WO2014065354A1 - Multilayer sheet, workpiece, container, packaging container, and packaing container manufacturing method - Google Patents

Multilayer sheet, workpiece, container, packaging container, and packaing container manufacturing method Download PDF

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Publication number
WO2014065354A1
WO2014065354A1 PCT/JP2013/078773 JP2013078773W WO2014065354A1 WO 2014065354 A1 WO2014065354 A1 WO 2014065354A1 JP 2013078773 W JP2013078773 W JP 2013078773W WO 2014065354 A1 WO2014065354 A1 WO 2014065354A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
container
multilayer sheet
sealing
lid
Prior art date
Application number
PCT/JP2013/078773
Other languages
French (fr)
Japanese (ja)
Inventor
仁子 竹本
Original Assignee
出光ユニテック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 出光ユニテック株式会社 filed Critical 出光ユニテック株式会社
Priority to KR1020157013203A priority Critical patent/KR20150077458A/en
Publication of WO2014065354A1 publication Critical patent/WO2014065354A1/en

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Classifications

    • 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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2028—Means for opening the cover other than, or in addition to, a pull tab
    • B65D77/2032—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
    • B65D77/2044—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/76—Making non-permanent or releasable joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2424—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24243—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral
    • B29C66/24244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/328—Leaving the burrs unchanged for providing particular properties to the joint, e.g. as decorative effect
    • B29C66/3284—Leaving the burrs unchanged for providing particular properties to the joint, e.g. as decorative effect for weakening the joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/345—Progressively making the joint, e.g. starting from the middle
    • B29C66/3452—Making complete joints by combining partial joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • B29C66/72341—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer for gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
    • B65B7/2842—Securing closures on containers
    • B65B7/2878—Securing closures on containers by heat-sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
    • B29C66/91931—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined
    • B29C66/91933—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined higher than said fusion temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/929—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Definitions

  • the present invention relates to a multilayer sheet, a processed product, a container, a packaging container, and a method for manufacturing the packaging container.
  • a container with a lid configured to include a container for foods inside the container, a container body provided with a flange on the periphery of the opening of the container body, and a film-like lid material is widely used. It has been.
  • a container with a lid is formed by heat sealing the flange part and the lid provided on the container body from the viewpoint of safely storing foods stored in the container.
  • a high sealing property that makes the seal part difficult to peel off is required, and in the case of opening the lid material, the lid material can be easily peeled off from the container body, and has a sealing property and an easy-opening property. It is necessary to have conflicting characteristics at the same time.
  • Patent Document 1 As a container having such a sealing property and an easy-opening property, a configuration in which a resin reservoir made of a constituent resin of a container main body and a lid member is formed is known (for example, see Patent Document 1).
  • Patent Document 1 At least one of the surface layer of the container main body and the sealing layer of the lid material is agglomerated and broken so that the lid material can be opened.
  • a resin reservoir is formed in a bump shape from the constituent resin of the surface layer of the container body, the surface layer adjacent to the surface layer, and the sealing layer of the lid.
  • the present invention provides a multilayer sheet, a processed product, a container, a packaging container, and a manufacturing method of the packaging container that can form a resin pool by heat sealing even with a thin-walled member and can appropriately set the strength of adhesiveness of the heat sealing part.
  • the purpose is to do.
  • the multilayer sheet of the present invention is a multilayer sheet having a laminated structure of three or more layers, wherein the thickness dimension of at least one layer is 35 ⁇ m or more and 100 ⁇ m or less, and the material constituting the one layer is a loss tangent tan ⁇ at 165 ° C. The value of is not less than 0.18 and not more than 0.50.
  • at least one layer of the multilayer sheet has a thickness dimension of 35 ⁇ m or more and 100 ⁇ m or less, and the loss tangent tan ⁇ value at 165 ° C. is 0.18 or more and 0.50 or less.
  • the material of the layer flows well and a resin reservoir can be formed in an appropriate size at the edge of the heat seal, and the heat seal portion on the edge side where the implementation reservoir is provided depending on the size of the resin reservoir.
  • the strength of adhesiveness can be set as appropriate.
  • the thickness dimension is less than 35 ⁇ m, it becomes difficult to form a resin reservoir at the edge of the heat seal, and if it exceeds 100 ⁇ m, the cost increases during film formation. .
  • the value of tan ⁇ is smaller than 0.18, it becomes difficult to form a resin reservoir at the edge of the heat seal, and if it is larger than 0.50, abnormal appearance of the multilayer sheet is caused by a method such as coextrusion molding.
  • the measuring method and measuring device for the loss tangent tan ⁇ is a dynamic viscoelasticity measuring device (DMS).
  • DMS dynamic viscoelasticity measuring device
  • the layers other than the layer having the above thickness dimension and loss tangent tan ⁇ are not particularly limited, and various materials can be used.
  • various materials for example, materials such as polyolefin resins, polyester resins, saponified ethylene-vinyl acetate copolymers (EVOH), and blended materials thereof can be suitably used.
  • polyolefin resins include polypropylene resins and polyethylene resins
  • polyester resins include polyethylene terephthalate (PET).
  • the oxygen permeation blocking property is provided.
  • a resin that blocks oxygen such as saponified ethylene-vinyl acetate copolymer (EVOH), polyvinylidene chloride (PVDC), polyacrylonitrile (PAN).
  • EVOH saponified ethylene-vinyl acetate copolymer
  • PVDC polyvinylidene chloride
  • PAN polyacrylonitrile
  • the laminated sheet provided can also be provided.
  • various laminated sheets can be provided by combining layers made of the above materials in addition to the layers having the above thickness dimension and loss tangent tan ⁇ . Further, a layer having the above thickness dimension and loss tangent tan ⁇ may be provided.
  • the layer made of at least one material of the present invention is configured not to be a surface layer facing the surface, so that the easy-peelability of the heat-sealed portion when molded into a container or the like is not impaired, and the resin reservoir The peel strength on the side provided with can be improved, and the sealing performance can be improved.
  • the layer made of the above material is preferably a layer adjacent to the surface layer.
  • the multilayer sheet of the present invention is a multilayer sheet comprising a release layer, a surface layer, and a base material layer in this order, and the surface layer has a thickness dimension of 35 ⁇ m to 100 ⁇ m and a loss tangent at 165 ° C.
  • the value of tan ⁇ is from 0.18 to 0.50.
  • the surface layer in the multilayer sheet comprising the release layer, the surface layer, and the base material layer in this order has a thickness dimension of 35 ⁇ m to 100 ⁇ m, and the loss tangent tan ⁇ value at 165 ° C. is 0.18 to 0.50.
  • a resin reservoir can be formed at the edge of the heat seal, the peel strength on the side where the resin reservoir is formed is improved, and the sealing property of a container or the like Can be improved.
  • the structure further provided with the barrier layer it is preferable to set it as the structure further provided with the barrier layer.
  • a barrier layer it can isolate
  • the structure whose thickness dimension is 200 micrometers or more and 2000 micrometers or less.
  • the thickness dimension is 200 ⁇ m or more and 2000 ⁇ m or less.
  • an increase in manufacturing cost (raw material cost) due to an increase in the material to be used is maintained while maintaining the necessary minimum rigidity as a molded article such as a container.
  • the thickness dimension is less than 200 ⁇ m, there is a risk that the rigidity as a molded article such as a container is lowered, and if the thickness dimension is greater than 2000 ⁇ m, many materials are required and manufacturing costs (raw material costs) ) Is increased, so the above range is set.
  • the processed product of the present invention is formed by using the multilayer sheet of the present invention.
  • a thin-walled multilayer sheet of the present invention can adjust the adhesion with a member to be sealed when heat-sealed.
  • the multilayer sheet is preferably formed by heating.
  • a resin reservoir can be formed at the edge of the heat seal, and the peel strength on the side where the resin reservoir is formed is improved.
  • the sheet of the present invention is used.
  • the sealing performance of the manufactured container can be improved.
  • the multilayer sheet of the present invention can be obtained by coextrusion molding, laminating or the like using the material constituting each layer described above.
  • laminating process for example, methods such as extrusion lamination, hot melt lamination, dry lamination, and wet lamination can be used.
  • the multilayer sheet of the present invention is formed into an arbitrary shape such as a cup shape or a tray shape by a forming method such as vacuum forming or pressure forming.
  • a forming method such as vacuum forming or pressure forming.
  • the use is not particularly limited, for example, it can be suitably used for a jelly container, a pudding container, a container showing the color of the contents, and the like.
  • the container of the present invention is formed by using the multilayer sheet of the present invention.
  • a thin-walled multilayer sheet of the present invention can form a resin reservoir at the edge of the heat seal, improve the peel strength on the side where the resin reservoir is formed, and improve the sealing performance of containers and the like. .
  • a resin pool is formed when the flange body is sealed with, for example, a lid material, by including a container body having a flange portion protruding outward from the periphery of the opening for storing the packaged items. It is possible to develop a sealing property due to.
  • the container body preferably has a cup shape or a tray shape.
  • heat sealing can be performed with a general filling and sealing device by making the shape of the container body cup-shaped or tray-shaped.
  • the packaging container of the present invention is a packaging container in which a lid member is bonded to a flange portion of the container body, and the container body is the container of the present invention.
  • the container of the present invention since the container of the present invention is used for the container main body to which the lid member is bonded at the flange portion, the resin reservoir can be formed at the edge of the heat seal even in the thin container main body, and the side on which the resin reservoir is formed As a result, the peel strength can be improved and the sealing performance can be improved.
  • the manufacturing method of the packaging container according to the present invention is a manufacturing method for manufacturing the packaging container according to the present invention, wherein a lid material is stacked on the upper surface of the flange portion of the container body, and the inner peripheral edge is R-processed with respect to the upper surface of the flange portion.
  • An annular seal disc having a curved surface section with a curved cross section, the outer peripheral edge of which is at least partially in contact with the lid material from the tip of the annular seal disc The board is pressed from the top of the lid material and appears on the flange part while forming a hump-shaped resin reservoir on the surface of the container body in the vicinity of the position where the inner peripheral edge of the annular seal board of the flange part contacts.
  • the container body and the lid member are heat-sealed in an annular shape.
  • a sufficient resin reservoir can be formed by heat sealing, high peel strength against heat sealing can be obtained, and sealing performance can be obtained.
  • the term “sealing board” refers to a board-like instrument that is welded by applying pressure and temperature to the surface to be sealed.
  • the bump-shaped resin reservoir is preferably composed of at least two layers of constituent resin on the surface of the container body.
  • both the opening property and the sealing property can be achieved by forming the bump-shaped resin reservoir portion from at least two layers of the constituent resin on the surface of the container body.
  • the bump-shaped resin reservoir further includes a constituent resin of the sealing layer of the lid member.
  • the bump-shaped resin reservoir portion further including the constituent resin of the sealing layer of the lid material.
  • board is provided with the cyclic
  • the packaging container of the present invention is manufactured by the manufacturing method of the packaging container of the present invention.
  • a sufficient resin reservoir can be formed by heat sealing even if it is formed into a thin wall, and high sealing performance of heat sealing can be obtained.
  • Sectional drawing of the multilayer sheet which concerns on one Embodiment of this invention It is the figure which showed the easily openable container using the multilayer sheet
  • 10 is a multilayer sheet
  • the multilayer sheet 10 is a laminate in which three layers of a surface layer 11, an intermediate layer 12 adjacent to the surface layer, and a base layer 13 are sequentially laminated.
  • the thickness dimension of at least one layer is 35 ⁇ m or more and 100 ⁇ m or less, and the value of loss tangent tan ⁇ at 165 ° C. is 0.18 or more and 0.50 or less, preferably 0.20 or more and 0.40 or less, Most preferably, it is 0.23 or more and 0.35 or less.
  • the thickness dimension is less than 35 ⁇ m, there is a disadvantage that it is difficult to form a resin reservoir at the edge of the heat seal.
  • the thickness dimension is greater than 100 ⁇ m, there is a disadvantage that the cost during film formation is increased. Is set. Further, if the value of the loss tangent tan ⁇ at 165 ° C.
  • the value of tan ⁇ can be changed by, for example, changing the blending ratio of polyethylene or elastomer with polypropylene as the main component, or changing the blending ratio of homopolypropylene and random polypropylene.
  • the value of tan ⁇ can be increased by increasing the blending ratio of the random polypropylene relative to the homopolypropylene by changing at least a part of the homopolypropylene to random polypropylene.
  • the value of tan ⁇ can be increased by adding polyethylene or an elastomer having a higher tan ⁇ value than that of polypropylene.
  • the value of tan ⁇ can be lowered by using homopolypropylene having higher stereoregularity than ordinary polypropylene.
  • a layer adjacent to the surface layer 12, which is the intermediate layer 12 in this embodiment can appropriately set the peel strength at the heat seal part depending on the size of the resin reservoir while maintaining the unsealing property,
  • the adhesiveness of the heat seal portion can be appropriately set, and in the case of a container, it is preferable because the sealing property can be improved.
  • the resin that can form the surface layer 11 of the multilayer sheet 10 is, for example, at least ethylene-acrylic acid ester-maleic anhydride copolymer or styrene-grafted propylene resin.
  • examples thereof include a resin composition obtained by blending one with a polypropylene resin.
  • the ethylene-acrylic ester-maleic anhydride copolymer and the styrene-grafted propylene resin are preferably 10 parts by weight or more and 50 parts by weight or less, particularly preferably 100 parts by weight of the polypropylene resin. What is necessary is just to make it add in 15 to 40 weight part.
  • the base layer 13 is a layer which becomes a layer which appears outside the container main body, and as a constituent material, olefin resin such as polypropylene resin and polyethylene resin, polystyrene, etc.
  • olefin resin such as polypropylene resin and polyethylene resin, polystyrene, etc.
  • polyester resins such as polyethylene terephthalate (PET), etc.
  • single layers or laminates of these blend materials for example, ethylene vinyl alcohol copolymer, nylon
  • a resin material such as polyethylene terephthalate (PET) or polyvinylidene chloride (PVDC), a resin that forms a gas barrier layer formed by aluminum vapor deposition, or the like can be used.
  • FIGS. 2A and 2B are schematic views showing an embodiment of the easy-open container 1 of the present invention.
  • FIG. 2A shows a state in which the lid 3 is sealed
  • FIG. 2B shows the lid 3 from the opening start portion 4.
  • FIG. 3 is a cross-sectional view of the opening start portion 4 of FIGS. 2A and 2B.
  • the easy-open container 1 includes a container main body 2 and a lid member 3, and the lid member 3 is placed on the opening 24 of the container main body 2, and is disposed on the periphery of the opening 24 of the container main body 2.
  • the flange portion 25 and the lid 3 are heat-sealed to form an annular heat seal portion 26 (a heat seal portion 262 formed by the annular seal disc 7 shown in FIG. 3 and a heat seal portion formed by the annular seal disc 7a. 261) is formed, and as shown in FIG. 2A, the inside of the easy-open container 1 is sealed.
  • FIG. 4 see FIGS. 7 and 8
  • the lid 3 Is lifted upward (in the direction of the arrow in FIG. 2B), the easy-open container 1 is easily opened.
  • the container body 2 shown in FIGS. 2A, 2B, and 3 is formed by molding the multilayer sheet 10, specifically, by heating, and the surface layer 10 of the multilayer sheet 10 is intermediate to the release layer 21.
  • the layer 12 corresponds to the surface lower layer 22
  • the base layer 13 corresponds to the base material layer 23, and a laminate in which three layers of the peeling layer 21, the surface lower layer 22, and the base material layer 23 are stacked in this order.
  • the container body 2 has a substantially rectangular tray shape having a predetermined depth, and has a substantially rectangular opening 24, and a flange protrudes outward from the periphery of the opening 24. A portion 25 is provided.
  • the release layer 21 of the container body 2 is opened by cohesive peeling which causes cohesive failure.
  • the thickness of the flange portion 25 of the container body 2 is preferably 200 ⁇ m or more and 2000 ⁇ m or less, more preferably 250 ⁇ m or more and 600 ⁇ m or less, and particularly preferably 300 ⁇ m or more and 500 ⁇ m or less.
  • the thickness of the flange portion is thinner than 200 ⁇ m, there is a risk that the rigidity of the container is lowered, and if it is thicker than 2000 ⁇ m, many materials are required and the manufacturing cost (raw material cost) is increased. Since there is a risk of inconvenience, the above range is set.
  • the lid 3 has an outer layer 32 as a base material layer that appears outside the easy-open container 1 and a seal layer 31 that is a sealant layer that is heat-sealed with the release layer 21 of the container body 2. It is the laminated body which consists of.
  • the release layer 21 of the container body 2 and the seal layer 31 of the lid material 3 to be heat sealed are in an unsealed form in which the release layer 21 of the container body 2 is agglomerated and peeled off and is described above as the resin constituting the release layer 21.
  • random polypropylene (RPP), block polypropylene (BPP), linear low density polyethylene (LLDPE), polyethylene or the like can be used.
  • a polyethylene terephthalate (PET) film, a biaxially stretched nylon film (O—Ny), or the like can be used.
  • the easy-open container 1 is disposed near the inner peripheral edge X (see FIG. 3) of the heat seal portion 26 on the flange portion 25, the lower layer 22, the release layer 21, and the container body 2.
  • the bump-shaped resin reservoir 6 is formed such that the seal layer 31 of the lid 3 is pushed out toward the opening 24 of the container body 2.
  • the resin reservoir 6 is formed by collecting a resin reservoir 61 of the release layer 21 of the container body 2, a resin reservoir 62 of the front and lower layers 22, and a resin reservoir 63 of the seal layer 31 of the lid 3. ing.
  • the container body 2 By forming such a resin reservoir portion 6 in an easy-open container 1 in which the release layer 21 of the container body 2 is agglomerated and peeled off, the container body 2 has a high sealing property and is opened by agglomeration peeling.
  • the shape can be adopted and easy-openability can be maintained in a good state, and the lid 3 and the flange portion 25 of the container body 2 in the resin reservoir portion 6 can be easily cut and subjected to stress due to internal pressure.
  • the sealing performance is improved.
  • the resin reservoir 6 is provided on the entire circumference in the vicinity of the inner peripheral edge X of the annular heat seal portion 26 on the upper surface of the flange portion 25 of the container, and the opening start portion 4 of the easy-open container 1 is provided.
  • the outer peripheral edge of the annular heat seal portion 26 is flat or has only a resin reservoir smaller than the resin reservoir portion 6 in the vicinity of the inner peripheral edge X.
  • the easy-open container 1 having a resin reservoir portion (not shown) having the same size as the resin reservoir portion 6 in the vicinity of the inner peripheral edge X also on the entire outer peripheral edge of the heat seal portion 26 has a high sealability and an easy-openability. And it is preferable at the point which is excellent in the opening prevention property of the cover material 3 other than the opening start part 4.
  • a sealing device 70 having annular sealing plates 7 and 7 a as shown in FIG. 3 is used.
  • the lid member 3 is overlapped on the flange portion 25 of the container main body 2.
  • Heat sealing is performed by pressing the heated annular sealing disk 7 (see FIG. 4) of the sealing device 70 from the upper surface, but the inside of the heat sealing unit 26 of the opening start unit 4 as described above.
  • the following method may be used.
  • FIG. 4 is a schematic diagram showing a sealing process of the opening start portion 4 when manufacturing the easy-open container 1 of the present embodiment.
  • the heat seal between the flange portion 25 of the container main body 2 and the lid member 3 is performed by superimposing the lid member 3 on the flange portion 25 of the container main body 2. This is performed by pressing the annular seal disc 7 in the direction of the arrow in FIG. 4, whereby the release layer 21 that appears on the flange portion 25 of the container body 2 and the seal layer 31 of the lid 3 are fused.
  • FIG. 5 is a partial cross-sectional view showing the state of the annular seal disc 7 and the flange portion 25 at the time of heat sealing
  • FIG. 6 is a partial enlarged cross-sectional view of the annular seal disc 7.
  • An annular seal disc 7 used for manufacturing the easy-open container 1 of the present embodiment includes an annular seal portion 7A and a base portion 7B.
  • annular sealing board 7 is not specifically limited, For example, it can select suitably from metals which have heat conductivity, such as aluminum, iron, copper, or these alloys.
  • the thickness and shape of the base portion 7B are not particularly limited, and those appropriately changed according to the sealing device can be suitably used.
  • the seal portion 7A is not particularly limited, but can be appropriately changed according to the flange shape of the target container, such as a circular shape, an elliptical shape, a polygonal shape, a gourd shape, or a tear shape.
  • the seal portion 7A is formed such that the inner peripheral edge thereof is rounded with respect to the upper surface of the flange portion 25, and the outer peripheral edge contacts the lid member 3 with a delay from the tip of the annular seal disc 7 (tip 73 in FIG. 6). Yes.
  • a curved portion 72 having a curved cross section is formed continuously by R processing.
  • the inclined surface portion 71 formed on the outer peripheral edge side of the annular seal disc 7 is inclined with respect to the flange portion 25 from the inner peripheral edge toward the outer peripheral edge as shown in FIG.
  • the angle ( ⁇ ) of the inclined surface portion 71 with respect to the horizontal plane Y to be a surface varies depending on the distance H which is the width of the annular seal disc 7, but is 2 ° or more and 20 ° or less, preferably 3 ° or more and 15 ° or less, more preferably 6 °. It is preferable to set the angle to 12 ° or less.
  • the angle of the inclined surface portion 71 is smaller than 2 °, the resin reservoir portion 6 as shown in FIG.
  • the R processing applied to the curved surface portion 72 formed on the inner peripheral edge side of the annular seal disc 7 varies depending on the width H of the annular seal disc 7, but a value with a curvature radius R larger than 0.5H is preferable.
  • they are 0.55H or more and 0.75H or less, More preferably, they are 0.60H or more and 0.73H or less, Especially preferably, they are 0.65H or more and 0.70H or less.
