, NY/EVOH/ Examples include coextruded biaxially stretched films having a barrier resin such as NY, NY/MXD-NY/NY in the intermediate layer.
  • a film obtained by coating a general-purpose biaxially stretched film with a PVA-based, PVDC, or PAA-based barrier resin, or a hybrid coated film in which an inorganic substance is dispersed in the above-mentioned barrier resin can also be suitably used as the biaxially stretched oriented film 21.
  • the thickness of the biaxially stretched oriented film 21 is preferably 12 ⁇ m or more and 50 ⁇ m or less.
  • the thickness of the biaxially stretched oriented film 21 is less than 12 ⁇ m, there is a risk that the physical strength of the cup container 1 will decrease, and the film forming technique will be difficult, leading to an increase in cost. Further, if the thickness of the biaxially stretched oriented film 21 exceeds 50 ⁇ m, it becomes difficult for the lid 11 including the biaxially stretched oriented film 21 to stretch.
  • the thickness of the biaxially stretched oriented film 21 is not limited as long as the breaking portion 13 is broken depending on the shape of the orientation relaxing portion 21a or the like.
  • the orientation relaxing portion 21a is formed by heating the biaxially stretched oriented film 21 to a predetermined temperature or higher near the melting point to relax the orientation or eliminate the orientation. That is, the biaxially stretched oriented film 21 of the lid 11 has an orientation relaxing portion 21a heated to a predetermined temperature near the melting point or higher in a part of the oriented portion 21b having an orientation that has not been heated above a predetermined temperature near the melting point.
  • the predetermined temperature near the melting point differs depending on the biaxially stretched oriented film 21, but at least the orientation can be relaxed and the tensile elastic modulus, elongation at break, etc. of the orientation relaxed part 21a and the oriented part 21b can have a desired relationship. It's temperature.
  • the tensile elastic modulus in the molecular orientation part of the lid 11 is E1
  • the tensile elastic modulus in the molecular orientation relaxing part is E2
  • the tensile elastic modulus E1 of the oriented part 21b and the tensile elastic modulus E2 of the orientation relaxing part 21a are E2
  • the relationship is, for example, 0 ⁇ E2/E1 ⁇ 0.5.
  • the molecularly oriented portion of the lid 11 is a portion of the lid 11 having the biaxially oriented oriented film 21, the adhesive layer 22, and the sealant film 23, where the oriented portion 21b of the biaxially oriented film 21 exists
  • the molecular orientation relaxing portion is a portion of the lid 11 where the orientation relaxing portion 21a of the biaxially stretched oriented film 21 exists.
  • the tensile modulus E1 of the molecularly oriented portion of the lid 11 is approximately 2000 MPa
  • the tensile modulus E2 of the molecularly oriented relaxed portion is approximately 200 MPa. It is.
  • E2/E1 is approximately 0.1, which is less than 0.5.
  • thermoforming a heating method for the biaxially stretched oriented film 21 to form the orientation relaxed portion 21a in the biaxially stretched oriented film 21 methods such as laser beam heating, hot plate heating, impulse heating, and near-infrared heating may be used. preferable.
  • laser beam heating and near-infrared heating have the advantage of being able to heat the biaxially stretched oriented film 21 without contact, but laser beam heating is preferable because local heating is possible.
  • a laser light absorbing material that improves the laser light absorbability is added to the biaxially stretched oriented film 21. may be blended in advance with the material of the stretched oriented film 21, or the biaxially stretched oriented film 21 may be coated with a laser light absorbing material.
  • the type of laser beam it is preferable to use a carbon dioxide laser, since most of the resin materials used for the biaxially stretched oriented film 21 have relatively high absorbency.
  • the laser light absorbing material can be appropriately selected depending on the type of laser light. These heating methods can be appropriately selected depending on the material of the biaxially stretched oriented film 21 to be used.
  • a treatment such as Teflon (registered trademark) surface treatment is applied to the presser head so that the resin of the molten biaxially stretched oriented film 21 and the resin of the sealant film 23 do not stick to the presser head. It is preferable to do so.
  • a pressing head heated and set at a temperature higher than a predetermined temperature near the melting point of the biaxially stretched oriented film 21 is pressed against the biaxially stretched oriented film 21 to melt and heat it.
  • the orientation relaxing portion 21a is formed.
  • the formed orientation relaxing portion 21a is properly formed can be determined by inspecting the formed biaxially stretched oriented film 21.
  • this inspection method crystallinity measurement using X-ray diffraction, FT-IR (Fourier transform infrared spectroscopy), DSC (differential scanning calorimetry), orientation viewer using a polarizing plate, etc. can be used.
  • the elongation at break of the oriented portion 21b is set to 200% or less, and the elongation at break of the orientation relaxed portion 21a is set to 300% or more.
  • the adhesive layer 22 can be appropriately selected from adhesives for dry lamination for general food use. However, since the cup container 1 is used for heating in a microwave oven, it is preferable that the adhesive layer 22 has heat resistance.
  • the thickness of the adhesive layer 22 is preferably 2 ⁇ m to 5 ⁇ m from the viewpoint of performance and economy.
  • the sealant film 23 is composed of, for example, an unstretched low-density polyethylene (LDPE) film, an unstretched linear low-density polyethylene (LLDPE) film, an unstretched polypropylene (PP) film, an unstretched polyethylene terephthalate film, or the like.
  • the thickness of the sealant film 23 is preferably 10 ⁇ m or more and 100 ⁇ m or less. Note that the thickness of the sealant film 23 is more preferably 20 ⁇ m or more and 60 ⁇ m or less.
  • the thickness of the sealant film 23 is less than 10 ⁇ m, the practical strength of the package 1 may be insufficient, and the seal portion 30 may easily break due to vibration during transportation or impact from dropping. be.
  • the thickness of the sealant film 23 exceeds 100 ⁇ m, it becomes difficult to stretch, which may cause a problem in reliability with respect to steam release.
  • the fracture portion 13 is formed by the orientation portion 21b arranged between the opposing orientation relaxation portions 21a. That is, the broken part 13 is provided in a part of the lid 11, and has a single orientation relaxing part 21a extending in a linear shape such as a straight line or a curved line, and having two parts facing each other with a predetermined interval. By arranging one or more orientation relaxing parts 21a to face each other, the orientation part 21b is formed between the orientation relaxing parts 21a. That is, the fractured part 13 is the oriented part 21b that is not heated above a predetermined temperature near the melting point of the biaxially stretched oriented film 21, in other words, the oriented part 21b of the biaxially stretched oriented film 21 that has an orientation is interposed and the orientation is relaxed. It is constructed by partially opposing the portions 21a.
  • one or more orientation relaxing portions 21a are provided, each having a short side and a long side.
  • one orientation relaxation part 21a is provided, as shown in FIG. face each other at a predetermined distance.
  • the two orientation relaxation portions 21a may face each other with their short sides separated by a predetermined distance, as shown in FIGS. 2 and 6 to 8, or , 9 and 10, the short side of one orientation relaxing part 21a and the long side of the other orientation relaxing part 21a face each other with a predetermined interval.
  • the orientation relaxation parts 21a when a plurality of orientation relaxation parts 21a are provided in the fracture part 13, it is preferable that the orientation relaxation parts 21a have the same size and shape as shown in FIG. If so, they may be of different sizes and shapes, as shown in FIG.
  • the fracture portion 13 is formed by one or more orientation relaxing portions 21a where the biaxially stretched oriented film 21 is heated by a predetermined distance across the oriented portion 21b having the orientation of the biaxially stretched oriented film 21. It consists of being placed close to each other with a distance between them.
  • the predetermined distance can be set as appropriate as long as it is a distance that allows the fracture portion 13 to fracture and form the steam port 21c during microwave heating, but is preferably less than 5 mm.
  • the long side and the short side are not limited to straight lines, but may be curved lines.
  • the fractured part 13 is configured in such a shape that the orientation relaxing part 21a extends in either direction, and one end of one orientation relaxing part 21a is connected to another part of the same orientation relaxing part 21a or another orientation relaxing part 21a. It is sufficient to face a part of the portion 21a with a predetermined distance therebetween. Note that, as long as the fracture portion 13 can be fractured to form the steam port 21c, a portion of the orientation portion 21b sandwiched between the opposing orientation relaxation portions 21a may be relaxed.
  • the shape of one orientation relaxing portion 21a may be a partially cut-out circular ring shape, a polygonal ring shape, or the like, as shown in FIG.
  • the two orientation relaxation portions 21a may be configured to be linear and face each other so that their short sides intersect with each other in a straight line or at a predetermined angle.
  • a T-shaped structure in which the short sides and long sides are opposite to each other can be considered.
  • the two orientation relaxing portions 21a may have a wave-like configuration, as shown in FIG. 8, in addition to the linear configuration.
  • the longitudinal direction may be arranged in one direction, or as shown in FIG. A configuration in which they are lined up in the direction is conceivable.
  • the orientation relaxing portions 21a be formed in a rectangular shape long in one direction and provided in pairs, with the short sides facing each other, as shown in FIG.
  • the orientation relaxation part 21a shown in FIG. 2 has a short side length in the range of 0.5 to 10 mm, a long side length in the range of 3 to 100 mm, and the length of the short side is longer than the length of the long side. is preferably set to a short range, and is appropriately selected depending on the size of the cup container 1 and the configuration of the lid 11. Further, the distance between the opposing short sides of the two orientation relaxation parts 21a is set to less than 5 mm, more preferably set to 0.5 to 3.0 mm, depending on the size of the cup container 1 and the lid 11. Select as appropriate depending on the configuration.
  • the dimension of the orientation relaxation part 21a is less than this range, the range in which it expands is too narrow and steam release may not be effective.If it exceeds this range, the strength of the lid 11 will be reduced and the gas barrier properties will be significantly affected. This is because there is a possibility that Furthermore, if the distance between the opposing short sides of the two orientation relaxation parts 21a is less than this range, there is a risk that the tips of the opposing orientation relaxation parts 21a will become integrated and burst without being able to form the steam port 21c.
  • the region between the opposing short sides of the two orientation relaxation parts 21a will not be able to expand, so the breakage part 13 will not break and the cup container 1 will not be able to form the steam port 21c. This is because there is a risk of it bursting.
  • the seal portion 30, which is formed by heat-sealing the lid 11 to the flange 10b, is formed in an annular shape along the flange 10b.
  • the width is set smaller than the radial width.
  • the seal portion 30 is provided inward from the outer peripheral edge of the flange 10b, more specifically, on the inner peripheral edge side of the flange 10b.
  • the sealing strength of the seal portion 30 to the flange 10b of the lid 11 is higher than the opening strength of the rupture portion 13 at which the rupture portion 13 ruptures due to an increase in the internal pressure of the cup container 1.
  • the sealing strength and the opening strength are, for example, the strength after heating when the internal pressure increases and the lid 11 expands, that is, when the contents are heated in a microwave oven.
  • the seal portion 30 may include a plurality of narrow portions having a narrow width in the radial direction. 31 and a plurality of wide portions 32 that are wide in the radial direction at least in part.
  • the plurality of narrow width portions 31 and the plurality of wide width portions 32 are provided at positions facing at least the tab 11a in the width direction (radial direction).
  • the seal portion 30 is formed in an annular shape, the inner peripheral edge is formed in a shape along the flange 10b, for example, a circular shape, and the outer peripheral edge is formed intermittently at intervals in the circumferential direction.
  • a plurality of narrow width portions 31 and a plurality of wide width portions 32 are formed.
  • the seal portion 30 includes a plurality of narrow width portions 31 and a plurality of wide width portions 32 alternately provided at equal intervals in all regions in the circumferential direction.
  • a plurality of narrow portions 31 and a plurality of wide portions 32 of the portion face the tab 11a in the width direction.
  • the widths of the plurality of narrow parts 31 and the plurality of wide parts 32 are each smaller than the width of the flange 10b.
  • the narrow portion 31 is formed to have a constant width.
  • the wide portion 32 has a shape that projects outward in the radial direction and gradually narrows in width in a direction perpendicular to the radial direction, for example, a semicircular shape shown in FIGS. 2 and 14. Alternatively, it is formed into a triangular shape as shown in FIGS. 15 and 16.
  • the wide portion 32 may have a rectangular shape that extends outward in the radial direction so that the width in the direction perpendicular to the radial direction is constant, as shown in FIGS. 17 and 18, for example.
