JP2007301751A - Plastic bag and its manufacturing method - Google Patents

Plastic bag and its manufacturing method Download PDF

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Publication number
JP2007301751A
JP2007301751A JP2006130198A JP2006130198A JP2007301751A JP 2007301751 A JP2007301751 A JP 2007301751A JP 2006130198 A JP2006130198 A JP 2006130198A JP 2006130198 A JP2006130198 A JP 2006130198A JP 2007301751 A JP2007301751 A JP 2007301751A
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JP
Japan
Prior art keywords
port
mold
heating
welded
shaping
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
JP2006130198A
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Japanese (ja)
Inventor
Tsunemi Yoshioka
常己 吉岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hanshin Kasei Kogyo Co Ltd
Original Assignee
Hanshin Kasei Kogyo Co Ltd
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 Hanshin Kasei Kogyo Co Ltd filed Critical Hanshin Kasei Kogyo Co Ltd
Priority to JP2006130198A priority Critical patent/JP2007301751A/en
Publication of JP2007301751A publication Critical patent/JP2007301751A/en
Withdrawn legal-status Critical Current

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    • 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
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5326—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially flat
    • B29C66/53261—Enclosing tubular articles between substantially flat elements
    • B29C66/53262—Enclosing spouts between the walls of bags, e.g. of medical bags
    • B29C66/53263—Enclosing spouts between the walls of bags, e.g. of medical bags said spouts comprising wings, e.g. said spouts being of ship-like or canoe-like form to avoid leaks in the corners
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1412—Infrared [IR] radiation
    • B29C65/1422—Far-infrared radiation [FIR]
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface direct heating of the surfaces 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
    • 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
    • B29C65/02—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
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/26—Hot fluid
    • 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
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • 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
    • B29C66/1122—Single lap to lap joints, i.e. overlap 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
    • B29C66/347—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients
    • B29C66/3472—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients in the plane of the joint, e.g. along the joint line in the plane of the joint or perpendicular to the joint line in the plane of 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
    • B29C66/50—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
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5326—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially flat
    • B29C66/53261—Enclosing tubular articles between substantially flat elements
    • B29C66/53262—Enclosing spouts between the walls of bags, e.g. of medical bags
    • 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
    • B29C66/81431—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 cavity, e.g. a groove
    • 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
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • 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
    • B29C66/91—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
    • B29C66/91935—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 lower 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
    • B29C66/70—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
    • B29C66/70—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
    • 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
    • B29C66/81423—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 concave
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7148—Blood bags, medical bags

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Plasma & Fusion (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a plastic bag wherein a plastic laminate is subjected to heat sealing and a port for a mouth cock is welded to the heat-sealed plastic laminate, which is free from occurrence of a pinhole in the area where the port is welded. <P>SOLUTION: In the manufacturing method of the plastic bag (1A), a port having a diametrically expanded part having an diametrically expanded part having an almost oval cross section is used in a circular pipe-shaped port body as the circular pipe-shaped port body as the port (2) and, in inserting the port body in the port insertion hole (12c) of a bag body to weld the same, a heat-sealing mold assembly, which comprises a heating mold having a two-split structure having a port part heating surface having a specific cross-sectional shape, wherein minor arcs are combined, is used as a heat-sealing mold assembly for welding the port. Then, the folded-back part (P) formed to the port welding part (12b) by pressing a heating mold is bent into an obtuse angle shape to prevent the folded-back part (P) from becoming thin-walled. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、プラスチックバッグの製造方法に関するものであり、詳しくは、医療用や医薬品用のプラスチックバッグであって、インフレーションチューブ等のプラスチックシート積層体にヒートシールを施して成り且つヒートシール部に口栓用のポートが溶着されたプラスチックバッグの製造方法に関するものである。   The present invention relates to a method of manufacturing a plastic bag, and more particularly, to a medical or pharmaceutical plastic bag, which is formed by heat-sealing a plastic sheet laminate such as an inflation tube, and has a mouth in a heat-sealing part. The present invention relates to a method for manufacturing a plastic bag having a stopper port welded thereto.

医療用や医薬品用のプラスチックバッグは、ヒートシール装置を使用し、例えば、インフレーションチューブ等の帯状のプラスチックシート積層体にヒートシールを施すことにより製造される。そして、バッグ本体のトップシール部には、液状物を充填、排出するためのポートが加熱溶着される。
特開平７−２６５３７８号公報 Medical and pharmaceutical plastic bags are manufactured by using a heat seal device and heat-sealing a strip-shaped plastic sheet laminate such as an inflation tube. A port for filling and discharging the liquid material is heat-welded to the top seal portion of the bag body.
JP-A-7-265378

図１２は、従来の製造方法により得られるプラスチックバッグのポート溶着部を示す平面図およびポート溶着部をXI−XI線に沿って破断した断面図である。上記のプラスチックバッグの製造においては、図１２（ａ）に示す様に、トップシール部（１２）にポート挿入穴（１２ｃ）が形成されたバック本体（１）をヒートシールにより製造した後、ポート（２Ｂ）の円形パイプ状のポート本体をポート挿入穴（１２ｃ）に挿入して溶着する。   FIG. 12: is the top view which shows the port weld part of the plastic bag obtained by the conventional manufacturing method, and sectional drawing which fractured | ruptured the port weld part along the XI-XI line. In the manufacture of the plastic bag, as shown in FIG. 12A, after the back body (1) having the port insertion hole (12c) formed in the top seal portion (12) is manufactured by heat sealing, The circular pipe-shaped port body (2B) is inserted into the port insertion hole (12c) and welded.

ポート（２Ｂ）の溶着においては、図１２（ｂ）に示す様に、２分割構造の溶着用の加熱金型（８１Ｂ）（ポート溶着用ヒートシール金型装置）をトップシール部（１２）の両面から押し付け、ポート挿入穴（１２ｃ）を形成している２枚のプラスチックシート（１ｓ）をポート本体の外周に溶着する。なお、ポート（２Ｂ）の溶着に使用される加熱金型（８１Ｂ）は、ポート挿入穴（１２ｃ）の両側部分に当接する２つのシート部加熱面と、これらシート部加熱面の間に設けられてポート挿入穴（１２ｃ）のポート本体挿入部分に当接する半円筒状のポート部加熱面とを備え、ポート部加熱面は、加熱金型（８１Ｂ）の型閉状態にてポート本体の中心線に直交して断面視した場合、ポート本体外周面の半径よりもプラスチックシート（１ｓ）の厚さ分だけ大きな半径で且つその中心が加熱金型（８１Ｂ）のパーティング面の延長上にあるポート本体の中心と同心の円弧状に形成されている。図１２において、符号（１０）はプラスチックシート（１ｓ）の積層体を示し、符号（１２ｂ）は加熱金型によって溶着された溶着部を示す。   In the welding of the port (2B), as shown in FIG. 12 (b), the heating mold (81B) (port welding heat seal mold apparatus) having a two-part structure is attached to the top seal portion (12). Pressing from both sides, two plastic sheets (1s) forming the port insertion hole (12c) are welded to the outer periphery of the port body. The heating mold (81B) used for welding the port (2B) is provided between the two sheet portion heating surfaces that are in contact with both side portions of the port insertion hole (12c) and these sheet portion heating surfaces. A semi-cylindrical port portion heating surface that abuts the port body insertion portion of the port insertion hole (12c), and the port portion heating surface is a center line of the port body when the heating mold (81B) is closed. When the cross-sectional view is orthogonal to the port, the port has a radius larger than the radius of the outer peripheral surface of the port body by the thickness of the plastic sheet (1s) and the center thereof is on the extension of the parting surface of the heating mold (81B). It is formed in an arc shape concentric with the center of the main body. In FIG. 12, the code | symbol (10) shows the laminated body of a plastic sheet (1s), and the code | symbol (12b) shows the welding part welded by the heating metal mold | die.

ところで、従来のプラスチックバッグの製造方法によれば、図１２（ａ）に示す様に、トップシール部（１２）にポート（２Ｂ）を溶着した際、溶着部（１２ｂ）の平面状の部位とポート（２Ｂ）のポート本体に溶着した部位との切返し部分（Ｐ）においてピンホールが発生し易いと言う問題がある。   By the way, according to the conventional method for manufacturing a plastic bag, as shown in FIG. 12A, when the port (2B) is welded to the top seal portion (12), the planar portion of the welded portion (12b) There is a problem that pinholes are likely to occur at the turn-over portion (P) between the port (2B) and the portion welded to the port body.

すなわち、図１２（ｂ）に示す様に、ポート溶着用の加熱金型（８１Ｂ）においては、ポート本体の中心線に直交して断面視した場合、半円筒状のポート部加熱面の彫込み口が略直角の角部に形成されている。従って、加熱金型（８１Ｂ）を型閉した場合、ポート部加熱面の彫込み口である上記のエッジ部によるプラスチックシート（１ｓ）の押え付けにより、トップシール部（１２）において各プラスチックシート（１ｓ）同士が平面状に溶着された部位と、各プラスチックシート（１ｓ）がポート本体半周面に溶着された部位との切返し部分（Ｐ）は、略直角に折り曲げられた状態に屈曲し、しかも、薄肉化する傾向がある。その結果、ポート本体の長手方向に沿った切返し部分（Ｐ）においては、溶着後の収縮過程あるいは製造後の取扱中にピンホールが発生する場合がある。   That is, as shown in FIG. 12 (b), in the heating mold (81B) for port welding, the semi-cylindrical port portion heating surface is engraved when viewed in cross-section perpendicular to the center line of the port body. The mouth is formed at a substantially right corner. Therefore, when the heating mold (81B) is closed, the plastic sheet (1s) is pressed by the edge portion which is the engraving port of the port portion heating surface, and each plastic sheet ( 1 s) the part where the plastic sheets (1 s) are welded to each other and the part where each plastic sheet (1 s) is welded to the half surface of the port body is bent into a substantially bent state, and , Tend to thin. As a result, pinholes may occur during the shrinking process after welding or during handling after manufacturing at the turn-over portion (P) along the longitudinal direction of the port body.

本発明は、上記の実情に鑑みてなされたものであり、その目的は、インフレーションチューブ等のプラスチックシート積層体にヒートシールを施して成り且つヒートシール部に口栓用のポートが溶着されたプラスチックバッグの製造方法であって、ポート溶着部におけるピンホールの発生を確実に防止し得るプラスチックバッグの製造方法を提供することにある。   The present invention has been made in view of the above circumstances, and an object thereof is a plastic formed by heat-sealing a plastic sheet laminate such as an inflation tube and having a plug port welded to the heat-sealed portion. An object of the present invention is to provide a method for manufacturing a plastic bag, which can reliably prevent the occurrence of pinholes at a port weld.

上記の課題を解決するため、本発明では、バッグ本体のヒートシール部に形成されたポート挿入穴にポート本体を挿入して溶着する際、ポートとして、断面が劣弧を組み合わせて成る略楕円形に整形された厚肉の円筒状断面の拡径部をポート本体の一部に有する特定のポートを使用し、かつ、ポートを溶着するためのヒートシール金型装置として、半円筒状のポート部加熱面をそれぞれ有する２分割構造の加熱金型であって、ポート部加熱面が特定の劣弧に形成され且つ対向するシート部加熱面が特定の距離だけ離間する加熱金型から成るヒートシール金型装置を使用する。そして、加熱金型の押え付けによってポート溶着部に形成される切返し部分、すなわち、各プラスチックシート同士の平面状に溶着された部位と各プラスチックシートのポート本体半周面に溶着された部位との切返し部分を鈍角状に屈曲させ、当該切返し部分における薄肉化を防止する様にした。   In order to solve the above problems, in the present invention, when the port body is inserted into the port insertion hole formed in the heat seal portion of the bag body and welded, the port has a substantially elliptical shape with a cross section combined with a subarc. A semi-cylindrical port part is used as a heat seal mold apparatus for welding a port using a specific port having a thick cylindrical cross-section enlarged diameter part formed in a part of the port body. A heat-sealing die comprising a heating die having a two-part structure each having a heating surface, wherein the port portion heating surface is formed in a specific subarc and the opposing sheet portion heating surfaces are separated by a specific distance Use a mold device. And the turning part formed in the port welding part by pressing of the heating mold, that is, the turning part between the part welded in a flat shape between the plastic sheets and the part welded to the half surface of the port body of each plastic sheet The part was bent at an obtuse angle to prevent thinning at the cut-back part.