  • the radius of curvature R is 0.5H or less, there is a possibility that it becomes difficult to selectively form a resin pool on the inner peripheral edge side. Note that if the radius of curvature R is greater than 0.75H, the lid 3 may be damaged during heat sealing, which may cause the inconvenience that it becomes difficult to set the heat sealing condition, so the above range is set. .
  • the inclined surface portion 71 and the curved surface portion 72 are formed such that the boundary A is closer to the inner side (closer to the inner peripheral edge) than the cross-sectional width direction of the annular seal disc 7. Is preferred. If the boundary A is inside with respect to the cross-sectional width direction of the annular seal disc 7, the curved surface portion 72 is formed on the inner peripheral edge side of the annular seal disc 7, and the inclined surface portion 71 is formed on the outer peripheral edge side of the annular seal disc 7. In combination, the tip 73 comes into contact with the lid material 3 from the outer peripheral edge side of the annular seal disc 7 before heat sealing (the outer peripheral edge of the annular seal disc 7 comes in contact with the lid material 3 later than the tip 73).
  • the resin reservoir 6 is selectively formed on the inner side with respect to the opening 24 side on the inner peripheral edge side that is in contact with the tip.
  • the width H is not particularly limited, and for example, 0.8 mm to 3.0 mm, more preferably 0.9 mm to 2.5 mm, and particularly preferably 1 mm to 2 mm are preferably used.
  • the said R process and the cross-section curved surface are carried out to the perimeter of the inner periphery of the annular seal disc
  • a portion 72 is formed, and the portion of the annular seal disc 7 corresponding to the opening start portion 4 of the easy-open container 1 is formed into a curved surface portion 72 having a curved cross section by R processing on the inner peripheral edge.
  • FIG. 1 it is preferable at the point which can manufacture the easy-open container 1 which is excellent in the opening prevention property of the cover material 3.
  • FIG. 1 by setting the curvature radius R to a value larger than 0.5H, a sufficiently large resin reservoir 6 can be formed even when the thickness of the upper and lower layers 22 is thinner than 100 ⁇ m, and has high sealing performance and easy opening. And the easy-open container 1 excellent in the opening prevention property of the cover material 3 other than the opening start part 4 can be manufactured.
  • the annular seal disc 7 is formed in such a manner that the inclined surface portion 71 and the curved surface portion 72 are continuously formed in an annular shape so as to integrally form the circumferential heat seal portion 26 as shown in FIGS. It is good also as a sealing board (seal ring), and also as an annular sealing board (seal ring) which formed the inclined surface part 71 and the curved surface part 72 only to the part corresponding to the opening start part 4 of the easy-open container 1 Also good.
  • the raised resin reservoirs 61 and 62 are formed in the vicinity of the position where the inner peripheral edge of the container body 2 is in contact, that is, in the vicinity of the inner peripheral edge X of the heat seal portion 26 of the container body 2, and the sealing layer 31 of the lid 3 also follows.
  • the resin reservoir 63 is formed, and in the state where the resin reservoir 6 is formed, the peeling layer 21 that appears on the flange portion 25 of the container body 2 and the sealing layer 31 of the lid member 3 are heat-sealed. Both will be fused.
  • the sealing temperature may be appropriately determined depending on the type of material to be heat sealed, etc., but is higher than the melting temperature of the lower layer 22, generally about 160 ° C. to 240 ° C.
  • the temperature may be 180 ° C. or higher and 220 ° C. or lower.
  • the sealing pressure is preferably about 0.98 Pa to 7.845 Pa (10 kg / cm 2 to 80 kg / cm 2 ), more preferably 1.96 Pa to 6.86 Pa (20 kg / cm 2 to 70 kg). / Cm 2 or less), more preferably 25 Pa or more and 60 Pa or less.
  • the pressing force is weaker than 0.98 Pa, there is a possibility that a sufficiently large resin reservoir may not be formed. Even if the pressing force exceeds 7.845 Pa, there is no great difference in the size of the resin reservoir formed. Since the energy is disadvantageously increased, the above range is set.
  • FIG. 3 In order to prevent such a situation, in this case, the sealing layer 31 of the lid member 3 is attached to the peeling layer 21 of the flange portion 25 while forming the above-described bump-shaped resin reservoir portion 6 by the annular sealing disc 7. After the heat sealing, the other annular seal disc 7a (see FIG. 3) is used to prevent the annular seal disc 7a from hitting the resin reservoir 6, and the resin reservoir (not shown) on the outer peripheral side of the annular seal disc 7 is used.
  • the sealing surface of the other annular sealing disk 7a described above may be smooth, it may be a surface capable of partial adhesion such as knurling so as not to impair easy-openability.
  • FIG. 7 is a cross-sectional view showing a state in which the easy-open container 1 of the present embodiment is initially opened
  • FIG. 8 is a cross-sectional view showing a state in which the easy-open container 1 is completely opened. is there.
  • the “initially opened state” refers to a state where the peeled and peeled surface does not reach the resin reservoir 6.
  • the thickness of at least one layer of the multilayer sheet 10 having the surface layer 11, the intermediate layer 12, and the base layer 13 in this order is 35 ⁇ m or more and 100 ⁇ m or less, and the value of the loss tangent tan ⁇ at 165 ° C. Since it is 0.18 or more and 0.50 or less, for example, even if the container body 2 is formed using the thin multilayer sheet 10, the resin of the upper and lower layers 22 flows well when heat-sealed, and a resin pool can be formed. High heat sealability can be obtained.
  • the intermediate layer 12 adjacent to the surface layer 11 to the above-mentioned predetermined thickness dimension and the value of the loss tangent tan ⁇ at 165 ° C., it is possible to easily form a resin pool even if the sealing conditions are relaxed. Furthermore, since the pressing force by the annular seal disc 7 having the seal portion 7A is 0.98 Pa or more and 7.845 Pa or less (10 kg / cm 2 or more and 80 kg / cm 2 or less), even a thin container body 2 can be a good resin. The pool portion 6 can be formed, and high sealing performance of heat and seal can be obtained.
  • the heat seal corresponding to the inner peripheral edge of the seal portion 7A can be made larger than 0.5H, even when the lid member 3 is heat sealed to the thin container body 2, the heat seal corresponding to the inner peripheral edge of the seal portion 7A.
  • the resin reservoir 6 can be selectively formed in the vicinity of the inner peripheral edge X of the portion 26, and conversely, it can be prevented from being formed in the vicinity of the outer peripheral edge, so that a heat seal with high hermeticity can be obtained, and unsealing by the resin reservoir at the time of opening Can be prevented and can be easily opened.
  • the easy-open container 1 is formed by heat-sealing the container body 2 in which the flange portion 25 is disposed on the periphery of the opening 24 and the flange portion 25 of the container body 2 and the lid member 3 in an annular shape. Since the sealing property is maintained and the release layer 21 of the container body 2 cohesively breaks, the lid member 3 can be opened. Therefore, the release layer 21 of the container body 2 and the upper and lower layers adjacent to the release layer 21 Compared with the mode of interfacial debonding with No. 22, the initial opening strength is also stable, and the opening proceeds smoothly.
  • the formed resin reservoir 6 has a peeling layer 21 of the container body 2, a front and lower layer 22 adjacent to the peeling layer 21, and a lid 3 in the vicinity of the inner peripheral edge X of the heat seal portion 26 of the flange portion 25. Since the sealing layer 31 is formed in a bump shape made of a constituent resin, high sealing performance can be secured.
  • the resin reservoir portion 6 can be reliably formed even in the thin-walled container body 2, and a heat seal with high sealing performance can be obtained with certainty. .
  • the inclined surface portion 71 is preferably 2 ° or more and 20 ° or less, more preferably 3 ° or more and 15 ° or less, and further preferably 6 with respect to the surface that is the heat-sealed surface of the lid member 3 overlaid on the flange portion 25. By providing it at an angle of not less than 12 ° and not more than 12 °, it is possible to prevent the peelability of the release layer 21 (surface layer 11) from being impaired during opening.
  • a three-layer structure is illustrated as the multilayer sheet 10, but a multilayer structure of three or more layers can be used.
  • the layer made of the material having the predetermined thickness dimension and the loss tangent tan ⁇ value at 165 ° C. of the present invention is not limited to the intermediate layer 11 and may be any layer. For example, when there are four or more layers, the layers may not be adjacent to the surface layer 11.
  • the layer made of a material having a predetermined thickness dimension and a loss tangent tan ⁇ value at 165 ° C. of the present invention is not limited to one layer, and may be a plurality of layers.
  • the layer configuration of the multilayer sheet 10 may be, for example, the following layer configuration. That is, (A) Surface layer 11 (peeling layer 21) / intermediate layer 12 (surface lower layer 22) / base layer 13 (base material layer 23) / barrier layer (b) surface layer 11 (peeling layer 21) / intermediate layer 12 (surface lower layer) 22) / first base layer 13 (base material layer 23) / barrier layer / second base layer 13 (base material layer 23) (C) Surface layer 11 (release layer 21) / first base layer 13 (base layer 23) / intermediate layer 12 (front lower layer 22) / barrier layer / second base layer 13 (base layer 23) (D) Surface layer 11 (peeling layer 21) / first intermediate layer 12 (front lower layer 22) / first base layer 13 (base material layer 23) / barrier layer / second base layer 13 (base material layer 23) / second Intermediate layer 12 (surface lower layer 22) (E) First surface layer 11 (peeling layer 21) / first intermediate layer 12 (surface lower layer 22)
  • the surface layer 11 is a layer that is heat-sealed with another film or the like.
  • the surface layer 11 is in contact with the contents and is a lid. It becomes a layer to be heat sealed with the sealant of the material 3.
  • the lid member 3 and the heat-sealed portion are peeled from the container body 2 together with the lid member 3.
  • the intermediate layer 12 constitutes a lower layer of the surface layer 11 (release layer 21), for example, the composition of the release layer 21, which flows by heat and uses the multilayer sheet of the present invention.
  • the base layer 13 (base material layer 23) is a main layer of the multilayer sheet 10 as described above, and constitutes the base material layer 23 of the container body 2 formed using the multilayer sheet of the present invention, for example. Is a layer.
  • the adhesive layer is a layer that bonds the base material layer 23 and the barrier layer.
  • the thickness of the adhesive layer is preferably 10 ⁇ m or more and 50 ⁇ m or less, and more preferably 20 ⁇ m or more and 40 ⁇ m or less.
  • the barrier layer is a layer using a resin that blocks oxygen, and by providing the barrier layer, the multilayer sheet 10 having an oxygen permeation blocking property can be provided.
  • the barrier layer for example, materials such as ethylene vinyl alcohol (EVOH), polyvinylidene chloride (PVDC), and polyacrylonitrile (PAN) can be suitably used.
  • the layer thickness of the barrier layer is preferably 10 ⁇ m or more and 210 ⁇ m or less, and more preferably 20 ⁇ m or more and 170 ⁇ m or less.
  • the outer surface layer is made of a material that is compatible with the adjacent layers.
  • the outer surface layer is a layer facing the outer surface of the container body 2 of the easy-open container 1 formed using the multilayer sheet of the present invention.
  • the same material as that used for the surface layer 11 can be suitably used. Further, a material different from the material used for the intermediate layer 12 and the surface layer 11 may be used.
  • a plurality of base material layers may be repeatedly provided in the layer structure.
  • the structure of the above (e) which becomes a cross-sectional object structure is suitable for the reason of film formation stability.
  • the thickness of the intermediate layer 12 (surface lower layer 22) is not less than 35 ⁇ m and not more than 100 ⁇ m, and the value of the loss tangent tan ⁇ at 165 ° C. is not less than 0.18 and not more than 0.50. Therefore, it is possible to easily form a resin pool during heat sealing.
  • the container body 2 of the easy-open container 1 is formed from the multilayer sheet 10 and the release layer 21 of the container body 2 is agglomerated and peeled.
  • the multilayer sheets are stacked and heat-sealed. You may make a bag.
  • cover material 3 is good also as a structure which peels. That is, as shown in FIGS. 9 and 10, in order for the sealing layer 31 of the lid member 3 constituting the easy-open container 1 a to cohesively break and the lid member 3 to peel off, the sealing layer 31 is configured.
  • a styrene graft propylene resin, an adhesive polyolefin resin, or the like can be used as a material to be used.
  • a polyolefin resin such as a polypropylene resin or a polyethylene resin, or a blend system thereof may be used.
  • the present invention includes a case where both the peeling layer 21 of the container body 2 and the sealing layer 31 of the lid 3 are coherently broken and opened when opening. Further, even when the peeling layer 21 of the container body 2 and the front and lower layers 22 are the same member, the same member can be heat sealed with the sealing layer 31 of the lid member 3, and the lid member 3 is opened when the lid member 3 is opened.
  • the case where the three sealing layers 31 cohesively break is included in the present invention because the above-described effects of the present invention can be expected.
  • the peeling layer 21 and the upper and lower layers 22 look like separate layers but are the same member, and for convenience, a portion of the outer and lower layers 22 that is subject to cohesive failure (of the flange portion 25).
  • the surface) may be configured as the release layer 21.
  • the present invention is not limited to the case where the container body 2 is formed from the multilayer sheet 10, but can be used for various applications in which a resin reservoir is formed by heat sealing, for example, the multilayer sheet 10 is heat-sealed to form a bag.
  • an opening start portion forming portion may be formed on the annular seal disc 7 so as to form an opening start portion protruding outwardly on the outer periphery of the heat seal portion 262.
  • the constituent material of the release layer 21 of the container body 2 and the seal layer 31 of the lid member 3 to be agglomerated and peeled is, for example, a combination of polypropylene and ethylene / methacrylic acid.
  • a saturated copolymerized polyester resin can be used for the polymer, the blend system of ethylene / tetracyclododecene copolymer, and the seal layer 31.
  • the easy-open container 1 having the configuration shown in FIGS. 2A, 2B, and 3, depending on the case, it is formed at a portion corresponding to the position where the inner peripheral edge of the annular seal disc 7 contacts.
  • a resin reservoir may be formed in a portion corresponding to a position where the outer peripheral edge of the annular seal disc 7 contacts. Since the resin reservoir formed at the inner peripheral edge is larger than the resin reservoir formed at the outer peripheral edge, good easy-openability and high sealing performance are maintained.
  • the configuration for heat sealing is not limited to the annular seal disc 7, and a seal disc having a shape corresponding to the shape of the heat seal portion 26 may be used. That is, if at least one layer of the multilayer sheet 10 is 35 ⁇ m or more and 100 ⁇ m or less, and the material constituting the one layer has a loss tangent tan ⁇ value at 165 ° C. of 0.18 or more and 0.50 or less, the resin reservoir 6 Can be formed.
  • the specific structure, shape, and the like in the implementation of the present invention may be other structures as long as the object of the present invention can be achieved.
  • Example 1 As shown below, the container body 2 of the easy-open container 1 is formed using a multilayer sheet 10 having the following layer structure, the overall shape is shown in FIGS. 2A and 2B, and the cross-sectional structure of the opening start portion 4 is shown. An easy-open container 1 shown in FIG. 3 was produced.
  • a multilayer sheet having a thickness of 400 ⁇ m comprising the following first surface layer / first intermediate layer / first base layer / first adhesive layer / barrier layer / second adhesive layer / second base layer / outer surface layer by coextrusion molding 10 was molded.
  • First surface layer polypropylene (70% by mass) + ethylene acrylate-maleic anhydride copolymer (30% by mass) (30 ⁇ m)
  • First base layer polypropylene (80% by mass) + polyethylene (20% by mass) (100 ⁇ m)
  • First adhesive layer Polypropylene (15 ⁇ m)
  • Barrier layer Polypropylene (20 ⁇ m)
  • Second adhesive layer polypropylene (15 ⁇ m)
  • Second base layer polypropylene (80% by mass) + polyethylene (20% by mass) (100 ⁇ m)
  • Outer surface layer laminate of polypropylene (75% by mass) + polyolefin elastomer (25% by mass) (60 ⁇ m)
  • a container body 2 with a flange of 45 mm ⁇ 60 mm ⁇ 25 mm was formed by plug-assisted vacuum forming using the multilayer sheet 10.
  • the container body 2 has a flange portion 25 having a width of 5 mm with respect to the opening 24 and is formed to have a substantially rectangular tray shape.
  • a multilayer film having the following configuration is placed as the lid member 3 on the flange portion 25 at the periphery of the opening 24 of the container body 2 obtained as described above, and the following sealing conditions are used. 4 to 6 shown in FIGS.
  • the curved surface portion 72 of the annular sealing disk (seal ring) in which the inclined surface portion 71 and the curved surface portion 72 are formed on the entire circumference are used.
  • the lid member 3 was heat-sealed with respect to the flange portion 25 of the container body 2 to manufacture the easy-open container 1 of the above embodiment.
  • the cohesive peeling which peeling progresses by the cohesive failure of the peeling layer 21 of the container main body 2 will be performed at the time of opening.
  • Seal layer 31 polyethylene (60 ⁇ m)
  • Outer layer 32 polyethylene terephthalate (PET) (12 ⁇ m) / polyamide (nylon) (15 ⁇ m) (in order of PET / Ny / PE)
  • Example 2 In Example 1, except that the configuration of the intermediate layer 12 (front lower layer 22) of the multilayer sheet 10 (container body 2) was as described below, the easy-open container 1 was prepared using the same method as in Example 1. Manufactured. In addition, when the container main body 2 and the lid
  • FIG. (Configuration of the first intermediate layer) First intermediate layer: polypropylene (70% by mass) + polyolefin elastomer (15% by mass) + polyethylene (15% by mass) (60 ⁇ m) (tan ⁇ 0.23)
  • Example 3 In Example 1, except that the configuration of the intermediate layer 12 (front lower layer 22) of the multilayer sheet 10 (container body 2) was as described below, the easy-open container 1 was prepared using the same method as in Example 1. Manufactured. In addition, when the container main body 2 and the lid
  • FIG. (Configuration of the first intermediate layer) First intermediate layer: polypropylene (80% by mass) + polyethylene (20% by mass) (60 ⁇ m) (tan ⁇ 0.19)
  • Test Example 1 The opening strength, the unsealing feeling at the time of opening, and the internal pressure strength of Examples 1 to 3 and Comparative Examples 1 and 2 obtained as described above were compared and evaluated according to the following criteria. The results are shown in Table 1.
  • Opening strength is 4.9 N or more and less than 9.8 N (0.5 kgf / opening port or more and 1.0 kgf / opening port or less)
  • B Opening strength is 9.8 N to 14.7 N (1.0 kgf / opening port to 1.5 kgf / opening port)
  • the easy-open containers of Examples 1 to 3 had moderate open strength, excellent openability, high internal pressure strength, and high sealability. Therefore, it was confirmed that the easy-open containers of Examples 1 to 3 were easy-open and highly sealed. In addition, the unsealed appearance of the easy-open containers of Examples 1 to 3 was generally good.
  • an easy-open container 1 having an overall shape shown in FIGS. 2A and 2B is manufactured by using the following materials and methods using R processing (curved surface portion 72) formed in different shapes in the annular seal disc 7.
  • the heat seal was compared and examined.
  • a cross-sectional view of the annular seal disc 7 is shown in FIG.
  • a container body 2 with a flange of 45 mm ⁇ 60 mm ⁇ 25 mm was formed by plug-assisted vacuum forming.
  • the container body 2 has a flange portion 25 having a width of 5 mm with respect to the opening 24 and is formed to have a substantially rectangular tray shape.
  • First surface layer polypropylene (70% by mass) + ethylene acrylate-maleic anhydride copolymer (30% by mass) (30 ⁇ m)
  • First base layer polypropylene (80% by mass) + polyethylene (20% by mass) (100 ⁇ m)
  • First adhesive layer Polypropylene (15 ⁇ m)
  • Barrier layer Polypropylene (20 ⁇ m)
  • Second adhesive layer polypropylene (15 ⁇ m)
  • Second base layer polypropylene (80% by mass) + polyethylene (20% by mass) (100 ⁇ m)
  • Outer surface layer polypropylene (75% by mass) + polyolefin elastomer (25% by mass) (60 ⁇ m)
  • Seal layer 31 polyethylene (60 ⁇ m)
  • Outer layer 32 polyethylene terephthalate (PET) (12 ⁇ m) / polyamide (nylon) (15 ⁇ m) (in order of PET / Ny / PE)
  • the lid member 3 is placed on the flange portion 25 at the periphery of the opening 24 of the container body 2 obtained as described above, and the following sealing conditions are used.
  • the curved surface portion 72 of the annular seal disc (seal ring) in which the inclined surface portion 71 and the curved surface portion 72 are formed on the entire circumference has a curvature radius R of the following shape
  • the lid member 3 was heat-sealed with respect to the flange portion 25 of the container body 2 to manufacture the easy-open container 1.
  • cover material 3 of this structure are used, the cohesive peeling which peeling progresses by the cohesive failure of the surface layer 21 of the container main body 2 will be performed at the time of opening.
  • Example 2 The opening strength and internal pressure strength of Example 11 obtained as described above were measured and evaluated as shown below. The results are shown in Table 2.
  • Opening strength The corner portion of the lid 3 of the easy-open container 1 having the above shape was gripped with a chuck, and the opening strength when the lid 3 was pulled at an angle of 45 ° with the top surface of the lid 3 was measured.
  • a digital force gauge manufactured by Imada Co., Ltd. was used. The measurement was performed 3 times and the average value was calculated. In Example 11, the average value of the opening strength was 7.45 N (0.76 kgf).
  • the easy-open container 20 was manufactured using the same method. Then, the unsealing strength and the internal pressure strength were measured in the same manner as in Example 11 and evaluated by the above evaluation method. The results are shown in Table 2.
  • the average value of the opening strength of Example 12 was 4.31 N (0.44 kgf), and the average value of the internal pressure strength was 0.096 MPa.