  • the seal portion 30 may have a configuration in which it does not have the wide portion 32 and is formed by an annular narrow portion 31 having the same width.
  • a method for manufacturing such a cup container 1 will be explained.
  • a part of the film constituting the lid 11 is heated to a temperature higher than a predetermined temperature near the melting point of the biaxially stretched oriented film 21 to eliminate the orientation of the part of the biaxially stretched oriented film 21, so that the film is oriented in a predetermined shape.
  • a relaxing portion 21a is formed.
  • a part of the lid 11 is irradiated with a laser beam such as a carbon dioxide gas laser with an output that raises the biaxially stretched oriented film 21 to a predetermined temperature or higher near the melting point.
  • a laser beam is scanned over the shape of the orientation relaxing portion 21a to be formed.
  • a laser beam is scanned over the shape of one orientation relaxation part 21a, and then the laser light irradiation is stopped and the position where the other orientation relaxation part 21a is to be formed is again moved. Irradiates laser light.
  • the shape of the other orientation relaxing portion 21a is scanned with a laser beam. Note that at this time, the orientation-relaxed portion 21a only needs to have its orientation relaxed, and it is not necessary to irradiate the laser beam until the orientation disappears or becomes non-orientated, but the orientation-relaxed portion 21a may be non-oriented.
  • the lid 11 is heated to form the orientation relaxing portion 21a.
  • the lid 11 in which the broken portion 13 is formed in a portion is manufactured.
  • the breaking portion 13 may be formed after the film is cut into the shape of the lid 11, or may be formed before the film is cut into the shape of the lid 11.
  • the cup body 10 is filled with a predetermined amount of contents 100.
  • the lid 11 is placed on the flange 10b, and the lid 11 is heat-sealed to the flange 10b to form the sealing part 30, so that the contents are contained and the sealed cup container 1 (cup container with contents) is formed.
  • Heat sealing is performed, for example, by pressing a heat sealing mold formed in the shape of the seal portion 30 against the lid 11.
  • the cup container 1 containing the contents is placed in a microwave oven, and then the contents are heated by the microwave oven.
  • the contents are heated in a microwave oven, water vapor is generated from the contents, the internal pressure increases, the cup container 1 expands, and the lid 11 extends.
  • the lid 11 expands, the fracture portion 13 between the opposing short sides of the orientation relaxing portion 21a or between the opposing short and long sides breaks, and the steam in the cup container 1 escapes to the outside, reducing the internal pressure. Then, steam is vented.
  • the vapor generated from the contents may contain alcohol vapor.
  • the breaking portion 13 breaking and steam being discharged from the cup container 1 will be specifically explained.
  • the cup container 1 packed with contents containing moisture is heated in a microwave oven, water vapor is generated from the contents, internal pressure increases, and as a result, the cup container 1 expands.
  • the LDPE, LLDPE, CPP, etc. used for the sealant film 23 are usually unstretched, that is, unoriented, and therefore have a lower tensile strength and a higher elongation at break than a stretched film.
  • the biaxially stretched oriented film 21 usually has a high tensile strength and a low breaking elongation value, so the lid 11 with the biaxially stretched oriented film 21 and the sealant film 23 bonded together is difficult to stretch.
  • the orientation relaxed portion 21a of the biaxially stretched oriented film 21 is a region where the orientation of the biaxially stretched oriented film 21 is relaxed or is in a non-oriented state
  • the orientation of the biaxially stretched oriented film 21 is The tensile strength is lower than that of the oriented region which is part 21b.
  • the tensile elastic modulus E2 of the molecular orientation relaxing portion is lower than the tensile elastic modulus E1 of the molecular orientation portion. Then, when the internal pressure increases and the cup container 1 expands and the lid 11 expands, the lid 11 in the region of the orientation relaxation part 21a expands in the width direction due to stress concentration.
  • the lid 11 of the region of the orientation section 21b located between the opposing short sides of the orientation relaxation section 21a or between the opposing short and long sides also expands following the expansion of the region of the orientation relaxation section 21a.
  • the region of the relaxing portion 21a has a higher elongation at break and a lower tensile modulus.
  • the seal strength of the seal portion 30 is higher than the opening strength of the fracture portion 13.
  • the user pinches the tab 11a and moves the lid 11 in a direction away from the cup body 10, so that the lid 11 is peeled off from the flange 10b. This allows the contents to be taken out from the cup body 10.
  • the sealing strength when the cup body 10 and the lid 11 are heat-sealed (thermally fused) is made higher than the opening strength of the fracture portion 13.
  • the seal portion 30 of the cup body 10 and the lid 11 is not located on the outer peripheral edge of the flange 10b but is heat-sealed on the inner peripheral edge of the flange 10b, when the lid 11 is peeled off from the flange 10b, the flange 10b can be prevented from deforming. Therefore, the force in the direction of peeling off the lid 11 from the flange 10b is concentrated on the seal portion 30, so even if the sealing strength of the seal portion 30 is higher than the opening strength of the broken portion 13, the lid 11 can be easily peeled off. can be done.
  • the cup body 10 can suppress deformation of the flange 10b, so that the lid 11 can be easily peeled off.
  • the seal portion 30 is configured such that the narrow portion 31 and the wide portion 32 are provided at least in a portion facing the tab 11a, and the wide portion 32 protrudes outward in the radial direction. Stress when the lid 11 is moved in the peeling direction is concentrated at the tip. Therefore, the base point at which the lid 11 is peeled off from the flange 10b occurs at the tip of the wide portion 32, so that the releasability of the lid 11 is increased, and the lid 11 can be easily peeled off.
  • the seal portion 30 does not protrude inward and the inner peripheral edge of the seal portion 30 has the same shape as the flange 10b, so when the cup container 1 is heated, the internal pressure increases and the lid 11 is deformed. Even if the seal portion 30 is removed, it is possible to prevent the seal portion 30 from peeling off.
  • the sealing strength of the seal portion 30 of the cup body 10 and the lid 11 is made higher than the opening strength of the breaking portion 13, thereby ensuring that the breaking portion 13 is opened. It becomes possible to do so.
  • the present invention is not limited to the above embodiments.
  • the configuration in which the package 1 is a cup container is explained, but the package 1 is not limited to this, and the package 1 has two or more members integrally formed by heat sealing, and has a broken part in part. 13 can be applied to various packaging containers.
  • the package 1 may be a pouch container.
  • FIG. 20 the configuration of a pouch container 1A as a package will be described using FIG. 20.
  • the same components as those of the cup container 1 of the first embodiment described above are denoted by the same reference numerals, and detailed explanation thereof will be omitted.
  • the pouch container 1A is a bag-like container that stores contents 100 such as food and can be heated in a microwave oven. Further, the pouch container 1A is, for example, a standing pouch that can stand on its own.
  • the pouch container 1A includes a body 41 and a bottom 42 provided integrally with the body 41.
  • the pouch container 1A is configured into a bag shape having a body 41 and a bottom 42 by heat-sealing a pair of rectangular body sheets 51 and a rectangular bottom sheet 52 long in one direction. . That is, the pouch container 1A is a package constructed by heat-sealing three members.
  • the trunk 41 is composed of a pair of trunk sheets 51.
  • the bottom portion 42 is constituted by the lower end portions of the pair of trunk sheets 51 and the bottom sheet 52.
  • the body sheet 51 and the bottom sheet 52 have the same layer structure as the film forming the lid 11 described above. That is, as shown in FIG. 3, the trunk sheet 51 and the bottom sheet 52 are formed of a laminated film having a biaxially stretched oriented film 21 on the outer surface side. For example, the body sheet 51 and the bottom sheet 52 have a biaxially stretched oriented film 21, an adhesive layer 22, and a sealant film 23. Note that the trunk sheet 51 and the bottom sheet 52 may have a printed layer.
  • At least one of the pair of trunk sheets 51 is provided with one or more orientation relaxing portions 21a, and the one or more orientation relaxing portions 21a form the fracture portion 13.
  • the sealant films 23 of the pair of trunk sheets 51 face each other, and between the lower parts of the pair of trunk sheets 51, the bottom sheet 52 constituting the bottom section 42 is connected to the trunk sheet 51.
  • the sealant film 23 of 51 and the sealant film 23 of the bottom sheet 52 are arranged to face each other, and the sides of the pair of body sheets 51 other than the upper part and the pair of body sheets 51 and bottom sheet 52 are thermally fused. is formed. That is, the seal portion 60 is formed on the pair of trunk sheet 51 and bottom sheet 52, so that the trunk section 41 and the bottom section 42 are formed into a bag shape.
  • the sealed pouch container 1A is formed by the seal portion 61 formed by thermally welding the upper portions of the pair of body portions 41.
  • the sealing strength of the sealing parts 60 and 61 of the pouch container 1A is set higher than the opening strength of the breakage part 13. This allows the pouch container 1A to reliably open the breakage portion 13.
  • the present invention provides a package in which a plurality of members are formed by heat-sealing, and the sealing strength of the seal portion formed by heat-sealing is made higher than the opening strength of the broken portion 13 provided in a part. This makes it possible to reliably open the fracture portion 13.
  • the present invention is not limited to the embodiments described above.
  • the lid 11 and the body sheet 51 have a higher elongation at break in the region of the orientation relaxation portion 21a than in the orientation portion 21b, and a tensile modulus of elasticity in the molecular orientation portion of the lid 11.
  • An example has been described in which the relationship between E1 and the tensile modulus E2 in the molecular orientation relaxed portion is 0 ⁇ E2/E1 ⁇ 0.5.
  • the lid 11 and the body sheet 51 may have a configuration in which either the elongation at break or the tensile modulus E2/E1 of the orientation relaxing portion 21a and the orientation portion 21b is set to the above-mentioned relationship.
  • the present invention is not limited to the above-described embodiments, and can be variously modified in the implementation stage without departing from the spirit thereof.
  • each embodiment may be implemented in combination as appropriate, and in that case, the combined effect can be obtained.
  • the embodiments described above include various inventions, and various inventions can be extracted by combinations selected from the plurality of constituent features disclosed. For example, if a problem can be solved and an effect can be obtained even if some constituent features are deleted from all the constituent features shown in the embodiment, the configuration from which these constituent features are deleted can be extracted as an invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Package Specialized In Special Use (AREA)

Abstract

A lid (11) is thermally fused to a flange (10b) of a cup container (1) and is provided with: an outer layer film (21) that is molecularly aligned by biaxial stretching; an inner layer film (23) that is laminated on the outer layer film (21) and that is thermally fusible to the flange (10b); one or more alignment relaxation parts (21a) that are formed in the outer layer film (21); and a breaking part (13) that is formed at a portion where the one or more alignment relaxation parts (21a) face each other with a predetermined interval therebetween and that is broken by an increase in the packaging inner pressure caused by an microwave oven. The opening strength of the breaking part (13) is smaller than the sealing strength at which the flange (10b) is thermally fused.

Description

蓋、カップ容器、包装体及び内容物入り包装体Lid, cup container, package and package with contents
　本発明は、包装した内容物を電子レンジで加熱したときに発生する蒸気を外部に放出する蓋、カップ容器、包装体及び内容物入り包装体に関する。 The present invention relates to a lid, a cup container, a package, and a package containing contents that release steam generated when packaged contents are heated in a microwave oven to the outside.
　従前から内容物を収容し、密封した状態で内容物を電子レンジで加熱する包装体が知られている。しかしながら、このような包装体は、電子レンジによって内容物を加熱すると、内圧が増加する。このため、電子レンジ加熱中に、蒸気を自動的に排出し、内圧を低下させる手段を備えた包装体も知られている。 BACKGROUND ART Packaging bodies that contain contents and heat the contents in a microwave oven in a sealed state have been known for some time. However, when the contents of such a package are heated in a microwave oven, the internal pressure increases. For this reason, packages are also known that are equipped with means for automatically discharging steam and lowering the internal pressure during heating in a microwave oven.
　例えば、日本国特開２０１９－６４６４２号公報には、結晶性延伸配向フィルムの配向部を挟んで対向配置された無配向部を有する破断部を設けることにより、電子レンジ加熱時に水蒸気を放出することができるカップ容器およびフィルムが開示されている。 For example, Japanese Patent Application Publication No. 2019-64642 discloses that water vapor is released during heating in a microwave oven by providing a fractured portion having a non-oriented portion facing each other across the oriented portion of a crystalline stretched oriented film. A cup container and film are disclosed.