すなわち、本発明の要旨は、プラスチックシート積層体にヒートシールを施して成るバッグ本体と、当該バック本体のヒートシール部に溶着された口栓用のポートとを備えたプラスチックバッグの製造方法であって、ポートとして、円形パイプ状のポート本体の一部に厚肉の拡径部を有し且つポート本体の中心線に直交して断面視した場合に拡径部が２つの同一の劣弧から成る略楕円形状に整形されたポートを使用すると共に、バッグ本体の１つのヒートシール部に形成されたポート挿入穴にポート本体を挿入してポート溶着用ヒートシール金型装置により溶着するに当たり、ポート溶着用ヒートシール金型装置として、相対的に又は相互に接近離間可能な溶着用の２つの加熱金型から成る２分割構造を備え、これら加熱金型が、各々、ポート挿入穴を構成するプラスチックシートのポート本体挿入部分の両側部分に当接する平坦な一対のシート部加熱面と、これらシート部加熱面の間に設けられ且つポート挿入穴を構成するプラスチックシートのポート本体挿入部分に当接する半円筒状のポート部加熱面とから構成され、かつ、ポート溶着の際に加熱金型を型閉した状態においてポート本体の中心線に直交して断面視した場合、各ポート部加熱面が、プラスチックシートの厚さの０．８〜１．１倍に相当する距離だけ加熱金型のパーティング面に対して他方のポート部加熱面側へ中心がずれ且つポート本体の拡径部の半径よりもずれの距離だけ半径が大きな劣弧に形成され、対向するシート部加熱面が、ずれの距離の２倍だけ離間する様に設定された金型装置を使用し、ポート本体の拡径部の長径を加熱金型のパーティングラインに揃え且つポート挿入穴を構成する２枚のプラスチックシートシートによって拡径部を挟み込んだ状態でポート本体を溶着することを特徴とするプラスチックバッグの製造方法に存する。   That is, the gist of the present invention is a method for manufacturing a plastic bag comprising a bag body formed by heat-sealing a plastic sheet laminate and a port for a plug welded to a heat seal portion of the back body. As a port, a part of a circular pipe-shaped port body has a thickened diameter-enlarged portion, and when the cross-sectional view is orthogonal to the center line of the port body, the enlarged-diameter portion is formed from two identical subarcs. When using the port shaped into a substantially oval shape, the port body is inserted into the port insertion hole formed in one heat seal part of the bag body, and the port is welded by the heat sealing mold device for port welding. A welding heat seal mold apparatus is provided with a two-part structure composed of two heating molds that can be welded relatively or close to and away from each other. A pair of flat sheet portion heating surfaces abutting on both sides of the port body insertion portion of the plastic sheet constituting the insertion hole, and a plastic sheet port body provided between the sheet portion heating surfaces and constituting the port insertion hole Each port is composed of a semi-cylindrical port portion heating surface that abuts the insertion portion, and when viewed in cross-section perpendicular to the center line of the port body when the heating mold is closed during port welding. The part heating surface is shifted to the other port part heating surface side with respect to the parting surface of the heating mold by a distance corresponding to 0.8 to 1.1 times the thickness of the plastic sheet, and the port body is expanded. Using a mold device that is formed in a subarc having a radius larger than the radius of the radius, and the opposite sheet heating surface is separated by twice the gap distance, A plastic bag characterized in that a port body is welded in a state in which the expanded diameter portion is sandwiched between two plastic sheet sheets that form a port insertion hole with the longer diameter of the expanded diameter portion aligned with the parting line of the heating mold Exist in the manufacturing method.

本発明に係るプラスチックバッグの製造方法によれば、特定の形状の拡径部がポート本体に形成されたポート、加熱金型のポート部加熱面が特定の断面形状に形成されたポート溶着用ヒートシール金型装置を使用することにより、バッグ本体のヒートシール部にポートを溶着する際、ヒートシール部のポート溶着部に形成される各プラスチックシート同士の平面状に溶着される部位と各プラスチックシートのポート本体半周面に溶着される部位との切返し部分を鈍角状に屈曲させ、切返し部分における薄肉化を防止できるため、ピンホールの発生を防止することが出来る。   According to the method for manufacturing a plastic bag of the present invention, a port in which a diameter-enlarged portion having a specific shape is formed in a port body, and a port welding heat in which a port portion heating surface of a heating mold is formed in a specific cross-sectional shape When a port is welded to the heat seal part of the bag body by using a sealing mold device, the parts to be welded to each other in a planar shape and each plastic sheet formed on the port weld part of the heat seal part Since the cut-back portion with the part welded to the half peripheral surface of the port body can be bent at an obtuse angle and the thinning at the cut-back portion can be prevented, the occurrence of pinholes can be prevented.

本発明に係るプラスチックバッグの製造方法の一実施形態を図面に基づいて説明する。図１は、本発明の製造方法により得られるプラスチックバッグの一形態の全体を示す平面図である。図２〜図７及び図９〜図１１は、本発明の製造方法に適用される装置および部材の一例を示す図であり、そのうち、図９は、ポートの溶着に使用されるポート溶着用ヒートシール金型装置を示す正面図およびヒートシール金型装置の加熱金型の構造を示す縦断面図、図１０は、図９のヒートシール金型装置のパーティング面である加熱金型の加熱面を示す平面図、図１１は、加熱金型における半円筒状のポート部加熱面の構造を示す縦断面図である。また、図８は、本発明の製造方法により得られるプラスチックバッグのポート溶着部を示す平面図およびポート溶着部をI−I線に沿って破断した断面図である。   An embodiment of a method for producing a plastic bag according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the entirety of one embodiment of a plastic bag obtained by the production method of the present invention. FIGS. 2 to 7 and FIGS. 9 to 11 are views showing examples of apparatuses and members applied to the manufacturing method of the present invention. Among them, FIG. 9 shows a port welding heat used for welding the ports. FIG. 10 is a front view showing the sealing mold apparatus and a longitudinal sectional view showing the structure of the heating mold of the heat sealing mold apparatus. FIG. 10 is a heating surface of the heating mold which is a parting surface of the heat sealing mold apparatus of FIG. FIG. 11 is a longitudinal sectional view showing the structure of the semi-cylindrical port portion heating surface in the heating mold. FIG. 8 is a plan view showing the port welded portion of the plastic bag obtained by the manufacturing method of the present invention and a cross-sectional view of the port welded portion taken along the line II.

先ず、本発明に係るプラスチックバッグの製造方法により得られるプラスチックバックについて説明する。本発明のプラスチックバックは、図１に符号（１Ａ）で示されており、医療用の輸液バッグ、液体医薬品の包装用バッグ、飲料包装用バッグ等、液状物を収容するバッグとして使用される。斯かるプラスチックバック（１Ａ）は、プラスチックシート積層体（１０）（図３及び図８（ｂ）参照）にヒートシールを施して成るバック本体（１）と、当該バック本体のヒートシール部、通常はトップシール部（１２）に溶着された口栓用のポート（２）とを備えている。   First, the plastic bag obtained by the plastic bag manufacturing method according to the present invention will be described. The plastic bag of the present invention is denoted by reference numeral (1A) in FIG. 1 and is used as a bag for storing a liquid material, such as a medical infusion bag, a liquid medicine packaging bag, and a beverage packaging bag. Such a plastic bag (1A) includes a back body (1) obtained by heat-sealing a plastic sheet laminate (10) (see FIGS. 3 and 8B), a heat seal portion of the back body, Comprises a plug port (2) welded to the top seal portion (12).

バック本体（１）の構成材料、すなわち、プラスチックシート積層体（１０）の材料としては、オレフィン系樹脂が使用される。層構成は、単層であってもよいし、複層であってもよい。上記のオレフィン系樹脂としては、ポリエチレンとポリプロピレン系ポリマーが代表的である。ポリエチレンとしては、低密度ポリエチレン、線状低密度ポリエチレン、低密度ポリエチレンと線状低密度ポリエチレンの混合物、低密度ポリエチレンとメタタロセン触媒を使用して得られる低密度ポリエチレンとの混合物、低密度ポリエチレンと高密度ポリエチレンの混合物、高密度ポリエチレン、高密度ポリエチレンとメタタロセン触媒を使用して得られる低密度ポリエチレンとの混合物、低密度ポリエチレンとポリオレフィン系エラストマーの混合物などが挙げられる。また、ポリプロピレン系ポリマーとしては、ポリプロピレンの他、ポリプロピレンとメタタロセン触媒を使用して得られるポリプロピレンの混合物、オレフィン系特殊共重合軟質樹脂を含むポリプロピレンターポリマー、ポリプロピレンとポリオレフィン系エラストマーの混合物などが挙げられる。   As a constituent material of the back body (1), that is, a material of the plastic sheet laminate (10), an olefin resin is used. The layer configuration may be a single layer or multiple layers. Typical examples of the olefin resin include polyethylene and polypropylene polymers. Examples of polyethylene include low density polyethylene, linear low density polyethylene, a mixture of low density polyethylene and linear low density polyethylene, a mixture of low density polyethylene and low density polyethylene obtained using a metaltarocene catalyst, low density polyethylene and high density polyethylene. Examples thereof include a mixture of density polyethylene, high-density polyethylene, a mixture of high-density polyethylene and a low-density polyethylene obtained by using a metaltarocene catalyst, and a mixture of low-density polyethylene and a polyolefin-based elastomer. Examples of the polypropylene-based polymer include polypropylene, a polypropylene mixture obtained using a polypropylene and a metatarocene catalyst, a polypropylene terpolymer containing an olefin-based special copolymer soft resin, and a polypropylene-polyolefin elastomer mixture. .

本発明において、バック本体（１）（プラスチックシート積層体（１０））を構成するプラスチックシート（以下、「シート」と言う。）（１ｓ）にはフィルムが含まれ、その１枚の厚さは、強度、加工性、コストなどの観点から、通常は１５０〜４００μｍ、好ましくは２００〜３００μｍとされる。バック本体（１）は、後述する様にプラスチックシート積層体（１０）に２方シール又は４方シールを施すことにより、平面形状（内容物充填前の扁平形状）を通常は略方形に形成される。バック本体（１）の平面寸法（充填前の平面寸法）は、用途によっても異なるが、一般的には充填容量が５００ｍｌの場合で１４〜１６ｃｍ×２４〜２６ｃｍ程度である。   In the present invention, the plastic sheet (hereinafter referred to as “sheet”) (1s) constituting the back body (1) (plastic sheet laminate (10)) includes a film, and the thickness of one sheet is From the viewpoints of strength, workability, cost, etc., it is usually 150 to 400 μm, preferably 200 to 300 μm. As will be described later, the back body (1) is formed in a generally rectangular shape in a planar shape (flat shape before filling the contents) by applying a two-side seal or a four-side seal to the plastic sheet laminate (10). The The planar dimension (planar dimension before filling) of the back body (1) varies depending on the application, but is generally about 14 to 16 cm × 24 to 26 cm when the filling capacity is 500 ml.

ポート（２）は、後述する様に射出成形および加熱整形によって作製され、その構成材料としては、射出成形可能で且つバック本体（１）に溶着可能な上記と同様の樹脂が使用される。ポート（２）は、バック本体（１）に液状物を充填し且つバック本体（１）から液状物を排出するためのパイプ状の口部材であり、図１及び図４（ａ）に示す様に、円形パイプ状形成され且つバック本体（１）の例えばトップシール部（１２）に溶着されるポート本体（２１）と、当該ポート本体の一端に設けられ且つ打栓溶着方式（図に例示した方式）や螺子蓋方式などの栓部材を取付可能に構成された口栓装着部（２２）とから成る。ポート（２）のポート本体（２１）の大きさは、長さが２５〜５０ｍｍ程度、外径が８〜２０ｍｍ程度、肉厚が１．０〜２．５ｍｍ程度である。   The port (2) is manufactured by injection molding and heat shaping as will be described later, and as the constituent material, a resin similar to the above that can be injection-molded and welded to the back body (1) is used. The port (2) is a pipe-shaped mouth member for filling the back body (1) with a liquid material and discharging the liquid material from the back body (1), as shown in FIG. 1 and FIG. 4 (a). And a port body (21) formed in a circular pipe shape and welded to, for example, the top seal portion (12) of the back body (1), and a plug welding system (illustrated in the figure) provided at one end of the port body. And a plug mounting portion (22) configured to be attachable to a plug member such as a screw lid type. The size of the port body (21) of the port (2) is about 25 to 50 mm in length, about 8 to 20 mm in outer diameter, and about 1.0 to 2.5 mm in thickness.

本発明において、ポート（２）は、トップシール部（１２）のポート挿入穴（１２ｃ）に対するポート本体（２１）の溶着強度を高めるため、図４（ａ）に示す様に、円形パイプ状のポート本体（２１）の先端部に厚肉の円筒状断面の拡径部（２３）を有している。しかも、後述する様に、ポート溶着部（１２ｂ）（図８（ａ）参照）に形成される切返し部分（Ｐ）、すなわち、ポート溶着部（１２ｂ）の各シート（１ｓ）同士の平面状に溶着された部位と各シート（１ｓ）のポート本体半周面に溶着された部位との切返し部分（Ｐ）（図８（ｂ）参照）を鈍角状に屈曲させるため、拡径部（２３）の外形は、図７（ｂ）に示す様に、ポート本体（２１）の中心線に直交して断面視した場合、２つの同一の劣弧から成る略楕円形状に整形されている。   In the present invention, the port (2) has a circular pipe shape as shown in FIG. 4 (a) in order to increase the welding strength of the port body (21) to the port insertion hole (12c) of the top seal portion (12). The port main body (21) has a thick-walled cylindrical cross section (23) at the tip. In addition, as will be described later, the cut-back portion (P) formed in the port welded portion (12b) (see FIG. 8A), that is, in a planar shape between the sheets (1s) of the port welded portion (12b). In order to bend the cut-back portion (P) (see FIG. 8 (b)) between the welded portion and the portion welded to the half circumference surface of the port body of each sheet (1s), As shown in FIG. 7B, the outer shape is shaped into a substantially elliptical shape formed of two identical subarcs when viewed in cross-section perpendicular to the center line of the port body (21).