  • Example 14 In Example 11, the easy-open container 1 was manufactured using the same method as in Example 11 except that the seal width of the annular seal disc 7 was set to 2.0 mm. And the internal pressure intensity
  • Example 15 In Example 12, an easily openable container was used in the same manner as in Example 12 except that the seal width of the annular seal disc 7 was 2.0 mm and the radius of curvature R was 0.5H (1.0 mmR). 1 was produced. And the internal pressure intensity
  • the multilayer sheet of the present invention has both high sealing properties and easy opening properties by heat sealing, and can be widely used as packaging containers for various foods such as retort foods, medicines, cosmetics, and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Closing Of Containers (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)

Abstract

The thickness of the intermediate layer (12) in a multilayer sheet (10) provided with a base layer (13), an intermediate layer (12), and a surface layer (11) in said order is 35 µm to 100 µm and the value of the loss tangent (tanδ) at 165°C is 0.18 to 0.50. A tray-shaped container body obtained by molding said multilayer sheet (10) and a lid member are heat-sealed with a ring-shaped sealing plate. The sealing section of the ring-shaped sealing plate is provided with: a rounded curved surface on the inner margin; and an inclined surface provided so as to be continuous with the curved surface and, on the outer margin side, inclined with respect to the surface to be heat-sealed. The radius of curvature (R) of the curved surface is made to be larger than 0.5 H. Even with a container body molded from a thin multilayer sheet (10), it is possible to form a resin build-up section near the inner margin of the heat-sealed section and an easy-open container that is tightly sealed and easy to open is obtained.

Description

多層シート、加工物、容器、包装容器、および、包装容器の製造方法Multilayer sheet, processed product, container, packaging container, and method for producing packaging container
　本発明は、多層シート、加工物、容器、包装容器、および、包装容器の製造方法に関する。 The present invention relates to a multilayer sheet, a processed product, a container, a packaging container, and a method for manufacturing the packaging container.
　食品類の包装形態としては、容器の内部に食品類の収納部と、容器本体の開口部周縁にフランジ部を設けた容器本体とフィルム状の蓋材を備える構成とする蓋付き容器が広く用いられている。
　このような蓋付き容器は、容器の内部に収納される食品類を安全に保存するという観点から、容器本体に設けられたフランジ部と蓋材をヒートシールして、かかるヒートシールにより形成されたシール部を剥がれにくくするといった高い密封性が必要とされるとともに、蓋材を開封する場合にあっては、当該蓋材を容器本体から簡便に剥離可能とする、密封性と易開封性との相反する特性を同時に具備する必要がある。 As a packaging form for foods, a container with a lid configured to include a container for foods inside the container, a container body provided with a flange on the periphery of the opening of the container body, and a film-like lid material is widely used. It has been.
Such a container with a lid is formed by heat sealing the flange part and the lid provided on the container body from the viewpoint of safely storing foods stored in the container. A high sealing property that makes the seal part difficult to peel off is required, and in the case of opening the lid material, the lid material can be easily peeled off from the container body, and has a sealing property and an easy-opening property. It is necessary to have conflicting characteristics at the same time.
　このような密封性と易開封性とを備えた容器として、容器本体と蓋材との構成樹脂からなる樹脂溜まりを形成する構成が知られている（例えば、特許文献１参照）。
　特許文献１に記載の容器は、容器本体の表面層と蓋材のシール層とのうちの少なくともいずれか一方が凝集破壊して蓋材を開封可能とし、ヒートシールするシール部の内周縁に、容器本体の表面層、当該表面層に隣接する表下層および蓋材のシール層の構成樹脂からコブ状に樹脂溜まり部を形成する。 As a container having such a sealing property and an easy-opening property, a configuration in which a resin reservoir made of a constituent resin of a container main body and a lid member is formed is known (for example, see Patent Document 1).
In the container described in Patent Document 1, at least one of the surface layer of the container main body and the sealing layer of the lid material is agglomerated and broken so that the lid material can be opened. A resin reservoir is formed in a bump shape from the constituent resin of the surface layer of the container body, the surface layer adjacent to the surface layer, and the sealing layer of the lid.
特開２００６－２０６１２８号公報JP 2006-206128 A
　ところで、近年の容器の軽量化、リサイクル性などの観点から、容器の薄肉化が望まれているが、上記特許文献１に記載の容器の製造方法では、薄肉の容器の場合には十分な樹脂溜まりを形成できず、得られた容器について高い密封性が得られない場合がある。 By the way, in recent years, it has been desired to reduce the thickness of the container from the viewpoint of weight reduction and recyclability. However, in the method for manufacturing a container described in Patent Document 1, sufficient resin is required in the case of a thin container. In some cases, the reservoir cannot be formed, and the obtained container cannot have high sealing performance.
　本発明は、薄肉の部材でもヒートシールによる樹脂溜まりを形成でき、ヒートシール部分の接着性の強弱を適宜設定可能な多層シート、加工物、容器、包装容器、および、包装容器の製造方法を提供することを目的とする。 The present invention provides a multilayer sheet, a processed product, a container, a packaging container, and a manufacturing method of the packaging container that can form a resin pool by heat sealing even with a thin-walled member and can appropriately set the strength of adhesiveness of the heat sealing part. The purpose is to do.
　本発明の多層シートは、３層以上の積層構造を有する多層シートであって、少なくとも１層の厚さ寸法が３５μｍ以上１００μｍ以下であり、当該１層を構成する材料が１６５℃における損失正接tanδの値が０．１８以上０．５０以下であることを特徴とする。
　本発明では、多層シートの少なくとも１層を、厚さ寸法３５μｍ以上１００μｍ以下、１６５℃における損失正接tanδの値を０．１８以上０．５０以下とするため、当該多層シートを薄肉に形成してヒートシールする場合でも、当該層の材料が良好に流動してヒートシールの縁に樹脂溜まりを適宜の大きさで形成でき、樹脂溜まりの大小などにより実施溜まりが設けられた縁側におけるヒートシール部分の接着性の強弱を適宜設定できる。
　ここで、厚さ寸法が３５μｍより薄くなるとヒートシールの縁に樹脂溜まりを形成しづらくなるという不都合が生じ、１００μｍより厚くなると製膜時のコスト増加という不都合を生じるため、上記範囲に設定される。また、tanδの値が０．１８より小さくなるとヒートシールの縁に樹脂溜まりを形成しづらくなるという不都合を生じ、０．５０より大きくなると共押出成形などの方法により多層シートの外観異常が発生し、好適に多層シートを製造できないため、上記範囲に設定される。
　なお、損失正接tanδの測定方法および測定装置は、動的粘弾性測定装置（DMS）である。そして、構成材料である樹脂の損失正接tanδは、使用する原料の配合によって制御することができる。 The multilayer sheet of the present invention is a multilayer sheet having a laminated structure of three or more layers, wherein the thickness dimension of at least one layer is 35 μm or more and 100 μm or less, and the material constituting the one layer is a loss tangent tan δ at 165 ° C. The value of is not less than 0.18 and not more than 0.50.
In the present invention, at least one layer of the multilayer sheet has a thickness dimension of 35 μm or more and 100 μm or less, and the loss tangent tan δ value at 165 ° C. is 0.18 or more and 0.50 or less. Even in the case of heat sealing, the material of the layer flows well and a resin reservoir can be formed in an appropriate size at the edge of the heat seal, and the heat seal portion on the edge side where the implementation reservoir is provided depending on the size of the resin reservoir. The strength of adhesiveness can be set as appropriate.
Here, if the thickness dimension is less than 35 μm, it becomes difficult to form a resin reservoir at the edge of the heat seal, and if it exceeds 100 μm, the cost increases during film formation. . Also, if the value of tan δ is smaller than 0.18, it becomes difficult to form a resin reservoir at the edge of the heat seal, and if it is larger than 0.50, abnormal appearance of the multilayer sheet is caused by a method such as coextrusion molding. Since the multilayer sheet cannot be produced suitably, the above range is set.
The measuring method and measuring device for the loss tangent tan δ is a dynamic viscoelasticity measuring device (DMS). The loss tangent tan δ of the resin as the constituent material can be controlled by blending the raw materials used.
　ここで、上記厚さ寸法および損失正接tanδの層以外の他の層は、特に限定されるものではなく、各種材料を用いることができる。
　上記の各種材料としては、例えば、ポリオレフィン系樹脂、ポリエステル系樹脂、エチレン－酢酸ビニル共重合体ケン化物（ＥＶＯＨ）およびこれらのブレンド材料などの材料を好適に用いることができる。ポリオレフィン系樹脂としては、ポリプロピレン系樹脂、ポリエチレン系樹脂などが挙げられ、ポリエステル系樹脂としては、ポリエチレンテレフタレート（ＰＥＴ）などが挙げられる。また、例えば、エチレン－酢酸ビニル共重合体ケン化物（ＥＶＯＨ）、ポリ塩化ビニリデン（ＰＶＤＣ）、ポリアクリロニトリル（ＰＡＮ）など、酸素を遮断する樹脂を使用した層を設けることで、酸素透過遮断性を備えた積層シートを提供することもできる。
　さらに、積層構造が４層以上を有する場合には、上記厚さ寸法および損失正接tanδの層の他に、上記の材料からなる層を組み合わせることで、様々な積層シートを提供することができる。なお、さらに上記厚さ寸法および損失正接tanδの層を設けることもできる。 Here, the layers other than the layer having the above thickness dimension and loss tangent tan δ are not particularly limited, and various materials can be used.
As the various materials, for example, materials such as polyolefin resins, polyester resins, saponified ethylene-vinyl acetate copolymers (EVOH), and blended materials thereof can be suitably used. Examples of polyolefin resins include polypropylene resins and polyethylene resins, and examples of polyester resins include polyethylene terephthalate (PET). In addition, for example, by providing a layer using a resin that blocks oxygen, such as saponified ethylene-vinyl acetate copolymer (EVOH), polyvinylidene chloride (PVDC), polyacrylonitrile (PAN), the oxygen permeation blocking property is provided. The laminated sheet provided can also be provided.
Further, when the laminated structure has four or more layers, various laminated sheets can be provided by combining layers made of the above materials in addition to the layers having the above thickness dimension and loss tangent tan δ. Further, a layer having the above thickness dimension and loss tangent tan δ may be provided.
　そして、本発明では、前記の材料からなる層が表面層ではない構成とすることが好ましい。
　本発明では、本発明の少なくとも一層の材料からなる層が表面に面する表面層でない構成とすることで、容器などに成形された際のヒートシールした部分の易剥離性を損なわず、樹脂溜まりが設けられた側の対剥離強度が向上して、密封性を向上させることができる。 And in this invention, it is preferable to set it as the structure which the layer which consists of said material is not a surface layer.
In the present invention, the layer made of at least one material of the present invention is configured not to be a surface layer facing the surface, so that the easy-peelability of the heat-sealed portion when molded into a container or the like is not impaired, and the resin reservoir The peel strength on the side provided with can be improved, and the sealing performance can be improved.
　また、本発明では、前記の材料からなる層が表面層に隣接した層である構成とすることが好ましい。
　本発明では、本発明の少なくとも一層の材料からなる層が表面に面する表面層に隣接した層である構成とすることで、ヒートシールされた際の表面に樹脂溜まりを形成し易くすることができる。 In the present invention, the layer made of the above material is preferably a layer adjacent to the surface layer.
In the present invention, it is possible to easily form a resin reservoir on the surface when heat-sealed by adopting a structure in which the layer made of at least one material of the present invention is a layer adjacent to the surface layer facing the surface. it can.
　本発明の多層シートは、剥離層、表下層、基材層をこれらの順で備えた多層シートであって、前記表下層は、厚さ寸法が３５μｍ以上１００μｍ以下であり、１６５℃における損失正接tanδの値が０．１８以上０．５０以下であることを特徴とする。
　本発明では、剥離層、表下層、基材層を順に備えた多層シートにおける表下層を、厚さ寸法３５μｍ以上１００μｍ以下、１６５℃における損失正接tanδの値を０．１８以上０．５０以下とするため、当該多層シートを薄肉に形成してヒートシールする場合でも、ヒートシールの縁に樹脂溜まりを形成でき、樹脂溜まりが形成された側の対剥離強度が向上して、容器などの密封性を向上させることができる。 The multilayer sheet of the present invention is a multilayer sheet comprising a release layer, a surface layer, and a base material layer in this order, and the surface layer has a thickness dimension of 35 μm to 100 μm and a loss tangent at 165 ° C. The value of tan δ is from 0.18 to 0.50.
In the present invention, the surface layer in the multilayer sheet comprising the release layer, the surface layer, and the base material layer in this order has a thickness dimension of 35 μm to 100 μm, and the loss tangent tan δ value at 165 ° C. is 0.18 to 0.50. Therefore, even when the multilayer sheet is thinly formed and heat-sealed, a resin reservoir can be formed at the edge of the heat seal, the peel strength on the side where the resin reservoir is formed is improved, and the sealing property of a container or the like Can be improved.
　そして、本発明では、バリア層をさらに備えている構成とすることが好ましい。
　本発明では、バリア層を設けることで、外部の酸素や水分と確実に隔離でき、各種封入材料に対応する包装袋に利用できる。 And in this invention, it is preferable to set it as the structure further provided with the barrier layer.
In this invention, by providing a barrier layer, it can isolate | separate reliably from external oxygen and a water | moisture content, and can utilize for the packaging bag corresponding to various enclosure materials.
　また、本発明では、厚さ寸法が、２００μｍ以上２０００μｍ以下である構成とすることが好ましい。
　本発明では、厚さ寸法を２００μｍ以上２０００μｍ以下とすることで、容器などの成形物として必要最小限の剛性を維持しつつ、使用する材料が多くなることによる製造コスト（原料費）の上昇を抑制することができる。
　ここで、厚さ寸法が２００μｍより薄くなると容器などの成形物としての剛性が下がるという不都合を生じるおそれがあり、厚さ寸法が２０００μｍより厚くなると多くの材料が必要となって製造コスト（原料費）が上がるという不都合を生じるおそれがあるため、上記範囲に設定される。 Moreover, in this invention, it is preferable to set it as the structure whose thickness dimension is 200 micrometers or more and 2000 micrometers or less.
In the present invention, by setting the thickness dimension to 200 μm or more and 2000 μm or less, an increase in manufacturing cost (raw material cost) due to an increase in the material to be used is maintained while maintaining the necessary minimum rigidity as a molded article such as a container. Can be suppressed.
Here, if the thickness dimension is less than 200 μm, there is a risk that the rigidity as a molded article such as a container is lowered, and if the thickness dimension is greater than 2000 μm, many materials are required and manufacturing costs (raw material costs) ) Is increased, so the above range is set.
　本発明の加工物は、本発明の多層シートを用いて成形してなることを特徴とする。
　本発明では、薄肉の本発明の多層シートでもヒートシールした場合の被シール部材との接着性を調整することができる。 The processed product of the present invention is formed by using the multilayer sheet of the present invention.
In the present invention, even a thin-walled multilayer sheet of the present invention can adjust the adhesion with a member to be sealed when heat-sealed.
　そして、本発明では、前記多層シートを加熱により成形してなる構成とすることが好ましい。
　本発明では、多層シートの成形として加熱を利用するので、ヒートシールの縁に樹脂溜まりを形成でき、樹脂溜まりが形成された側の対剥離強度が向上して、例えば、本発明のシートを用いて製造した容器などの密封性を向上させることができる。
　本発明の多層シートは、前述した各層を構成する材料を用いて共押出成形、ラミネート加工等によって得ることができる。ラミネート加工としては、例えばエキストルージョンラミネート、ホットメルトラミネート、ドライラミネート、ウエットラミネート等の方法を用いることができる。
　本発明の多層シートは、真空成形、圧空成形等の成形方法により、カップ状やトレー状など任意の形状に成形される。用途は特に限定されないが、例えば、ゼリー容器、プリン容器、内容物の色彩を見せる容器等に好適に用いることができる。 In the present invention, the multilayer sheet is preferably formed by heating.
In the present invention, since heating is used for forming the multilayer sheet, a resin reservoir can be formed at the edge of the heat seal, and the peel strength on the side where the resin reservoir is formed is improved. For example, the sheet of the present invention is used. The sealing performance of the manufactured container can be improved.
The multilayer sheet of the present invention can be obtained by coextrusion molding, laminating or the like using the material constituting each layer described above. As the laminating process, for example, methods such as extrusion lamination, hot melt lamination, dry lamination, and wet lamination can be used.
The multilayer sheet of the present invention is formed into an arbitrary shape such as a cup shape or a tray shape by a forming method such as vacuum forming or pressure forming. Although the use is not particularly limited, for example, it can be suitably used for a jelly container, a pudding container, a container showing the color of the contents, and the like.
　本発明の容器は、本発明の多層シートを用いて成形してなることを特徴とする。
　本発明では、薄肉の本発明の多層シートでもヒートシールの縁に樹脂溜まりを形成でき、樹脂溜まりが形成された側の対剥離強度が向上して、容器などの密封性を向上させることができる。 The container of the present invention is formed by using the multilayer sheet of the present invention.
In the present invention, even a thin-walled multilayer sheet of the present invention can form a resin reservoir at the edge of the heat seal, improve the peel strength on the side where the resin reservoir is formed, and improve the sealing performance of containers and the like. .
　そして、本発明では、被包装物収納用の開口部周縁から外側に突設されるフランジ部を有する容器本体を備えている構成とすることが好ましい。
　本発明では、被包装物収納用の開口部周縁から外側に突設されるフランジ部を有する容器本体を備える構成とすることで、フランジ部上で例えば蓋材とシールされた際、樹脂だまり形成による密封性を発現することができる。 And in this invention, it is preferable to set it as the structure provided with the container main body which has the flange part protrudingly provided by the outer side from the opening part periphery for to-be-packaged goods accommodation.
In the present invention, a resin pool is formed when the flange body is sealed with, for example, a lid material, by including a container body having a flange portion protruding outward from the periphery of the opening for storing the packaged items. It is possible to develop a sealing property due to.
　また、本発明では、前記容器本体の形状は、カップ状あるいはトレー状である構成とすることが好ましい。
　本発明では、容器本体の形状をカップ状あるいはトレー状とすることで、一般的な充填シール装置でヒートシールを行うことができる。 In the present invention, the container body preferably has a cup shape or a tray shape.
In the present invention, heat sealing can be performed with a general filling and sealing device by making the shape of the container body cup-shaped or tray-shaped.
　本発明の包装容器は、蓋材が容器本体のフランジ部において接着された包装容器であって、前記容器本体が本発明の容器であることを特徴とする。
　本発明では、蓋材がフランジ部において接着される容器本体に、本発明の容器を用いているので、薄肉の容器本体でもヒートシールの縁に樹脂溜まりを形成でき、樹脂溜まりが形成された側の対剥離強度が向上して、密封性を向上させることができる。 The packaging container of the present invention is a packaging container in which a lid member is bonded to a flange portion of the container body, and the container body is the container of the present invention.
In the present invention, since the container of the present invention is used for the container main body to which the lid member is bonded at the flange portion, the resin reservoir can be formed at the edge of the heat seal even in the thin container main body, and the side on which the resin reservoir is formed As a result, the peel strength can be improved and the sealing performance can be improved.
　本発明の包装容器の製造方法は、本発明の包装容器を製造する製造方法であって、前記容器本体のフランジ部上面に蓋材を重ね、前記フランジ部上面に対して、内周縁にＲ加工されて断面が曲面状の曲面部が形成された環状シール盤であって、外周縁が当該環状シール盤の先端より蓋材に遅れて接するようにされた形状を、少なくとも一部に有する環状シール盤を前記蓋材上部から押圧し、前記フランジ部の前記環状シール盤の内周縁が接する位置の近傍に、前記容器本体の表面にコブ状の樹脂溜まり部を形成しながら、前記フランジ部に現れる前記容器本体と、前記蓋材とを環状にヒートシールすることを特徴とする。
　本発明では、包装容器を薄肉に成形しても、ヒートシールにより十分な樹脂溜まりを形成でき、ヒートシールの高い対剥離強度が得られ、密封性が得られる。
　本発明においてシール盤とは、被シール面に圧力、温度を掛けて溶接する盤状の器具をいう。 The manufacturing method of the packaging container according to the present invention is a manufacturing method for manufacturing the packaging container according to the present invention, wherein a lid material is stacked on the upper surface of the flange portion of the container body, and the inner peripheral edge is R-processed with respect to the upper surface of the flange portion. An annular seal disc having a curved surface section with a curved cross section, the outer peripheral edge of which is at least partially in contact with the lid material from the tip of the annular seal disc The board is pressed from the top of the lid material and appears on the flange part while forming a hump-shaped resin reservoir on the surface of the container body in the vicinity of the position where the inner peripheral edge of the annular seal board of the flange part contacts. The container body and the lid member are heat-sealed in an annular shape.
In the present invention, even if the packaging container is formed into a thin wall, a sufficient resin reservoir can be formed by heat sealing, high peel strength against heat sealing can be obtained, and sealing performance can be obtained.
In the present invention, the term “sealing board” refers to a board-like instrument that is welded by applying pressure and temperature to the surface to be sealed.
　そして、本発明では、前記コブ状の樹脂溜まり部が容器本体の表面の少なくとも２層の構成樹脂からなる構成とすることが好ましい。
　本発明では、容器本体の表面の少なくとも２層の構成樹脂からコブ状の樹脂溜まり部を形成することで、開封性と密封性とを両立することができる。 In the present invention, the bump-shaped resin reservoir is preferably composed of at least two layers of constituent resin on the surface of the container body.
In the present invention, both the opening property and the sealing property can be achieved by forming the bump-shaped resin reservoir portion from at least two layers of the constituent resin on the surface of the container body.