　また、例えば、日本国特開２０１７－７４９６５号公報には、過度に水蒸気を放出することなく蒸らしを行うカップ容器及びフィルムが開示されている。 Furthermore, for example, Japanese Patent Application Laid-Open No. 2017-74965 discloses a cup container and a film that perform steaming without excessively releasing water vapor.
　また、これらのフィルムをフランジ付きのカップ容器やパウチ容器の一部に溶着する技術も知られている。 Additionally, techniques for welding these films to a part of a flanged cup container or pouch container are also known.
日本国特開２０１９－６４６４２号公報Japanese Patent Application Publication No. 2019-64642 日本国特開２０１７－７４９６５号公報Japanese Patent Application Publication No. 2017-74965
　上述した技術においては、フィルムの破断部が破断せず、水蒸気が放出されないことにより内圧が上がり過ぎ、フィルムとフランジとが熱溶着されたシール部が開口してしまう場合があった。このため、破断部の開口前に、フランジにおいて開口することを防止できる技術が求められている。 In the above-mentioned technique, the broken part of the film is not broken and water vapor is not released, so that the internal pressure rises too much and the seal part where the film and flange are thermally welded opens. Therefore, there is a need for a technique that can prevent the flange from opening before the fracture portion opens.
　本発明は、フランジのシール部よりも前に破断部が開口する蓋、カップ容器、包装体及び内容物入り包装体を提供することができる。 The present invention can provide a lid, a cup container, a package, and a package with contents in which the break portion opens before the seal portion of the flange.
　本発明の一態様に係る蓋は、カップ容器のフランジに熱融着される蓋であって、二軸延伸により分子配向された外層フィルムと、前記外層フィルムに積層された、前記フランジに熱融着可能な内層フィルムと、前記外層フィルムに形成された１以上の配向緩和部と、前記１以上の配向緩和部が所定の間隔を空けて対向する部位に形成され、電子レンジによる容器内圧の上昇によって破断する破断部と、を備え、前記破断部の開口強度は、前記フランジに熱融着されるシール強度よりも小さい。 A lid according to one aspect of the present invention is a lid that is heat-sealed to a flange of a cup container, and includes an outer layer film that is molecularly oriented by biaxial stretching, and a heat-sealed outer layer film that is laminated to the outer layer film and that is heat-sealed to a flange of a cup container. An inner layer film that can be attached, one or more orientation relaxing portions formed on the outer layer film, and one or more orientation relaxing portions are formed at opposing positions with a predetermined interval, and the internal pressure of the container is increased by a microwave oven. a fractured portion that is fractured by the flange, and the opening strength of the fractured portion is smaller than the sealing strength that is heat-sealed to the flange.
　本発明は、フランジのシール部よりも前に破断部が開口する蓋、カップ容器、包装体及び内容物入り包装体を提供することができる。 The present invention can provide a lid, a cup container, a package, and a package containing contents, in which the rupture portion opens before the seal portion of the flange.
図１は、本発明の第１実施形態に係る包装体としてのカップ容器の構成を示す斜視図である。FIG. 1 is a perspective view showing the configuration of a cup container as a package according to a first embodiment of the present invention. 図２は、同カップ容器に設けられる一対の配向緩和部及び破断部の構成の一例を示す平面図である。FIG. 2 is a plan view showing an example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the cup container. 図３は、同カップ容器に用いられるフィルムの層構成を、図２中ＩＩＩ－ＩＩＩ線断面で示す断面図である。FIG. 3 is a cross-sectional view taken along the line III--III in FIG. 2, showing the layer structure of the film used in the cup container. 図４は、同カップ容器の使用の一例として、電子レンジによって加熱した状態を示す斜視図である。FIG. 4 is a perspective view showing a state in which the cup container is heated in a microwave oven as an example of use. 図５は、同カップ容器に設けられる一つの配向緩和部及び破断部の構成の一例を示す平面図である。FIG. 5 is a plan view showing an example of the structure of one orientation relaxing part and one breaking part provided in the same cup container. 図６は、同カップ容器に設けられる一対の配向緩和部及び破断部の構成の他の一例を示す平面図である。FIG. 6 is a plan view showing another example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the same cup container. 図７は、同カップ容器に設けられる一対の配向緩和部及び破断部の構成の他の一例を示す平面図である。FIG. 7 is a plan view showing another example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the same cup container. 図８は、同カップ容器に設けられる一対の配向緩和部及び破断部の構成の他の一例を示す平面図である。FIG. 8 is a plan view showing another example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the same cup container. 図９は、同カップ容器に設けられる一対の配向緩和部及び破断部の構成の他の一例を示す平面図である。FIG. 9 is a plan view showing another example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the same cup container. 図１０は、同カップ容器に設けられる一対の配向緩和部及び破断部の構成の他の一例を示す平面図である。FIG. 10 is a plan view showing another example of the configuration of a pair of orientation relaxing parts and a breaking part provided in the same cup container. 図１１は、同カップ容器に設けられる三つ以上の配向緩和部及び破断部の構成の他の一例を示す平面図である。FIG. 11 is a plan view showing another example of the configuration of three or more orientation relaxing parts and breaking parts provided in the same cup container. 図１２は、同カップ容器に設けられる三つ以上の配向緩和部及び破断部の構成の他の一例を示す平面図である。FIG. 12 is a plan view showing another example of the configuration of three or more orientation relaxing parts and breaking parts provided in the same cup container. 図１３は、同カップ容器に設けられる三つ以上の配向緩和部及び破断部の構成の他の一例を示す平面図である。FIG. 13 is a plan view showing another example of the configuration of three or more orientation relaxing parts and breaking parts provided in the same cup container. 図１４は、同カップ容器に設けられるシール部の構成の一例を示す平面図である。FIG. 14 is a plan view showing an example of the configuration of a seal section provided in the cup container. 図１５は、同カップ容器に設けられるシール部の構成の他の一例を示す平面図である。FIG. 15 is a plan view showing another example of the configuration of the seal portion provided in the cup container. 図１６は、同カップ容器に設けられるシール部の構成の他の一例を示す平面図である。FIG. 16 is a plan view showing another example of the configuration of the seal section provided in the cup container. 図１７は、同カップ容器に設けられるシール部の構成の他の一例を示す平面図である。FIG. 17 is a plan view showing another example of the configuration of the seal portion provided in the cup container. 図１８は、同カップ容器に設けられるシール部の構成の他の一例を示す平面図である。FIG. 18 is a plan view showing another example of the configuration of the seal portion provided in the cup container. 図１９は、同カップ容器に設けられるシール部の構成の他の一例を示す平面図である。FIG. 19 is a plan view showing another example of the configuration of the seal portion provided in the cup container. 図２０は、本発明の第２実施形態に係る包装体としてのパウチ容器の構成を示す斜視図である。FIG. 20 is a perspective view showing the structure of a pouch container as a package according to a second embodiment of the present invention.
　本発明の第１実施形態に係る蓋１１を用いた包装体１を、図１乃至図１９を用いて説明する。　
　図１は、本発明の実施形態に係る包装体１の構成を示す斜視図、図２は、包装体１に設けられる一対の配向緩和部２１ａ及び破断部１３の構成の一例を示す平面図、図３は、包装体１に用いられる蓋１１の層構成を模式的に示す断面図である。図４は、包装体１の使用の一例として、電子レンジによって加熱した状態を示す斜視図である。 A package 1 using a lid 11 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 19.
FIG. 1 is a perspective view showing the structure of a package 1 according to an embodiment of the present invention, and FIG. 2 is a plan view showing an example of the structure of a pair of orientation relaxation parts 21a and a breaking part 13 provided in the package 1. FIG. 3 is a cross-sectional view schematically showing the layered structure of the lid 11 used in the package 1. As shown in FIG. FIG. 4 is a perspective view showing a state where the package 1 is heated in a microwave oven as an example of use.
　包装体１は、二以上の部材が熱融着（溶着）されることによって構成される、内容物１００を内部に包装する包装容器である。包装体１は、電子レンジで加熱可能に、内容物を収容する電子レンジ加熱用容器である。包装体１は、例えば、カップ容器やパウチ容器である。本実施形態において、包装体１は、二つの部材として、カップ本体及び蓋が熱融着されることで形成されたカップ容器であり、以下、包装体１をカップ容器１として説明する。 The package 1 is a packaging container that is configured by heat-sealing (welding) two or more members and packages the contents 100 inside. The package 1 is a container for heating in a microwave oven that accommodates contents so that it can be heated in a microwave oven. The package 1 is, for example, a cup container or a pouch container. In this embodiment, the package 1 is a cup container formed by heat-sealing a cup body and a lid as two members, and hereinafter, the package 1 will be described as the cup container 1.
　カップ容器１は、内容物１００を内部に充填し、包装する包装容器である。カップ容器１は、電子レンジで加熱可能に、内容物１００を収容する電子レンジ加熱用容器である。図１に示すように、本実施形態において、カップ容器１は、有底筒状のカップ本体１０と、カップ本体１０を密封する蓋１１と、を備える。 The cup container 1 is a packaging container in which the contents 100 are filled and packaged. The cup container 1 is a container for heating in a microwave oven that accommodates a content 100 that can be heated in a microwave oven. As shown in FIG. 1, in this embodiment, the cup container 1 includes a bottomed cylindrical cup body 10 and a lid 11 that seals the cup body 10.
　カップ本体１０は、樹脂材料、紙材料、又は、これらの複合材料により形成される。カップ本体１０は、有底筒状の胴部１０ａと、胴部１０ａの開口の外周縁に形成されるフランジ１０ｂと、を備える。また、カップ本体１０は、胴部１０ａの外周面とフランジ１０ｂの下面とを連続する、複数のリブ１０ｃを備える。 The cup body 10 is formed of a resin material, a paper material, or a composite material thereof. The cup body 10 includes a bottomed cylindrical body 10a and a flange 10b formed at the outer peripheral edge of the opening of the body 10a. The cup body 10 also includes a plurality of ribs 10c that connect the outer peripheral surface of the body 10a and the lower surface of the flange 10b.
　胴部１０ａは、円筒状、矩形筒状、多角形筒状等に形成される。胴部１０ａは、内部に所望量の内容物１００を収容可能な容積に形成される。 The body portion 10a is formed into a cylindrical shape, a rectangular tube shape, a polygonal tube shape, or the like. The body portion 10a is formed to have a volume capable of accommodating a desired amount of contents 100 therein.
　フランジ１０ｂは、カップ本体１０の開口形状に沿って、カップ本体１０の軸線方向に対して直交方向に延びる環状の平板状に形成される。 The flange 10b is formed into an annular flat plate shape extending perpendicularly to the axial direction of the cup body 10 along the opening shape of the cup body 10.
　複数のリブ１０ｃは、胴部１０ａ及びフランジ１０ｂに連続することで、胴部１０ａの開口及びフランジ１０ｂの強度を向上させる。複数のリブ１０ｃは、周方向に等間隔、あるいは非等間隔に配置される。なお、リブ１０ｃの数や形状、間隔は、胴部１０ａの開口及びフランジ１０ｂに求められる強度によって、適宜設定される。 The plurality of ribs 10c improve the strength of the opening of the body 10a and the flange 10b by being continuous with the body 10a and the flange 10b. The plurality of ribs 10c are arranged at equal or non-equal intervals in the circumferential direction. Note that the number, shape, and spacing of the ribs 10c are appropriately set depending on the strength required for the opening of the body portion 10a and the flange 10b.
　蓋１１は、二軸延伸配向フィルム２１を外面側に有する積層構造のフィルムにより形成される。蓋１１は、カップ本体１０のフランジ１０ｂに熱融着することで形成されたシール部３０によって固定される。蓋１１は、固定されたフランジ１０ｂから剥がすときに、摘まむことができるタブ１１ａを有する。また、蓋１１は、カップ容器１の内圧が上昇したときに破断することで蒸気が排出される蒸気口２１ｃを形成する破断部１３を備える。ここで、内容物１００とは、電子レンジにより加熱調理される食品、電子レンジにより加熱されるおしぼり等、電子レンジによって加熱される水分を含有するものである。 The lid 11 is formed of a laminated film having a biaxially stretched oriented film 21 on its outer surface. The lid 11 is fixed by a seal portion 30 formed by heat-sealing to the flange 10b of the cup body 10. The lid 11 has a tab 11a that can be pinched when removed from the fixed flange 10b. The lid 11 also includes a broken portion 13 that forms a steam port 21c through which steam is discharged by breaking when the internal pressure of the cup container 1 increases. Here, the content 100 is something that contains moisture and is heated in a microwave oven, such as food that is heated in a microwave oven or a wet towel that is heated in a microwave oven.