具体的には、略楕円形断面の拡径部（２３）は、後述する様に、図６及び図７に示すポート整形金型装置（７）の整形金型（７ａ）における略半円筒状の整形面（７５）によって形成されるが、整形後の拡径部（２３）は、図７（ｂ）に示す様に、整形面（７５）と同様の２つの劣弧から成る断面形状を有している。整形後の拡径部（２３）の各劣弧は、ポート本体（２１）の中心線に直交して断面視した場合、整形前の拡径部（２３）の直径（図７（ａ）参照））とポート本体（２１）の基端側の直径との差の範囲内に相当する距離（ｄ）だけ整形金型（７ａ）のパーティング面（Ｌ１）（ポート本体（２１）の中心線を含む分割面）に対して他方の整形面（７５）側へ中心（Ｏ１）がずれ且つポート本体（２１）の整形前の拡径部（２３）の最大半径（ｂ）よりもずれの距離（ｄ）だけ半径（ｒ１）が大きな劣弧に形成されている。 Specifically, the diameter-enlarged portion (23) having a substantially elliptical cross section has a substantially semi-cylindrical shape in the shaping mold (7a) of the port shaping mold apparatus (7) shown in FIGS. As shown in FIG. 7 (b), the enlarged diameter portion (23) has a cross-sectional shape composed of two subarcs similar to the shaped surface (75). Have. Each inferior arc of the enlarged diameter portion (23) after shaping is a diameter of the enlarged diameter portion (23) before shaping (see FIG. 7A) when viewed in cross-section perpendicular to the center line of the port body (21). )) And the parting surface (L 1 ) of the shaping mold (7a) (the center of the port body (21) by a distance (d) corresponding to the range of the difference between the diameter of the port body (21) and the base end side. The center (O 1 ) is shifted to the other shaping surface (75) side with respect to the dividing surface including the line) and is displaced from the maximum radius (b) of the enlarged diameter portion (23) before shaping of the port body (21). The radius (r 1 ) is formed to be a large subarc by the distance (d).

すなわち、拡径部（２３）は、仮想二等分線（整形金型（７ａ）のパーティング面（Ｌ１））の両側から均等にやや押し潰した状態の略楕円形状に形成されている。ポート（２）のポート本体（２１）を上記の様に形成することにより、ポート（２）を溶着した際、各シート（１ｓ）同士の平面状に溶着される部位と各シート（１ｓ）のポート本体（２１）半周面に溶着される部位との切返し部分（Ｐ）におけるシート（１ｓ）の厚さを十分に確保することが出来る。 That is, the diameter-expanded portion (23) is formed in a substantially elliptical shape in a state where the virtual bisector (parting surface (L 1 ) of the shaping mold (7a)) is slightly crushed evenly from both sides. . By forming the port main body (21) of the port (2) as described above, when the port (2) is welded, the portion to be welded in a planar shape between the sheets (1s) and the sheet (1s) A sufficient thickness of the sheet (1s) can be ensured at the cut-back portion (P) between the port main body (21) and the portion welded to the half circumferential surface.

更に、本発明の好ましい態様においては、図８（ｂ）に示す様に、ポート溶着部（１２ｂ）における上記の切返し部分（Ｐ）の２枚のシート（１ｓ）の突合せ部分と拡径部（２３）の外周面との界面を完全に一体化して溶着強度を高めるため、ポート（２）として、拡径部（２３）が特定形状になされたポートを使用することも出来る。すなわち、好ましい態様のポート（２）は、図４（ｂ）及び（ｃ）、図７（ｂ）並びに図８（ｂ）に示す様に、ポート本体（２１）の拡径部（２３）の外周面に対して当該拡径部の長径方向（断面形状における長径方向）に一対の薄肉の張出し片（２３ｐ）を張り出して構成される。   Further, in a preferred embodiment of the present invention, as shown in FIG. 8 (b), the butted portion and the enlarged diameter portion of the two sheets (1s) of the turned-up portion (P) in the port weld portion (12b) ( 23) Since the interface with the outer peripheral surface of 23) is completely integrated and the welding strength is increased, a port in which the enlarged-diameter portion (23) has a specific shape can be used as the port (2). That is, the port (2) of the preferred embodiment has a diameter-enlarged portion (23) of the port body (21) as shown in FIGS. 4 (b) and (c), FIG. 7 (b) and FIG. 8 (b). A pair of thin projecting pieces (23p) are projected from the outer peripheral surface in the major axis direction (major axis direction in the cross-sectional shape) of the enlarged diameter portion.

具体的には、図４（ｂ）に示すポート（２）は、ポート本体（２１）先端部の拡径部（２３）の外周面に対し、当該ポート本体の中心線（中心（Ｏ）の線）に沿って細長に形成された羽根状の張出し片（２３ｐ）を前記の中心線周りに対称な位置に一対配置した構造を備えている。また、図４（ｃ）に示すポート（２）は、ポート本体（２１）先端部の拡径部（２３）にリング状の凹凸部を形成し、かつ、図４（ｂ）と同様の羽根状の張出し片（２３ｐ）を一対配置した構造を備えている。   Specifically, the port (2) shown in FIG. 4B has a center line (center (O) of the port main body (21) with respect to the outer peripheral surface of the enlarged diameter portion (23) at the tip of the port main body (21). A pair of blade-like projecting pieces (23p) formed in a slender shape along the line) at symmetrical positions around the center line. Further, the port (2) shown in FIG. 4 (c) has a ring-shaped concavo-convex portion formed in the enlarged diameter portion (23) at the distal end portion of the port main body (21), and the blades similar to FIG. It has a structure in which a pair of protruding pieces (23p) are arranged.

更に、本発明においては、図８（ｂ）及び図１１（ｂ）に示す様に、上記の切返し部分（Ｐ）におけるポート本体（２１）とシート（１ｓ）との溶着強度を一層高めるため、ポート（２）の拡径部（２３）における各張出し片（２３ｐ）の張出し方向に沿った厚さ部分の断面形状は、尖鋭な略三角形状に形成されているのが好ましい。しかも、ポート（２）における各張出し片（２３ｐ）のポート本体（２１）外周面からの張出し長さは、シート（１ｓ）の厚さの２〜１０倍に設定される。そして、ポート（２）における各張出し片（２３ｐ）のポート本体（２１）の中心線に沿った長さは、バック本体（１）のトップシール部（１２）のポート挿入穴（１２ｃ）の長さの０．６〜０．９５倍に設定される。   Furthermore, in the present invention, as shown in FIGS. 8 (b) and 11 (b), in order to further increase the welding strength between the port body (21) and the sheet (1s) in the cut-back portion (P), The cross-sectional shape of the thickness portion along the protruding direction of each protruding piece (23p) in the enlarged diameter portion (23) of the port (2) is preferably formed in a sharp, substantially triangular shape. Moreover, the overhang length of each overhang piece (23p) in the port (2) from the outer peripheral surface of the port body (21) is set to 2 to 10 times the thickness of the sheet (1s). The length of each overhang piece (23p) in the port (2) along the center line of the port body (21) is the length of the port insertion hole (12c) of the top seal portion (12) of the back body (1). It is set to 0.6 to 0.95 times that.

上記の様なポート（２）は、図８（ｂ）及び図１１（ｂ）に示す様に、バック本体（１）のヒートシール部である例えばトップシール部（１２）に形成されたポート挿入穴（１２ｃ）に挿入され、後述するポート溶着用ヒートシール金型装置（８）（図９参照）により、ポート本体（２１）の拡径部（２３）の長径を加熱金型（８１）のパーティング面（Ｌ２）（ヒートシール部（１２ｂ）のプラスチックシート積層体（１０）の溶着面）に揃えられ且つプラスチックシート積層体（１０）の２枚のシート（１ｓ）によって拡径部（２３）を挟み込まれた状態で溶着される。特に、図４（ｂ）及び（ｃ）に示すポート（２）は、プラスチックシート積層体（１０）の２枚のシート（１ｓ）によって拡径部（２３）と共に各張出し片（２３ｐ）を挟み込んだ状態でポート本体（２１）を溶着される。 As shown in FIGS. 8B and 11B, the port (2) as described above is inserted into, for example, a top seal portion (12) which is a heat seal portion of the back body (1). The long diameter of the enlarged diameter portion (23) of the port body (21) is inserted into the hole (12c) and the heat sealing mold device (8) (see FIG. 9) described later for the port welding heat sealing mold device (see FIG. 9). The enlarged part (Ls) is aligned with the parting surface (L 2 ) (welding surface of the plastic sheet laminate (10) of the heat seal portion (12b)) and is expanded by the two sheets (1s) of the plastic sheet laminate (10). 23) is welded in a state of being sandwiched. In particular, the port (2) shown in FIGS. 4 (b) and 4 (c) sandwiches each protruding piece (23p) together with the enlarged diameter portion (23) by two sheets (1s) of the plastic sheet laminate (10). In this state, the port body (21) is welded.

プラスチックバック（１Ａ）においては、上記の様に、断面が略楕円形状の拡径部（２３）がポート本体（２１）に設けられたポート（２）を使用することにより、トップシール部（１２）にポート（２）を溶着した際、ポート溶着部（１２ｂ）における各シート（１ｓ）同士の平面状に溶着された部位と各シート（１ｓ）のポート本体半周面に溶着された部位との切返し部分（Ｐ）（図８（ｂ）参照）を鈍角状に屈曲させ、切返し部分（Ｐ）の薄肉化を防止できるため、ピンホールの発生を防止できる。特に、拡径部（２３）に一対の張出し片（２３ｐ）が設けられたポート（２）を使用することにより、切返し部分（Ｐ）で２枚のシート（１ｓ）の突合せ部分に張出し片（２３ｐ）を介在させ、切返し部分（Ｐ）の各シート（１ｓ）の屈曲面を鈍角の曲面に形成して張出し片（２３ｐ）と一体化させることが出来るため、各シート（１ｓ）の屈曲部分の薄肉化をより低減でき、ポート本体（２１）の外周面とシート（１ｓ）との界面における溶着強度を一層高めることが出来できる。   In the plastic bag (1A), as described above, by using the port (2) in which the enlarged diameter portion (23) having a substantially elliptical cross section is provided in the port body (21), the top seal portion (12 ), When the port (2) is welded, the portion of the port welded portion (12b) that is welded in a plane between the sheets (1s) and the portion that is welded to the half circumference of the port body of each sheet (1s) Since the cut-back portion (P) (see FIG. 8B) can be bent at an obtuse angle to prevent the cut-back portion (P) from being thinned, the occurrence of pinholes can be prevented. In particular, by using a port (2) in which a pair of overhanging pieces (23p) is provided in the enlarged diameter portion (23), the overhanging piece (P) has an overhanging piece (P 23p), the bent surface of each sheet (1s) of the cut-back portion (P) can be formed into an obtuse curved surface and integrated with the overhanging piece (23p). Therefore, the welding strength at the interface between the outer peripheral surface of the port body (21) and the sheet (1s) can be further increased.

次に、本発明に係る上記のプラスチックバック（１Ａ）の製造方法について説明する。プラスチックバック（１Ａ）の製造においては、前述のプラスチックシート積層体（１０）にヒートシールを施すことにより（図２及び図３参照）、例えばトップシール部（１２）にポート挿入穴（１２ｃ）が形成されたバック本体（１）を製造し（図１及び図８（ａ）参照）、かつ、円形パイプ状のポート本体（２１）の一部に略楕円形状断面に整形された厚肉の拡径部（２３）を有する前述のポート（２）を製造した後（図５及び図６参照）、バック本体（１）のトップシール部（１２）のポート挿入穴（１２ｃ）にポート本体（２１）を挿入し、プラスチックシート積層体（１０）の２枚のシート（１ｓ）によってポート本体（２１）の拡径部（２３）を挟み込んだ状態において、特定のポート溶着用ヒートシール金型装置（８）を使用してポート本体（２１）を溶着する（図９及び図１０参照）。以下、（I）バック本体（１）の製造工程、（II）ポート（２）の製造工程、および、（III）ポート（２）の溶着工程を順次に説明する。   Next, the manufacturing method of said plastic bag (1A) based on this invention is demonstrated. In the manufacture of the plastic bag (1A), the above-mentioned plastic sheet laminate (10) is heat-sealed (see FIGS. 2 and 3), for example, a port insertion hole (12c) is formed in the top seal portion (12). The formed back body (1) is manufactured (see FIG. 1 and FIG. 8 (a)), and a thick-walled expansion shaped into a substantially elliptical cross section is formed on a part of the circular pipe-shaped port body (21). After manufacturing the aforementioned port (2) having the diameter portion (23) (see FIGS. 5 and 6), the port body (21) is inserted into the port insertion hole (12c) of the top seal portion (12) of the back body (1). ), And in a state where the enlarged diameter portion (23) of the port body (21) is sandwiched between the two sheets (1s) of the plastic sheet laminate (10), 8) Use Welding the port body (21) with (see FIGS. 9 and 10). Hereinafter, (I) the manufacturing process of the back body (1), (II) the manufacturing process of the port (2), and (III) the welding process of the port (2) will be sequentially described.