　また、本発明では、前記コブ状の樹脂溜まり部がさらに蓋材のシール層の構成樹脂を含む構成とすることが好ましい。
　本発明では、蓋材のシール層の構成樹脂をさらに含んでコブ状の樹脂溜まり部を形成することで、開封時に蓋材を剥がしやすくすることができる。 In the present invention, it is preferable that the bump-shaped resin reservoir further includes a constituent resin of the sealing layer of the lid member.
In the present invention, it is possible to easily peel off the lid material at the time of opening by forming the bump-shaped resin reservoir portion further including the constituent resin of the sealing layer of the lid material.
　そして、本発明では、前記環状シール盤は、環状のシール部と基盤部とを備え、前記シール部は、内周縁に曲面加工された曲面部と、当該曲面部に連続して設けられ外周縁側に被ヒートシール面に対して傾斜する斜面部とを備えることが好ましい。また、前記曲面部の曲率半径Ｒは、前記内周縁から外周縁までを距離Ｈとしたとき、０．５Ｈより大きい構成とすると、薄肉の部材をヒートシールする場合でも、広い面積に渡って樹脂を流動させることでシール部の内周縁に対応するヒートシール部分に樹脂溜まりを形成でき、樹脂溜まりが設けられた側の対剥離強度が向上して、密封性の高いヒートシールを得ることが期待できる。 And in this invention, the said annular seal disc | board is provided with the cyclic | annular seal part and the base | substrate part, and the said seal part is continuously provided in the curved surface part by the curved surface part on the inner periphery, and the outer periphery side is provided. It is preferable to provide a slope part inclined with respect to the heat-sealed surface. Further, when the radius of curvature R of the curved surface portion is larger than 0.5 H when the distance from the inner peripheral edge to the outer peripheral edge is H, even when a thin member is heat sealed, the resin is spread over a wide area. It is expected that a resin reservoir can be formed in the heat seal portion corresponding to the inner peripheral edge of the seal portion by flowing the resin, the peel strength on the side where the resin reservoir is provided is improved, and a heat seal with high sealing performance is obtained. it can.
　本発明の包装容器は、本発明の包装容器の製造方法により製造されたことを特徴とする。
　本発明では、薄肉に成形しても、ヒートシールにより十分な樹脂溜まりを形成でき、ヒートシールの高い密封性が得られる。 The packaging container of the present invention is manufactured by the manufacturing method of the packaging container of the present invention.
In the present invention, a sufficient resin reservoir can be formed by heat sealing even if it is formed into a thin wall, and high sealing performance of heat sealing can be obtained.
本発明の一実施形態に係る多層シートの断面図。Sectional drawing of the multilayer sheet which concerns on one Embodiment of this invention. 図１の多層シートを用いた易開封性容器を示した図であって、蓋材で密封された状態を示す概略図。It is the figure which showed the easily openable container using the multilayer sheet | seat of FIG. 1, Comprising: The schematic which shows the state sealed with the cover material. 図１の多層シートを用いた易開封性容器を示した図であって、開封開始部から蓋材を開封した状態を示す概略図。It is the figure which showed the easy-open container using the multilayer sheet | seat of FIG. 1, Comprising: The schematic which shows the state which opened the cover material from the opening start part. 前記易開封性容器の開封開始部の部分断面図。The fragmentary sectional view of the opening start part of the said easily openable container. 前記易開封性容器のシール工程を示した模式図。The schematic diagram which showed the sealing process of the said easily openable container. 前記実施形態におけるヒートシール時の環状シール盤とフランジ部との状態を示した部分断面図。The fragmentary sectional view which showed the state of the annular seal disc | board and flange part at the time of the heat seal in the said embodiment. 前記環状シール盤の部分拡大図。The elements on larger scale of the said annular sealing board. 前記易開封性容器が初期開封された状態を示した部分断面図。The fragmentary sectional view which showed the state by which the said easily openable container was initially opened. 前記易開封性容器が完全に開封された状態を示した部分断面図。The fragmentary sectional view which showed the state by which the said easily openable container was completely opened. 他の実施形態の易開封性容器が初期開封された状態を示した部分断面図。The fragmentary sectional view which showed the state by which the easy-open container of other embodiment was initially opened. 前記易開封性容器が完全に開封された状態を示した部分断面図。The fragmentary sectional view which showed the state by which the said easily openable container was completely opened. 試験例２で実施した環状シール盤の断面図。Sectional drawing of the annular seal disc implemented in Test Example 2. FIG.
　以下、本発明の実施形態を図面に基づいて説明する。
　本実施形態では、本発明の多層シートとして包装容器の容器本体に成形する構成を例示するが、この限りではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In this embodiment, although the structure shape | molded in the container main body of a packaging container is illustrated as a multilayer sheet of this invention, it is not this limitation.
［多層シートの構成］
　図１において、１０は多層シートで、多層シート１０は、表面層１１と、この表面層に隣接した中間層１２と、基層１３の３層が順次積層された積層体である。 [Configuration of multilayer sheet]
In FIG. 1, 10 is a multilayer sheet, and the multilayer sheet 10 is a laminate in which three layers of a surface layer 11, an intermediate layer 12 adjacent to the surface layer, and a base layer 13 are sequentially laminated.
　これら３層のうち、少なくとも１層の厚さ寸法が３５μｍ以上１００μｍ以下であり、１６５℃における損失正接tanδの値が０．１８以上０．５０以下、好ましくは０．２０以上０．４０以下、特に好ましくは０．２３以上０．３５以下である。
　ここで、厚さ寸法が３５μｍより薄くなるとヒートシールの縁に樹脂溜まりを形成しづらくなるというという不都合があり、１００μｍより厚くなると製膜時のコスト増加という不都合を生じるため、上記厚さ寸法に設定される。また、１６５℃における損失正接tanδの値が０．１８より小さくなるとヒートシールの縁に脂溜まりを形成しづらくなるという不都合があり、０．５０より大きくなると共押出成形などの方法により多層シートの外観異常が発生し、好適に多層シートを製造できないため、上記値の範囲に設定される。
　ここで、tanδの値は、例えば、ポリプロピレンを主成分として、ポリエチレンやエラストマーの配合比を変えたり、ホモポリプロピレンとランダムポリプロピレンとの配合割合を変えたり、するなどにより変更することができる。
　より具体的には、ホモポリプロピレンの少なくとも一部をランダムポリプロピレンに変更するなどして、ホモポリプロピレンに対するランダムポリプロピレンの配合割合を多くすることで、tanδの値を上げることができる。また、ポリプロピレンよりもtanδの値が高いポリエチレンやエラストマーを添加することで、tanδの値を上げることができる。
さらに、通常のポリプロピレンよりも立体規則性の高いホモポリプロピレンを用いることでtanδの値を下げることができる。 Among these three layers, the thickness dimension of at least one layer is 35 μm or more and 100 μm or less, and the value of loss tangent tan δ at 165 ° C. is 0.18 or more and 0.50 or less, preferably 0.20 or more and 0.40 or less, Most preferably, it is 0.23 or more and 0.35 or less.
Here, when the thickness dimension is less than 35 μm, there is a disadvantage that it is difficult to form a resin reservoir at the edge of the heat seal. When the thickness dimension is greater than 100 μm, there is a disadvantage that the cost during film formation is increased. Is set. Further, if the value of the loss tangent tan δ at 165 ° C. is smaller than 0.18, it is difficult to form a fat reservoir at the edge of the heat seal, and if it is larger than 0.50, the multilayer sheet is formed by a method such as coextrusion molding. Appearance abnormality occurs, and a multilayer sheet cannot be suitably manufactured, so the value is set within the above range.
Here, the value of tan δ can be changed by, for example, changing the blending ratio of polyethylene or elastomer with polypropylene as the main component, or changing the blending ratio of homopolypropylene and random polypropylene.
More specifically, the value of tan δ can be increased by increasing the blending ratio of the random polypropylene relative to the homopolypropylene by changing at least a part of the homopolypropylene to random polypropylene. Moreover, the value of tan δ can be increased by adding polyethylene or an elastomer having a higher tan δ value than that of polypropylene.
Furthermore, the value of tanδ can be lowered by using homopolypropylene having higher stereoregularity than ordinary polypropylene.
　なお、本実施形態の多層シート１０を、後述する易開封性容器の容器本体に成形して用いる場合、上記所定の厚さ寸法および１６５℃における損失正接tanδの値を示す材料からなる層は、表面層１１ではなく、表面層１２に隣接した層、本実施形態では中間層１２とすることが、開封性を維持したまま、ヒートシール部分における対剥離強度を樹脂溜まりの大小により適宜設定でき、ヒートシール部分の接着性を適宜設定でき、容器の場合には密封性を向上することができるという理由から好ましい。 When the multilayer sheet 10 of the present embodiment is molded into a container body of an easy-open container described later, a layer made of a material that exhibits the predetermined thickness dimension and the value of the loss tangent tan δ at 165 ° C. Instead of the surface layer 11, a layer adjacent to the surface layer 12, which is the intermediate layer 12 in this embodiment, can appropriately set the peel strength at the heat seal part depending on the size of the resin reservoir while maintaining the unsealing property, The adhesiveness of the heat seal portion can be appropriately set, and in the case of a container, it is preferable because the sealing property can be improved.
　そして、多層シート１０を後述する容器本体に利用する場合、多層シート１０の表面層１１を構成可能な樹脂は、例えば、エチレン－アクリル酸エステル－無水マレイン酸共重合体やスチレングラフトプロピレン樹脂の少なくとも一つを、ポリプロピレン系樹脂にブレンドして得られた樹脂組成物が挙げられる。この場合にあっては、エチレン－アクリル酸エステル－無水マレイン酸共重合体やスチレングラフトプロピレン樹脂は、ポリプロピレン系樹脂１００重量部に対して、好ましくは１０重量部以上５０重量部以下、特に好ましくは１５重量部以上４０重量部以下で添加するようにすればよい。 When the multilayer sheet 10 is used for a container body to be described later, the resin that can form the surface layer 11 of the multilayer sheet 10 is, for example, at least ethylene-acrylic acid ester-maleic anhydride copolymer or styrene-grafted propylene resin. Examples thereof include a resin composition obtained by blending one with a polypropylene resin. In this case, the ethylene-acrylic ester-maleic anhydride copolymer and the styrene-grafted propylene resin are preferably 10 parts by weight or more and 50 parts by weight or less, particularly preferably 100 parts by weight of the polypropylene resin. What is necessary is just to make it add in 15 to 40 weight part.
　また、多層シート１０を後述する容器本体に利用する場合、基層１３は容器本体の外部に現れる層となる層であり、構成材料としては、ポリプロピレン系樹脂、ポリエチレン系樹脂等のオレフィン系樹脂やポリスチレン系樹脂、ポリエチレンテレフタレート（ＰＥＴ）等のポリエステル系樹脂等の材料、およびこれらのブレンド材料の単層または積層体や、また、ガスバリアー性を付与すべく、例えばエチレンビニルアルコール共重合体、ナイロン、ポリエチレンテレフタレート（ＰＥＴ）、ポリ塩化ビニリデン（ＰＶＤＣ）等の樹脂材料やアルミ蒸着等で形成されたガスバリアー層を形成する樹脂等を使用することができる。 Moreover, when using the multilayer sheet 10 for the container main body mentioned later, the base layer 13 is a layer which becomes a layer which appears outside the container main body, and as a constituent material, olefin resin such as polypropylene resin and polyethylene resin, polystyrene, etc. Materials, polyester resins such as polyethylene terephthalate (PET), etc., and single layers or laminates of these blend materials, and in order to give gas barrier properties, for example, ethylene vinyl alcohol copolymer, nylon, A resin material such as polyethylene terephthalate (PET) or polyvinylidene chloride (PVDC), a resin that forms a gas barrier layer formed by aluminum vapor deposition, or the like can be used.
［易開封性容器の構成］
　次に、上記多層シート１０を用いた易開封性容器の構成について、図面を参照して説明する。
　図２Ａ，図２Ｂは、本発明の易開封性容器１の一態様を示した概略図であり、図２Ａは蓋材３で密封された状態、図２Ｂは開封開始部４から蓋材３を開封した状態をそれぞれ示している。また、図３は、図２Ａ，図２Ｂの開封開始部４の断面図である。 [Configuration of easy-open container]
Next, the structure of the easily openable container using the said multilayer sheet 10 is demonstrated with reference to drawings.
2A and 2B are schematic views showing an embodiment of the easy-open container 1 of the present invention. FIG. 2A shows a state in which the lid 3 is sealed, and FIG. 2B shows the lid 3 from the opening start portion 4. Each opened state is shown. FIG. 3 is a cross-sectional view of the opening start portion 4 of FIGS. 2A and 2B.
　易開封性容器１は、容器本体２と蓋材３とを備え、容器本体２の開口部２４に対して蓋材３を載置して、容器本体２の開口部２４の周縁に配設されたフランジ部２５と蓋材３とをヒートシールして、環状のヒートシール部２６（図３に示す環状シール盤７で形成されるヒートシール部２６２と環状シール盤７ａで形成されるヒートシール部２６１）が形成され、図２Ａに示すように、易開封性容器１の内部が密封状態とされる。
　一方、密封状態の易開封性容器１を開封するには、図４に示すように（図７，８参照）、易開封性容器１の隅角に設けられた開封開始部４において蓋材３を上部（図２Ｂの矢印方向）に引き上げるようにすれば、易開封性容器１が簡便に開封される。 The easy-open container 1 includes a container main body 2 and a lid member 3, and the lid member 3 is placed on the opening 24 of the container main body 2, and is disposed on the periphery of the opening 24 of the container main body 2. The flange portion 25 and the lid 3 are heat-sealed to form an annular heat seal portion 26 (a heat seal portion 262 formed by the annular seal disc 7 shown in FIG. 3 and a heat seal portion formed by the annular seal disc 7a. 261) is formed, and as shown in FIG. 2A, the inside of the easy-open container 1 is sealed.
On the other hand, in order to open the sealed easy-open container 1, as shown in FIG. 4 (see FIGS. 7 and 8), in the opening start portion 4 provided at the corner of the easy-open container 1, the lid 3 Is lifted upward (in the direction of the arrow in FIG. 2B), the easy-open container 1 is easily opened.
　図２Ａ，図２Ｂおよび図３に示される容器本体２は、上記多層シート１０を成形、具体的には加熱により成形してなるもので、多層シート１０の表面層１０が剥離層２１に、中間層１２が表下層２２に、基層１３が基材層２３に相当し、剥離層２１、表下層２２、基材層２３の３層がこれらの順で積層された積層体である。
　また、当該容器本体２は、所定の深さを有する略長方形のトレー形状であって、略長方形状の開口部２４を有し、当該開口部２４の周縁には、外側に張り出すようにフランジ部２５が配設されている。
　ここで、本実施形態においては、後記する図７に示すが、容器本体２の剥離層２１が凝集破壊される凝集剥離により開封される。 The container body 2 shown in FIGS. 2A, 2B, and 3 is formed by molding the multilayer sheet 10, specifically, by heating, and the surface layer 10 of the multilayer sheet 10 is intermediate to the release layer 21. The layer 12 corresponds to the surface lower layer 22, the base layer 13 corresponds to the base material layer 23, and a laminate in which three layers of the peeling layer 21, the surface lower layer 22, and the base material layer 23 are stacked in this order.
The container body 2 has a substantially rectangular tray shape having a predetermined depth, and has a substantially rectangular opening 24, and a flange protrudes outward from the periphery of the opening 24. A portion 25 is provided.
Here, in this embodiment, as shown in FIG. 7 to be described later, the release layer 21 of the container body 2 is opened by cohesive peeling which causes cohesive failure.
　また、容器本体２のフランジ部２５の厚さ寸法は、好ましくは２００μｍ以上２０００μｍ以下、より好ましくは２５０μｍ以上６００μｍ以下、特に好ましくは３００μｍ以上５００μｍ以下とする。
　ここで、フランジ部の厚さ寸法が２００μｍより薄くなると容器としての剛性が下がるという不都合を生じるおそれがあり、２０００μｍより厚くなると、多くの材料が必要となって製造コスト（原料費）が上がるという不都合を生じるおそれがあることから、上記範囲に設定される。 The thickness of the flange portion 25 of the container body 2 is preferably 200 μm or more and 2000 μm or less, more preferably 250 μm or more and 600 μm or less, and particularly preferably 300 μm or more and 500 μm or less.
Here, if the thickness of the flange portion is thinner than 200 μm, there is a risk that the rigidity of the container is lowered, and if it is thicker than 2000 μm, many materials are required and the manufacturing cost (raw material cost) is increased. Since there is a risk of inconvenience, the above range is set.
　蓋材３は、本実施形態にあっては、易開封性容器１の外部に現れる基材層としての外層３２と、容器本体２の剥離層２１とヒートシールされるシーラント層であるシール層３１からなる積層体である。
　容器本体２の剥離層２１とヒートシールされる蓋材３のシール層３１は、容器本体２の剥離層２１が凝集破壊して剥離する開封態様で、当該剥離層２１を構成する樹脂として前記した樹脂組成物を採用する場合にあっては、ランダムポリプロピレン（ＲＰＰ）やブロックポリプロピレン（ＢＰＰ）、直鎖状低密度ポリエチレン（ＬＬＤＰＥ）、ポリエチレン等を使用することができる。
　また、蓋材３を構成する外層３２は、ポリエチレンテレフタレート（ＰＥＴ）フィルム、二軸延伸ナイロンフィルム（Ｏ－Ｎｙ）等を使用することができる。 In the present embodiment, the lid 3 has an outer layer 32 as a base material layer that appears outside the easy-open container 1 and a seal layer 31 that is a sealant layer that is heat-sealed with the release layer 21 of the container body 2. It is the laminated body which consists of.
The release layer 21 of the container body 2 and the seal layer 31 of the lid material 3 to be heat sealed are in an unsealed form in which the release layer 21 of the container body 2 is agglomerated and peeled off and is described above as the resin constituting the release layer 21. When the resin composition is employed, random polypropylene (RPP), block polypropylene (BPP), linear low density polyethylene (LLDPE), polyethylene or the like can be used.
For the outer layer 32 constituting the lid member 3, a polyethylene terephthalate (PET) film, a biaxially stretched nylon film (O—Ny), or the like can be used.
　なお、このような剥離層２１を容器本体２に、またシール層３１を蓋材３に採用して両者をヒートシールした場合にあっては、両層２１，３１が融着する一方、開封の際には、応力に対して弱い容器本体２の剥離層２１が凝集剥離して、開封が良好に行われることになる。 In addition, when such a peeling layer 21 is employ | adopted for the container main body 2 and the sealing layer 31 is employ | adopted for the lid | cover material 3 and both are heat-sealed, while both layers 21 and 31 fuse | melt, while opening At this time, the peeling layer 21 of the container body 2 that is weak against stress is agglomerated and peeled off, and the opening is performed well.
　そして、易開封性容器１は、図３に示すように、フランジ部２５上に有るヒートシール部２６の内周縁近傍Ｘ（図３参照）に、容器本体２の表下層２２、剥離層２１および蓋材３のシール層３１が、容器本体２の開口部２４方向に押し出されるようにして、コブ状の樹脂溜まり部６が形成されている。
　図３に示すように、樹脂溜まり部６は、容器本体２の剥離層２１の樹脂溜まり６１、表下層２２の樹脂溜まり６２、および蓋材３のシール層３１の樹脂溜まり６３が集まって形成されている。容器本体２の剥離層２１が凝集剥離される開封形態の易開封性容器１にこのような樹脂溜まり部６を形成させることにより、包装容器として高い密封性を備えた上で、凝集剥離による開封形態を採用して易開封性を良好な状態で維持でき、当該樹脂溜まり部６における蓋材３と容器本体２のフランジ部２５との切断が簡便に行われるとともに、内圧による応力がかかる向きと凝集破壊による開封しやすい向きを異ならせることにより、密封性の向上を実現することとなる。 Then, as shown in FIG. 3, the easy-open container 1 is disposed near the inner peripheral edge X (see FIG. 3) of the heat seal portion 26 on the flange portion 25, the lower layer 22, the release layer 21, and the container body 2. The bump-shaped resin reservoir 6 is formed such that the seal layer 31 of the lid 3 is pushed out toward the opening 24 of the container body 2.
As shown in FIG. 3, the resin reservoir 6 is formed by collecting a resin reservoir 61 of the release layer 21 of the container body 2, a resin reservoir 62 of the front and lower layers 22, and a resin reservoir 63 of the seal layer 31 of the lid 3. ing. By forming such a resin reservoir portion 6 in an easy-open container 1 in which the release layer 21 of the container body 2 is agglomerated and peeled off, the container body 2 has a high sealing property and is opened by agglomeration peeling. The shape can be adopted and easy-openability can be maintained in a good state, and the lid 3 and the flange portion 25 of the container body 2 in the resin reservoir portion 6 can be easily cut and subjected to stress due to internal pressure. By changing the direction of easy opening by cohesive failure, the sealing performance is improved.
　また、本発明においては、容器のフランジ部２５上面にある環状のヒートシール部２６の内周縁近傍Ｘの全周に前記した樹脂溜まり部６があって、易開封性容器１の開封開始部４にある環状のヒートシール部２６の外周縁はフラット、若しくは、内周縁近傍Ｘにある樹脂溜まり部６より小さい樹脂溜まりしかなく、容器本体２の開封開始部４以外の部分には、前記環状のヒートシール部２６の外周縁全周にも、内周縁近傍Ｘにある前記樹脂溜まり部６と略同じ大きさの図示しない樹脂溜まり部がある易開封性容器１が、高密封性、易開封性、および、開封開始部４以外からの蓋材３の開封防止性に優れる点で好ましい。 In the present invention, the resin reservoir 6 is provided on the entire circumference in the vicinity of the inner peripheral edge X of the annular heat seal portion 26 on the upper surface of the flange portion 25 of the container, and the opening start portion 4 of the easy-open container 1 is provided. The outer peripheral edge of the annular heat seal portion 26 is flat or has only a resin reservoir smaller than the resin reservoir portion 6 in the vicinity of the inner peripheral edge X. The easy-open container 1 having a resin reservoir portion (not shown) having the same size as the resin reservoir portion 6 in the vicinity of the inner peripheral edge X also on the entire outer peripheral edge of the heat seal portion 26 has a high sealability and an easy-openability. And it is preferable at the point which is excellent in the opening prevention property of the cover material 3 other than the opening start part 4. FIG.