　蓋１１の外形状は、タブ１１ａを除き、フランジ１０ｂの外周縁形状と同形状又はフランジ１０ｂの外周縁形状よりも若干大きい略同形状に形成されるとともに、タブ１１ａが手指で摘まむことが可能に、外方へと突出するように、例えば、略三角形状や半円形状に形成される。 The outer shape of the lid 11, except for the tab 11a, is formed to be the same shape as the outer peripheral edge shape of the flange 10b or approximately the same shape that is slightly larger than the outer peripheral edge shape of the flange 10b, and the tab 11a can be easily pinched with fingers. For example, it may be formed into a substantially triangular or semicircular shape so as to protrude outward.
　蓋１１（蓋１１を構成するフィルム）は、カップ容器１を形成したときのカップ容器１の外面側から、外層フィルムである二軸延伸配向フィルム２１と、接着剤層２２と、内層フィルムであるシーラントフィルム２３と、を備える。また、蓋１１は、二軸延伸配向フィルム２１の外面や、二軸延伸配向フィルム２１及びシーラントフィルム２３の間に、製品等の情報や意匠が施されている印刷層を有していても良い。なお、蓋１１の層構成はこれに限定されず、２層以上であって、少なくとも一層に二軸延伸配向フィルム２１を有する構成であればよい。 The lid 11 (the film constituting the lid 11) includes, from the outer surface side of the cup container 1 when the cup container 1 is formed, a biaxially stretched oriented film 21 which is an outer layer film, an adhesive layer 22, and an inner layer film. A sealant film 23 is provided. Further, the lid 11 may have a printed layer on the outer surface of the biaxially stretched oriented film 21 or between the biaxially stretched oriented film 21 and the sealant film 23, on which product information or designs are applied. . Note that the layer structure of the lid 11 is not limited to this, and may be any structure as long as it has two or more layers and includes the biaxially stretched oriented film 21 in at least one layer.
　二軸延伸配向フィルム２１は、一部を融点近傍の所定温度以上に加熱することで形成された配向緩和部２１ａを含む。配向緩和部２１ａは、破断部１３の一部を構成する。配向緩和部２１ａは、破断部１３の構成によって種々の形状に構成される。 The biaxially stretched oriented film 21 includes an orientation relaxing portion 21a formed by heating a portion to a predetermined temperature or higher near the melting point. The orientation relaxing portion 21 a constitutes a part of the fracture portion 13 . The orientation relaxing portion 21a is configured in various shapes depending on the configuration of the fracture portion 13.
　二軸延伸配向フィルム２１は、結晶性延伸配向フィルムである。二軸延伸配向フィルム２１は、例えば、二軸延伸ＰＥＴフィルム、二軸延伸ナイロンフィルム、二軸延伸ＰＰフィルム等の汎用二軸延伸フィルムまたは、これらの複合フィルムにより構成される。また、その他好適な例としては、二軸延伸配向フィルム２１は、二軸延伸ＰＶＡフィルム、二軸延伸ＥＶＯＨフィルム等のバリア性を有する二軸延伸フィルムや、ＰＰ／ＥＶＯＨ／ＰＰ、ＮＹ／ＥＶＯＨ／ＮＹ、ＮＹ／ＭＸＤ－ＮＹ／ＮＹ等のバリア性樹脂を中間層に有する共押出二軸延伸フィルムが挙げられる。また、汎用二軸延伸フィルムにＰＶＡ系、ＰＶＤＣ、ＰＡＡ系のバリア性樹脂をコートしたフィルム、あるいは前述のバリア性樹脂に無機物が分散したハイブリットコートフィルムも二軸延伸配向フィルム２１に好適に使用できる。二軸延伸配向フィルム２１の厚さは、１２μｍ以上５０μｍ以下が好適である。 The biaxially stretched oriented film 21 is a crystalline stretched oriented film. The biaxially stretched oriented film 21 is constituted by, for example, a general-purpose biaxially stretched film such as a biaxially stretched PET film, a biaxially stretched nylon film, a biaxially stretched PP film, or a composite film thereof. In addition, as other suitable examples, the biaxially stretched oriented film 21 is a biaxially stretched film having barrier properties such as a biaxially stretched PVA film, a biaxially stretched EVOH film, PP/EVOH/PP, NY/EVOH/ Examples include coextruded biaxially stretched films having a barrier resin such as NY, NY/MXD-NY/NY in the intermediate layer. Furthermore, a film obtained by coating a general-purpose biaxially stretched film with a PVA-based, PVDC, or PAA-based barrier resin, or a hybrid coated film in which an inorganic substance is dispersed in the above-mentioned barrier resin can also be suitably used as the biaxially stretched oriented film 21. . The thickness of the biaxially stretched oriented film 21 is preferably 12 μm or more and 50 μm or less.
　これは、二軸延伸配向フィルム２１の厚さを１２μｍ未満とすると、カップ容器１の物理的強度が低下する虞があり、また、成膜技術的に難しく、コストアップとなるためである。また、二軸延伸配向フィルム２１の厚さが５０μｍを超えると、二軸延伸配向フィルム２１を含む蓋１１が伸長しにくくなるためである。但し、配向緩和部２１ａの形状等によって破断部１３が破断する構成であれば、二軸延伸配向フィルム２１の厚さは、限定されない。 This is because if the thickness of the biaxially stretched oriented film 21 is less than 12 μm, there is a risk that the physical strength of the cup container 1 will decrease, and the film forming technique will be difficult, leading to an increase in cost. Further, if the thickness of the biaxially stretched oriented film 21 exceeds 50 μm, it becomes difficult for the lid 11 including the biaxially stretched oriented film 21 to stretch. However, the thickness of the biaxially stretched oriented film 21 is not limited as long as the breaking portion 13 is broken depending on the shape of the orientation relaxing portion 21a or the like.
　配向緩和部２１ａは、二軸延伸配向フィルム２１を融点近傍の所定温度以上に加熱し、配向を緩和させるか、又は、配向を消失させることで形成される。即ち、蓋１１の二軸延伸配向フィルム２１は、融点近傍の所定温度以上に加熱されていない配向を有する配向部２１ｂの一部に、融点近傍の所定温度以上に加熱された配向緩和部２１ａを有する。なお、融点近傍の所定温度とは、二軸延伸配向フィルム２１によって異なるが、少なくとも、配向を緩和し、配向緩和部２１ａ及び配向部２１ｂの引張弾性率及び破断伸度等を所望の関係とできる温度である。 The orientation relaxing portion 21a is formed by heating the biaxially stretched oriented film 21 to a predetermined temperature or higher near the melting point to relax the orientation or eliminate the orientation. That is, the biaxially stretched oriented film 21 of the lid 11 has an orientation relaxing portion 21a heated to a predetermined temperature near the melting point or higher in a part of the oriented portion 21b having an orientation that has not been heated above a predetermined temperature near the melting point. have Note that the predetermined temperature near the melting point differs depending on the biaxially stretched oriented film 21, but at least the orientation can be relaxed and the tensile elastic modulus, elongation at break, etc. of the orientation relaxed part 21a and the oriented part 21b can have a desired relationship. It's temperature.
　ここで、蓋１１の分子配向部における引張弾性率をＥ１、分子配向緩和部における引張弾性率をＥ２としたときに、配向部２１ｂの引張弾性率Ｅ１と、配向緩和部２１ａの引張弾性率Ｅ２との関係は、例えば、０＜Ｅ２／Ｅ１＜０．５である。蓋１１の分子配向部とは、二軸延伸配向フィルム２１、接着剤層２２及びシーラントフィルム２３を有する蓋１１のうち、二軸延伸配向フィルム２１の配向部２１ｂが存する部位であり、蓋１１の分子配向緩和部とは、蓋１１のうち、二軸延伸配向フィルム２１の配向緩和部２１ａが存する部位である。 Here, when the tensile elastic modulus in the molecular orientation part of the lid 11 is E1, and the tensile elastic modulus in the molecular orientation relaxing part is E2, the tensile elastic modulus E1 of the oriented part 21b and the tensile elastic modulus E2 of the orientation relaxing part 21a. The relationship is, for example, 0<E2/E1<0.5. The molecularly oriented portion of the lid 11 is a portion of the lid 11 having the biaxially oriented oriented film 21, the adhesive layer 22, and the sealant film 23, where the oriented portion 21b of the biaxially oriented film 21 exists; The molecular orientation relaxing portion is a portion of the lid 11 where the orientation relaxing portion 21a of the biaxially stretched oriented film 21 exists.
　例えば、本実施形態の二軸延伸配向フィルム２１が二軸延伸ＰＥＴフィルムの場合、蓋１１の分子配向部の引張弾性率Ｅ１はおよそ２０００ＭＰａであり、分子配向緩和部の引張弾性率Ｅ２はおよそ２００ＭＰａである。この場合、Ｅ２／Ｅ１は約０．１となり、０．５未満の値となる。 For example, when the biaxially stretched oriented film 21 of this embodiment is a biaxially stretched PET film, the tensile modulus E1 of the molecularly oriented portion of the lid 11 is approximately 2000 MPa, and the tensile modulus E2 of the molecularly oriented relaxed portion is approximately 200 MPa. It is. In this case, E2/E1 is approximately 0.1, which is less than 0.5.
　なお、二軸延伸配向フィルム２１に配向緩和部２１ａを形成するための二軸延伸配向フィルム２１の加熱方法は、レーザー光加熱、熱板加熱、インパルス加熱、近赤外線加熱等の方法を用いることが好ましい。 In addition, as a heating method for the biaxially stretched oriented film 21 to form the orientation relaxed portion 21a in the biaxially stretched oriented film 21, methods such as laser beam heating, hot plate heating, impulse heating, and near-infrared heating may be used. preferable.
　例えば、レーザー光加熱、近赤外線加熱は、非接触で二軸延伸配向フィルム２１を加熱できる利点があるが、局所的に加熱が可能であることからレーザー光加熱が好ましい。また、使用する二軸延伸配向フィルム２１のレーザー光の吸収性が乏しく、配向緩和部２１aの形成が困難である場合、二軸延伸配向フィルム２１にレーザー光の吸収性を向上させるレーザー光吸収材を事前に延伸配向フィルム２１の材料にブレンドしても良く、あるいは二軸延伸配向フィルム２１にレーザー光吸収材をコートしても良い。 For example, laser beam heating and near-infrared heating have the advantage of being able to heat the biaxially stretched oriented film 21 without contact, but laser beam heating is preferable because local heating is possible. In addition, if the biaxially stretched oriented film 21 to be used has poor laser light absorbability and it is difficult to form the orientation relaxation part 21a, a laser light absorbing material that improves the laser light absorbability is added to the biaxially stretched oriented film 21. may be blended in advance with the material of the stretched oriented film 21, or the biaxially stretched oriented film 21 may be coated with a laser light absorbing material.
　また、レーザー光の種類としては、二軸延伸配向フィルム２１に使用される樹脂素材の多くが比較的吸収性が高い炭酸ガスレーザーを用いることが好ましい。レーザー光吸収材としてはレーザー光の種類によって適宜選択することができる。これらの加熱方法は、使用する二軸延伸配向フィルム２１の材質等によって適宜選択できる。 Furthermore, as for the type of laser beam, it is preferable to use a carbon dioxide laser, since most of the resin materials used for the biaxially stretched oriented film 21 have relatively high absorbency. The laser light absorbing material can be appropriately selected depending on the type of laser light. These heating methods can be appropriately selected depending on the material of the biaxially stretched oriented film 21 to be used.