（I）バック本体の製造工程：
バック本体（１）は、例えば図２に示す様なヒートシール装置（３）を使用し、プラスチックシート積層体（１０）にヒートシールを施して製造される。プラスチックシート積層体（１０）としては、インフレーションチューブ、または、独立した２枚のシート（１ｓ）を重ね合わせた積層体が使用される。インフレーションチューブを使用する場合には、２方シールを施すことによりバック本体（１）を製造でき、また、２枚のシート（１ｓ）から成る積層体を使用する場合には、４方シールを施すことによりバック本体（１）を製造できる。 (I) Back body manufacturing process:
The back body (1) is manufactured by heat-sealing the plastic sheet laminate (10) using, for example, a heat seal device (3) as shown in FIG. As the plastic sheet laminate (10), an inflation tube or a laminate obtained by superimposing two independent sheets (1s) is used. When using an inflation tube, the back body (1) can be manufactured by applying a two-way seal, and when using a laminate composed of two sheets (1s), a four-way seal is applied. Thus, the back body (1) can be manufactured.

ヒートシール装置（３）としては、通常、ロータリー方式のヒートシール装置又は図２に示す様なライン方式のヒートシール装置が使用される。図示しないが、ロータリー方式のヒートシール装置は、概略、ローターの外周面に一定間隔で多数配置された基台としてのシール用受金の表面にプラスチックバック（１Ａ）の１つ分に相当する材料のプラスチックシート積層体（１０）を逐次供給すると共に、一方向にローターを回転させる間、ローターの外周側に配置されたヒートシール金型（４）及びヒートシール部冷却金型（５）（図３参照）を順次に押し付けることにより、ヒートシールを施す様になされている。   As the heat seal device (3), a rotary heat seal device or a line heat seal device as shown in FIG. 2 is usually used. Although not shown, the rotary heat seal device is roughly a material equivalent to one plastic bag (1A) on the surface of a seal receiving plate as a base arranged on the outer peripheral surface of the rotor at regular intervals. While sequentially supplying the plastic sheet laminate (10) and rotating the rotor in one direction, the heat seal mold (4) and the heat seal portion cooling mold (5) arranged on the outer peripheral side of the rotor (FIG. 3) is sequentially pressed to perform heat sealing.

ライン方式のヒートシール装置（３）は、図２（ａ）に示す様に、原反ロールから連続的に供給される帯状のプラスチックシート積層体（１０）に連続的にヒートシールを施す装置であり、通常、複数台が直線的に配置される。図２（ａ）に例示した装置は縦型構造の装置であり、各ヒートシール装置（１Ａ）は、上面にシール用受金（３２）が配置された装置架台（３１）と、当該シール用受金の上方に昇降可能に配置されたヒートシール金型（４）と、シール用受金（３２）の側方に配置され且つヒートシール金型（４）とシール用受金（３２）の間に進退可能に構成されたヒートシール部冷却金型（５）とを備え、シール用受金（３２）の表面に供給されたプラスチックシート積層体（１０）に対し、ヒートシール金型（４）でヒートシールを行い、次いで、ヒートシール部冷却金型（５）でヒートシール部を冷却する様になされている。   As shown in FIG. 2 (a), the line-type heat seal device (3) is a device that continuously heat-seals the strip-shaped plastic sheet laminate (10) continuously supplied from the raw roll. In general, a plurality of units are arranged linearly. The apparatus illustrated in FIG. 2 (a) is an apparatus having a vertical structure, and each heat seal apparatus (1A) includes an apparatus mount (31) having a seal receiver (32) disposed on the upper surface, and the seal A heat seal mold (4) disposed so as to be movable up and down above the metal receiver, and a heat seal mold (4) and a seal metal receiver (32) disposed on the side of the seal metal receiver (32). A heat seal portion cooling mold (5) configured to be movable back and forth between the heat seal mold (4) with respect to the plastic sheet laminate (10) supplied to the surface of the seal receiving metal (32). ) And then the heat seal portion is cooled by the heat seal portion cooling mold (5).

具体的には、図２（ｂ）に示す様に、ヒートシール金型（４）は、加熱手段としてのヒーター又は熱媒体流路が内部に配置された金型基台（３５）に設けられ、金型基台（３５）は、鉛直に配置されたシリンダー装置などの駆動機構（３３）の先端にヒートシール金型（４）を下方に向けて取り付けられる。従って、ヒートシール金型（４）は、駆動機構（３３）を作動させて下降させることにより、シール用受金（３２）の表面のプラスチックシート積層体（１０）に押し当てることが出来る。なお、ヒートシール金型（４）の温度は、金型基台（３５）内部の加熱手段の制御により、通常、プラスチックシート積層体（１０）の融点よりも３０〜７０℃高い温度、例えば低密度ポリエチレンの場合で１５５〜１９５℃程度に制御される。   Specifically, as shown in FIG. 2 (b), the heat seal mold (4) is provided on a mold base (35) in which a heater or a heat medium flow path as a heating means is disposed. The mold base (35) is attached to the tip of a drive mechanism (33) such as a cylinder device arranged vertically with the heat seal mold (4) facing downward. Therefore, the heat seal mold (4) can be pressed against the plastic sheet laminate (10) on the surface of the seal receiving metal (32) by operating and lowering the drive mechanism (33). The temperature of the heat-sealing mold (4) is usually 30 to 70 ° C. higher than the melting point of the plastic sheet laminate (10), for example, low by controlling the heating means inside the mold base (35). In the case of density polyethylene, the temperature is controlled to about 155 to 195 ° C.

一方、ヒートシール部冷却金型（５）は、一定温度を保つため、加熱装置および冷却装置を備えた温度調節手段としての冷却水循環器に管路で接続されることにより、内部に冷却水を循環可能に構成される。そして、図２（ｂ）に示す様に、水平に配置されたシリンダー装置などの駆動機構（３４）の先端の金型基台（３６）にヒートシール部冷却金型（５）を下方に向けて取り付けられる。更に、金型基台（３６）は、弾性部材が挿入された支持部材（３７）を介して駆動機構（３４）の先端に取り付けられ、前記の弾性部材によって上方に付勢されることにより、常時、ヒートシール金型（４）とシール用受金（３２）の間の一定の高さに保持される。しかも、金型基台（３６）の上面側外周部には、上記のヒートシール金型（４）の金型基台（３５）のベース部に係合するヘッドピン（３８）が突設されている。   On the other hand, in order to maintain a constant temperature, the heat seal part cooling mold (5) is connected to a cooling water circulator as a temperature adjusting means provided with a heating device and a cooling device by a pipe line, thereby supplying cooling water therein. It is configured to be recyclable. Then, as shown in FIG. 2 (b), the heat seal portion cooling mold (5) is directed downward to the mold base (36) at the tip of the drive mechanism (34) such as a horizontally arranged cylinder device. Attached. Furthermore, the mold base (36) is attached to the tip of the drive mechanism (34) via a support member (37) into which an elastic member is inserted, and is urged upward by the elastic member. It is always maintained at a constant height between the heat seal mold (4) and the seal receiving metal (32). In addition, a head pin (38) that engages with the base portion of the mold base (35) of the heat seal mold (4) is provided on the outer periphery of the upper surface side of the mold base (36). Yes.

従って、図２（ｃ）に示す様に、ヒートシール部冷却金型（５）は、ヒートシール金型（４）が上昇している際に駆動機構（３４）を作動させて前進させることにより、シール用受金（３２）の上方に位置させることが出来、そして、駆動機構（３３）を作動させてヒートシール金型（４）と共にヘッドピン（３８）を介して下降させることにより、シール用受金（３２）の表面のプラスチックシート積層体（１０）に押し当てることが出来る。なお、ヒートシール部冷却金型（５）の温度は、通常、プラスチックシート積層体（１０）の融点よりも８０〜１２０℃程度低い温度、例えば２０〜６０℃程度に制御される。   Accordingly, as shown in FIG. 2 (c), the heat seal portion cooling mold (5) is moved forward by operating the drive mechanism (34) when the heat seal mold (4) is raised. , Can be positioned above the seal receiving plate (32), and the drive mechanism (33) is actuated to lower it together with the heat seal mold (4) via the head pin (38). It can be pressed against the plastic sheet laminate (10) on the surface of the receiver (32). In addition, the temperature of the heat seal part cooling mold (5) is usually controlled to a temperature lower by about 80 to 120 ° C., for example, about 20 to 60 ° C. than the melting point of the plastic sheet laminate (10).

上記の様なロータリー方式あるいはライン方式のヒートシール装置（３）に組み込まれるヒートシール金型（４）としては、２方シールを施すための図３（ａ）に示す様な平面形状のもの、または、４方シールを施すための図３（ｂ）に示す様な平面形状のものが挙げられる。   The heat seal mold (4) incorporated in the rotary or line heat seal device (3) as described above has a planar shape as shown in FIG. Or the thing of a planar shape as shown in FIG.3 (b) for giving a four-way seal | sticker is mentioned.

図３（ａ）に示す２方シール用のヒートシール金型（４）は、金型基台（３５）の表面にそれぞれ突設されたトップシール構成部（４ａ）及びボトムシール構成部（４ｂ）とから成る。トップシール構成部（４ａ）は、ポート（２）装着用のポート挿入穴（１２ｃ）を形成するため、ポート挿入穴（１２ｃ）に相当する部位を欠落させた形状の２分割構造を有し、各分割部分の平面形状を略Ｌ字状に形成される。また、ボトムシール構成部（４ｂ）は、平面形状を略扁平な凹状に形成される。   The heat seal mold (4) for two-way sealing shown in FIG. 3 (a) has a top seal component (4a) and a bottom seal component (4b) respectively protruding from the surface of the mold base (35). ). The top seal component (4a) has a two-divided structure in which a portion corresponding to the port insertion hole (12c) is omitted in order to form a port insertion hole (12c) for mounting the port (2). The planar shape of each divided part is formed in a substantially L shape. Further, the bottom seal component (4b) is formed to have a substantially flat concave shape in plan view.

一方、図３（ｂ）に示す４方シール用のヒートシール金型（４）は、金型基台（３５）の表面に突設され且つ相互に連続するトップシール構成部（４ａ）、ボトムシール構成部（４ｂ）及びサイドシール構成部（４ｃ）とから成る。すなわち、図３（ｂ）に示すヒートシール金型（４）は、上記の図３（ａ）に示す金型と同様の分割構造のトップシール構成部（４ａ）とボトムシール構成部（４ｂ）とを２つのサイドシール構成部（４ｃ）で繋いだ構造を備えている。   On the other hand, the heat seal mold (4) for four-way sealing shown in FIG. 3 (b) has a top seal component (4a) and a bottom that protrude from the surface of the mold base (35) and are continuous with each other. It consists of a seal component (4b) and a side seal component (4c). That is, the heat seal mold (4) shown in FIG. 3 (b) includes a top seal component (4a) and a bottom seal component (4b) having the same divided structure as the mold shown in FIG. 3 (a). Are connected by two side seal components (4c).

なお、図３（ａ）及び（ｂ）に示すヒートシール金型（４）においては、バック本体（１）の肩口、ポート挿入穴（１２ｃ）の立上り部分および底辺の両角部の破袋強度を高めるため、前記の肩口、立上り部分、底辺の両角部にそれぞれ相当するトップシール構成部（４ａ）及びボトムシール構成部（４ｂ）の各入隅部および出隅部が円弧状に形成される。また、トップシール構成部（４ａ）及びボトムシール構成部（４ｂ）には、溶着熱量を軽減するための開口が設けられ、ボトムシール構成部（４ｂ）の中央には、吊下げ用の穴を形成するために円形の開口が設けられる。   In the heat seal mold (4) shown in FIGS. 3 (a) and 3 (b), the bag breaking strength at the shoulder opening of the back body (1), the rising portion of the port insertion hole (12c) and both corners of the bottom side is shown. In order to increase the height, the entrance corner and the exit corner of the top seal component (4a) and the bottom seal component (4b) respectively corresponding to the shoulder, the rising part, and the bottom corners are formed in an arc shape. The top seal component (4a) and the bottom seal component (4b) are provided with openings for reducing the amount of heat of welding, and a hole for suspension is provided at the center of the bottom seal component (4b). A circular opening is provided to form.