　ここで、易開封性容器１を製造するにあって、図３に示すような環状シール盤７，７ａを備えたシール装置７０を用いる。容器本体２のフランジ部２５と蓋材３とを融着して易開封性容器１を密封状態とするには、容器本体２のフランジ部２５に蓋材３を重ね合わせ、この蓋材３の上面から、シール装置７０の加熱状態の環状シール盤７（図４参照）を押圧することによりヒートシールが実施されるのであるが、前記したような、開封開始部４のヒートシール部２６の内周縁近傍Ｘにコブ状の樹脂溜まり部６を形成するには、例えば、下記のような方法を用いればよい。 Here, in manufacturing the easy-open container 1, a sealing device 70 having annular sealing plates 7 and 7 a as shown in FIG. 3 is used. In order to fuse the flange portion 25 of the container main body 2 and the lid member 3 to make the easy-open container 1 in a sealed state, the lid member 3 is overlapped on the flange portion 25 of the container main body 2. Heat sealing is performed by pressing the heated annular sealing disk 7 (see FIG. 4) of the sealing device 70 from the upper surface, but the inside of the heat sealing unit 26 of the opening start unit 4 as described above. In order to form the bump-shaped resin reservoir 6 near the periphery X, for example, the following method may be used.
　図４は、本実施形態の易開封性容器１を製造する場合における開封開始部４のシール工程を示した模式図である。
　容器本体２のフランジ部２５と蓋材３とのヒートシールは、図４に示すように、容器本体２のフランジ部２５に蓋材３を重ね合わせ、当該蓋材３の上部から、加熱状態の環状シール盤７を図４中の矢印方向に押圧することにより実施され、これにより、容器本体２のフランジ部２５に現れた剥離層２１と蓋材３のシール層３１が融着される。 FIG. 4 is a schematic diagram showing a sealing process of the opening start portion 4 when manufacturing the easy-open container 1 of the present embodiment.
As shown in FIG. 4, the heat seal between the flange portion 25 of the container main body 2 and the lid member 3 is performed by superimposing the lid member 3 on the flange portion 25 of the container main body 2. This is performed by pressing the annular seal disc 7 in the direction of the arrow in FIG. 4, whereby the release layer 21 that appears on the flange portion 25 of the container body 2 and the seal layer 31 of the lid 3 are fused.
　また、図５は、ヒートシール時における環状シール盤７とフランジ部２５の状態を示した部分断面図であり、また、図６は、環状シール盤７の部分拡大断面図である。
　本実施形態の易開封性容器１を製造するために使用される環状シール盤７は、環状のシール部７Ａと、基盤部７Ｂとを備えている。環状シール盤７を構成する材料は特に限定されないが、例えば、アルミ、鉄、銅等の伝熱性を有する金属、またはこれらの合金から適宜選択することができる。基盤部７Ｂの厚みや形状は特に限定されず、シール装置に合わせて、適宜変更したものを好適に用いることができる。 FIG. 5 is a partial cross-sectional view showing the state of the annular seal disc 7 and the flange portion 25 at the time of heat sealing, and FIG. 6 is a partial enlarged cross-sectional view of the annular seal disc 7.
An annular seal disc 7 used for manufacturing the easy-open container 1 of the present embodiment includes an annular seal portion 7A and a base portion 7B. Although the material which comprises the cyclic | annular sealing board 7 is not specifically limited, For example, it can select suitably from metals which have heat conductivity, such as aluminum, iron, copper, or these alloys. The thickness and shape of the base portion 7B are not particularly limited, and those appropriately changed according to the sealing device can be suitably used.
　シール部７Ａは、特に限定されないが、例えば、円型、楕円型、多角型、ひょうたん型、涙型等、目的とする容器のフランジ形状に合わせて、適宜変更することができる。
　シール部７Ａは、フランジ部２５の上面に対して、内周縁にＲ加工が施され、外周縁が環状シール盤７の先端（図６の先端７３）より遅れて蓋材３に当たるようにされている。具体的には、境界Ａ（環状シール盤７の先端７３でもある）を介して、外周縁側には、断面が傾斜状となる斜面部としての傾斜面部７１が、また、内周縁側には、Ｒ加工されて断面が曲面状の曲面部７２が連続して形成されている。 The seal portion 7A is not particularly limited, but can be appropriately changed according to the flange shape of the target container, such as a circular shape, an elliptical shape, a polygonal shape, a gourd shape, or a tear shape.
The seal portion 7A is formed such that the inner peripheral edge thereof is rounded with respect to the upper surface of the flange portion 25, and the outer peripheral edge contacts the lid member 3 with a delay from the tip of the annular seal disc 7 (tip 73 in FIG. 6). Yes. Specifically, through the boundary A (which is also the tip 73 of the annular seal disc 7), on the outer peripheral edge side, there is an inclined surface portion 71 as an inclined surface portion having an inclined cross section, and on the inner peripheral edge side, A curved portion 72 having a curved cross section is formed continuously by R processing.
　このうち、環状シール盤７の外周縁側に形成される傾斜面部７１における、図５のようにフランジ部２５に対して内周縁から外周縁に向かって形成されることとなる傾斜角、すなわち被シール面となる水平面Ｙに対する傾斜面部７１の角度（θ）は環状シール盤７の幅である距離Ｈによって異なるが、２°以上２０°以下、好ましくは３°以上１５°以下、より好ましくは６°以上１２°以下と設定することが好ましい。
　この傾斜面部７１の角度が２°より小さいと、ヒートシール時に押圧した場合であっても、前記した図３に示すような樹脂溜まり部６が、ヒートシール部２６の外周縁近傍にも形成され易くなり、得られた易開封性容器１の開封時におけるヒートシール部２６外側で抵抗が大きくなり、易開封性容器１の開封を円滑に行うことが困難となる。一方、傾斜面部７１の角度が２０°を超えると、境界Ａの周辺がなだらかでなく尖ってしまい、シール時若しくは開封時に蓋材３が切断されてしまう場合があり、易開封性が損なわれるおそれがある。 Among these, the inclined surface portion 71 formed on the outer peripheral edge side of the annular seal disc 7 is inclined with respect to the flange portion 25 from the inner peripheral edge toward the outer peripheral edge as shown in FIG. The angle (θ) of the inclined surface portion 71 with respect to the horizontal plane Y to be a surface varies depending on the distance H which is the width of the annular seal disc 7, but is 2 ° or more and 20 ° or less, preferably 3 ° or more and 15 ° or less, more preferably 6 °. It is preferable to set the angle to 12 ° or less.
When the angle of the inclined surface portion 71 is smaller than 2 °, the resin reservoir portion 6 as shown in FIG. 3 is also formed in the vicinity of the outer peripheral edge of the heat seal portion 26 even when pressed at the time of heat sealing. It becomes easy, resistance becomes large outside the heat seal part 26 at the time of opening of the obtained easily openable container 1, and it becomes difficult to open the easily openable container 1 smoothly. On the other hand, when the angle of the inclined surface portion 71 exceeds 20 °, the periphery of the boundary A is gently pointed and the lid member 3 may be cut at the time of sealing or opening, which may impair easy-openability. There is.
　また、環状シール盤７に内周縁側に形成される曲面部７２に施されるＲ加工としては環状シール盤７の幅Ｈによって異なるが、曲率半径Ｒが０．５Ｈより大きい値が好ましく、より好ましくは０．５５Ｈ以上０．７５Ｈ以下、さらに好ましくは０．６０Ｈ以上０．７３Ｈ以下、特に好ましくは０．６５Ｈ以上０．７０Ｈ以下である。かかる曲率半径Ｒが０．５Ｈ以下となると、選択的に内周縁側に樹脂だまりを形成しにくくなるという不都合を生じるおそれがある。なお、曲率半径Ｒが０．７５Ｈより大きくなるとヒートシール時に蓋材３を傷める可能性があるため、ヒートシール条件の設定が困難になるという不都合を生じるおそれがあるため、上記範囲に設定される。 Further, the R processing applied to the curved surface portion 72 formed on the inner peripheral edge side of the annular seal disc 7 varies depending on the width H of the annular seal disc 7, but a value with a curvature radius R larger than 0.5H is preferable. Preferably they are 0.55H or more and 0.75H or less, More preferably, they are 0.60H or more and 0.73H or less, Especially preferably, they are 0.65H or more and 0.70H or less. When the radius of curvature R is 0.5H or less, there is a possibility that it becomes difficult to selectively form a resin pool on the inner peripheral edge side. Note that if the radius of curvature R is greater than 0.75H, the lid 3 may be damaged during heat sealing, which may cause the inconvenience that it becomes difficult to set the heat sealing condition, so the above range is set. .
　ここで、環状シール盤７に対して、これら傾斜面部７１および曲面部７２は、境界Ａが環状シール盤７の断面幅方向に対して内側寄り（内周縁寄り）となるように形成されることが好ましい。境界Ａが環状シール盤７の断面幅方向に対して内側であれば、環状シール盤７の内周縁側に曲面部７２、当該環状シール盤７の外周縁側に傾斜面部７１が形成されていることも相俟って、ヒートシールに際して環状シール盤７の外周縁側より先端７３が先に蓋材３と接すること（環状シール盤７の外周縁が先端７３より蓋材３に遅れて接すること）が確実になされ、先に接した内周縁側の開口部２４側に対して樹脂溜まり部６が、内側に選択的に形成されることになる。
　なお、幅Ｈは、特に限定されないが、例えば０．８ｍｍ以上３．０ｍｍ以下、さらに好ましくは０．９ｍｍ以上２．５ｍｍ以下、特に好ましくは１ｍｍ以上２ｍｍ以下を好適に用いている。 Here, with respect to the annular seal disc 7, the inclined surface portion 71 and the curved surface portion 72 are formed such that the boundary A is closer to the inner side (closer to the inner peripheral edge) than the cross-sectional width direction of the annular seal disc 7. Is preferred. If the boundary A is inside with respect to the cross-sectional width direction of the annular seal disc 7, the curved surface portion 72 is formed on the inner peripheral edge side of the annular seal disc 7, and the inclined surface portion 71 is formed on the outer peripheral edge side of the annular seal disc 7. In combination, the tip 73 comes into contact with the lid material 3 from the outer peripheral edge side of the annular seal disc 7 before heat sealing (the outer peripheral edge of the annular seal disc 7 comes in contact with the lid material 3 later than the tip 73). The resin reservoir 6 is selectively formed on the inner side with respect to the opening 24 side on the inner peripheral edge side that is in contact with the tip.
The width H is not particularly limited, and for example, 0.8 mm to 3.0 mm, more preferably 0.9 mm to 2.5 mm, and particularly preferably 1 mm to 2 mm are preferably used.
　また、本発明においては、易開封性容器１の開封開始部４以外の部位に対応する、環状シール盤７の内周縁、外周縁の全周に、前記Ｒ加工されて断面が曲面状の曲面部７２が形成されており、易開封性容器１の開封開始部４に対応する環状シール盤７の部位は、内周縁に前記Ｒ加工されて断面が曲面状の曲面部７２が形成されており、外周縁が環状シール盤７の先端７３より蓋材３に遅れて接するようにされた形状を持つ環状シール盤を用いると、高密封性、易開封性、および、開封開始部４以外からの蓋材３の開封防止性に優れる易開封性容器１を製造することができる点で好ましい。
　特に、曲率半径Ｒが０．５Ｈより大きい値とすることで、表下層２２の厚さ寸法が１００μｍより薄い構成でも、十分な大きさの樹脂溜まり６を形成でき、高密封性、易開封性、および、開封開始部４以外からの蓋材３の開封防止性に優れた易開封性容器１を製造できる。 Moreover, in this invention, the said R process and the cross-section curved surface are carried out to the perimeter of the inner periphery of the annular seal disc | board 7 corresponding to parts other than the opening start part 4 of the easy-open container 1 and the outer periphery. A portion 72 is formed, and the portion of the annular seal disc 7 corresponding to the opening start portion 4 of the easy-open container 1 is formed into a curved surface portion 72 having a curved cross section by R processing on the inner peripheral edge. When an annular seal disc having a shape in which the outer peripheral edge comes in contact with the lid member 3 later than the tip 73 of the annular seal disc 7 is used, it is possible to obtain high sealing performance, easy opening, and from other than the opening start portion 4. It is preferable at the point which can manufacture the easy-open container 1 which is excellent in the opening prevention property of the cover material 3. FIG.
In particular, by setting the curvature radius R to a value larger than 0.5H, a sufficiently large resin reservoir 6 can be formed even when the thickness of the upper and lower layers 22 is thinner than 100 μm, and has high sealing performance and easy opening. And the easy-open container 1 excellent in the opening prevention property of the cover material 3 other than the opening start part 4 can be manufactured.
　なお、環状シール盤７は、図２Ａ，図２Ｂに示すような周状のヒートシール部２６を一体的に形成させるため、前記した傾斜面部７１と曲面部７２を環状に連続して形成した環状シール盤（シールリング）としてもよく、また、易開封性容器１の開封開始部４に対応する部位に対してのみ、当該傾斜面部７１と曲面部７２を形成した環状シール盤（シールリング）としてもよい。 2A and 2B, the annular seal disc 7 is formed in such a manner that the inclined surface portion 71 and the curved surface portion 72 are continuously formed in an annular shape so as to integrally form the circumferential heat seal portion 26 as shown in FIGS. It is good also as a sealing board (seal ring), and also as an annular sealing board (seal ring) which formed the inclined surface part 71 and the curved surface part 72 only to the part corresponding to the opening start part 4 of the easy-open container 1 Also good.
［易開封性容器の製造］
　図５および図６に示した形状の環状シール盤７を用いて、容器本体２のフランジ部２５と蓋材３をヒートシールするには、図５に示すように、まず、環状シール盤７における傾斜面部７１と曲面部７２との境界Ａに対応する先端７３が蓋材３に接し、その後、当該境界Ａの内周縁側に形成された曲面部７２が蓋材３の内側に向かって、また、境界Ａの外周縁側に形成された傾斜面部７１が蓋材３の外側に向かって押圧していく。これにより、容器本体２の剥離層２１と当該剥離層２１と隣接する表下層２２の樹脂成分は、前記の境界Ａの下部から容器本体２の内側に押し出され、フランジ部２５の環状シール盤７の内周縁が接する位置の近傍、すなわち、容器本体２のヒートシール部２６の内周縁近傍Ｘに盛り上がったコブ状の樹脂溜まり６１，６２を形成し、また、蓋材３のシール層３１も追随して樹脂溜まり６３を形成して、これらが樹脂溜まり部６を形成した状態で、容器本体２のフランジ部２５に現れた剥離層２１と、蓋材３のシール層３１とがヒートシールされ、両者が融着されることになる。 [Manufacture of easy-open containers]
In order to heat-seal the flange portion 25 of the container body 2 and the lid member 3 using the annular sealing disk 7 having the shape shown in FIGS. 5 and 6, first, as shown in FIG. The tip 73 corresponding to the boundary A between the inclined surface portion 71 and the curved surface portion 72 is in contact with the lid member 3, and thereafter, the curved surface portion 72 formed on the inner peripheral edge side of the boundary A is directed toward the inside of the lid material 3. The inclined surface portion 71 formed on the outer peripheral edge side of the boundary A presses toward the outside of the lid member 3. Thereby, the resin component of the peeling layer 21 of the container main body 2 and the surface lower layer 22 adjacent to the peeling layer 21 is pushed out from the lower part of the boundary A to the inside of the container main body 2, and the annular sealing disk 7 of the flange portion 25. The raised resin reservoirs 61 and 62 are formed in the vicinity of the position where the inner peripheral edge of the container body 2 is in contact, that is, in the vicinity of the inner peripheral edge X of the heat seal portion 26 of the container body 2, and the sealing layer 31 of the lid 3 also follows. In this state, the resin reservoir 63 is formed, and in the state where the resin reservoir 6 is formed, the peeling layer 21 that appears on the flange portion 25 of the container body 2 and the sealing layer 31 of the lid member 3 are heat-sealed. Both will be fused.
　ここで、シール条件として、シール温度としては、ヒートシールされる材料の種類等により適宜決定すればよいが、表下層２２の溶融温度よりも高い温度、一般に、１６０℃以上２４０℃以下程度、より好ましくは１８０℃以上２２０℃以下とすればよい。
　同様に、シール圧力は、好ましくは０．９８Ｐａ以上７．８４５Ｐａ以下（１０ｋｇ／ｃｍ２以上８０ｋｇ／ｃｍ２以下）程度、より好ましくは１．９６Ｐａ以上６．８６Ｐａ以下（２０ｋｇ／ｃｍ２以上～７０ｋｇ／ｃｍ２以下）、さらに好ましくは２５Ｐａ以上６０Ｐａ以下とすればよい。ここで、押圧力が０．９８Ｐａより弱いと十分な大きさの樹脂溜まりができないおそれがあり、押圧力が７．８４５Ｐａより大きくなっても形成される樹脂溜まりの大きさに大差はなく、押圧エネルギーが増大してしまう不都合があるため、上記範囲に設定される。 Here, as the sealing condition, the sealing temperature may be appropriately determined depending on the type of material to be heat sealed, etc., but is higher than the melting temperature of the lower layer 22, generally about 160 ° C. to 240 ° C. Preferably, the temperature may be 180 ° C. or higher and 220 ° C. or lower.
Similarly, the sealing pressure is preferably about 0.98 Pa to 7.845 Pa (10 kg / cm 2 to 80 kg / cm 2 ), more preferably 1.96 Pa to 6.86 Pa (20 kg / cm 2 to 70 kg). / Cm 2 or less), more preferably 25 Pa or more and 60 Pa or less. Here, if the pressing force is weaker than 0.98 Pa, there is a possibility that a sufficiently large resin reservoir may not be formed. Even if the pressing force exceeds 7.845 Pa, there is no great difference in the size of the resin reservoir formed. Since the energy is disadvantageously increased, the above range is set.
　なお、環状シール盤７によるヒートシールのみでは、外周縁側から夾雑物が入りやすくなるおそれがある。そのようなことを防止するために、この場合には、環状シール盤７により、前述したコブ状の樹脂溜まり部６を形成しながら、蓋材３のシール層３１をフランジ部２５の剥離層２１にヒートシールした後に、他の環状シール盤７ａ（図３参照）を用いて、樹脂溜まり部６に、この環状シール盤７ａが当たらず、かつ、環状シール盤７の外周側の図示しない樹脂溜まり部に当たるように押圧して、容器本体２の剥離層２１と蓋材３のシール層３１をヒートシールするようにすればよい。この他の環状シール盤７ａを用いることにより、外周縁側から夾雑物が入り込むことを防止できる。
　なお、前記した他の環状シール盤７ａのシール面は平滑でも良いが、易開封性を損なわないために、ローレット等の部分接着が可能な面にしても構わない。 In addition, there exists a possibility that a foreign material may enter easily from an outer periphery side only by the heat seal by the annular sealing board 7. FIG. In order to prevent such a situation, in this case, the sealing layer 31 of the lid member 3 is attached to the peeling layer 21 of the flange portion 25 while forming the above-described bump-shaped resin reservoir portion 6 by the annular sealing disc 7. After the heat sealing, the other annular seal disc 7a (see FIG. 3) is used to prevent the annular seal disc 7a from hitting the resin reservoir 6, and the resin reservoir (not shown) on the outer peripheral side of the annular seal disc 7 is used. What is necessary is just to heat-seal the peeling layer 21 of the container main body 2, and the sealing layer 31 of the cover material 3 so that it may hit a part. By using this other annular sealing board 7a, it is possible to prevent foreign substances from entering from the outer peripheral edge side.
In addition, although the sealing surface of the other annular sealing disk 7a described above may be smooth, it may be a surface capable of partial adhesion such as knurling so as not to impair easy-openability.
［易開封性容器の開封動作］
　図７は、本実施形態の易開封性容器１が初期開封された状態を示した断面図であり、図８は、当該易開封性容器１が完全に開封された状態を示した断面図である。
　なお、ここでいう「初期開封された状態」とは、凝集剥離された剥離面が樹脂溜まり部６まで達していない状態を指す。 [Opening operation of easy-open container]
FIG. 7 is a cross-sectional view showing a state in which the easy-open container 1 of the present embodiment is initially opened, and FIG. 8 is a cross-sectional view showing a state in which the easy-open container 1 is completely opened. is there.
Here, the “initially opened state” refers to a state where the peeled and peeled surface does not reach the resin reservoir 6.
　前記のようにして、容器本体２のフランジ部２５と蓋材３とをヒートシールして得られた本実施形態の易開封性容器１を開封開始部４から開封するために、図７に示すように、蓋材３に対して図７中の矢印方向に力Ｆがかかった場合には、容器本体２の剥離層２１の凝集剥離が進行する。
　また、この凝集剥離が樹脂溜まり部６に達したところにおいては、剥離層２１の凝集剥離は、当該剥離層２１と隣接する表下層２２に形成された樹脂溜まり６２の形状に沿って進行されることになる。 In order to open the easy-open container 1 of this embodiment obtained by heat-sealing the flange part 25 of the container main body 2 and the lid material 3 as described above from the opening start part 4, it is shown in FIG. As described above, when the force F is applied to the lid member 3 in the direction of the arrow in FIG. 7, the cohesive peeling of the peeling layer 21 of the container body 2 proceeds.