　熱板加熱やインパルス加熱は、押さえヘッド部に溶融した二軸延伸配向フィルム２１の樹脂やシーラントフィルム２３の樹脂の一部が付かないようテフロン（登録商標）表面処理等の処理を押えヘッド部に行うことが好ましい。例えば、熱板加熱であれば、二軸延伸配向フィルム２１の融点近傍の所定温度以上で温度設定され加熱された押さえヘッド（熱板）を二軸延伸配向フィルム２１に押し当てて溶融加熱することにより、配向緩和部２１ａを形成する。 In hot plate heating or impulse heating, a treatment such as Teflon (registered trademark) surface treatment is applied to the presser head so that the resin of the molten biaxially stretched oriented film 21 and the resin of the sealant film 23 do not stick to the presser head. It is preferable to do so. For example, in the case of hot plate heating, a pressing head (hot plate) heated and set at a temperature higher than a predetermined temperature near the melting point of the biaxially stretched oriented film 21 is pressed against the biaxially stretched oriented film 21 to melt and heat it. Thus, the orientation relaxing portion 21a is formed.
　また、形成した配向緩和部２１ａが適正に形成されているか否かについては、形成した二軸延伸配向フィルム２１を検査することで判断できる。この検査方法としては、Ｘ線回折、ＦＴ－ＩＲ（フーリエ変換赤外分光法）、ＤＳＣ（示差走査熱量測定）等による結晶化度測定、偏光板を使用した配向ビュワー等を用いることができる。 Furthermore, whether or not the formed orientation relaxing portion 21a is properly formed can be determined by inspecting the formed biaxially stretched oriented film 21. As this inspection method, crystallinity measurement using X-ray diffraction, FT-IR (Fourier transform infrared spectroscopy), DSC (differential scanning calorimetry), orientation viewer using a polarizing plate, etc. can be used.
　このような二軸延伸配向フィルム２１は、例えば、配向部２１ｂの破断伸度が２００％以下に設定され、配向緩和部２１ａの破断伸度が３００％以上に設定される。 In such a biaxially stretched oriented film 21, for example, the elongation at break of the oriented portion 21b is set to 200% or less, and the elongation at break of the orientation relaxed portion 21a is set to 300% or more.
　接着剤層２２は、一般的な食品用途のドライラミ用接着剤から適宜選択して使用できる。ただし、カップ容器１は、電子レンジ加熱に用いるため、接着剤層２２は、耐熱性を有するものが好適である。接着剤層２２の厚さは、２μｍ～５μｍが性能的、経済的観点より好ましい。 The adhesive layer 22 can be appropriately selected from adhesives for dry lamination for general food use. However, since the cup container 1 is used for heating in a microwave oven, it is preferable that the adhesive layer 22 has heat resistance. The thickness of the adhesive layer 22 is preferably 2 μm to 5 μm from the viewpoint of performance and economy.
　シーラントフィルム２３は、例えば、未延伸低密度ポリエチレン（ＬＤＰＥ）フィルム、未延伸直鎖状低密度ポリエチレン（ＬＬＤＰＥ）フィルム、未延伸ポリプロピレン（ＰＰ）フィルム、未延伸ポリエチレンテレフタレートフィルム等により構成される。シーラントフィルム２３の厚さは、１０μｍ以上１００μｍ以下が好適である。なお、シーラントフィルム２３の厚さは、２０μｍ以上６０μｍ以下がより好ましい。 The sealant film 23 is composed of, for example, an unstretched low-density polyethylene (LDPE) film, an unstretched linear low-density polyethylene (LLDPE) film, an unstretched polypropylene (PP) film, an unstretched polyethylene terephthalate film, or the like. The thickness of the sealant film 23 is preferably 10 μm or more and 100 μm or less. Note that the thickness of the sealant film 23 is more preferably 20 μm or more and 60 μm or less.
　これは、シーラントフィルム２３の厚さが１０μｍ未満では包装体１の実用的な強度が不足する虞があり、輸送時の振動や落下の衝撃でシール部３０が破断し易くなる虞があるためである。また、シーラントフィルム２３の厚さが１００μｍを超えると、伸長しにくくなるため、蒸気抜きに対する確実性の問題が生じる虞があるためである。 This is because if the thickness of the sealant film 23 is less than 10 μm, the practical strength of the package 1 may be insufficient, and the seal portion 30 may easily break due to vibration during transportation or impact from dropping. be. In addition, if the thickness of the sealant film 23 exceeds 100 μm, it becomes difficult to stretch, which may cause a problem in reliability with respect to steam release.
　破断部１３は、対向する配向緩和部２１ａの間に配置される配向部２１ｂにより形成される。即ち、破断部１３は、蓋１１の一部に設けられ、直線又は曲線等の線状に延び、自身の二箇所が所定の間隔を開けて対向する形状の単数の配向緩和部２１ａが配置されるか又は複数の配向緩和部２１ａが対向して配置されることで、配向緩和部２１ａの間に存する配向部２１ｂによって構成される。即ち、破断部１３は、二軸延伸配向フィルム２１の融点近傍の所定温度以上に加熱されていない配向部２１ｂ、換言すると配向を有する二軸延伸配向フィルム２１の配向部２１ｂを介在して配向緩和部２１ａの一部が対向することで構成される。 The fracture portion 13 is formed by the orientation portion 21b arranged between the opposing orientation relaxation portions 21a. That is, the broken part 13 is provided in a part of the lid 11, and has a single orientation relaxing part 21a extending in a linear shape such as a straight line or a curved line, and having two parts facing each other with a predetermined interval. By arranging one or more orientation relaxing parts 21a to face each other, the orientation part 21b is formed between the orientation relaxing parts 21a. That is, the fractured part 13 is the oriented part 21b that is not heated above a predetermined temperature near the melting point of the biaxially stretched oriented film 21, in other words, the oriented part 21b of the biaxially stretched oriented film 21 that has an orientation is interposed and the orientation is relaxed. It is constructed by partially opposing the portions 21a.
　具体例として、図２、図５乃至図１３に示すように、配向緩和部２１ａは、短辺及び長辺を有し、一以上設けられる。配向緩和部２１ａが一つ設けられるときは、図５に示すように、配向緩和部２１ａは、自身の短辺同士が所定の間隔を開けて対向するか、又は、自身の短辺及び長辺が所定の間隔を開けて対向する。 As a specific example, as shown in FIGS. 2, 5 to 13, one or more orientation relaxing portions 21a are provided, each having a short side and a long side. When one orientation relaxation part 21a is provided, as shown in FIG. face each other at a predetermined distance.
　配向緩和部２１ａが二つ設けられるときは、二つの配向緩和部２１ａは、図２、図６乃至図８に示すように、それぞれの短辺同士が所定の間隔を開けて対向するか、又は、図９及び図１０に示すように、一方の配向緩和部２１ａの短辺及び他方の配向緩和部２１ａの長辺が所定の間隔を開けて対向する。同様に、配向緩和部２１ａが三つ以上設けられるときは、図１１乃至図１３に示すように、いずれか二つの配向緩和部２１ａ又は三以上の配向緩和部２１ａは、短辺同士又は短辺及び長辺が所定の間隔を開けて対向する。なお、複数の配向緩和部２１ａを破断部１３に設ける場合には、図２に示すように、配向緩和部２１ａをサイズ及び形状を同じとすることが好ましいが、破断部１３が破断する構成であれば、図１３に示すように、異なるサイズ及び形状であってもよい。 When two orientation relaxation portions 21a are provided, the two orientation relaxation portions 21a may face each other with their short sides separated by a predetermined distance, as shown in FIGS. 2 and 6 to 8, or , 9 and 10, the short side of one orientation relaxing part 21a and the long side of the other orientation relaxing part 21a face each other with a predetermined interval. Similarly, when three or more orientation relaxing parts 21a are provided, as shown in FIGS. and the long sides thereof face each other with a predetermined interval. Note that when a plurality of orientation relaxation parts 21a are provided in the fracture part 13, it is preferable that the orientation relaxation parts 21a have the same size and shape as shown in FIG. If so, they may be of different sizes and shapes, as shown in FIG.
　より具体的には、破断部１３は、二軸延伸配向フィルム２１が加熱された一以上の配向緩和部２１ａが、二軸延伸配向フィルム２１の配向を有する配向部２１ｂを挟んで所定の距離だけ間隔を開けて近接することで構成される。ここで、所定の距離とは、電子レンジ加熱時に破断部１３が破断して蒸気口２１ｃを形成できる距離であれば、適宜設定可能であるが、好ましくは５ｍｍ未満である。また、長辺及び短辺は、直線状に限らず、曲線状であってもよい。即ち、破断部１３は、配向緩和部２１ａがいずれかの方向に延びる形状に構成され、一の配向緩和部２１ａの一つの端部が、同配向緩和部２１ａの他の部位又は他の配向緩和部２１ａの一部と所定の間隔を開けて対向すればよい。なお、破断部１３が破断して蒸気口２１ｃを形成できるのであれば、対向する配向緩和部２１ａに挟まれた配向部２１ｂの一部が配向緩和されていても良い。 More specifically, the fracture portion 13 is formed by one or more orientation relaxing portions 21a where the biaxially stretched oriented film 21 is heated by a predetermined distance across the oriented portion 21b having the orientation of the biaxially stretched oriented film 21. It consists of being placed close to each other with a distance between them. Here, the predetermined distance can be set as appropriate as long as it is a distance that allows the fracture portion 13 to fracture and form the steam port 21c during microwave heating, but is preferably less than 5 mm. Further, the long side and the short side are not limited to straight lines, but may be curved lines. That is, the fractured part 13 is configured in such a shape that the orientation relaxing part 21a extends in either direction, and one end of one orientation relaxing part 21a is connected to another part of the same orientation relaxing part 21a or another orientation relaxing part 21a. It is sufficient to face a part of the portion 21a with a predetermined distance therebetween. Note that, as long as the fracture portion 13 can be fractured to form the steam port 21c, a portion of the orientation portion 21b sandwiched between the opposing orientation relaxation portions 21a may be relaxed.
　また、一つの配向緩和部２１ａは、形状としては、図５に示すように、一部が切欠する円環状や多角環状等が考えられる。二つの配向緩和部２１ａは、例えば、図２、図６及び図７に示すように、直線状に構成され、互いに短辺同士が直線状に又は所定の角度で交差する様に対向する構成や、図９及び図１０に示すように、Ｔ字状に短辺と長辺が対向する構成が考えられる。また、二つの配向緩和部２１ａは、直線状以外にも、図８に示すように、波状等の構成が考えられる。また、三つ以上の配向緩和部２１ａとしては、図１２及び図１３に示すように、一方向に長手方向が沿って並ぶ構成や、図１１に示すように、破断部１３を中心として、周方向に並ぶ構成が考えられる。 Further, the shape of one orientation relaxing portion 21a may be a partially cut-out circular ring shape, a polygonal ring shape, or the like, as shown in FIG. For example, as shown in FIG. 2, FIG. 6, and FIG. 7, the two orientation relaxation portions 21a may be configured to be linear and face each other so that their short sides intersect with each other in a straight line or at a predetermined angle. As shown in FIGS. 9 and 10, a T-shaped structure in which the short sides and long sides are opposite to each other can be considered. In addition, the two orientation relaxing portions 21a may have a wave-like configuration, as shown in FIG. 8, in addition to the linear configuration. Furthermore, as the three or more orientation relaxing parts 21a, as shown in FIGS. 12 and 13, the longitudinal direction may be arranged in one direction, or as shown in FIG. A configuration in which they are lined up in the direction is conceivable.
　なお、配向緩和部２１ａは、製造コスト等を考慮すると、図２に示すように、一方向に長い矩形状に形成されるとともに一対設けられ、短辺同士が対向する構成が好ましい。また、図２に示す配向緩和部２１ａは、短辺の長さを０．５～１０ｍｍ、長辺の長さを３～１００ｍｍの範囲とし、且つ、短辺の長さは長辺の長さよりも短い範囲に設定することが好ましく、カップ容器１のサイズや蓋１１の構成によって適宜選択する。また、二つの配向緩和部２１ａの対向する短辺間の距離は、５ｍｍ未満に設定され、さらにいえば０．５～３．０ｍｍに設定することがより好ましく、カップ容器１のサイズや蓋１１の構成によって適宜選択する。 Note that, in consideration of manufacturing costs and the like, it is preferable that the orientation relaxing portions 21a be formed in a rectangular shape long in one direction and provided in pairs, with the short sides facing each other, as shown in FIG. In addition, the orientation relaxation part 21a shown in FIG. 2 has a short side length in the range of 0.5 to 10 mm, a long side length in the range of 3 to 100 mm, and the length of the short side is longer than the length of the long side. is preferably set to a short range, and is appropriately selected depending on the size of the cup container 1 and the configuration of the lid 11. Further, the distance between the opposing short sides of the two orientation relaxation parts 21a is set to less than 5 mm, more preferably set to 0.5 to 3.0 mm, depending on the size of the cup container 1 and the lid 11. Select as appropriate depending on the configuration.