また、上記の様なヒートシール金型（４）においては、プラスチックシート積層体（１０）にヒートシールを施す際、バック本体（１）の各ヒートシール部（トップシール部（１２）、ボトムシール部（１３）、サイドシール部（１４））の内縁（１５）（図１参照）に相当する部位におけるバンクの発生を抑制し、バンク基部の薄肉化を防止するため、バッグ内側寄りの角部が曲面に形成された加熱面（４ｓ）を有し、かつ、加熱面（４ｓ）は、バッグ内側寄りの角部に沿う縁部（４０）をシール用受金（３２）に対して後退させた２段構造に構成される。縁部（４０）の幅はシート（１ｓ）の厚さの１５０〜１３００％に設定され、縁部（４０）の後退深さ（段差の深さ）はシート（１ｓ）の厚さの５〜２５％に設定される。   Further, in the heat seal mold (4) as described above, when the plastic sheet laminate (10) is heat sealed, each heat seal portion (top seal portion (12), bottom seal) of the back body (1). In order to suppress the occurrence of banks in the portion corresponding to the inner edge (15) (see FIG. 1) of the portion (13) and the side seal portion (14), and to prevent the bank base from being thinned, the corner portion closer to the inner side of the bag Has a heating surface (4s) formed in a curved surface, and the heating surface (4s) causes the edge portion (40) along the corner portion closer to the inner side of the bag to retreat with respect to the seal receiver (32). It has a two-stage structure. The width of the edge (40) is set to 150 to 1300% of the thickness of the sheet (1s), and the retreat depth (depth of the step) of the edge (40) is 5 to 5% of the thickness of the sheet (1s). Set to 25%.

ヒートシール金型（４）においては、加熱面（４ｓ）を上記の様な２段構造に構成することにより、プラスチックシート積層体（１０）に当該ヒートシール金型を押し付けた際、加圧力を損なうことなく、シート表面の溶融樹脂の逃げ代を確保でき、大きなバンクの発生やバンク基部の薄肉化を防止できる。   In the heat seal mold (4), the heating surface (4s) is configured in a two-stage structure as described above, so that when the heat seal mold is pressed against the plastic sheet laminate (10), the applied pressure is reduced. Without damaging, it is possible to secure a clearance for the molten resin on the surface of the sheet, and to prevent generation of a large bank and thinning of the bank base.

また、上記の様な各方式のヒートシール装置において使用されるヒートシール部冷却金型（５）は、温度設定の違い、平面寸法の僅かな違い等を除き、前述のヒートシール金型（４）と同等の平面形状を有する。すなわち、ヒートシール部冷却金型（５）としては、２方シールを施す場合には図３（ａ）に示す様な平面形状のもの、４方シールを施す場合には図３（ｂ）に示す様な平面形状のものが使用される。図３中の括弧内の符号が冷却金型およびその構成要素を示す。   Further, the heat seal portion cooling mold (5) used in the heat sealing apparatus of each type as described above is the above-described heat seal mold (4) except for a difference in temperature setting, a slight difference in planar dimensions, and the like. ). That is, as the heat seal part cooling mold (5), when a two-way seal is applied, a flat shape as shown in FIG. 3 (a) is used. A plane shape as shown is used. The code | symbol in the parenthesis in FIG. 3 shows a cooling die and its component.

図３（ａ）に示す２方シール用のヒートシール部冷却金型（５）は、金型基台（３６）の表面にそれぞれ突設されたトップシール冷却部（５ａ）及びボトムシール冷却部（５ｂ）とから成り、図３（ｂ）に示す４方シール用のヒートシール部冷却金型（５）は、金型基台（３６）の表面に突設され且つ相互に連続するトップシール冷却部（５ａ）、ボトムシール冷却部（５ｂ）及びサイドシール冷却部（５ｃ）とから成る。上記の各部位の形状的特徴はヒートシール金型（４）におけるのと同様である。   The heat seal portion cooling mold (5) for two-way sealing shown in FIG. 3 (a) has a top seal cooling portion (5a) and a bottom seal cooling portion respectively protruding from the surface of the mold base (36). The heat seal portion cooling mold (5) for a four-side seal shown in FIG. 3 (b) is a top seal projecting on the surface of the mold base (36) and continuous with each other. It consists of a cooling part (5a), a bottom seal cooling part (5b) and a side seal cooling part (5c). The shape characteristics of each part are the same as those in the heat seal mold (4).

また、上記のヒートシール部冷却金型（５）は、ヒートシール部に冷却を施す際、各ヒートシール部の内縁（１５）（図１参照）に仮に微小バンクが生じていた場合でもその埋没を防止し且つ前記の内縁（１５）を平坦化してその強度を一層高めるため、バッグ内側寄りの角部が曲面に形成された冷却面（５ｓ）を有し、かつ、冷却面（５ｓ）は、バッグ内側寄りの角部に沿う縁部（５０）をシール用受金（３２）に対して後退させた２段構造に構成される。縁部（５０）の幅はシート（１ｓ）の厚さの２５０〜２１００％に設定され、縁部（５０）の後退深さ（段差の深さ）はシート（１ｓ）の厚さの５〜３０％に設定される。   In addition, when the heat seal portion cooling mold (5) is cooled, when the heat seal portion is cooled, even if there is a micro bank on the inner edge (15) (see FIG. 1) of each heat seal portion, In order to further improve the strength of the inner edge (15) by flattening the inner edge (15), the cooling surface (5s) has a cooling surface (5s) in which a corner portion closer to the inner side of the bag is formed into a curved surface. The edge portion (50) along the corner portion on the inner side of the bag is configured in a two-stage structure in which the edge portion (50) is retracted with respect to the seal receiving metal (32). The width of the edge (50) is set to 250 to 2100% of the thickness of the sheet (1s), and the retreat depth (depth of the step) of the edge (50) is 5 to 5% of the thickness of the sheet (1s). Set to 30%.

更に、ヒートシール部冷却金型（５）においては、上記の縁部（５０）がヒートシール金型（４）の加熱面（４ｓ）の縁部（４０）よりも幅広に構成されており、しかも、冷却面（５ｓ）における段差の起点（後退した縁部（５０）への立ち下り部分）は、加熱面（４ｓ）における段差の起点（後退した縁部（４０）への立ち下り部分）に対し、バッグ外側寄りに位置している。すなわち、ヒートシール部を形成する際の押付け位置にあるヒートシール金型（４）と、溶着直後のヒートシール部を冷却する際の押付け位置にあるヒートシール部冷却金型（５）とを比較した場合、冷却面（５ｓ）の段差の起点位置が加熱面（４ｓ）の段差の起点位置よりもバッグ外側寄りにずれている。そして、そのずれ量は、シートの厚さの５０〜２００％に相当する大きさに設定されている。   Furthermore, in the heat seal part cooling mold (5), the edge part (50) is configured wider than the edge part (40) of the heating surface (4s) of the heat seal mold (4), Moreover, the starting point of the step on the cooling surface (5s) (the falling part to the retracted edge (50)) is the starting point of the step on the heating surface (4s) (the falling part to the retracted edge (40)). On the other hand, it is located on the outer side of the bag. That is, the heat seal mold (4) at the pressing position when forming the heat seal portion is compared with the heat seal mold (5) at the pressing position when cooling the heat seal portion immediately after welding. In this case, the starting position of the step on the cooling surface (5s) is shifted to the outside of the bag from the starting position of the step on the heating surface (4s). The amount of deviation is set to a size corresponding to 50 to 200% of the sheet thickness.

ヒートシール部冷却金型（５）においては、冷却面（５ｓ）の縁部（５０）を加熱面（４ｓ）の縁部（４０）よりも幅広に構成し且つ冷却面（５ｓ）の段差を加熱面（４ｓ）の段差よりもバッグ外側寄りにずらすことにより、冷却面（５ｓ）の押付けによって更に拡がるヒートシール時の体積膨張部分（ヒートシール部の内縁（１５））の逃げ代を確保でき、これにより、ヒートシール部を略完全に平坦化でき、脆弱部が形成されるのを防止することが出来る。なお、上記のヒートシール金型（４）の加熱面（４ｓ）及びシール用受金（３２）の表面は、ヒートシールの繰返しによる溶融樹脂の付着を防止するため、フッ素系樹脂で被覆されているのが好ましい。また、ヒートシール部冷却金型（５）の冷却面（５ｓ）は、錆の付着を防止するため、フッ素系樹脂またはクロームメッキ層で被覆される。   In the heat seal portion cooling mold (5), the edge (50) of the cooling surface (5s) is configured wider than the edge (40) of the heating surface (4s), and the step of the cooling surface (5s) is formed. By shifting to the outer side of the bag from the step of the heating surface (4s), it is possible to secure a clearance for the volume expansion part (inner edge (15) of the heat seal part) during heat sealing that further expands by pressing the cooling surface (5s). Thereby, the heat seal part can be flattened almost completely, and the formation of the fragile part can be prevented. The heating surface (4s) of the heat seal mold (4) and the surface of the seal receiving metal (32) are coated with a fluorine resin in order to prevent adhesion of molten resin due to repeated heat sealing. It is preferable. In addition, the cooling surface (5s) of the heat seal portion cooling mold (5) is covered with a fluorine-based resin or a chrome plating layer in order to prevent adhesion of rust.

上記の様に、バック本体（１）の製造においては、特定のヒートシール金型（４）及びヒートシール部冷却金型（５）を使用してラスチックシート積層体（１０）にヒートシールを施すことにより、ヒートシール部におけるシール強度を向上でき、液体充填後にヒートシール部における所謂エッジ切れや伸び切れを生ずることのないバック本体（１）を製造することが出来る。   As described above, in the manufacture of the back body (1), the specific heat seal mold (4) and the heat seal portion cooling mold (5) are used to heat seal the plastic sheet laminate (10). Thus, it is possible to improve the sealing strength in the heat seal portion, and it is possible to manufacture the back body (1) which does not cause the so-called edge cut or elongation cut in the heat seal portion after filling with the liquid.

（II）ポートの製造工程：
ポート（２）の製造工程においては、バック本体（１）の製造工程とは別個に、前述の図４に示す様なポート（２）を製造する。ポート（２）は、射出成形された図５（ａ）に示す様なポート構成部材（２０）を加熱整形することにより製造される。図５（ａ）に示すポート構成部材（２０）は、略円形パイプ状のポート本体（２１）と当該ポート本体の基端側に形成された口栓装着部（２２）とを有し、かつ、ポート本体（２１）の先端側が厚肉の拡径部（２３）に形成されている。ポート本体（２１）は、拡径部（２３）を除き、円形パイプ状に形成される。口栓装着部（２２）は、前述のポート（２）の口栓装着部である。 (II) Port manufacturing process:
In the manufacturing process of the port (2), the port (2) as shown in FIG. 4 is manufactured separately from the manufacturing process of the back body (1). The port (2) is manufactured by heat-shaping a port component (20) as shown in FIG. The port component (20) shown in FIG. 5 (a) has a substantially circular pipe-shaped port body (21) and a plug mounting portion (22) formed on the base end side of the port body, and The distal end side of the port body (21) is formed into a thickened enlarged diameter portion (23). The port body (21) is formed in a circular pipe shape except for the enlarged diameter portion (23). The plug attachment part (22) is the plug attachment part of the port (2) described above.

ポート構成部材（２０）は、有効に機能する張出し片（２３ｐ）を拡径部（２３）に形成するため、ポート本体（２１）の拡径されていない基端側の外径（ｄ０）（図７（ａ）に示す半径（ａ）の２倍）に対し、拡径部（２３）の最大外径（ｄ１）（図７（ａ）に示す半径（ｂ）の２倍）が１．０１〜１．０５倍、ポート本体（２１）の中心線に沿った拡径部（２３）の長さ（ｌ１）が０．６０〜２．５倍、ポート本体（２１）の先端の外径（ｄ２）が１．０〜０．９０倍に設定される。具体的には、ポート本体（２１）の基端側の外径（ｄ０）は８〜２０ｍｍ程度（半径（ａ）は４〜１０ｍｍ程度）、拡径部（２３）の最大外径（ｄ１）は８．３〜２１ｍｍ程度（半径（ｂ）は４．２〜１１ｍｍ程度）、拡径部（２３）の長さ（ｌ１）は１０〜２５ｍｍ程度、先端の外径（ｄ２）は７．２〜１８ｍｍ程度であり、ポート本体（２１）の基端側の肉厚は１．０〜２．５ｍｍ程度である。 The port component (20) has an outer diameter (d 0 ) on the proximal end side of the port main body (21) that is not enlarged in order to form the overhanging piece (23p) that functions effectively in the enlarged diameter portion (23). The maximum outer diameter (d 1 ) of the enlarged diameter portion (23) (twice the radius (b) shown in FIG. 7 (a)) with respect to (twice the radius (a) shown in FIG. 7 (a)). 1.01 to 1.05 times, the length (l 1 ) of the enlarged diameter portion (23) along the center line of the port body (21) is 0.60 to 2.5 times, the tip of the port body (21) The outer diameter (d 2 ) is set to 1.0 to 0.90 times. Specifically, the outer diameter (d 0 ) of the base end side of the port body (21) is about 8 to 20 mm (radius (a) is about 4 to 10 mm), and the maximum outer diameter (d) of the diameter-expanded portion (23). 1 ) is about 8.3 to 21 mm (radius (b) is about 4.2 to 11 mm), the length (l 1 ) of the enlarged diameter portion (23) is about 10 to 25 mm, and the outer diameter (d 2 ) of the tip. Is about 7.2 to 18 mm, and the wall thickness of the base end side of the port body (21) is about 1.0 to 2.5 mm.