Further, when the aggregated peeling reaches the resin reservoir 6, the aggregated peeling of the release layer 21 proceeds along the shape of the resin reservoir 62 formed on the surface lower layer 22 adjacent to the release layer 21. It will be.
　そして、剥離層２１の凝集剥離が、ヒートシール部２６の切断位置にもなる内周縁近傍Ｘにまで達したら、蓋材３のシール層３１に形成された樹脂溜まり６３の形状に追随するようにして、容器本体２の剥離層２１の樹脂溜まり６１が切断されることにより、易開封性容器１における容器本体２と蓋材３との開封が容易に行われることになる。 Then, when the cohesive peeling of the release layer 21 reaches the vicinity of the inner peripheral edge X, which is also the cutting position of the heat seal portion 26, it follows the shape of the resin reservoir 63 formed in the seal layer 31 of the lid material 3. Thus, the resin reservoir 61 of the release layer 21 of the container body 2 is cut, whereby the container body 2 and the lid member 3 in the easily openable container 1 are easily opened.
［本実施形態の効果］
　前記したような実施形態によれば、次のような効果を奏することができる。
　上記実施形態では、表面層１１、中間層１２、基層１３をこれらの順で備えた多層シート１０における少なくともいずれか一層の厚さ寸法を３５μｍ以上１００μｍ以下で、１６５℃における損失正接tanδの値を０．１８以上０．５０以下としているので、例えば薄肉の多層シート１０を用いて容器本体２を形成しても、ヒートシールしたときに表下層２２の樹脂が良好に流れて樹脂溜まりを形成でき、ヒートシールの高い密封性が得られる。
　特に、表面層１１に隣接する中間層１２を上記所定の厚さ寸法および１６５℃における損失正接tanδの値とすることで、シール条件を緩和しても樹脂だまりを形成し易くすることができる。
　さらに、上記シール部７Ａを有する環状シール盤７による押圧力を０．９８Ｐａ以上７．８４５Ｐａ以下（１０ｋｇ／ｃｍ２以上８０ｋｇ／ｃｍ２以下）としているので、薄肉の容器本体２でも、良好な樹脂溜まり部６を形成でき、ヒートとシールの高い密封性が得られる。 [Effect of this embodiment]
According to the embodiment as described above, the following effects can be obtained.
In the above embodiment, the thickness of at least one layer of the multilayer sheet 10 having the surface layer 11, the intermediate layer 12, and the base layer 13 in this order is 35 μm or more and 100 μm or less, and the value of the loss tangent tan δ at 165 ° C. Since it is 0.18 or more and 0.50 or less, for example, even if the container body 2 is formed using the thin multilayer sheet 10, the resin of the upper and lower layers 22 flows well when heat-sealed, and a resin pool can be formed. High heat sealability can be obtained.
In particular, by setting the intermediate layer 12 adjacent to the surface layer 11 to the above-mentioned predetermined thickness dimension and the value of the loss tangent tan δ at 165 ° C., it is possible to easily form a resin pool even if the sealing conditions are relaxed.
Furthermore, since the pressing force by the annular seal disc 7 having the seal portion 7A is 0.98 Pa or more and 7.845 Pa or less (10 kg / cm 2 or more and 80 kg / cm 2 or less), even a thin container body 2 can be a good resin. The pool portion 6 can be formed, and high sealing performance of heat and seal can be obtained.
　また、シール部７Ａの曲面部７２の曲率半径Ｒを０．５Ｈより大きくすることで、薄肉の容器本体２に蓋材３をヒートシールする場合でも、シール部７Ａの内周縁に対応するヒートシール部２６の内周縁近傍Ｘに選択的に樹脂溜まり部６を形成でき、逆に外周縁近傍には形成されないようにでき、密封性の高いヒートシールが得られるとともに、開封時には樹脂溜まりによる開封性が損なわれることを防止でき、容易に開封できる。
　すなわち、易開封性容器１が、開口部２４の周縁にフランジ部２５を配設する容器本体２と、この容器本体２のフランジ部２５と蓋材３が環状にヒートシールされてなるので、高い密封性が維持されるとともに、容器本体２の剥離層２１が凝集破壊することで、蓋材３が開封可能とされるため、容器本体２の剥離層２１とこの剥離層２１に隣接する表下層２２とを界面剥離させる態様と比較して、初期開封強度も安定し、開封がスムースに進行される。また、開封時に、樹脂溜まり部６にある剥離層２１が伸びて、易開封性容器１の開封外観が悪くなるという問題の発生を防止することができる。
　そして、形成される樹脂溜まり部６は、フランジ部２５のヒートシール部２６の内周縁近傍Ｘには、容器本体２の剥離層２１、この剥離層２１に隣接する表下層２２、および蓋材３のシール層３１の構成樹脂からなるコブ状に形成されているので、高密封性を確保できる。
　特に、曲面部７２の曲率半径Ｒを０．５５Ｈ以上０．７５Ｈ以下とすることで、薄肉の容器本体２でも確実に樹脂溜まり部６を形成でき、密封性の高いヒートシールが確実に得られる。 Further, by making the curvature radius R of the curved surface portion 72 of the seal portion 7A larger than 0.5H, even when the lid member 3 is heat sealed to the thin container body 2, the heat seal corresponding to the inner peripheral edge of the seal portion 7A. The resin reservoir 6 can be selectively formed in the vicinity of the inner peripheral edge X of the portion 26, and conversely, it can be prevented from being formed in the vicinity of the outer peripheral edge, so that a heat seal with high hermeticity can be obtained, and unsealing by the resin reservoir at the time of opening Can be prevented and can be easily opened.
That is, since the easy-open container 1 is formed by heat-sealing the container body 2 in which the flange portion 25 is disposed on the periphery of the opening 24 and the flange portion 25 of the container body 2 and the lid member 3 in an annular shape. Since the sealing property is maintained and the release layer 21 of the container body 2 cohesively breaks, the lid member 3 can be opened. Therefore, the release layer 21 of the container body 2 and the upper and lower layers adjacent to the release layer 21 Compared with the mode of interfacial debonding with No. 22, the initial opening strength is also stable, and the opening proceeds smoothly. Moreover, at the time of opening, the peeling layer 21 in the resin reservoir part 6 extends, and the occurrence of the problem that the unsealed appearance of the easy-open container 1 is deteriorated can be prevented.
The formed resin reservoir 6 has a peeling layer 21 of the container body 2, a front and lower layer 22 adjacent to the peeling layer 21, and a lid 3 in the vicinity of the inner peripheral edge X of the heat seal portion 26 of the flange portion 25. Since the sealing layer 31 is formed in a bump shape made of a constituent resin, high sealing performance can be secured.
In particular, by setting the curvature radius R of the curved surface portion 72 to 0.55H or more and 0.75H or less, the resin reservoir portion 6 can be reliably formed even in the thin-walled container body 2, and a heat seal with high sealing performance can be obtained with certainty. .
　また、傾斜面部７１をフランジ部２５に重ねられた蓋材３の被ヒートシール面である表面に対して好ましくは２°以上２０°以下、より好ましくは３°以上１５°以下、さらに好ましくは６°以上１２°以下で傾斜して設けることで、開封時に剥離層２１（表面層１１）の剥離性が損なわれることを防止できる。 The inclined surface portion 71 is preferably 2 ° or more and 20 ° or less, more preferably 3 ° or more and 15 ° or less, and further preferably 6 with respect to the surface that is the heat-sealed surface of the lid member 3 overlaid on the flange portion 25. By providing it at an angle of not less than 12 ° and not more than 12 °, it is possible to prevent the peelability of the release layer 21 (surface layer 11) from being impaired during opening.
　そして、製造に際しては環状シール盤７の位置決め等も厳密でないため、生産性も良好であり、高品質の易開封性容器１を低コストで提供することができる。 And, since the positioning of the annular seal disc 7 is not strict in manufacturing, the productivity is good and the high-quality easy-open container 1 can be provided at low cost.
　［実施形態の変形］
　なお、以上説明した態様は、本発明の一態様を示したものであって、本発明は、前記した実施形態に限定されるものではなく、本発明の構成を備え、目的および効果を達成できる範囲内での変形や改良が、本発明の内容に含まれるものであることはいうまでもない。また、本発明を実施する際における具体的な構造および形状等は、本発明の目的および効果を達成できる範囲内において、他の構造や形状等としても問題はない。本発明は前記した各実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形や改良は、本発明に含まれるものである。 [Modification of Embodiment]
The aspect described above shows one aspect of the present invention, and the present invention is not limited to the above-described embodiment, and has the configuration of the present invention and can achieve the object and effect. It goes without saying that modifications and improvements within the scope are included in the content of the present invention. Further, the specific structure, shape, etc. in carrying out the present invention are not problematic as other structures, shapes, etc., within the scope of achieving the objects and effects of the present invention. The present invention is not limited to the above-described embodiments, and modifications and improvements within the scope that can achieve the object of the present invention are included in the present invention.
　例えば、前記実施形態では、多層シート１０として３層構造を例示したが、３層以上の多層構造とすることができる。また、本発明の所定の厚さ寸法および１６５℃における損失正接tanδの値の材料からなる層としては、中間層１１に限られるものではなく、いずれの層としてもよい。例えば、４層以上ある場合、表面層１１に隣接しない層としてもよい。さらに、本発明の所定の厚さ寸法および１６５℃における損失正接tanδの値の材料からなる層としては、１層のみに限らず、複数の層としてもよい。
　すなわち、多層シート１０（容器本体２）の層構成としては、例えば以下に示す層構成としてもよい。
　すなわち、
（ａ）表面層１１（剥離層２１）／中間層１２（表下層２２）／基層１３（基材層２３）／バリア層
（ｂ）表面層１１（剥離層２１）／中間層１２（表下層２２）／第一基層１３（基材層２３）／バリア層／第二基層１３（基材層２３）
（ｃ）表面層１１（剥離層２１）／第一基層１３（基材層２３）／中間層１２（表下層２２）／バリア層／第二基層１３（基材層２３）
（ｄ）表面層１１（剥離層２１）／第一中間層１２（表下層２２）／第一基層１３（基材層２３）／バリア層／第二基層１３（基材層２３）／第二中間層１２（表下層２２）
（ｅ）第一表面層１１（剥離層２１）／第一中間層１２（表下層２２）／第一基層１３（基材層２３）／バリア層／第二基層１３（基材層２３）／第二中間層１２（表下層２２）／外表層
（ｆ）第一表面層１１（剥離層２１）／第一中間層１２（表下層２２）／第一基層１３（基材層２３）／接着層／バリア層／接着層／第二基層１３（基材層２３）／外表層
などの構造を挙げることができる。 For example, in the above-described embodiment, a three-layer structure is illustrated as the multilayer sheet 10, but a multilayer structure of three or more layers can be used. In addition, the layer made of the material having the predetermined thickness dimension and the loss tangent tan δ value at 165 ° C. of the present invention is not limited to the intermediate layer 11 and may be any layer. For example, when there are four or more layers, the layers may not be adjacent to the surface layer 11. Furthermore, the layer made of a material having a predetermined thickness dimension and a loss tangent tan δ value at 165 ° C. of the present invention is not limited to one layer, and may be a plurality of layers.
That is, the layer configuration of the multilayer sheet 10 (container body 2) may be, for example, the following layer configuration.
That is,
(A) Surface layer 11 (peeling layer 21) / intermediate layer 12 (surface lower layer 22) / base layer 13 (base material layer 23) / barrier layer (b) surface layer 11 (peeling layer 21) / intermediate layer 12 (surface lower layer) 22) / first base layer 13 (base material layer 23) / barrier layer / second base layer 13 (base material layer 23)
(C) Surface layer 11 (release layer 21) / first base layer 13 (base layer 23) / intermediate layer 12 (front lower layer 22) / barrier layer / second base layer 13 (base layer 23)
(D) Surface layer 11 (peeling layer 21) / first intermediate layer 12 (front lower layer 22) / first base layer 13 (base material layer 23) / barrier layer / second base layer 13 (base material layer 23) / second Intermediate layer 12 (surface lower layer 22)
(E) First surface layer 11 (peeling layer 21) / first intermediate layer 12 (front lower layer 22) / first base layer 13 (base material layer 23) / barrier layer / second base layer 13 (base material layer 23) / Second intermediate layer 12 (surface lower layer 22) / outer surface layer (f) first surface layer 11 (release layer 21) / first intermediate layer 12 (surface lower layer 22) / first base layer 13 (base material layer 23) / adhesion Examples of the structure include layer / barrier layer / adhesive layer / second base layer 13 (base material layer 23) / outer surface layer.
　ここで、表面層１１（剥離層２１）は、他のフィルムなどとヒートシールされる層で、例えば、本発明の多層シートを容器本体２の形状に成形したときに、内容物と接しかつ蓋材３のシーラントとヒートシールされる層となる。そして、上述した易開封性容器１の開封のように、蓋材３とヒートシールされた部分は、蓋材３と共に容器本体２から剥離される。
　また、中間層１２（表下層２２）は、表面層１１（剥離層２１）の下層を構成し、例えば上記剥離層２１の組成とすることで、熱により流動し、本発明の多層シートを用いて成形された容器本体２を蓋材３とヒートシールしたときに、樹脂溜まりを形成する層である。
　さらに、基層１３（基材層２３）は、上述したように、多層シート１０の主要となる層で、例えば本発明の多層シートを用いて成形された容器本体２の基材層２３を構成する層である。
　そして、接着層は、基材層２３とバリア層とを接着する層で、例えばウレタン系のエラストマー、スチレン系のエラストマー、無水マレイン酸変性ポリエチレン、無水マレイン酸変性ポリプロピレン、エチレン酢酸ビニル（ＥＶＡ）などの材料を好適に用いることができる。接着層の厚みは、１０μｍ以上５０μｍ以下が好ましく、２０μｍ以上４０μｍ以下がさらに好ましい。
　また、バリア層は、酸素を遮断する樹脂を使用した層で、当該バリア層を備えることにより酸素透過遮断性を備えた多層シート１０を提供できる。バリア層としては、例えば、エチレンビニルアルコール（ＥＶＯＨ）、ポリ塩化ビニリデン（ＰＶＤＣ）、ポリアクリロニトリル（ＰＡＮ）などの材料を好適に用いることができる。また、バリア層の層厚は、１０μｍ以上２１０μｍ以下が好ましく、２０μｍ以上１７０μｍ以下がさらに好ましい。
　外表層は、隣接する層と相性の良い材料が用いられ、例えば、本発明の多層シートを用いて成形された易開封性容器１の容器本体２の外表面に臨む層で、中間層１２や表面層１１で使用する材料と同様の材料を好適に用いることができる。また、中間層１２や表面層１１で使用する材料と異なる材料を用いてもよい。 Here, the surface layer 11 (peeling layer 21) is a layer that is heat-sealed with another film or the like. For example, when the multilayer sheet of the present invention is formed into the shape of the container body 2, the surface layer 11 is in contact with the contents and is a lid. It becomes a layer to be heat sealed with the sealant of the material 3. And like the opening of the easy-open container 1 described above, the lid member 3 and the heat-sealed portion are peeled from the container body 2 together with the lid member 3.
Further, the intermediate layer 12 (surface lower layer 22) constitutes a lower layer of the surface layer 11 (release layer 21), for example, the composition of the release layer 21, which flows by heat and uses the multilayer sheet of the present invention. This is a layer that forms a resin pool when the molded container body 2 is heat-sealed with the lid 3.
Furthermore, the base layer 13 (base material layer 23) is a main layer of the multilayer sheet 10 as described above, and constitutes the base material layer 23 of the container body 2 formed using the multilayer sheet of the present invention, for example. Is a layer.
The adhesive layer is a layer that bonds the base material layer 23 and the barrier layer. For example, urethane elastomer, styrene elastomer, maleic anhydride modified polyethylene, maleic anhydride modified polypropylene, ethylene vinyl acetate (EVA), etc. These materials can be suitably used. The thickness of the adhesive layer is preferably 10 μm or more and 50 μm or less, and more preferably 20 μm or more and 40 μm or less.
Further, the barrier layer is a layer using a resin that blocks oxygen, and by providing the barrier layer, the multilayer sheet 10 having an oxygen permeation blocking property can be provided. As the barrier layer, for example, materials such as ethylene vinyl alcohol (EVOH), polyvinylidene chloride (PVDC), and polyacrylonitrile (PAN) can be suitably used. The layer thickness of the barrier layer is preferably 10 μm or more and 210 μm or less, and more preferably 20 μm or more and 170 μm or less.
The outer surface layer is made of a material that is compatible with the adjacent layers. For example, the outer surface layer is a layer facing the outer surface of the container body 2 of the easy-open container 1 formed using the multilayer sheet of the present invention. The same material as that used for the surface layer 11 can be suitably used. Further, a material different from the material used for the intermediate layer 12 and the surface layer 11 may be used.
　上記（ｄ）～（ｆ）の構造のように、層構成中に複数の基材層が繰り返し設けられていてもよい。このうち、断面対象構造となる上記（ｅ）の構造が製膜安定性という理由から好適である。
　なお、上記構成に限定されるものではないが、中間層１２（表下層２２）が厚さ寸法が３５μｍ以上１００μｍ以下であり、１６５℃における損失正接tanδの値が０．１８以上０．５０以下であることで、ヒートシール時に樹脂だまりを形成し易くすることができる。
　同様に、蓋材３の層構成（外層３２／シール層３１）に限らず、外層３２／バリア層／シール層３１、あるいは第１外層３２／第２外層３２／シール層３１の構成などが挙げられる。 As in the structures (d) to (f) above, a plurality of base material layers may be repeatedly provided in the layer structure. Among these, the structure of the above (e) which becomes a cross-sectional object structure is suitable for the reason of film formation stability.
Although not limited to the above configuration, the thickness of the intermediate layer 12 (surface lower layer 22) is not less than 35 μm and not more than 100 μm, and the value of the loss tangent tan δ at 165 ° C. is not less than 0.18 and not more than 0.50. Therefore, it is possible to easily form a resin pool during heat sealing.
Similarly, not only the layer configuration (outer layer 32 / sealing layer 31) of the lid member 3, but also the configuration of the outer layer 32 / barrier layer / sealing layer 31, or the first outer layer 32 / second outer layer 32 / sealing layer 31, and the like. It is done.
　また、多層シート１０から易開封性容器１の容器本体２を成形し、容器本体２の剥離層２１が凝集剥離する態様としたが、これに限らず、例えば多層シートを重ね合わせてヒートシールし製袋するなどしてもよい。
　そして、易開封性容器１としても、例えば図９および図１０に示すように、容器本体２と蓋材３が開封するに際して、蓋材３のシール層３１が凝集剥離する構成としてもよい。
　すなわち、図９および図１０に示すように、易開封性容器１ａを構成する蓋材３のシール層３１が凝集破壊して、蓋材３が剥離するようにするには、シール層３１を構成する材料として、スチレングラフトプロピレン樹脂、接着性ポリオレフィン樹脂等を使用することができる。
　また、容器本体２の剥離層２１としては、ポリプロピレン系樹脂、ポリエチレン系樹脂等のポリオレフィン系樹脂やこれらのブレンド系を使用すればよい。
　このようなシール層３１を蓋材３に、剥離層２１を容器本体２に採用して両者をヒートシールした場合にあっては、両層２１，３１が融着する一方、開封の際には、応力に対して弱い蓋材３のシール層３１が凝集破壊して、開封が良好に行われる。 In addition, the container body 2 of the easy-open container 1 is formed from the multilayer sheet 10 and the release layer 21 of the container body 2 is agglomerated and peeled. However, the invention is not limited to this. For example, the multilayer sheets are stacked and heat-sealed. You may make a bag.
And as the easily openable container 1, as shown in FIG. 9 and FIG. 10, when the container main body 2 and the lid | cover material 3 open, the sealing layer 31 of the lid | cover material 3 is good also as a structure which peels.
That is, as shown in FIGS. 9 and 10, in order for the sealing layer 31 of the lid member 3 constituting the easy-open container 1 a to cohesively break and the lid member 3 to peel off, the sealing layer 31 is configured. As a material to be used, a styrene graft propylene resin, an adhesive polyolefin resin, or the like can be used.
Moreover, as the peeling layer 21 of the container body 2, a polyolefin resin such as a polypropylene resin or a polyethylene resin, or a blend system thereof may be used.
When such a sealing layer 31 is used for the lid 3 and the release layer 21 is used for the container body 2 and both are heat-sealed, the both layers 21 and 31 are fused, while opening. The sealing layer 31 of the lid 3 that is weak against stress is coherently broken, and the opening is performed well.
　そして、易開封性容器１ａを開封開始部４から開封するには、図９に示すように、蓋材３に対して図９の矢印方向に力Ｆがかかるようにすると、蓋材３のシール層３１の凝集剥離が進行していくことになる。そして、開封が樹脂溜まり部６に達したところにおいては、当該シール層３１の凝集剥離は、当該シール層３１とヒートシールされた容器本体２の剥離層２１に形成された樹脂溜まり６１の形状に沿って進行されることになる。
　蓋材３のシール層３１の凝集剥離がヒートシール部２６の切断位置にもなる内周縁近傍Ｘにまで達した後は、シール層３１の樹脂溜まり６３が切断されることにより、易開封性容器１における容器本体２と蓋材３との開封が容易に行われることになる。
　この図９および図１０に示す実施形態でも、上述した実施形態により奏される効果と略同等の効果を奏することができる。 And in order to open the easily openable container 1a from the opening start part 4, as shown in FIG. 9, when the force F is applied to the cover material 3 in the arrow direction of FIG. Aggregation peeling of the layer 31 will progress. When the opening reaches the resin reservoir 6, the cohesive separation of the seal layer 31 is formed in the shape of the resin reservoir 61 formed in the release layer 21 of the container body 2 heat-sealed with the seal layer 31. Will proceed along.