　これは、配向緩和部２１ａの寸法が当該範囲未満では伸長する範囲が狭すぎて蒸気抜きがうまく発動できない虞があり、当該範囲を超えると蓋１１の強度の低下やガスバリア性低下の影響が大きくなる虞があるためである。また、二つの配向緩和部２１ａの対向する短辺間の距離は、当該範囲未満では対向する配向緩和部２１ａの先端同士が一体化してしまい蒸気口２１ｃを形成できずに破裂してしまう虞があり、また、当該範囲を超えると二つの配向緩和部２１ａの対向する短辺間の領域が伸長できなくなるため、破断部１３が破断せずに、カップ容器１が蒸気口２１ｃを形成できずに破裂してしまう虞があるためである。 This is because if the dimension of the orientation relaxation part 21a is less than this range, the range in which it expands is too narrow and steam release may not be effective.If it exceeds this range, the strength of the lid 11 will be reduced and the gas barrier properties will be significantly affected. This is because there is a possibility that Furthermore, if the distance between the opposing short sides of the two orientation relaxation parts 21a is less than this range, there is a risk that the tips of the opposing orientation relaxation parts 21a will become integrated and burst without being able to form the steam port 21c. Moreover, if the range is exceeded, the region between the opposing short sides of the two orientation relaxation parts 21a will not be able to expand, so the breakage part 13 will not break and the cup container 1 will not be able to form the steam port 21c. This is because there is a risk of it bursting.
　蓋１１をフランジ１０ｂに熱融着することで形成されるシール部３０は、フランジ１０ｂに沿って環状に形成されるとともに、フランジ１０ｂの幅、円環状のフランジ１０ｂの場合には、フランジ１０ｂの径方向の幅よりも小さい幅に設定される。また、シール部３０は、フランジ１０ｂの外周縁よりも内方向、より具体例としては、フランジ１０ｂの内周縁側に設けられる。シール部３０による蓋１１のフランジ１０ｂへのシール強度は、破断部１３がカップ容器１の容器内圧の上昇によって破断する開口強度よりも高い。ここで、シール強度及び開口強度は、例えば、内圧が上昇して蓋１１が膨張したとき、即ち、電子レンジによって内容物が加熱した、加熱後の強度である。 The seal portion 30, which is formed by heat-sealing the lid 11 to the flange 10b, is formed in an annular shape along the flange 10b. The width is set smaller than the radial width. Further, the seal portion 30 is provided inward from the outer peripheral edge of the flange 10b, more specifically, on the inner peripheral edge side of the flange 10b. The sealing strength of the seal portion 30 to the flange 10b of the lid 11 is higher than the opening strength of the rupture portion 13 at which the rupture portion 13 ruptures due to an increase in the internal pressure of the cup container 1. Here, the sealing strength and the opening strength are, for example, the strength after heating when the internal pressure increases and the lid 11 expands, that is, when the contents are heated in a microwave oven.
　また、例えば、シール部３０は、シール部３０の延び方向に直交する方向である幅方向、本実施のように円環状に形成される場合には、径方向の幅が狭い複数の幅狭部３１及び径方向の幅が広い複数の幅広部３２を少なくとも一部に有する。例えば、複数の幅狭部３１及び複数の幅広部３２は、少なくともタブ１１ａと幅方向（径方向）で対向する位置に設けられる。換言すると、シール部３０は、環状に形成されるとともに、内周縁がフランジ１０ｂに沿った形状、例えば円形状に形成され、外周縁が、少なくとも一部に、周方向に間隔を空けて間欠的に凸状に突出することで複数の幅狭部３１及び複数の幅広部３２が形成される。 For example, if the seal portion 30 is formed in an annular shape in the width direction, which is a direction perpendicular to the extending direction of the seal portion 30, as in this embodiment, the seal portion 30 may include a plurality of narrow portions having a narrow width in the radial direction. 31 and a plurality of wide portions 32 that are wide in the radial direction at least in part. For example, the plurality of narrow width portions 31 and the plurality of wide width portions 32 are provided at positions facing at least the tab 11a in the width direction (radial direction). In other words, the seal portion 30 is formed in an annular shape, the inner peripheral edge is formed in a shape along the flange 10b, for example, a circular shape, and the outer peripheral edge is formed intermittently at intervals in the circumferential direction. By protruding in a convex shape, a plurality of narrow width portions 31 and a plurality of wide width portions 32 are formed.
　具体例として、図２に示すように、シール部３０は、周方向の全ての領域において、等間隔に複数の幅狭部３１及び複数の幅広部３２が交互に設けられ、このうち、少なくとも一部の複数の幅狭部３１及び複数の幅広部３２がタブ１１ａと幅方向で対向する。 As a specific example, as shown in FIG. 2, the seal portion 30 includes a plurality of narrow width portions 31 and a plurality of wide width portions 32 alternately provided at equal intervals in all regions in the circumferential direction. A plurality of narrow portions 31 and a plurality of wide portions 32 of the portion face the tab 11a in the width direction.
　複数の幅狭部３１及び複数の幅広部３２の幅は、それぞれ、フランジ１０ｂの幅よりも小さい。幅狭部３１は、一定の幅に形成される。幅広部３２は、径方向外方に向かって突出するとともに、径方向外方に向かって漸次、径方向に直交する方向の幅が狭くなる形状、例えば、図２及び図１４に示す半円状又は図１５及び図１６に示す三角形状に形成される。 The widths of the plurality of narrow parts 31 and the plurality of wide parts 32 are each smaller than the width of the flange 10b. The narrow portion 31 is formed to have a constant width. The wide portion 32 has a shape that projects outward in the radial direction and gradually narrows in width in a direction perpendicular to the radial direction, for example, a semicircular shape shown in FIGS. 2 and 14. Alternatively, it is formed into a triangular shape as shown in FIGS. 15 and 16.
　なお、幅広部３２は、例えば、図１７及び図１８に示すように、径方向に直交する方向の幅が一定となるように、径方向外方に向かって延びる矩形状等であってもよい。なお、シール部３０は、図１９に示すように、幅広部３２を有さず、同一幅の環状の幅狭部３１によって形成される構成であってもよい。 Note that the wide portion 32 may have a rectangular shape that extends outward in the radial direction so that the width in the direction perpendicular to the radial direction is constant, as shown in FIGS. 17 and 18, for example. . Note that, as shown in FIG. 19, the seal portion 30 may have a configuration in which it does not have the wide portion 32 and is formed by an annular narrow portion 31 having the same width.
　次に、このようなカップ容器１の製造方法について説明する。　
　先ず、蓋１１を構成するフィルムの一部を二軸延伸配向フィルム２１の融点近傍の所定温度以上に加熱し、二軸延伸配向フィルム２１の一部の配向を消失させて、所定の形状の配向緩和部２１ａを形成する。具体例として、二軸延伸配向フィルム２１を融点近傍の所定温度以上とする出力で炭酸ガスレーザー等のレーザー光を蓋１１の一部に照射する。 Next, a method for manufacturing such a cup container 1 will be explained.
First, a part of the film constituting the lid 11 is heated to a temperature higher than a predetermined temperature near the melting point of the biaxially stretched oriented film 21 to eliminate the orientation of the part of the biaxially stretched oriented film 21, so that the film is oriented in a predetermined shape. A relaxing portion 21a is formed. As a specific example, a part of the lid 11 is irradiated with a laser beam such as a carbon dioxide gas laser with an output that raises the biaxially stretched oriented film 21 to a predetermined temperature or higher near the melting point.
　次いで、形成する配向緩和部２１ａの形状にレーザー光を走査する。例えば、一対の配向緩和部２１ａを形成する場合には、一方の配向緩和部２１ａの形状にレーザー光を走査その後、レーザー光の照射を停止し、他方の配向緩和部２１ａを形成する位置に再びレーザー光を照射する。次いで、他方の配向緩和部２１ａの形状にレーザー光を走査する。なお、このとき、配向緩和部２１ａは、配向が緩和されていれば良く、配向がなくなる無配向となるまでレーザー光を照射する必要はないが、無配向としてもよい。これらの工程によって、蓋１１の一部を加熱して、配向緩和部２１ａを形成する。これにより、一部に破断部１３が形成された蓋１１が製造される。なお、破断部１３の形成は、フィルムを蓋１１の形状に切断した後であっても良く、また、フィルムを蓋１１の形状に切断する前であってもよい。 Next, a laser beam is scanned over the shape of the orientation relaxing portion 21a to be formed. For example, when forming a pair of orientation relaxation parts 21a, a laser beam is scanned over the shape of one orientation relaxation part 21a, and then the laser light irradiation is stopped and the position where the other orientation relaxation part 21a is to be formed is again moved. Irradiates laser light. Next, the shape of the other orientation relaxing portion 21a is scanned with a laser beam. Note that at this time, the orientation-relaxed portion 21a only needs to have its orientation relaxed, and it is not necessary to irradiate the laser beam until the orientation disappears or becomes non-orientated, but the orientation-relaxed portion 21a may be non-oriented. Through these steps, a portion of the lid 11 is heated to form the orientation relaxing portion 21a. As a result, the lid 11 in which the broken portion 13 is formed in a portion is manufactured. Note that the breaking portion 13 may be formed after the film is cut into the shape of the lid 11, or may be formed before the film is cut into the shape of the lid 11.
　次に、カップ本体１０に所定の量の内容物１００を充填する。次いで、フランジ１０ｂ上に蓋１１を配置し、蓋１１をフランジ１０ｂにヒートシールし、シール部３０を形成することで、内容物が収容され、密封されたカップ容器１（内容物入りカップ容器）が製造される。ヒートシールは、例えば、シール部３０の形状に形成された熱融着用の型を蓋１１に押し当てることで行われる。 Next, the cup body 10 is filled with a predetermined amount of contents 100. Next, the lid 11 is placed on the flange 10b, and the lid 11 is heat-sealed to the flange 10b to form the sealing part 30, so that the contents are contained and the sealed cup container 1 (cup container with contents) is formed. Manufactured. Heat sealing is performed, for example, by pressing a heat sealing mold formed in the shape of the seal portion 30 against the lid 11.
　次に、このようなカップ容器１の使用方法について説明する。　
　内容物が収容されたカップ容器１は電子レンジに配置され、次いで電子レンジにより内容物が加熱される。電子レンジにより内容物を加熱すると、内容物から水蒸気が生じ、内圧が上昇してカップ容器１が膨張して蓋１１が伸長する。蓋１１が伸長すると、配向緩和部２１ａの対向する短辺間か、又は、対向する短辺及び長辺間の破断部１３が破断し、カップ容器１の蒸気が外部に逃げて、内圧が減少し、蒸気抜きが行われる。なお、内容物から生じる蒸気は、アルコール蒸気が含まれていても良い。 Next, a method of using such a cup container 1 will be explained.
The cup container 1 containing the contents is placed in a microwave oven, and then the contents are heated by the microwave oven. When the contents are heated in a microwave oven, water vapor is generated from the contents, the internal pressure increases, the cup container 1 expands, and the lid 11 extends. When the lid 11 expands, the fracture portion 13 between the opposing short sides of the orientation relaxing portion 21a or between the opposing short and long sides breaks, and the steam in the cup container 1 escapes to the outside, reducing the internal pressure. Then, steam is vented. Note that the vapor generated from the contents may contain alcohol vapor.