本発明においては、ポート構成部材（２０）の拡径部（２３）の大きさを上記の様に設定することにより、前述した適切な大きさの拡径部（２３）及び張出し片（２３ｐ）をポート（２）のポート本体（２１）に形成することが出来、これにより、トップシール部（１２）にポート（２）を溶着した際、ポート本体（２１）の外周面を囲む各シート（１ｓ）の突合せ部分（各シート（１ｓ）の切返し部分（Ｐ））と張出し片（２３ｐ）とをより完全に一体化させることが出来る。そして、上記のポート構成部材（２０）は、ポート本体（２１）の先端側が膨出する拡径部（２３）に形成されているだけであるから、通常の射出成形によって容易に製造することが出来る。   In the present invention, by setting the size of the enlarged diameter portion (23) of the port constituting member (20) as described above, the enlarged diameter portion (23) and the overhanging piece (23p) of the appropriate size described above. Can be formed on the port main body (21) of the port (2), so that when the port (2) is welded to the top seal portion (12), each sheet surrounding the outer peripheral surface of the port main body (21) ( 1 s) butting portion (turned portion (P) of each sheet (1 s)) and overhang piece (23p) can be more completely integrated. And since said port structural member (20) is only formed in the enlarged diameter part (23) which the front end side of a port main body (21) swells, it can manufacture easily by normal injection molding. I can do it.

ポート（２）は、射出成形された上記のポート構成部材（２０）の先端側の拡径部（２３）をポート整形金型装置（７）（図６参照）によって加熱整形することにより製造される。ポート構成部材（２０）の加熱整形においては、成形精度および成形効率を高めるため、図５（ｂ）に示す加熱炉装置（６）を使用し、予め、ポート本体（２１）の拡径部（２３）に加熱処理を施し、拡径部（２３）を半溶融状態にする。   The port (2) is manufactured by heating and shaping the diameter-enlarged portion (23) on the distal end side of the injection-molded port component (20) with a port shaping mold device (7) (see FIG. 6). The In the heating shaping of the port component (20), in order to increase the molding accuracy and molding efficiency, a heating furnace device (6) shown in FIG. 23) is subjected to heat treatment, and the enlarged diameter portion (23) is brought into a semi-molten state.

加熱炉装置（６）は、図５（ｂ）に示す様に、短軸円筒状のケーシングに加熱手段としての電熱ヒーター（６１）を収納して構成される。上記のケーシングの内径（炉内の内径）は、拡径部（２３）の最大外径（ｄ１）の１．２〜１．６倍、ケーシングの軸長（炉内の中心線長さ）は、拡径部（２３）の長さ（ｌ１）の０．９〜１．３倍に設定されており、ケーシングの内周面は、遠赤外線発生用の塗膜でコーティングされている。そして、加熱炉装置（６）の筒内は、溶着工程のサイクルを考慮し、拡径部（２３）の温度がポート構成部材（２０）の構成樹脂の融点に対して−２０〜＋５０℃程度の範囲内の温度、具体的には３５０〜５００℃程度に制御される様になされている。 As shown in FIG. 5B, the heating furnace device (6) is configured by housing an electric heater (61) as a heating means in a short shaft cylindrical casing. The inner diameter of the casing (inner diameter in the furnace) is 1.2 to 1.6 times the maximum outer diameter (d 1 ) of the enlarged diameter portion (23), and the axial length of the casing (center line length in the furnace). Is set to 0.9 to 1.3 times the length (l 1 ) of the enlarged diameter portion (23), and the inner peripheral surface of the casing is coated with a coating film for generating far infrared rays. And in the cylinder of the heating furnace device (6), considering the cycle of the welding process, the temperature of the enlarged diameter portion (23) is about -20 to + 50 ° C with respect to the melting point of the constituent resin of the port constituent member (20). The temperature is controlled within a range of, specifically, about 350 to 500 ° C.

ポート構成部材（２０）に上記の予備加熱処理を施した後は、図６に示す様なポート整形金型装置（７）を使用し、ポート本体（２１）の拡径部（２３）を前述の様な略楕円形断面に整形し、拡径部（２３）に張出し片（２３ｐ）を形成する。ポート整形金型装置（７）は、図６（ａ）に示す様に、例えば上下に対向配置された一対の金型可動機構（７０）から成る。   After performing the above preheating treatment on the port component member (20), the port shaping die device (7) as shown in FIG. 6 is used, and the enlarged diameter portion (23) of the port body (21) is described above. Are shaped into a substantially oval cross section as shown above, and a projecting piece (23p) is formed on the enlarged diameter portion (23). As shown in FIG. 6A, the port shaping mold device (7) is composed of, for example, a pair of mold movable mechanisms (70) arranged to face each other vertically.

各金型可動機構（７０）は、装置架台（７１）に鉛直に取り付けられたシリンダー装置などの駆動手段（７２）と、装置架台（７１）へ常時接近する方向に付勢するトーションバネ等の付勢手段が設けられたガイドを介して装置架台（７１）に支持され且つ駆動手段（７２）によって進退可能に構成された可動板（７３）と、可動板（７３）の表面（駆動手段（７２）と反対側の表面）に配置された金型支持台（７４）と、金型支持台（７４）の先端に装着された整形金型（７ａ）とから主として構成される。整形金型（７ａ）は、例えば直方体ブロック状の金型支持台（７４）の一辺部に配置され、互いに対向する金型支持台（７４）の他の一辺部には、２つの整形金型（７ａ）を正確に型締するため、相互に係合するガイドピン及びガイドブッシュが設けられる。   Each mold movable mechanism (70) includes a driving means (72) such as a cylinder device vertically attached to the device base (71), and a torsion spring that urges the device base (71) in a direction that always approaches the device base (71). A movable plate (73) supported by the apparatus base (71) through a guide provided with an urging means and configured to be advanced and retracted by the drive means (72), and the surface of the movable plate (73) (drive means ( 72) and a shaping die (7a) mounted on the tip of the die support base (74). The shaping mold (7a) is disposed on one side of a rectangular parallelepiped block-shaped mold support (74), for example, and on the other side of the mold support (74) facing each other, two shaping molds are provided. In order to accurately clamp (7a), a guide pin and a guide bush that are engaged with each other are provided.

すなわち、ポート整形金型装置（７）は、相対的に又は相互に接近離間可能な２分割構造の整形金型（７ａ）を備えている。そして、各整形金型（７ａ）の内部には、整形面（７５）の温度を一定に保持するため、電熱ヒーターが設けられる。これにより、整形金型（７ａ）の整形面（７５）は、通常、ポート構成部材（２０）の融点よりも２０〜８０℃高い温度、例えば低密度ポリエチレンの場合で１４５〜２００℃程度に制御される様になされている。   That is, the port shaping die device (7) includes a shaping die (7a) having a two-divided structure that can be relatively or mutually approached and separated. An electric heater is provided inside each shaping die (7a) in order to keep the temperature of the shaping surface (75) constant. Thereby, the shaping surface (75) of the shaping mold (7a) is normally controlled to a temperature 20 to 80 ° C. higher than the melting point of the port component (20), for example, about 145 to 200 ° C. in the case of low density polyethylene. It is made to be done.

各整形金型（７ａ）のパーティング面（Ｌ１）（図７参照）に露出する整形面（７５）は、図６（ｂ）に示す様に、ポート（２）のポート本体（２１）の先端側（図４参照）を当該ポート本体の中心線および両方の張出し片（２３ｐ）の厚さの中心が含まれる様に２分割した形状に彫り込んで構成される。すなわち、各整形金型（７ａ）は、図７に示す様に、各々、張出し片（２３ｐ）に相当する緩やかな曲面から成る窪みがパーティング面（Ｌ１）からの落込み口に設けられた半円筒状の整形面（７５）を有している。なお、図６（ｂ）は、図４（ｃ）に示すポート（２）を製造するための整形金型（７ａ）を例示したものである。 The shaping surface (75) exposed on the parting surface (L 1 ) (see FIG. 7) of each shaping mold (7a) is formed on the port body (21) of the port (2) as shown in FIG. 6 (b). The tip end side (see FIG. 4) is engraved into a shape divided into two so that the center line of the port main body and the center of the thickness of both projecting pieces (23p) are included. That is, as shown in FIG. 7, each shaping die (7a) is provided with a depression formed by a gently curved surface corresponding to the overhanging piece (23p) at the entrance from the parting surface (L 1 ). And a semi-cylindrical shaping surface (75). FIG. 6B illustrates a shaping mold (7a) for manufacturing the port (2) shown in FIG. 4C.

上記の整形面（７５）は、図７（ａ）に示す様に、整形金型（７ａ）を型閉した状態（図７（ｂ）参照）においてポート本体（２１）の中心線（中心（Ｏ）に相当する線）に直交して断面視した場合、特定の劣弧に形成される。具体的には、各整形面（７５）は、以下の式（I）を満足する半径（ｒ１）で且つ中心（Ｏ１）が以下の式（II）を満足する距離（ｄ）だけパーティング面（Ｌ１）よりも外側（他方の整形面（７５）側）にずれた状態の劣弧に形成される。 As shown in FIG. 7 (a), the shaping surface (75) has a center line (center (center)) of the port body (21) in a state where the shaping mold (7a) is closed (see FIG. 7 (b)). When viewed in a cross-section perpendicular to the line corresponding to O), a specific subarc is formed. Specifically, each shaping surface (75) has a radius (r 1 ) that satisfies the following expression (I) and a distance (d) that the center (O 1 ) satisfies the following expression (II). It is formed in an inferior arc in a state shifted to the outer side (the other shaping surface (75) side) than the angling surface (L 1 ).

Figure 2007301751
Figure 2007301751

すなわち、整形面（７５）の中心（Ｏ１）は、各々、整形金型（７ａ）のパーティング面（Ｌ１）に対し、他方の整形面（７５）側へ距離（ｄ）だけずれた位置に設定され、整形面（７５）の半径（ｒ１）は、整形金型（７ａ）のパーティング面（Ｌ１）からの上記のずれの距離（ｄ）だけポート本体（２１）の拡径部（２３）の最大半径（ｂ）よりも大きく設定される。そして、上記のずれの距離（ｄ）は、拡径部（２３）の直径（半径（ｂ）の２倍）とポート本体（２１）の基端側の直径（半径（ａ）の２倍）との差に相当する長さ以下の範囲に設定される。但し、前述した様に、拡径部（２３）の最大半径（ｂ）は、ポート本体（２１）の基端側の半径（ａ）の１．０１〜１．０５倍とされる。 That is, the center (O 1 ) of the shaping surface (75) is shifted from the parting surface (L 1 ) of the shaping die (7a) by the distance (d) toward the other shaping surface (75). The radius (r 1 ) of the shaping surface (75) is set to the position so that the port body (21) is enlarged by the distance (d) of the deviation from the parting surface (L 1 ) of the shaping die (7a). It is set to be larger than the maximum radius (b) of the diameter portion (23). The distance (d) of the deviation is the diameter of the enlarged diameter portion (23) (twice the radius (b)) and the diameter of the base end side of the port body (21) (twice the radius (a)). Is set to a range equal to or less than the length corresponding to the difference. However, as described above, the maximum radius (b) of the enlarged diameter portion (23) is 1.01 to 1.05 times the radius (a) on the proximal end side of the port body (21).