After the cohesive separation of the sealing layer 31 of the lid 3 reaches the vicinity of the inner peripheral edge X, which is also the cutting position of the heat seal portion 26, the resin reservoir 63 of the sealing layer 31 is cut, thereby easily opening the container. The container main body 2 and the lid member 3 in 1 are easily opened.
The embodiment shown in FIGS. 9 and 10 can achieve substantially the same effect as that obtained by the above-described embodiment.
　さらに、本発明にあっては、開封に際し、容器本体２の剥離層２１と蓋材３のシール層３１の両層が凝集破壊されて開封される場合も含む。さらに、容器本体２の剥離層２１と、表下層２２が同一部材である場合でも、前記同一部材が蓋材３のシール層３１とヒートシール可能で、蓋材３を開封する際に、蓋材３のシール層３１が凝集破壊する場合は、前述した本発明の効果が期待できるため、本発明に含まれる。
　その場合、図７～図１０で言えば、剥離層２１と表下層２２は、別層のように見えるが同一部材で、便宜的に、表下層２２の凝集破壊される部分（フランジ部２５の表面）を剥離層２１と示した構成とすればよい。
　さらには、多層シート１０から容器本体２を形成する場合に限らず、例えば多層シート１０をヒートシールして製袋するなど、ヒートシールにより樹脂溜まりを形成させる各種用途に利用することができる。 Furthermore, the present invention includes a case where both the peeling layer 21 of the container body 2 and the sealing layer 31 of the lid 3 are coherently broken and opened when opening. Further, even when the peeling layer 21 of the container body 2 and the front and lower layers 22 are the same member, the same member can be heat sealed with the sealing layer 31 of the lid member 3, and the lid member 3 is opened when the lid member 3 is opened. The case where the three sealing layers 31 cohesively break is included in the present invention because the above-described effects of the present invention can be expected.
In that case, in FIGS. 7 to 10, the peeling layer 21 and the upper and lower layers 22 look like separate layers but are the same member, and for convenience, a portion of the outer and lower layers 22 that is subject to cohesive failure (of the flange portion 25). The surface) may be configured as the release layer 21.
Furthermore, the present invention is not limited to the case where the container body 2 is formed from the multilayer sheet 10, but can be used for various applications in which a resin reservoir is formed by heat sealing, for example, the multilayer sheet 10 is heat-sealed to form a bag.
　また、本発明では、凝集剥離を前提とせず、界面剥離する構成などとしてもよい。
　界面剥離する構成では、例えば、ヒートシール部２６２の外周に外方に尖状に突出する開封開始部を形成するように、環状シール盤７に開封開始部形成部を形成してもよい。このように開封開始部形成部により開封開始部を設けることにより、界面剥離でも尖った開封開始部の先端から容易に開封できる。 Moreover, in this invention, it is good also as a structure etc. which do not presuppose cohesive peeling but interface peeling.
In the configuration where the interface is peeled off, for example, an opening start portion forming portion may be formed on the annular seal disc 7 so as to form an opening start portion protruding outwardly on the outer periphery of the heat seal portion 262. Thus, by providing an opening start part by an opening start part formation part, it can open easily from the front-end | tip of the opening start part sharpened also by interface peeling.
　また、凝集剥離される容器本体２の剥離層２１や蓋材３のシール層３１の構成材料も、前記した実施形態で示した例のほか、例えば、剥離層２１はポリプロピレンとエチレン・メタクリル酸共重合体やエチレン・テトラシクロドデセン共重合体のブレンド系、シール層３１は飽和共重合ポリエステル系樹脂を使用することができる。 In addition to the examples shown in the above-described embodiment, the constituent material of the release layer 21 of the container body 2 and the seal layer 31 of the lid member 3 to be agglomerated and peeled is, for example, a combination of polypropylene and ethylene / methacrylic acid. A saturated copolymerized polyester resin can be used for the polymer, the blend system of ethylene / tetracyclododecene copolymer, and the seal layer 31.
　なお、図２Ａ，図２Ｂおよび図３に示される構成の易開封性容器１を製造するにあっては、場合によっては、環状シール盤７の内周縁が接する位置に対応する部分に形成される樹脂溜まり部６のほか、当該環状シール盤７の外周縁が接する位置に対応する部分に樹脂溜まりが形成される場合であっても良い。外周縁に形成される樹脂溜まりより、内周縁に形成される樹脂溜まりの方が大きくなるため、良好な易開封性と高密封性が維持されることとなる。 In manufacturing the easy-open container 1 having the configuration shown in FIGS. 2A, 2B, and 3, depending on the case, it is formed at a portion corresponding to the position where the inner peripheral edge of the annular seal disc 7 contacts. In addition to the resin reservoir 6, a resin reservoir may be formed in a portion corresponding to a position where the outer peripheral edge of the annular seal disc 7 contacts. Since the resin reservoir formed at the inner peripheral edge is larger than the resin reservoir formed at the outer peripheral edge, good easy-openability and high sealing performance are maintained.
　また、ヒートシールする構成としては、環状シール盤７に限らず、ヒートシール部２６の形状に応じた形状のシール盤を利用してもよい。すなわち、多層シート１０の少なくとも１層が３５μｍ以上１００μｍ以下であり、当該１層を構成する材料が１６５℃における損失正接tanδの値が０．１８以上０．５０以下であれば、樹脂溜まり部６を形成できる。
　その他、本発明の実施における具体的な構造および形状等は、本発明の目的を達成できる範囲で他の構造等としてもよい。 In addition, the configuration for heat sealing is not limited to the annular seal disc 7, and a seal disc having a shape corresponding to the shape of the heat seal portion 26 may be used. That is, if at least one layer of the multilayer sheet 10 is 35 μm or more and 100 μm or less, and the material constituting the one layer has a loss tangent tan δ value at 165 ° C. of 0.18 or more and 0.50 or less, the resin reservoir 6 Can be formed.
In addition, the specific structure, shape, and the like in the implementation of the present invention may be other structures as long as the object of the present invention can be achieved.
　次に、実施例および比較例を挙げて本発明をさらに詳しく説明するが、本発明はこれらの実施例等の記載内容に何ら制約されるものではない。 Next, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to the description of these examples.
　［実施例１］
　下記に示すように、以下の層構成を示す多層シート１０を用いて易開封性容器１の容器本体２を成形し、全体形状を図２Ａ，図２Ｂ、また、開封開始部４の断面構成を図３に示す易開封性容器１を製造した。 [Example 1]
As shown below, the container body 2 of the easy-open container 1 is formed using a multilayer sheet 10 having the following layer structure, the overall shape is shown in FIGS. 2A and 2B, and the cross-sectional structure of the opening start portion 4 is shown. An easy-open container 1 shown in FIG. 3 was produced.
　（多層シート１０の製造）
　共押出成形により、以下の第一表面層／第一中間層／第一基層／第一接着層／バリア層／第二接着層／第二基層／外表層からなる、厚さが４００μｍの多層シート１０を成形した。
　　第一表面層：ポリプロピレン（７０質量％）＋エチレンアクリル酸エステル－無水マレイン酸共重合体（３０質量％）　（３０μｍ）
　　第一中間層：ポリプロピレン（７５質量％）＋ポリオレフィンエラストマー（２５質量％）　（６０μｍ）（tanδ＝０．３２）
　　第一基層：ポリプロピレン（８０質量％）＋ポリエチレン（２０質量％）　（１００μｍ）
　　第一接着層：ポリプロピレン（１５μｍ）
　　バリア層：ポリプロピレン（２０μｍ）
　　第二接着層：ポリプロピレン（１５μｍ）
　　第二基層：ポリプロピレン（８０質量％）＋ポリエチレン（２０質量％）　（１００μｍ）
　　外表層：ポリプロピレン（７５質量％）＋ポリオレフィンエラストマー（２５質量％）　（６０μｍ）の積層体 (Manufacture of multilayer sheet 10)
A multilayer sheet having a thickness of 400 μm comprising the following first surface layer / first intermediate layer / first base layer / first adhesive layer / barrier layer / second adhesive layer / second base layer / outer surface layer by coextrusion molding 10 was molded.
First surface layer: polypropylene (70% by mass) + ethylene acrylate-maleic anhydride copolymer (30% by mass) (30 μm)
First intermediate layer: polypropylene (75% by mass) + polyolefin elastomer (25% by mass) (60 μm) (tan δ = 0.32)
First base layer: polypropylene (80% by mass) + polyethylene (20% by mass) (100 μm)
First adhesive layer: Polypropylene (15 μm)
Barrier layer: Polypropylene (20 μm)
Second adhesive layer: polypropylene (15 μm)
Second base layer: polypropylene (80% by mass) + polyethylene (20% by mass) (100 μm)
Outer surface layer: laminate of polypropylene (75% by mass) + polyolefin elastomer (25% by mass) (60 μm)
　（容器本体２の構成）
　次に、上記多層シート１０を用いて、プラグアシスト真空成形により、４５ｍｍ×６０ｍｍ×２５ｍｍのフランジ付の容器本体２を成形した。なお、この容器本体２は、開口部２４に対して幅５ｍｍのフランジ部２５を有し、略長方形のトレー状となるように形成されている。
　このようにして得られた容器本体２の開口部２４周縁のフランジ部２５に対して、下記構成からなる多層フィルムを蓋材３として載置して、下記のシール条件を用い、また、環状シール盤として、図４～６に示した、傾斜面部７１と曲面部７２が全周に形成された環状シール盤（シールリング）の曲面部７２の曲率半径Ｒの大きさが異なるものを使用して、蓋材３を容器本体２のフランジ部２５に対してヒートシールして、上記実施形態の易開封性容器１を製造した。
　なお、この構成の容器本体２と蓋材３を使用すると、開封時は、容器本体２の剥離層２１の凝集破壊により剥離が進行する凝集剥離が行われる。 (Configuration of container body 2)
Next, a container body 2 with a flange of 45 mm × 60 mm × 25 mm was formed by plug-assisted vacuum forming using the multilayer sheet 10. The container body 2 has a flange portion 25 having a width of 5 mm with respect to the opening 24 and is formed to have a substantially rectangular tray shape.
A multilayer film having the following configuration is placed as the lid member 3 on the flange portion 25 at the periphery of the opening 24 of the container body 2 obtained as described above, and the following sealing conditions are used. 4 to 6 shown in FIGS. 4 to 6, the curved surface portion 72 of the annular sealing disk (seal ring) in which the inclined surface portion 71 and the curved surface portion 72 are formed on the entire circumference are used. The lid member 3 was heat-sealed with respect to the flange portion 25 of the container body 2 to manufacture the easy-open container 1 of the above embodiment.
In addition, when the container main body 2 and the lid | cover material 3 of this structure are used, the cohesive peeling which peeling progresses by the cohesive failure of the peeling layer 21 of the container main body 2 will be performed at the time of opening.
　（蓋材３の構成）
　　シール層３１：ポリエチレン（６０μｍ）
　　外層３２：ポリエチレンテレフタレート（ＰＥＴ）（１２μｍ）／ポリアミド（ナイロン）（１５μｍ）（ＰＥＴ／Ｎｙ／ＰＥの順） (Configuration of the lid 3)
Seal layer 31: polyethylene (60 μm)
Outer layer 32: polyethylene terephthalate (PET) (12 μm) / polyamide (nylon) (15 μm) (in order of PET / Ny / PE)
　（シール条件）
　　シール温度：　　２００℃
　　シール圧力：　　１９６０Ｎ（２００ｋｇｆ／個）
　　時間：　　１．１秒
　　ヒートシールの回数：　　１回 (Sealing conditions)
Sealing temperature: 200 ° C
Sealing pressure: 1960N (200kgf / piece)
Time: 1.1 seconds Number of heat seals: Once
　（環状シール盤の仕様）
　　シール幅Ｈ：　　３ｍｍ
　　傾斜角度θ（傾斜面部７１）：　　６°
　　Ｒ加工（曲面部７２）：　　０．３３Ｈ（１．０ｍｍＲ） (Specifications of annular seal panel)
Seal width H: 3mm
Inclination angle θ (inclined surface portion 71): 6 °
R processing (curved surface portion 72): 0.33H (1.0 mmR)
　［実施例２］
　実施例１において、多層シート１０（容器本体２）の中間層１２（表下層２２）の構成を下記のようにした以外は、実施例１と同様な方法を用いて、易開封性容器１を製造した。
　なお、この構成の容器本体２と蓋材３を使用すると、実施例１と同様、開封時は、容器本体２の剥離層２１の凝集破壊により剥離が進行する凝集剥離が行われる。
　（第一中間層の構成）
　第一中間層：ポリプロピレン（７０質量％）＋ポリオレフィンエラストマー（１５質量％）＋ポリエチレン（１５質量％）　（６０μｍ）（tanδ＝０．２３） [Example 2]
In Example 1, except that the configuration of the intermediate layer 12 (front lower layer 22) of the multilayer sheet 10 (container body 2) was as described below, the easy-open container 1 was prepared using the same method as in Example 1. Manufactured.
In addition, when the container main body 2 and the lid | cover material 3 of this structure are used, the cohesive peeling which peeling progresses by the cohesive failure of the peeling layer 21 of the container main body 2 is performed at the time of opening like Example 1. FIG.
(Configuration of the first intermediate layer)
First intermediate layer: polypropylene (70% by mass) + polyolefin elastomer (15% by mass) + polyethylene (15% by mass) (60 μm) (tan δ = 0.23)
　［実施例３］
　実施例１において、多層シート１０（容器本体２）の中間層１２（表下層２２）の構成を下記のようにした以外は、実施例１と同様な方法を用いて、易開封性容器１を製造した。
　なお、この構成の容器本体２と蓋材３を使用すると、実施例１と同様、開封時は、容器本体２の剥離層２１の凝集破壊により剥離が進行する凝集剥離が行われる。
　（第一中間層の構成）
　第一中間層：ポリプロピレン（８０質量％）＋ポリエチレン（２０質量％）　（６０μｍ）（tanδ＝０．１９） [Example 3]
In Example 1, except that the configuration of the intermediate layer 12 (front lower layer 22) of the multilayer sheet 10 (container body 2) was as described below, the easy-open container 1 was prepared using the same method as in Example 1. Manufactured.
In addition, when the container main body 2 and the lid | cover material 3 of this structure are used, the cohesive peeling which peeling progresses by the cohesive failure of the peeling layer 21 of the container main body 2 is performed at the time of opening like Example 1. FIG.
(Configuration of the first intermediate layer)
First intermediate layer: polypropylene (80% by mass) + polyethylene (20% by mass) (60 μm) (tan δ = 0.19)
　［比較例１］
　実施例１において、多層シート１０（容器本体２）の中間層１２（表下層２２）の構成を下記のようにした以外は、実施例１と同様な方法を用いて容器を製造した。
　（第一中間層の構成）
　第一中間層：ポリプロピレン（８２質量％）＋ポリエチレン（１８質量％）　（６０μｍ）（tanδ＝０．１４） [Comparative Example 1]
In Example 1, a container was produced using the same method as in Example 1 except that the configuration of the intermediate layer 12 (front lower layer 22) of the multilayer sheet 10 (container body 2) was as follows.
(Configuration of the first intermediate layer)
First intermediate layer: polypropylene (82% by mass) + polyethylene (18% by mass) (60 μm) (tan δ = 0.14)
　［比較例２］
　実施例１において、多層シート１０（容器本体２）の中間層１２（表下層２２）の構成を下記のようにした以外は、実施例１と同様な方法を用いて容器を製造した。
　（第一中間層の構成）
　第一中間層：ポリプロピレン（８２質量％）＋ポリオレフィンエラストマー（５質量％）＋ポリエチレン（１３質量％）　（６０μｍ）（tanδ＝０．１５） [Comparative Example 2]
In Example 1, a container was produced using the same method as in Example 1 except that the configuration of the intermediate layer 12 (front lower layer 22) of the multilayer sheet 10 (container body 2) was as follows.
(Configuration of the first intermediate layer)
First intermediate layer: polypropylene (82% by mass) + polyolefin elastomer (5% by mass) + polyethylene (13% by mass) (60 μm) (tan δ = 0.15)
　［試験例１］
　前記のようにして得られた実施例１～３および比較例１，２の開封強度、開封時の開封外感、および、内圧強度を下記の基準にて比較・評価した。結果を表１に示す。 [Test Example 1]
The opening strength, the unsealing feeling at the time of opening, and the internal pressure strength of Examples 1 to 3 and Comparative Examples 1 and 2 obtained as described above were compared and evaluated according to the following criteria. The results are shown in Table 1.
　（開封性）
　上記形状の易開封性容器１の蓋材３の角部をチャックで掴み、蓋材３の天面とチャックの角度を４５°にして引っ張った際の開封強度を測定した。開封強度の測定には、株式会社イマダ製のデジタルフォースゲージを用いた。測定は、５回実施して平均値を演算し、以下の２段階で評価した。
　　Ａ：開封強度が４．９Ｎ以上９．８Ｎ未満（０．５ｋｇｆ／開封口以上１．０ｋｇｆ／開封口以下）
　　Ｂ：開封強度が９．８Ｎ以上１４．７Ｎ以下（１．０ｋｇｆ／開封口以上１．５ｋｇｆ／開封口以下） (Openability)
The corner portion of the lid 3 of the easy-open container 1 having the above shape was gripped with a chuck, and the opening strength when the lid 3 was pulled at an angle of 45 ° with the top surface of the lid 3 was measured. For the measurement of the opening strength, a digital force gauge manufactured by Imada Co., Ltd. was used. The measurement was carried out five times, the average value was calculated, and evaluated in the following two stages.
A: Opening strength is 4.9 N or more and less than 9.8 N (0.5 kgf / opening port or more and 1.0 kgf / opening port or less)
B: Opening strength is 9.8 N to 14.7 N (1.0 kgf / opening port to 1.5 kgf / opening port)
　（内圧強度）
　易開封性容器に加圧空気を１．０±０．２リットル／ｍｉｎで注入し、当該容器が破裂したときの圧力（ＭＰａ）を測定した。試験は、破裂強度試験機（株式会社サン科学製）を用い、ｎ＝５で行った。内圧強度の評価は、以下の４段階で評価した。
　　Ａ：内圧強度が非常に高い。（０．１００ＭＰａ以上）
　　Ｂ：内圧強度が高い。（０．０６０ＭＰａ以上０．０９９ＭＰａ以下）
　　Ｃ：内圧強度がやや低い。（０．０３０以上０．０５９ＭＰａ以下）
　　Ｄ：内圧強度が低い。（０．０３ＭＰａ未満） (Internal pressure strength)
Pressurized air was injected into the easy-open container at 1.0 ± 0.2 liter / min, and the pressure (MPa) when the container burst was measured. The test was performed with n = 5 using a burst strength tester (manufactured by Sun Kagaku Co., Ltd.). The internal pressure strength was evaluated in the following four stages.
A: The internal pressure strength is very high. (0.100 MPa or more)
B: The internal pressure strength is high. (0.060 MPa to 0.099 MPa)
C: The internal pressure strength is slightly low. (0.030 to 0.059 MPa)
D: The internal pressure strength is low. (Less than 0.03 MPa)
　（結果）
Figure JPOXMLDOC01-appb-T000001
   (result)
Figure JPOXMLDOC01-appb-T000001
　表１に示すように、実施例１～実施例３の易開封性容器は、開封強度が適度であり、易開封性に優れるとともに、また、内圧強度も高く、高密封性を備えていた。
　従って、実施例１～実施例３の易開封性容器は、易開封性と高密封性を兼ね備えた容器であることが確認できた。さらには、実施例１～実施例３の易開封性容器の開封外観も、概ね良好であった。 As shown in Table 1, the easy-open containers of Examples 1 to 3 had moderate open strength, excellent openability, high internal pressure strength, and high sealability.
Therefore, it was confirmed that the easy-open containers of Examples 1 to 3 were easy-open and highly sealed. In addition, the unsealed appearance of the easy-open containers of Examples 1 to 3 was generally good.
　一方、シール部の内周縁近傍にコブ状の樹脂溜まり部が形成されない比較例１，２は、良好な開封外観を示すものの、シール強度（内圧強度）が高くなく高い密封性が得られなかった。
　従って、比較例で得られた易開封性容器は、易開封性と高密封性を兼ね備えたものではなく、実施例で得られた、高密封性と易開封性を兼ね備えた本発明の易開封性容器と比較すると劣るものであった。 On the other hand, Comparative Examples 1 and 2 in which the bump-shaped resin reservoir portion is not formed in the vicinity of the inner peripheral edge of the seal portion show a good opening appearance, but the seal strength (internal pressure strength) is not high and high sealing performance cannot be obtained. .
Therefore, the easy-open container obtained in the comparative example does not have both easy-openability and high-sealing property, and the easy-opening of the present invention that has both high-sealing property and easy-opening property obtained in the examples. It was inferior compared with the sexual container.
　［実施例１１］
　次に、環状シール盤７におけるＲ加工（曲面部７２）を異なる形状で形成したものを用い、下記の材料および方法により、全体形状を図２Ａ，図２Ｂに示す易開封性容器１を製造し、ヒートシールについて比較検討した。なお、環状シール盤７の断面図を図１１に示す。 [Example 11]
Next, an easy-open container 1 having an overall shape shown in FIGS. 2A and 2B is manufactured by using the following materials and methods using R processing (curved surface portion 72) formed in different shapes in the annular seal disc 7. The heat seal was compared and examined. A cross-sectional view of the annular seal disc 7 is shown in FIG.