　破断部１３が破断し、カップ容器１から蒸気が排出される機能について具体的に説明する。水分を含有する内容物を包装したカップ容器１を電子レンジで加熱すると、内容物から水蒸気が発生し、内圧が上昇し、結果、カップ容器１が膨張する。このときシーラントフィルム２３に使用するＬＤＰＥ、ＬＬＤＰＥ、ＣＰＰ等は通常無延伸、即ち無配向であるため、延伸フィルムよりも引張強度は低く、また破断伸度の数値も高い。一方で二軸延伸配向フィルム２１は、通常引張強度が高く、また破断伸度の数値も低いため、二軸延伸配向フィルム２１及びシーラントフィルム２３を貼りあわせた蓋１１は伸長しにくい。 The function of the breaking portion 13 breaking and steam being discharged from the cup container 1 will be specifically explained. When the cup container 1 packed with contents containing moisture is heated in a microwave oven, water vapor is generated from the contents, internal pressure increases, and as a result, the cup container 1 expands. At this time, the LDPE, LLDPE, CPP, etc. used for the sealant film 23 are usually unstretched, that is, unoriented, and therefore have a lower tensile strength and a higher elongation at break than a stretched film. On the other hand, the biaxially stretched oriented film 21 usually has a high tensile strength and a low breaking elongation value, so the lid 11 with the biaxially stretched oriented film 21 and the sealant film 23 bonded together is difficult to stretch.
　しかし、二軸延伸配向フィルム２１の配向緩和部２１ａは、二軸延伸配向フィルム２１の配向が緩和された、あるいは無配向の状態となっている領域であるため、二軸延伸配向フィルム２１の配向部２１ｂである配向領域と比較して、引張強度は低い。また、蓋１１は、分子配向緩和部の引張弾性率Ｅ２が分子配向部の引張弾性率Ｅ１よりも低い。そして、内圧が上昇してカップ容器１が膨張し、蓋１１が伸長すると、配向緩和部２１ａの領域の蓋１１が応力集中により幅方向に伸長する。 However, since the orientation relaxed portion 21a of the biaxially stretched oriented film 21 is a region where the orientation of the biaxially stretched oriented film 21 is relaxed or is in a non-oriented state, the orientation of the biaxially stretched oriented film 21 is The tensile strength is lower than that of the oriented region which is part 21b. Further, in the lid 11, the tensile elastic modulus E2 of the molecular orientation relaxing portion is lower than the tensile elastic modulus E1 of the molecular orientation portion. Then, when the internal pressure increases and the cup container 1 expands and the lid 11 expands, the lid 11 in the region of the orientation relaxation part 21a expands in the width direction due to stress concentration.
　このとき配向緩和部２１ａの対向する短辺間又は対向する短辺及び長辺間に位置する配向部２１ｂの領域の蓋１１も配向緩和部２１ａの領域の伸長に追従して伸長するが、配向緩和部２１ａの領域の方が破断伸度の数値が高く、引張弾性率が低い。また、シール部３０のシール強度は、破断部１３の開口強度よりも高い。結果、配向緩和部２１ａ及び配向部２１ｂの破断伸度差及び引張弾性率差により、蓋１１がある程度伸長したときに、配向緩和部２１ａの対向する短辺間又は対向する短辺及び長辺間に位置する配向部２１ｂを含む領域である破断部１３が、蓋１１の他の箇所よりも先に破断し、水蒸気を排出する小孔が生じる。この小孔を蒸気口２１ｃとしてカップ容器１から蒸気が排出される。 At this time, the lid 11 of the region of the orientation section 21b located between the opposing short sides of the orientation relaxation section 21a or between the opposing short and long sides also expands following the expansion of the region of the orientation relaxation section 21a. The region of the relaxing portion 21a has a higher elongation at break and a lower tensile modulus. Further, the seal strength of the seal portion 30 is higher than the opening strength of the fracture portion 13. As a result, due to the difference in elongation at break and the difference in tensile modulus between the orientation relaxation part 21a and the orientation part 21b, when the lid 11 is stretched to a certain extent, the difference between the opposing short sides of the orientation relaxation part 21a or between the opposing short and long sides. The fracture portion 13, which is a region including the orientation portion 21b located at , is fractured earlier than other parts of the lid 11, and a small hole is created through which water vapor is discharged. Steam is discharged from the cup container 1 through this small hole as the steam port 21c.
　カップ容器１の内容物１００を電子レンジで加熱後、ユーザがタブ１１ａを摘まんで蓋１１をカップ本体１０から離れる方向に移動させることで、蓋１１は、フランジ１０ｂから剥がれる。これにより、カップ本体１０から内容物を取り出せる様になる。 After heating the contents 100 of the cup container 1 in a microwave oven, the user pinches the tab 11a and moves the lid 11 in a direction away from the cup body 10, so that the lid 11 is peeled off from the flange 10b. This allows the contents to be taken out from the cup body 10.
　このように構成されたカップ容器１によれば、カップ本体１０及び蓋１１をヒートシール（熱融着）したときのシール強度を、破断部１３の開口強度よりも高くした。これにより、電子レンジでカップ容器１の内容物１００を加熱したときに、破断部１３が先に開口し、破断部１３を確実に開口させることが可能となる。よって、カップ容器１は、電子レンジ加熱時に破断部１３を破断させて、内部の蒸気を排出することができる。 According to the cup container 1 configured in this manner, the sealing strength when the cup body 10 and the lid 11 are heat-sealed (thermally fused) is made higher than the opening strength of the fracture portion 13. Thereby, when the contents 100 of the cup container 1 are heated in a microwave oven, the broken part 13 opens first, and it becomes possible to open the broken part 13 reliably. Therefore, when the cup container 1 is heated in a microwave oven, the breakage portion 13 is broken and the internal steam can be discharged.
　また、カップ本体１０及び蓋１１のシール部３０がフランジ１０ｂの外周縁側に存せず、フランジ１０ｂの内周縁側でヒートシールされることで、フランジ１０ｂから蓋１１が剥離するときに、フランジ１０ｂが変形することを防止できる。よって、フランジ１０ｂから蓋１１を剥がす方向の力が、シール部３０に集中することから、シール部３０のシール強度が破断部１３の開口強度より高い構成であっても、蓋１１を容易に剥離させることができる。 Moreover, since the seal portion 30 of the cup body 10 and the lid 11 is not located on the outer peripheral edge of the flange 10b but is heat-sealed on the inner peripheral edge of the flange 10b, when the lid 11 is peeled off from the flange 10b, the flange 10b can be prevented from deforming. Therefore, the force in the direction of peeling off the lid 11 from the flange 10b is concentrated on the seal portion 30, so even if the sealing strength of the seal portion 30 is higher than the opening strength of the broken portion 13, the lid 11 can be easily peeled off. can be done.
　また、カップ本体１０は、胴部１０ａ及びフランジ１０ｂに複数のリブ１０ｃを設けることで、フランジ１０ｂの変形を抑制できることから、蓋１１を容易に剥がすことが可能となる。 Moreover, by providing the plurality of ribs 10c on the body 10a and the flange 10b, the cup body 10 can suppress deformation of the flange 10b, so that the lid 11 can be easily peeled off.
　また、シール部３０は、幅狭部３１及び幅広部３２を、少なくともタブ１１ａと対向する部位に設け、そして、幅広部３２が径方向外方に突出する構成とすることで、幅広部３２の先端に蓋１１を剥離方向に移動させたときの応力が集中する。よって、蓋１１がフランジ１０ｂから剥離する基点が幅広部３２の先端に生じることになり、蓋１１の剥離性が高くなり、蓋１１を容易に剥がすことができる。また、幅広部３２において、シール部３０が内方に突出せず、シール部３０の内周縁がフランジ１０ｂと同形状であることから、カップ容器１の加熱時に内圧が上昇し、蓋１１が変形しても、シール部３０が剥離することを防止できる。 Further, the seal portion 30 is configured such that the narrow portion 31 and the wide portion 32 are provided at least in a portion facing the tab 11a, and the wide portion 32 protrudes outward in the radial direction. Stress when the lid 11 is moved in the peeling direction is concentrated at the tip. Therefore, the base point at which the lid 11 is peeled off from the flange 10b occurs at the tip of the wide portion 32, so that the releasability of the lid 11 is increased, and the lid 11 can be easily peeled off. In addition, in the wide portion 32, the seal portion 30 does not protrude inward and the inner peripheral edge of the seal portion 30 has the same shape as the flange 10b, so when the cup container 1 is heated, the internal pressure increases and the lid 11 is deformed. Even if the seal portion 30 is removed, it is possible to prevent the seal portion 30 from peeling off.
　上述した実施形態に係るカップ容器１及び蓋１１によれば、カップ本体１０及び蓋１１のシール部３０のシール強度を破断部１３の開口強度よりも高くすることで、破断部１３を確実に開口させることが可能となる。 According to the cup container 1 and the lid 11 according to the embodiment described above, the sealing strength of the seal portion 30 of the cup body 10 and the lid 11 is made higher than the opening strength of the breaking portion 13, thereby ensuring that the breaking portion 13 is opened. It becomes possible to do so.
　なお、本発明は、上記実施形態に限定されるものではない。上述した例では、包装体１をカップ容器とする構成を説明したが、これに限定されず、包装体１は、二以上の部材がヒートシールによって一体に形成され、そして、一部に破断部１３を有する構成であれば各種包装容器に適用することができる。例えば、図２０に示すように、包装体１は、パウチ容器であってもよい。 Note that the present invention is not limited to the above embodiments. In the above example, the configuration in which the package 1 is a cup container is explained, but the package 1 is not limited to this, and the package 1 has two or more members integrally formed by heat sealing, and has a broken part in part. 13 can be applied to various packaging containers. For example, as shown in FIG. 20, the package 1 may be a pouch container.
　次に、第２の実施形態として、包装体としてのパウチ容器１Ａの構成を、図２０を用いて説明する。なお、第２の実施形態のパウチ容器１Ａの構成のうち、上述した第１の実施形態のカップ容器１と同様の構成には同一符号を付し、その詳細な説明は省略する。 Next, as a second embodiment, the configuration of a pouch container 1A as a package will be described using FIG. 20. In addition, among the configurations of the pouch container 1A of the second embodiment, the same components as those of the cup container 1 of the first embodiment described above are denoted by the same reference numerals, and detailed explanation thereof will be omitted.
　図２０に示すように、パウチ容器１Ａは、袋状容器であって、食品等の内容物１００を収容し、電子レンジで加熱できる容器である。また、パウチ容器１Ａは、例えば、自立できるスタンディングパウチである。 As shown in FIG. 20, the pouch container 1A is a bag-like container that stores contents 100 such as food and can be heated in a microwave oven. Further, the pouch container 1A is, for example, a standing pouch that can stand on its own.
　図２０に示すように、パウチ容器１Ａは、胴部４１と、胴部４１と一体に設けられる底部４２と、を備える。パウチ容器１Ａは、矩形状の一対の胴部シート５１及び一方向に長い矩形状の一枚の底部シート５２を熱融着することで、胴部４１及び底部４２を有する袋状に構成される。即ち、パウチ容器１Ａは、三つの部材を熱融着することで構成される包装体である。 As shown in FIG. 20, the pouch container 1A includes a body 41 and a bottom 42 provided integrally with the body 41. The pouch container 1A is configured into a bag shape having a body 41 and a bottom 42 by heat-sealing a pair of rectangular body sheets 51 and a rectangular bottom sheet 52 long in one direction. . That is, the pouch container 1A is a package constructed by heat-sealing three members.
　胴部４１は、一対の胴部シート５１により構成される。底部４２は、一対の胴部シート５１の下端部及び底部シート５２により構成される。 The trunk 41 is composed of a pair of trunk sheets 51. The bottom portion 42 is constituted by the lower end portions of the pair of trunk sheets 51 and the bottom sheet 52.
　胴部シート５１及び底部シート５２は、上述した蓋１１を形成するフィルムと同一の層構成を有する。即ち、胴部シート５１及び底部シート５２は、図３に示すように、二軸延伸配向フィルム２１を外面側に有する積層構造のフィルムにより形成される。例えば、胴部シート５１及び底部シート５２は、二軸延伸配向フィルム２１、接着剤層２２及びシーラントフィルム２３を有する。なお、胴部シート５１及び底部シート５２は、印刷層を有していても良い。 The body sheet 51 and the bottom sheet 52 have the same layer structure as the film forming the lid 11 described above. That is, as shown in FIG. 3, the trunk sheet 51 and the bottom sheet 52 are formed of a laminated film having a biaxially stretched oriented film 21 on the outer surface side. For example, the body sheet 51 and the bottom sheet 52 have a biaxially stretched oriented film 21, an adhesive layer 22, and a sealant film 23. Note that the trunk sheet 51 and the bottom sheet 52 may have a printed layer.