また、ポート本体（２１）に前述の張出し片（２３）を正確に形成するため、張出し片（２３ｐ）を形成する上記の窪みの長さはポート構成部材（２０）の拡径部の長さ（ｌ１）の０．６〜０．９５倍、窪みの深さはシート（１ｓ）の厚さ（ｔ）の０．５〜２．０倍に設定される。なお、整形面（７５）（劣弧）の彫込み最大深さ（Ｃ１）は、拡径部（２３）の半径（ｂ）とポート本体（２１）の半径（ａ）の差（ｂ−ａ）の２倍（拡径部（２３）の直径とポート本体（２１）の基端側の直径との差）以下であって、通常はポート本体（２１）の半径（ａ）の１．９６〜２．０倍に設定される。換言すれば、上記の整形面（７５）は、図７（ｂ）に示す様に、整形金型（７ａ）を型閉した場合、ポート本体（２１）の中心線に直交する断面がポート本体（２１）の拡径部（２３）の半径（ｂ）よりも大きな半径（ｒ１）の劣弧を突き合せた形状の整形空間を形成する様に構成されている。 In addition, in order to accurately form the above-mentioned overhanging piece (23) in the port body (21), the length of the above-mentioned recess forming the overhanging piece (23p) is the length of the enlarged diameter portion of the port component (20). (L 1 ) is set to 0.6 to 0.95 times, and the depth of the depression is set to 0.5 to 2.0 times the thickness (t) of the sheet (1 s). The maximum engraving depth (C 1 ) of the shaping surface (75) (subordinate arc) is the difference between the radius (b) of the enlarged diameter portion (23) and the radius (a) of the port body (21) (b− It is less than twice (a) the difference between the diameter of the enlarged diameter portion (23) and the diameter of the base end side of the port body (21), and is usually 1. It is set to 96 to 2.0 times. In other words, as shown in FIG. 7B, the shaping surface (75) has a cross section perpendicular to the center line of the port body (21) when the shaping mold (7a) is closed. A shaping space having a shape in which a subarc of a radius (r 1 ) larger than the radius (b) of the enlarged diameter portion (23) of (21) is abutted is formed.

上記の様に、ポート（２）の製造工程においては、先端がピン状のポート支持治具（６２）（図６（ａ）参照））で支持したポート構成部材（２０）を図５（ｂ）に示す様な加熱炉装置（６）に装入し、予め、ポート本体（２１）に加熱処理を施してその拡径部（２３）を半溶融状態にした後、図６（ａ）に示す様に、ポート整形金型装置（７）にポート構成部材（２０）を装填し、整形金型（７ａ）の型締操作を行い、拡径部（２３）及び張出し片（２３ｐ）を整形する。型締操作においては、各整形金型（７ａ）の間にポート構成部材（２０）を位置させた後、各駆動手段（７２）を作動させ、各整形金型（７ａ）を当接させる。上記のポート製造工程では、通常の射出成形で簡単に成形し得るポート構成部材（２０）を整形金型（７ａ）で整形するだけで、寸法精度の高いポート（２）を効率的に製造することが出来る。   As described above, in the manufacturing process of the port (2), the port component member (20) supported by the port support jig (62) having a pin-like tip (see FIG. 6 (a)) is shown in FIG. ) And then preheating the port body (21) to make the enlarged diameter portion (23) in a semi-molten state, and then to FIG. 6 (a). As shown, the port shaping member (7) is loaded with the port component (20), the shaping die (7a) is clamped, and the enlarged diameter portion (23) and the overhanging piece (23p) are shaped. To do. In the mold clamping operation, after the port constituting member (20) is positioned between the shaping dies (7a), the driving means (72) are operated to bring the shaping dies (7a) into contact. In the above-described port manufacturing process, the port component (20) that can be easily molded by ordinary injection molding is simply shaped by the shaping die (7a), thereby efficiently producing the port (2) with high dimensional accuracy. I can do it.

（III）ポート（２）の溶着工程：
上記の様にして得られたポート（２）は、図８（ａ）に示す様に、その円形パイプ状のポート本体（２１）を前述のバック本体（１）の例えばトップシール部（１２）に形成されたポート挿入穴（１２ｃ）に挿入して溶着固定する。そして、ポート（２）の溶着においては、ポート溶着部（１２ｂ）における各シート（１ｓ）同士の平面状に溶着される部位と各シート（１ｓ）のポート本体半周面に溶着される部位との切返し部分（Ｐ）（図８（ｂ）参照）を鈍角状に緩やかに屈曲させた状態に形成し、切返し部分（Ｐ）の薄肉化を防止するため、図９〜図１１に示す様に、相対的に又は相互に接近離間可能な２分割構造の溶着用の加熱金型（８１）を備えたポート溶着用のヒートシール金型装置（８）が使用される。 (III) Port (2) welding process:
As shown in FIG. 8A, the port (2) obtained as described above is connected to the circular pipe-shaped port main body (21) such as the top seal portion (12) of the back main body (1). It is inserted into the port insertion hole (12c) formed in the above and fixed by welding. And in welding of a port (2), the site | part welded in the planar form of each sheet | seat (1s) in a port weld part (12b), and the site | part welded to the port main body half peripheral surface of each sheet | seat (1s) As shown in FIGS. 9 to 11, in order to prevent the thinning of the turning portion (P) by forming the turning portion (P) (see FIG. 8 (b)) in a state of being bent gently in an obtuse angle, A heat-sealing mold apparatus (8) for port welding provided with a heating mold (81) for welding having a two-divided structure that is relatively or close to and away from each other is used.

更に、ポート（２）の溶着工程においては、図８（ａ）に示す様に、トップシール部（１２）のポート挿入穴（１２ｃ）にポート（２）のポート本体（２１）を挿入した場合、ポート挿入穴（１２ｃ）に対してバック本体（１）の中央部側に隣接する部位の各シート（１ｓ）が互いに離間する方向に膨らみ、半円筒状に湾曲する。一方、ポート挿入穴（１２ｃ）を形成する各シート（１ｓ）は、ポート本体（２１）の周面に溶着され且つポート本体（２１）の両側ではシート同士が平面状に溶着される。そして、上記の切返し部分（Ｐ）のポート本体（２１）の先端側に位置する端部と、上記の半円筒状に湾曲した非溶着部との境界部分においては、溶着直後に、互いに離間する方向（膨らみ方向）への各シート（１ｓ）の復元力が界面に作用し、当該界面が薄肉化してピンホールが発生し易くなる。そこで、本発明においては、ポート（２）を溶着する際、ポート挿入穴（１２ｃ）のバック本体（１）中央部側に隣接する上記の非溶着部を軟化させるため、ヒートシール金型装置（８）に加温用の補助金型（８５）が併設される。   Further, when the port (2) is welded, as shown in FIG. 8 (a), when the port body (21) of the port (2) is inserted into the port insertion hole (12c) of the top seal portion (12). Each sheet (1s) at a portion adjacent to the center side of the back body (1) with respect to the port insertion hole (12c) swells in a direction away from each other, and is curved into a semi-cylindrical shape. On the other hand, each sheet (1s) forming the port insertion hole (12c) is welded to the peripheral surface of the port body (21), and the sheets are welded to each other on both sides of the port body (21). And in the boundary part of the edge part located in the front end side of the port main body (21) of said turning part (P), and the said non-welding part curved in the semi-cylindrical form, it mutually spaces apart immediately after welding. The restoring force of each sheet (1s) in the direction (swelling direction) acts on the interface, and the interface is thinned to easily generate pinholes. Therefore, in the present invention, when the port (2) is welded, in order to soften the non-welded portion adjacent to the center side of the back body (1) of the port insertion hole (12c), a heat seal mold device ( 8) is provided with an auxiliary mold (85) for heating.

ヒートシール金型装置（８）は、図９に示す様に、バック本体（１）のトップシール部（１２）を表裏から挟み付ける２分割構造の金型装置であり、図９（ｂ）に示す様に、シリンダー装置などの駆動手段（図示省略）によって相対的に又は相互に接近離間可能に構成された２分割構造の溶着用の加熱金型（８１）と、当該加熱金型と共に接近離間可能な２分割構造の加温用の補助金型（８５）とを組み合わせて構成される。具体的には、ヒートシール金型装置（８）は、相対的に又は相互に接近離間可能になされた平板状の一対の金型基台（８４）の互いに対向する盤面に加熱金型（８１）及び補助金型（８５）を配置して構成される。   As shown in FIG. 9, the heat seal mold apparatus (8) is a mold apparatus having a two-part structure in which the top seal portion (12) of the back body (1) is sandwiched from the front and back sides. As shown in the figure, a two-part welded heating mold (81) configured to be relatively close to each other or driven by a driving means (not shown) such as a cylinder device, and approaching and separating together with the heating mold. It is configured by combining with a possible auxiliary mold (85) for heating having a two-part structure. Specifically, the heat-sealing mold apparatus (8) is configured such that the heating mold (81) is placed on the opposing plate surfaces of a pair of flat plate-shaped mold bases (84) that can be moved relatively close to each other. ) And an auxiliary mold (85).

加熱金型（８１）は、図８（ｂ）に示す様に、トップシール部（１２）のポート挿入穴（１２ｃ）を構成する２枚シート（１ｓ）とポート（２）のポート本体（２１）とを溶着する金型であり、加熱金型（８１）の内部には、加熱手段としての電熱ヒーターが挿入されている。そして、図１０に示す様に、加熱金型（８１）のパーティング面である加熱面、すなわち、後述するシート部加熱面（８２）及びポート部加熱面（８３）は、プラスチックシート積層体（１０）のシート（１ｓ）の融点よりも２０〜８０℃高い温度、例えば低密度ポリエチレンの場合で１４５〜２００℃程度に制御される様になされている。   As shown in FIG. 8 (b), the heating mold (81) includes two sheets (1s) constituting a port insertion hole (12c) of the top seal portion (12) and a port body (21) of the port (2). ), And an electric heater as a heating means is inserted inside the heating mold (81). And as shown in FIG. 10, the heating surface which is a parting surface of the heating mold (81), that is, a sheet heating surface (82) and a port heating surface (83) described later are formed of a plastic sheet laminate ( In the case of low density polyethylene, the temperature is controlled to be about 145 to 200 ° C. higher than the melting point of the sheet (1s) of 10).

各加熱金型（８１）は、各々、図１０に示す様に、トップシール部（１２）のポート挿入穴（１２ｃ）の両側の平面部分に当接する２つのシート部加熱面（８２）と、これらシート部加熱面（８２）の間に設けられ且つポート本体（２１）の挿入部分に当接する半円筒状のポート部加熱面（８３）とから構成される。各シート部加熱面（８２）は、先にヒートシールされたトップシール部（１２）の内側端部（ポート挿入穴の外側部分）と重畳する位置まで拡げられている。通常、各シート部加熱面（８２）の長さ（ポート本体（２１）の長さ方向に沿った長さ）は６〜１８ｍｍ程度であり、シート部加熱面（８２）の幅（ポート本体（２１）の長さ方向に直交する方向の長さ）は１０〜３０ｍｍ程度である。   As shown in FIG. 10, each heating mold (81) has two sheet part heating surfaces (82) that abut on the planar portions on both sides of the port insertion hole (12c) of the top seal part (12), A semi-cylindrical port portion heating surface (83) provided between the sheet portion heating surfaces (82) and abutting against an insertion portion of the port main body (21). Each sheet portion heating surface (82) is expanded to a position overlapping with the inner end portion (outer portion of the port insertion hole) of the top seal portion (12) heat-sealed first. Usually, the length of each sheet part heating surface (82) (the length along the length direction of the port body (21)) is about 6 to 18 mm, and the width of the sheet part heating surface (82) (port body ( 21) is about 10 to 30 mm in length in the direction perpendicular to the length direction.

加熱金型（８１）においては、トップシール部（１２）及び張出し片（２３ｐ）の肉厚を必要以上に損なうことなく、かつ、ポート挿入穴（１２ｃ）を形成する２枚のシート（１ｓ）をポート本体（２１）の外周面に確実に溶着し、しかも、ポート本体（２１）の周りの各シート（１ｓ）の突合せ部分をポート本体（２１）の張出し片（２３ｐ）に確実に溶着一体化するため、ポート部加熱面（８３）が特定の形状および大きさに設定される。   In the heating mold (81), the two sheets (1s) forming the port insertion hole (12c) without damaging the thickness of the top seal portion (12) and the overhanging piece (23p) more than necessary. Is securely welded to the outer peripheral surface of the port body (21), and the butted portions of the sheets (1s) around the port body (21) are securely welded to the projecting piece (23p) of the port body (21). Therefore, the port portion heating surface (83) is set to a specific shape and size.

加熱金型（８１）のポート部加熱面（８３）は、図１１（ａ）に示す様に、加熱金型（８１）の型閉した状態において（図１１（ｂ）参照）ポート本体（２１）の中心線（中心（Ｏ）に相当する線）に直交して断面視した場合、特定の劣弧に形成される。具体的には、各ポート部加熱面（８３）は、以下の式（III）を満足する半径（ｒ２）で且つ中心（Ｏ２）が以下の式（IV）を満足する距離（ｄ２）だけパーティング面（Ｌ２）よりも外側にずれた状態の劣弧に形成される。 As shown in FIG. 11 (a), the port heating surface (83) of the heating mold (81) is in a state where the heating mold (81) is closed (see FIG. 11 (b)). ) In a cross-sectional view perpendicular to the center line (line corresponding to the center (O)), a specific subarc is formed. Specifically, each port portion heating surface (83) has a radius (r 2 ) that satisfies the following formula (III) and a distance (d 2 ) that the center (O 2 ) satisfies the following formula (IV). ) Is formed in a subarc that is shifted outward from the parting surface (L 2 ).