　（環状シール盤の仕様）
　　シール幅Ｈ：　　１．５ｍｍ
　　傾斜角度θ（傾斜面部１１）：　　９°
　　Ｒ加工（曲面部１２）：　　０．６７Ｈ（１．０ｍｍＲ） (Specifications of annular seal panel)
Seal width H: 1.5mm
Inclination angle θ (inclined surface portion 11): 9 °
R processing (curved surface portion 12): 0.67H (1.0 mmR)
　（試験体：易開封性容器１）
　　（容器本体２１）
　共押出成形により、以下の第一表面層／第一中間層／第一基層／第一接着層／バリア層／第二接着層／第二基層／外表層からなる、厚さが４００μｍの多層シート１０を成形した。この多層シート１０を用いて、プラグアシスト真空成形により、４５ｍｍ×６０ｍｍ×２５ｍｍのフランジ付の容器本体２を成形した。なお、この容器本体２は、開口部２４に対して幅５ｍｍのフランジ部２５を有し、略長方形のトレー状となるように形成されている。
　　第一表面層：ポリプロピレン（７０質量％）＋エチレンアクリル酸エステル－無水マレイン酸共重合体（３０質量％）　（３０μｍ）
　　第一中間層：ポリプロピレン（７５質量％）＋ポリオレフィンエラストマー（２５質量％）　（６０μｍ）（tanδ＝０．３２）
　　第一基層：ポリプロピレン（８０質量％）＋ポリエチレン（２０質量％）　（１００μｍ）
　　第一接着層：ポリプロピレン（１５μｍ）
　　バリア層：ポリプロピレン（２０μｍ）
　　第二接着層：ポリプロピレン（１５μｍ）
　　第二基層：ポリプロピレン（８０質量％）＋ポリエチレン（２０質量％）　（１００μｍ）
　　外表層：ポリプロピレン（７５質量％）＋ポリオレフィンエラストマー（２５質量％）　（６０μｍ） (Test specimen: easy-open container 1)
(Container body 21)
A multilayer sheet having a thickness of 400 μm comprising the following first surface layer / first intermediate layer / first base layer / first adhesive layer / barrier layer / second adhesive layer / second base layer / outer surface layer by coextrusion molding 10 was molded. Using this multilayer sheet 10, a container body 2 with a flange of 45 mm × 60 mm × 25 mm was formed by plug-assisted vacuum forming. The container body 2 has a flange portion 25 having a width of 5 mm with respect to the opening 24 and is formed to have a substantially rectangular tray shape.
First surface layer: polypropylene (70% by mass) + ethylene acrylate-maleic anhydride copolymer (30% by mass) (30 μm)
First intermediate layer: polypropylene (75% by mass) + polyolefin elastomer (25% by mass) (60 μm) (tan δ = 0.32)
First base layer: polypropylene (80% by mass) + polyethylene (20% by mass) (100 μm)
First adhesive layer: Polypropylene (15 μm)
Barrier layer: Polypropylene (20 μm)
Second adhesive layer: polypropylene (15 μm)
Second base layer: polypropylene (80% by mass) + polyethylene (20% by mass) (100 μm)
Outer surface layer: polypropylene (75% by mass) + polyolefin elastomer (25% by mass) (60 μm)
　　（蓋材２２）
　　シール層３１：ポリエチレン（６０μｍ）
　　外層３２：ポリエチレンテレフタレート（ＰＥＴ）（１２μｍ）／ポリアミド（ナイロン）（１５μｍ）（ＰＥＴ／Ｎｙ／ＰＥの順） (Cover 22)
Seal layer 31: polyethylene (60 μm)
Outer layer 32: polyethylene terephthalate (PET) (12 μm) / polyamide (nylon) (15 μm) (in order of PET / Ny / PE)
　上記得られた容器本体２の開口部２４周縁のフランジ部２５に対して、上記蓋材３を載置して、下記のシール条件を用い、また、環状シール盤７としては、図２Ａ，図２Ｂに示したように、傾斜面部７１と曲面部７２が全周に形成された環状シール盤（シールリング）の曲面部７２の曲率半径Ｒの大きさが下記の形状のものを使用して、蓋材３を容器本体２のフランジ部２５に対してヒートシールして、易開封性容器１を製造した。
　なお、この構成の容器本体２と蓋材３を使用すると、開封時は、容器本体２の表面層２１の凝集破壊により剥離が進行する凝集剥離が行われる。 The lid member 3 is placed on the flange portion 25 at the periphery of the opening 24 of the container body 2 obtained as described above, and the following sealing conditions are used. As shown in 2B, the curved surface portion 72 of the annular seal disc (seal ring) in which the inclined surface portion 71 and the curved surface portion 72 are formed on the entire circumference has a curvature radius R of the following shape, The lid member 3 was heat-sealed with respect to the flange portion 25 of the container body 2 to manufacture the easy-open container 1.
In addition, when the container main body 2 and the lid | cover material 3 of this structure are used, the cohesive peeling which peeling progresses by the cohesive failure of the surface layer 21 of the container main body 2 will be performed at the time of opening.
　（シール条件）
　　シール温度：　　１９０℃
　　シール圧力：　　１５６８Ｎ（１６０ｋｇｆ／個）
　　時間：　　１．１秒
　　ヒートシールの回数：　　１回 (Sealing conditions)
Sealing temperature: 190 ° C
Sealing pressure: 1568N (160kgf / piece)
Time: 1.1 seconds Number of heat seals: Once
　［試験例２］
　前記のようにして得られた実施例１１の開封強度、および、内圧強度について以下に示すように測定し、評価した。結果を表２に示す。 [Test Example 2]
The opening strength and internal pressure strength of Example 11 obtained as described above were measured and evaluated as shown below. The results are shown in Table 2.
　（開封強度）
　上記形状の易開封性容器１の蓋材３の角部をチャックで掴み、蓋材３の天面とチャックの角度を４５°にして引っ張った際の開封強度を測定した。開封強度の測定には、株式会社イマダ製のデジタルフォースゲージを用いた。測定は、３回実施し、平均値を演算した。
　なお、実施例１１では、開封強度の平均値は、７．４５Ｎ（０．７６kgf）であった。
　　Ａ：開封強度が４．９Ｎ以上９．８６０Ｎ以下（０．５ｋｇｆ／開封口以上１．０ｋｇｆ／開封口以下）
　　Ｂ：開封強度が９．８Ｎ以上１４．７Ｎ以下（１．０ｋｇｆ／開封口以上１．５ｋｇｆ／開封口以下） (Opening strength)
The corner portion of the lid 3 of the easy-open container 1 having the above shape was gripped with a chuck, and the opening strength when the lid 3 was pulled at an angle of 45 ° with the top surface of the lid 3 was measured. For the measurement of the opening strength, a digital force gauge manufactured by Imada Co., Ltd. was used. The measurement was performed 3 times and the average value was calculated.
In Example 11, the average value of the opening strength was 7.45 N (0.76 kgf).
A: Opening strength is 4.9 N or more and 9.860 N or less (0.5 kgf / opening port or more and 1.0 kgf / opening port or less)
B: Opening strength is 9.8 N to 14.7 N (1.0 kgf / opening port to 1.5 kgf / opening port)
　（内圧強度）
　易開封性容器に加圧空気を１．０±０．２リットル／ｍｉｎで注入し、当該容器が破裂したときの圧力（ＭＰａ）を測定した。試験は、破裂強度試験機（株式会社サン科学製）を用い、ｎ＝３で行った。
　なお、実施例１１の内圧強度の平均値は、０．１８９ＭＰａであった。
　　Ａ：内圧強度が非常に高い。（０．１０ＭＰａ以上）
　　Ｂ：内圧強度が高い。（０．０６０ＭＰａ以上０．０９９ＭＰａ以下） (Internal pressure strength)
Pressurized air was injected into the easy-open container at 1.0 ± 0.2 liter / min, and the pressure (MPa) when the container burst was measured. The test was performed with n = 3 using a burst strength tester (manufactured by Sun Kagaku Co., Ltd.).
In addition, the average value of the internal pressure strength of Example 11 was 0.189 MPa.
A: The internal pressure strength is very high. (0.10 MPa or more)
B: The internal pressure strength is high. (0.060 MPa to 0.099 MPa)
　［実施例１２］
　実施例１１において、第一中間層および外表層を、ポリプロピレン（７０質量％）＋ポリオレフィンエラストマー（１５質量％）＋ポリエチレン（１５質量％）（tanδ＝０．２３）とした以外は、実施例１１と同様な方法を用いて、易開封性容器２０を製造した。
　そして、実施例１１と同様に開封強度および内圧強度を測定し、上記評価方法で評価した。結果を表２に示す。実施例１２の開封強度の平均値は４．３１Ｎ（０．４４kgf）で、内圧強度の平均値は０．０９６ＭＰａであった。 [Example 12]
In Example 11, Example 11 except that the first intermediate layer and the outer surface layer were polypropylene (70% by mass) + polyolefin elastomer (15% by mass) + polyethylene (15% by mass) (tan δ = 0.23). The easy-open container 20 was manufactured using the same method.
Then, the unsealing strength and the internal pressure strength were measured in the same manner as in Example 11 and evaluated by the above evaluation method. The results are shown in Table 2. The average value of the opening strength of Example 12 was 4.31 N (0.44 kgf), and the average value of the internal pressure strength was 0.096 MPa.
　［実施例１３］
　実施例１１において、第一中間層および外表層を、ポリプロピレン（８５質量％）＋ポリエチレン（１５質量％）（tanδ＝０．１８）とした以外は、実施例１１と同様な方法を用いて、易開封性容器１を製造した。
　そして、実施例１１と同様に開封強度および内圧強度を測定し、上記評価方法で評価した。結果を表２に示す。実施例１２の開封強度の平均値は４．３１Ｎ（０．４４kgf）で、内圧強度は０．０９６ＭＰａであった。
　（結果）
Figure JPOXMLDOC01-appb-T000002
   [Example 13]
In Example 11, using the same method as in Example 11 except that the first intermediate layer and the outer surface layer were polypropylene (85% by mass) + polyethylene (15% by mass) (tan δ = 0.18), An easy-open container 1 was produced.
Then, the unsealing strength and the internal pressure strength were measured in the same manner as in Example 11 and evaluated by the above evaluation method. The results are shown in Table 2. The average value of the opening strength of Example 12 was 4.31 N (0.44 kgf), and the internal pressure strength was 0.096 MPa.
(result)
Figure JPOXMLDOC01-appb-T000002
　［実施例１４］
　実施例１１において、環状シール盤７のシール幅を２．０ｍｍとした以外は、実施例１１と同様な方法を用いて、易開封性容器１を製造した。
　そして、実施例１１と同様に内圧強度を測定し、上記評価方法で評価した。結果を表３に示す。実施例１４の内圧強度の平均値は０．０６７ＭＰａであった。 [Example 14]
In Example 11, the easy-open container 1 was manufactured using the same method as in Example 11 except that the seal width of the annular seal disc 7 was set to 2.0 mm.
And the internal pressure intensity | strength was measured similarly to Example 11, and it evaluated by the said evaluation method. The results are shown in Table 3. The average value of the internal pressure strength of Example 14 was 0.067 MPa.
　［実施例１５］
　実施例１２において、環状シール盤７のシール幅を２．０ｍｍとし、曲率半径Ｒを０．５Ｈ（１．０ｍｍＲ）とした以外は、実施例１２と同様な方法を用いて、易開封性容器１を製造した。
　そして、実施例１１と同様に内圧強度を測定し、上記評価方法で評価した。結果を表３に示す。実施例１５の内圧強度の平均値は０．０７９ＭＰａであった。 [Example 15]
In Example 12, an easily openable container was used in the same manner as in Example 12 except that the seal width of the annular seal disc 7 was 2.0 mm and the radius of curvature R was 0.5H (1.0 mmR). 1 was produced.
And the internal pressure intensity | strength was measured similarly to Example 11, and it evaluated by the said evaluation method. The results are shown in Table 3. The average value of the internal pressure strength of Example 15 was 0.079 MPa.
　（結果）
Figure JPOXMLDOC01-appb-T000003
   (result)
Figure JPOXMLDOC01-appb-T000003
　本発明の多層シートは、ヒートシールにより高密封性と易開封性を併せ持っており、例えば、レトルト食品等の各種食品や薬品、化粧品等に包装容器として広く利用することができるものである。 The multilayer sheet of the present invention has both high sealing properties and easy opening properties by heat sealing, and can be widely used as packaging containers for various foods such as retort foods, medicines, cosmetics, and the like.
　　　１，１ａ　　容器である易開封性容器
　　　２　　容器本体
　　　３　　蓋材
　　　７　　シール盤である環状シール盤
　　　７Ａ　シール部
　　１０　　多層シート
　　１１　　剥離層として機能し得る表面層
　　１２　　表下層として機能し得る中間層
　　１３　　基材層として機能し得る基層
　　２１　　剥離層
　　２２　　表下層
　　２３　　基材層
　　２４　　開口部
　　２５　　フランジ部
　　３１　　シーラント層としてのシール層
　　３２　　基材層としての外層
　　７０　　シール装置
　　７１　　斜面部としての傾斜面部
　　７２　　曲面部 DESCRIPTION OF SYMBOLS 1,1a Easy-open container which is a container 2 Container body 3 Lid material 7 Annular seal board which is a seal board 7A Seal part 10 Multilayer sheet 11 Surface layer which can function as peeling layer 12 Intermediate layer which can function as surface lower layer 13 Base Base layer that can function as a material layer 21 Peel layer 22 Surface layer 23 Base material layer 24 Opening portion 25 Flange portion 31 Seal layer as sealant layer 32 Outer layer as base material layer 70 Sealing device 71 Inclined surface portion as slope portion 72 Curved surface portion

Claims (17)

  1. 　３層以上の積層構造を有する多層シートであって、
    　少なくとも１層の厚さ寸法が３５μｍ以上１００μｍ以下であり、当該１層を構成する材料が１６５℃における損失正接tanδの値が０．１８以上０．５０以下であることを特徴とする多層シート。     A multilayer sheet having a laminated structure of three or more layers,
    A multilayer sheet, wherein the thickness of at least one layer is 35 μm or more and 100 μm or less, and the material constituting the one layer has a loss tangent tan δ value at 165 ° C. of 0.18 or more and 0.50 or less.
  2. 　請求項１に記載の多層シートであって、
    　前記の材料からなる層が表面層ではない
    　ことを特徴とする多層シート。     The multilayer sheet according to claim 1,
    A multilayer sheet, wherein the layer made of the material is not a surface layer.
  3. 　請求項１または請求項２に記載の多層シートであって、
    　前記の材料からなる層が表面層に隣接した層である
    　ことを特徴とする多層シート。     The multilayer sheet according to claim 1 or 2,
    A multilayer sheet, wherein the layer made of the material is a layer adjacent to the surface layer.
  4. 　剥離層、表下層、基材層をこれらの順で備えた多層シートであって、
    　前記表下層は、
    　厚さ寸法が３５μｍ以上１００μｍ以下であり、
    　１６５℃における損失正接tanδの値が０．１８以上０．５０以下である
    　ことを特徴とする多層シート。     A multilayer sheet comprising a release layer, a surface lower layer, and a base material layer in this order,
    The surface layer is
    The thickness dimension is 35 μm or more and 100 μm or less,
    The multilayer sheet, wherein the value of loss tangent tan δ at 165 ° C. is 0.18 or more and 0.50 or less.
  5. 　請求項４に記載の多層シートであって、
    　バリア層をさらに備えている
    　ことを特徴とする多層シート。     The multilayer sheet according to claim 4,
    A multilayer sheet, further comprising a barrier layer.
  6. 　請求項１から請求項５までのいずれか一項に記載の多層シートであって、
    　厚さ寸法が、２００μｍ以上２０００μｍ以下である
    　ことを特徴とする多層シート。     A multilayer sheet according to any one of claims 1 to 5,
    A multilayer sheet, wherein the thickness dimension is 200 μm or more and 2000 μm or less.
  7. 　請求項１から請求項６までのいずれか一項に記載の多層シートを用いて成形してなる
    　ことを特徴とする加工物。     A processed product formed by using the multilayer sheet according to any one of claims 1 to 6.
  8. 　請求項７に記載の加工物であって、
    　前記多層シートを加熱により成形してなる
    　ことを特徴とする加工物。     The workpiece according to claim 7,
    A processed product obtained by forming the multilayer sheet by heating.
  9. 　請求項１から請求項６までのいずれか一項に記載の多層シートを用いて成形してなる
    　ことを特徴とする容器。     A container formed by using the multilayer sheet according to any one of claims 1 to 6.
  10. 　請求項９に記載の容器であって、
    　被包装物収納用の開口部周縁から外側に突設されるフランジ部を有する容器本体を備えている
    　ことを特徴とする容器。     A container according to claim 9,
    A container main body having a flange portion projecting outward from a periphery of an opening for storing an object to be packaged.
  11. 　請求項９または請求項１０に記載の容器であって、
    　前記容器本体の形状は、カップ状あるいはトレー状である
    　ことを特徴とする容器。     A container according to claim 9 or claim 10, wherein
    The container body has a cup shape or a tray shape.
  12. 　蓋材が容器本体のフランジ部において接着された包装容器であって、
    　前記容器本体が請求項９から請求項１１までのいずれか一項に記載の容器であることを特徴とする包装容器。     A packaging container in which a lid is bonded at the flange portion of the container body,
    The said container main body is a container as described in any one of Claim 9-11, The packaging container characterized by the above-mentioned.
  13. 　請求項１２に記載の包装容器を製造する製造方法であって、
    　前記容器本体のフランジ部上面に蓋材を重ね、
    　前記フランジ部上面に対して、内周縁にＲ加工されて断面が曲面状の曲面部が形成された環状シール盤であって、外周縁が当該環状シール盤の先端より蓋材に遅れて接するようにされた形状を、少なくとも一部に有する環状シール盤を前記蓋材上部から押圧し、
    　前記フランジ部の前記環状シール盤の内周縁が接する位置の近傍に、前記容器本体の表面にコブ状の樹脂溜まり部を形成しながら、前記フランジ部に現れる前記容器本体と、前記蓋材とを環状にヒートシールする
    　ことを特徴とする包装容器の製造方法。     A manufacturing method for manufacturing the packaging container according to claim 12,
    Overlay the lid material on the upper surface of the flange portion of the container body,
    An annular seal disc in which a curved surface portion having a curved cross section is formed on the inner peripheral edge with respect to the upper surface of the flange portion so that the outer peripheral edge comes in contact with the lid material later than the tip of the annular seal disc. Pressing an annular sealing disc having at least a part of the shape formed from the top of the lid,
    In the vicinity of the position where the inner peripheral edge of the annular sealing plate of the flange portion is in contact, the container main body that appears on the flange portion and the lid member are formed while forming a bump-shaped resin reservoir on the surface of the container main body. A method for manufacturing a packaging container, characterized by heat-sealing in an annular shape.
  14. 　請求項１３に記載の包装容器の製造方法であって、
    　前記コブ状の樹脂溜まり部が容器本体の表面の少なくとも２層の構成樹脂からなる
    　ことを特徴とする包装容器の製造方法。     It is a manufacturing method of the packaging container according to claim 13,
    The manufacturing method of a packaging container, wherein the bump-shaped resin reservoir is made of at least two layers of resin on the surface of the container body.
  15. 　請求項１４に記載の包装容器の製造方法であって、
    　前記コブ状の樹脂溜まり部がさらに蓋材のシール層の構成樹脂を含む
    　ことを特徴とする包装容器の製造方法。     It is a manufacturing method of the packaging container according to claim 14,
    The manufacturing method of a packaging container, wherein the bump-shaped resin reservoir further contains a constituent resin of a sealing layer of a lid.
  16. 　請求項１３から請求項１５までのいずれか一項に記載の包装容器の製造方法であって、
    　前記環状シール盤は、環状のシール部と基盤部とを備え、
    　前記シール部は、内周縁に曲面加工された曲面部と、当該曲面部に連続して設けられ外周縁側に被ヒートシール面に対して傾斜する斜面部とを備え、
    　前記曲面部の曲率半径Ｒは、前記内周縁から外周縁までを距離Ｈとしたとき、０．５Ｈより大きい
    　ことを特徴とする包装容器の製造方法。     A method for manufacturing a packaging container according to any one of claims 13 to 15,
    The annular seal disc includes an annular seal portion and a base portion,
    The seal portion includes a curved surface portion that is curved on the inner peripheral edge, and a slope portion that is provided continuously with the curved surface portion and is inclined with respect to the heat-sealed surface on the outer peripheral edge side,
    The method of manufacturing a packaging container, wherein a radius of curvature R of the curved surface portion is larger than 0.5H when the distance H from the inner peripheral edge to the outer peripheral edge is taken as a distance H.
  17. 　請求項１３から請求項１６までのいずれか一項に記載の包装容器の製造方法により製造された
    　ことを特徴とする包装容器。     It is manufactured by the manufacturing method of the packaging container as described in any one of Claim 13 to 16. The packaging container characterized by the above-mentioned.
PCT/JP2013/078773 2012-10-25 2013-10-24 Multilayer sheet, workpiece, container, packaging container, and packaing container manufacturing method WO2014065354A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000273408A (en) * 1999-03-19 2000-10-03 Nitto Denko Corp Double-sided tacky sheets for punching treatment
JP2004167774A (en) * 2002-11-19 2004-06-17 Idemitsu Unitech Co Ltd Multi-layer sheet, container and easily openable package
WO2005030466A1 (en) * 2003-09-30 2005-04-07 Sekisui Chemical Co., Ltd. Multi-layer sheet
WO2009123286A1 (en) * 2008-04-03 2009-10-08 東セロ株式会社 Heat-fusible multilayered film

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000273408A (en) * 1999-03-19 2000-10-03 Nitto Denko Corp Double-sided tacky sheets for punching treatment
JP2004167774A (en) * 2002-11-19 2004-06-17 Idemitsu Unitech Co Ltd Multi-layer sheet, container and easily openable package
WO2005030466A1 (en) * 2003-09-30 2005-04-07 Sekisui Chemical Co., Ltd. Multi-layer sheet
WO2009123286A1 (en) * 2008-04-03 2009-10-08 東セロ株式会社 Heat-fusible multilayered film

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