　また、一対の胴部シート５１の少なくとも一方に、一以上の配向緩和部２１ａが設けられ、一以上の配向緩和部２１ａによって、破断部１３が形成される。 Furthermore, at least one of the pair of trunk sheets 51 is provided with one or more orientation relaxing portions 21a, and the one or more orientation relaxing portions 21a form the fracture portion 13.
　胴部４１及び底部４２は、一対の胴部シート５１のシーラントフィルム２３同士が対向し、且つ、一対の胴部シート５１の下部の間に、底部４２を構成する底部シート５２が、胴部シート５１のシーラントフィルム２３及び底部シート５２のシーラントフィルム２３が対向するように配置され、一対の胴部シート５１の上部以外の側部及び一対の胴部シート５１及び底部シート５２が熱融着することで形成される。即ち、一対の胴部シート５１及び底部シート５２にシール部６０が形成されて、胴部４１及び底部４２が袋状に形成される。そして、上部開口から内容物１００が充填された後に、一対の胴部４１の上部が熱溶着することで形成されたシール部６１によって、密封されたパウチ容器１Ａが形成される。 In the trunk section 41 and the bottom section 42, the sealant films 23 of the pair of trunk sheets 51 face each other, and between the lower parts of the pair of trunk sheets 51, the bottom sheet 52 constituting the bottom section 42 is connected to the trunk sheet 51. The sealant film 23 of 51 and the sealant film 23 of the bottom sheet 52 are arranged to face each other, and the sides of the pair of body sheets 51 other than the upper part and the pair of body sheets 51 and bottom sheet 52 are thermally fused. is formed. That is, the seal portion 60 is formed on the pair of trunk sheet 51 and bottom sheet 52, so that the trunk section 41 and the bottom section 42 are formed into a bag shape. After the content 100 is filled from the upper opening, the sealed pouch container 1A is formed by the seal portion 61 formed by thermally welding the upper portions of the pair of body portions 41.
　また、パウチ容器１Ａのシール部６０、６１のシール強度は、破断部１３の開口強度よりも高く設定される。これにより、パウチ容器１Ａは、破断部１３を確実に開口させることが可能となる。 Further, the sealing strength of the sealing parts 60 and 61 of the pouch container 1A is set higher than the opening strength of the breakage part 13. This allows the pouch container 1A to reliably open the breakage portion 13.
　即ち、本発明は、複数の部材を熱融着によって形成した包装体とし、熱融着によって形成されるシール部のシール強度を、一部に設けた破断部１３の開口強度よりも高くすることで、破断部１３を確実に開口させることが可能となる。 That is, the present invention provides a package in which a plurality of members are formed by heat-sealing, and the sealing strength of the seal portion formed by heat-sealing is made higher than the opening strength of the broken portion 13 provided in a part. This makes it possible to reliably open the fracture portion 13.
　また、本発明は、上述した実施形態に限定されない。例えば、上述した例では、蓋１１及び胴部シート５１は、配向緩和部２１ａの領域の方が配向部２１ｂよりも破断伸度の数値が高く、且つ、蓋１１の分子配向部における引張弾性率Ｅ１及び分子配向緩和部における引張弾性率Ｅ２の関係を０＜Ｅ２／Ｅ１＜０．５とする例を説明した。しかしながら、蓋１１及び胴部シート５１は、配向緩和部２１ａ及び配向部２１ｂの破断伸度及び引張弾性率Ｅ２／Ｅ１のいずれかが上述した関係に設定される構成であってもよい。 Furthermore, the present invention is not limited to the embodiments described above. For example, in the above-mentioned example, the lid 11 and the body sheet 51 have a higher elongation at break in the region of the orientation relaxation portion 21a than in the orientation portion 21b, and a tensile modulus of elasticity in the molecular orientation portion of the lid 11. An example has been described in which the relationship between E1 and the tensile modulus E2 in the molecular orientation relaxed portion is 0<E2/E1<0.5. However, the lid 11 and the body sheet 51 may have a configuration in which either the elongation at break or the tensile modulus E2/E1 of the orientation relaxing portion 21a and the orientation portion 21b is set to the above-mentioned relationship.
　即ち、本発明は、上記実施形態に限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で種々に変形することが可能である。また、各実施形態は適宜組み合わせて実施してもよく、その場合組み合わせた効果が得られる。更に、上記実施形態には種々の発明が含まれており、開示される複数の構成要件から選択された組み合わせにより種々の発明が抽出され得る。例えば、実施形態に示される全構成要件からいくつかの構成要件が削除されても、課題が解決でき、効果が得られる場合には、この構成要件が削除された構成が発明として抽出され得る。 That is, the present invention is not limited to the above-described embodiments, and can be variously modified in the implementation stage without departing from the spirit thereof. Moreover, each embodiment may be implemented in combination as appropriate, and in that case, the combined effect can be obtained. Furthermore, the embodiments described above include various inventions, and various inventions can be extracted by combinations selected from the plurality of constituent features disclosed. For example, if a problem can be solved and an effect can be obtained even if some constituent features are deleted from all the constituent features shown in the embodiment, the configuration from which these constituent features are deleted can be extracted as an invention.
　１…カップ容器（包装体）、１Ａ…パウチ容器（包装体）、１０…カップ本体、１０ａ…胴部、１０ｂ…フランジ、１０ｃ…リブ、１１…蓋、１１ａ…タブ、１３…破断部、２１…二軸延伸配向フィルム、２１ａ…配向緩和部、２１ｂ…配向部、２１ｃ…蒸気口、２２…接着剤層、２３…シーラントフィルム、３０…シール部、３１…幅狭部、３２…幅広部、４１…胴部、４２…底部、５１…胴部シート、５２…底部シート、６０、６１…シール部、１００…内容物。 DESCRIPTION OF SYMBOLS 1... Cup container (packaging body), 1A... Pouch container (packaging body), 10... Cup body, 10a... Body part, 10b... Flange, 10c... Rib, 11... Lid, 11a... Tab, 13... Broken part, 21 ...Biaxially stretched oriented film, 21a... Orientation relaxation part, 21b... Orientation part, 21c... Steam port, 22... Adhesive layer, 23... Sealant film, 30... Seal part, 31... Narrow width part, 32... Wide width part, 41...Body part, 42...Bottom part, 51...Body sheet, 52...Bottom sheet, 60, 61...Seal part, 100...Contents.

Claims (12)

  1. 　カップ容器のフランジに熱融着される蓋であって、
    　二軸延伸により分子配向された外層フィルムと、
    　前記外層フィルムに積層された、前記フランジに熱融着可能な内層フィルムと、
    　前記外層フィルムに形成された１以上の配向緩和部と、
    　前記１以上の配向緩和部が所定の間隔を空けて対向する部位に形成され、電子レンジによる容器内圧の上昇によって破断する破断部と、
    　を備え、
    　前記破断部の開口強度は、前記フランジに熱融着されるシール強度よりも小さい、蓋。     A lid that is heat-sealed to a flange of a cup container,
    an outer layer film that is molecularly oriented by biaxial stretching;
    an inner layer film laminated on the outer layer film and capable of being heat-sealed to the flange;
    one or more orientation relaxing portions formed in the outer layer film;
    a rupture portion in which the one or more orientation relaxation portions are formed at opposing positions with a predetermined interval, and ruptures due to an increase in internal pressure of the container due to a microwave oven;
    Equipped with
    The opening strength of the broken portion is smaller than the sealing strength heat-sealed to the flange.
  2. 　前記内層フィルムの前記フランジに溶着される溶着部の外形状は、前記フランジの外形状よりも小さい、請求項１に記載の蓋。 The lid according to claim 1, wherein the outer shape of the welded part welded to the flange of the inner layer film is smaller than the outer shape of the flange.
  3. 　前記溶着部は、幅が広い幅広部と、前記幅広部よりも幅が狭い幅狭部と、を有する、請求項２に記載の蓋。 The lid according to claim 2, wherein the welded portion has a wide portion and a narrow portion narrower than the wide portion.
  4. 　前記幅広部は、前記溶着部の一部に設けられる、請求項３に記載の蓋。 The lid according to claim 3, wherein the wide part is provided in a part of the welded part.
  5. 　前記フランジの外周縁よりも外方に突出するタブを有し、
    　前記幅広部は、前記タブと対向する位置に設けられる、請求項４に記載の蓋。     having a tab protruding outward beyond the outer peripheral edge of the flange;
    The lid according to claim 4, wherein the wide portion is provided at a position facing the tab.
  6. 　前記幅広部及び前記幅狭部は複数設けられ、
    　前記複数の幅広部及び前記複数の幅狭部は、前記溶着部の一部に交互に配置される、請求項３に記載の蓋。     A plurality of the wide portions and the narrow portions are provided,
    The lid according to claim 3, wherein the plurality of wide parts and the plurality of narrow parts are alternately arranged in a part of the welded part.
  7. 　前記幅広部及び前記幅狭部は複数設けられ、
    　前記複数の幅広部及び前記複数の幅狭部は、前記溶着部の全周に交互に配置される、請求項３に記載の蓋。     A plurality of the wide portions and the narrow portions are provided,
    The lid according to claim 3, wherein the plurality of wide parts and the plurality of narrow parts are alternately arranged around the entire circumference of the welded part.
  8. 　有底筒状の胴部、及び、前記胴部の開口端に設けられる前記フランジを有する容器本体と
    　前記フランジに熱融着される、請求項１乃至請求項７のいずれか一項に記載の蓋と、　
    を備えるカップ容器。     A container body having a bottomed cylindrical body and the flange provided at an open end of the body, the container body being heat-sealed to the flange, according to any one of claims 1 to 7. The lid and
    A cup container comprising:
  9. 　前記容器本体は、前記胴部の外面及び前記フランジの下面を連続する複数のリブを有する、請求項８に記載のカップ容器。 The cup container according to claim 8, wherein the container main body has a plurality of ribs that extend along the outer surface of the body and the lower surface of the flange.
  10. 　請求項８に記載のカップ容器と、
    　前記カップ容器内に設けられた内容物と、
    　を備える内容物入りカップ容器。     The cup container according to claim 8,
    Contents provided in the cup container;
    A filled cup container comprising:
  11. 　シートを熱融着し、シール部を形成することで袋状に構成した包装体であって、
    　前記シートの少なくとも一部に
    　二軸延伸により分子配向された外層フィルムと、
    　前記外層フィルムに積層された、熱融着可能な内層フィルムと、
    　前記外層フィルムに形成された１以上の配向緩和部と、
    　前記１以上の配向緩和部が所定の間隔を空けて対向する部位に形成され、電子レンジによる容器内圧の上昇によって破断する破断部と、
    　を備え、
    　前記破断部の開口強度は、前記シートが熱融着するシール強度よりも小さい、包装体。     A package configured in a bag shape by heat-sealing sheets and forming a seal part,
    an outer layer film in which at least a portion of the sheet is molecularly oriented by biaxial stretching;
    a heat-sealable inner layer film laminated on the outer layer film;
    one or more orientation relaxing portions formed in the outer layer film;
    a rupture portion in which the one or more orientation relaxation portions are formed at opposing positions with a predetermined interval, and ruptures due to an increase in internal pressure of the container due to a microwave oven;
    Equipped with
    The package has an opening strength of the broken portion that is smaller than a sealing strength of the sheet to be heat-sealed.
  12. 　請求項１１に記載の包装体と、
    　前記包装体内に設けられた内容物と、
    　を備える内容物入り包装体。     The package according to claim 11,
    Contents provided within the package;
    A package containing contents.
PCT/JP2023/029184 2022-08-09 2023-08-09 Lid, cup container, package, and package with content therein WO2024034653A1 (en)

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JP2014097845A (en) * 2012-10-18 2014-05-29 Toppan Printing Co Ltd Cup shaped container for heating and manufacturing method of the same
JP2014237477A (en) * 2013-06-08 2014-12-18 有限会社Ｋ・Ｍプランニング Cup container, and metal mold for the same
JP2019064642A (en) * 2017-09-29 2019-04-25 大和製罐株式会社 Package and film
JP2019136930A (en) * 2018-02-09 2019-08-22 凸版印刷株式会社 Laminate film, package bag, and package container

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