Figure 2007301751
Figure 2007301751

すなわち、ポート部加熱面（８３）の中心（Ｏ２）は、各々、加熱金型（８１）のパーティング面（Ｌ２）に対し、他方のポート部加熱面（８３）側へ距離（ｄ２）だけずれた位置に設定され、ポート部加熱面（８３）の半径（ｒ２）は、加熱金型（８１）のパーティング面（Ｌ２）からの上記のずれの距離（ｄ２）だけポート本体（２１）の整形後の拡径部（２３）の最大半径（ｒ１）（前述のポート整形金型装置（７）における整形金型（７ａ）の整形面（７５）の半径）よりも大きく設定される。しかも、対向するシート部加熱面（８２）の離間距離は、上記のずれの距離（ｄ２）の２倍（プラスチックシート（１ｓ）の厚さ（ｔ）の１．６〜２．２倍に相当する距離）に設定される。そして、上記のずれの距離（ｄ２）は、シート（１ｓ）の厚さ（ｔ）の０．８〜１．１倍に相当するの範囲に設定される。 That is, the center (O 2 ) of the port portion heating surface (83) is a distance (d) toward the other port portion heating surface (83) side with respect to the parting surface (L 2 ) of the heating mold (81). 2 ) and the radius (r 2 ) of the port portion heating surface (83) is the distance (d 2 ) of the above-mentioned deviation from the parting surface (L 2 ) of the heating mold (81). Only the maximum radius (r 1 ) of the enlarged diameter portion (23) after shaping of the port body (21) (the radius of the shaping surface (75) of the shaping die (7a) in the aforementioned port shaping die device (7)) Is set larger than. Moreover, the separation distance between the opposed sheet heating surfaces (82) is twice the above-mentioned displacement distance (d 2 ) (1.6 to 2.2 times the thickness (t) of the plastic sheet (1s). Equivalent distance). Then, the distance (d 2 ) of the deviation is set to a range corresponding to 0.8 to 1.1 times the thickness (t) of the sheet (1s).

換言すれば、各加熱金型（８１）は、型閉した場合、ポート部加熱面（８３）において、２つの劣弧を組み合わせた断面形状に予め整形されたポート本体（２１）の拡径部（２３）の外周に対してシート（１ｓ）の厚さ（ｔ）の０．８〜１．１倍に相当する隙間を形成し、かつ、シート部加熱面（８２）において、他方のシート部加熱面（８２）との間にシート（１ｓ）の厚さ（ｔ）の１．６〜２．２倍に相当する隙間を形成する様に構成されている。通常、ポート部加熱面（８３）の半径（ｒ２）は、整形後の拡径部（２３）の半径（ｒ１）（ポート整形金型装置（７）における整形金型（７ａ）の整形面（７５）の半径）にシート（１ｓ）の厚さ（ｔ）を加えた寸法の１．００５〜１．０５０倍に設定される。なお、図１１中の符号（ｔ２）はポート（２）溶着後のシート（１ｓ）の厚さを示す。 In other words, when the heating mold (81) is closed, the enlarged diameter portion of the port body (21) shaped in advance into a cross-sectional shape combining two subarcs on the port heating surface (83). A gap corresponding to 0.8 to 1.1 times the thickness (t) of the sheet (1s) is formed with respect to the outer periphery of (23), and the other sheet part is formed on the sheet part heating surface (82). A gap corresponding to 1.6 to 2.2 times the thickness (t) of the sheet (1s) is formed between the heating surface (82) and the heating surface (82). Usually, the radius (r 2 ) of the port portion heating surface (83) is the radius (r 1 ) of the enlarged diameter portion (23) after shaping (the shaping of the shaping die (7a) in the port shaping die apparatus (7)). The radius is set to 1.005 to 1.050 times the dimension obtained by adding the thickness (t) of the sheet (1s) to the radius of the surface (75). Reference numeral (t 2) in FIG. 11 shows the thickness of the port (2) after the welding of the sheet (1s).

上記の様に、ポート部加熱面（８３）は、図１１（ｂ）に示す様に加熱金型（８１）を型閉した場合、ポート本体（２１）の中心線に直交する断面がポート本体（２１）の拡径部（２３）の半径（ｂ）よりも大きな半径（ｒ２）の半円に満たない劣弧を突き合せた形状の加熱空間を形成する様に構成されている。ポート整形金型装置（７）の整形金型（７ａ）を上記の様に設定することにより、ポート（２）を溶着した際、各シート（１ｓ）同士の平面状に溶着された部位と各シート（１ｓ）のポート本体（２１）半周面に溶着された部位との切返し部分（Ｐ）を鈍角状に屈曲させ、切返し部分（Ｐ）のシート（１ｓ）の厚さを十分に確保することが出来る。 As described above, when the heating die (81) is closed as shown in FIG. 11B, the port portion heating surface (83) has a cross section perpendicular to the center line of the port body (21). It is configured to form a heating space having a shape in which an inferior arc less than a semicircle having a radius (r 2 ) larger than the radius (b) of the enlarged diameter portion (23) of (21) is abutted. By setting the shaping mold (7a) of the port shaping mold apparatus (7) as described above, when the port (2) is welded, the parts welded in a planar shape between the sheets (1s) and each Bending the turning part (P) of the sheet (1s) with the part welded to the half peripheral surface of the port body (21) to an obtuse angle to ensure a sufficient thickness of the sheet (1s) of the turning part (P). I can do it.

更に、シート部加熱面（８２）からポート部加熱面（８３）への落込み口には、ポート（２）の拡径部（２３）の張出し片（２３ｐ）にシート（１ｓ）を確実に溶着するため、張出し片（２３ｐ）に倣った形状の窪みが設けられる。窪みの深さはシート（１ｓ）の厚さ（ｔ）の０．５〜２．０倍程度である。また、ポート部加熱面（８３）の彫込み最大深さ（Ｃ２）は、整形前の拡径部（２３）の半径（ｂ）とポート本体（２１）の半径（ａ）の差（ｂ−ａ）の２倍以下であって、通常はポート本体（２１）の半径（ａ）の１．９６〜２．０倍に設定される。 Further, the sheet (1 s) is securely attached to the projecting piece (23p) of the enlarged diameter portion (23) of the port (2) at the entrance of the port portion heating surface (83) from the sheet portion heating surface (82). In order to weld, the hollow of the shape which followed the overhang | projection piece (23p) is provided. The depth of the depression is about 0.5 to 2.0 times the thickness (t) of the sheet (1s). The maximum engraving depth (C 2 ) of the port portion heating surface (83) is the difference between the radius (b) of the enlarged diameter portion (23) before shaping and the radius (a) of the port body (21) (b It is set to be 1.96 to 2.0 times the radius (a) of the port body (21) or less, usually not more than 2 times -a).

また、各シート部加熱面（８２）の縁部（図１０参照）は、当該シート部加熱面よりも後退した高さの後述するシート部加温面（８６）と同等の高さまで漸次傾斜しているのが好ましい。シート部加熱面（８２）縁部の傾斜部分の傾斜角度（シート部加熱面（８２）の中央の平坦部分を基準としたときの後退角度）は２〜２０度であり、傾斜部分の幅はシート（１ｓ）の厚さの５〜２０倍である。上記の様に、シート部加熱面（８２）の縁部を傾斜構造とすることにより、シート部加熱面（８２）で押え付けた際に、非溶着部のシート（１ｓ）の復元力（引張応力）が溶着部（１２ｂ）の周縁部分に集中するのを回避でき、前述の境界部分における薄肉化を一層防止できる。更に、加熱金型（８１）のシート部加熱面（８２）には、四角錐状の凹凸加工やローレット加工が施されてもよい。上記の様な加工が施されている場合には、溶着部（１２ｂ）の溶着強度を一層高めることが出来る。   Further, the edge portion (see FIG. 10) of each sheet portion heating surface (82) is gradually inclined to a height equivalent to a later-described sheet portion heating surface (86) whose height is set back from the sheet portion heating surface. It is preferable. The inclination angle of the inclined portion of the edge portion of the sheet portion heating surface (82) (the receding angle with respect to the flat portion at the center of the sheet portion heating surface (82)) is 2 to 20 degrees, and the width of the inclined portion is It is 5 to 20 times the thickness of the sheet (1 s). As described above, the edge of the sheet heating surface (82) has an inclined structure, so that when the sheet heating surface (82) is pressed down, the restoring force (tensile) of the sheet (1s) in the non-welded portion Stress) can be avoided from concentrating on the peripheral portion of the welded portion (12b), and thinning at the boundary portion can be further prevented. Further, the sheet portion heating surface (82) of the heating mold (81) may be subjected to a quadrangular pyramid uneven process or knurling process. When the above processing is performed, the welding strength of the welded portion (12b) can be further increased.

一方、補助金型（８５）は、図８（ｂ）に示す様に、プラスチックシート積層体（１０）をポート本体（２１）に溶着する際に、少なくとも、ポート挿入穴（１２ｃ）に対してバック本体（１）の中央側に隣接する半円筒状に湾曲した非溶着部のプラスチックシート積層体（１０）を融点未満の一定温度に加温して軟化させるための金型であり、補助金型（８５）の内部は、加熱装置および冷却装置を備えた温度調節手段としての温水循環器または温油循環器に管路で接続されることにより、温水または温油を循環可能に構成される。そして、図１０に示す様に、補助金型（８５）のパーティング面である加温面、すなわち、後述するシート部加温面（８６）及び湾曲部加温面（８７）は、プラスチックシート積層体（１０）のシート（１ｓ）の融点よりも２０〜７０℃程度低い温度、例えば低密度ポリエチレンの場合で１０５〜７５℃程度に制御される様になされている。   On the other hand, as shown in FIG. 8 (b), the auxiliary mold (85) has at least the port insertion hole (12c) when the plastic sheet laminate (10) is welded to the port body (21). Non-welded plastic sheet laminate (10) curved in a semi-cylindrical shape adjacent to the center side of the back body (1) is a mold for heating and softening to a certain temperature below the melting point, and an auxiliary metal The interior of the mold (85) is configured to be able to circulate hot water or hot oil by being connected to a hot water circulator or a hot oil circulator as a temperature adjusting means including a heating device and a cooling device by a pipe line. . And as shown in FIG. 10, the heating surface which is a parting surface of the auxiliary mold (85), that is, a sheet portion heating surface (86) and a curved portion heating surface (87) described later are plastic sheets. The temperature is about 20 to 70 ° C. lower than the melting point of the sheet (1s) of the laminate (10), for example, about 105 to 75 ° C. in the case of low density polyethylene.

各補助金型（８５）の上記の加温面は、上記の加熱金型（８１）の加熱面に対して少なくともバック本体（１）の中央側に相当する側に隣接して設けられる必要があり、通常は加熱金型（８１）の加熱面を囲む状態で当該加熱面の外周側に設けられる。具体的には、補助金型（８５）の加温面は、図１０に示す様に、トップシール部（１２）のポート挿入穴（１２ｃ）の両側平面部分（溶着部（１２ｂ）の平坦部分）に隣接する部位に当接する２つのシート部加温面（８６）と、これらシート部加温面の間に設けられ且つポート本体（２１）の挿入部分の一部及び当該挿入部分に隣接する非溶着部（図８（ａ）に示す溶着部（１２ｂ）に隣接する半円筒状の湾曲部位）に当接する半円筒状の湾曲部加温面（８７）とから構成される。なお、上記のポート本体（２１）の挿入部分の一部とは、図１０において左側のトップシール部（１２）のポート挿入穴（１２ｃ）の入口部分を指し、上記の非溶着部とは、図１０において右側のポート挿入穴（１２ｃ）に対してバック本体（１）の中央側に隣接する部分を指す。   The heating surface of each auxiliary mold (85) needs to be provided adjacent to at least the side corresponding to the center side of the back body (1) with respect to the heating surface of the heating mold (81). There is usually provided on the outer peripheral side of the heating surface in a state of surrounding the heating surface of the heating mold (81). Specifically, as shown in FIG. 10, the heating surface of the auxiliary mold (85) is a flat portion on both sides of the port insertion hole (12 c) of the top seal portion (12) (the flat portion of the weld portion (12 b)). ) Two sheet part heating surfaces (86) abutting on a part adjacent to the sheet part, and a part of the insertion portion of the port body (21) provided adjacent to the sheet part heating surface and adjacent to the insertion portion. It is comprised from the semi-cylindrical curved part heating surface (87) which contact | abuts a non-welding part (semi-cylindrical curved site | part adjacent to the welding part (12b) shown to Fig.8 (a)). The part of the insertion portion of the port body (21) refers to an inlet portion of the port insertion hole (12c) of the left top seal portion (12) in FIG. 10, and the non-welded portion is In FIG. 10, it refers to a portion adjacent to the center side of the back body (1) with respect to the right port insertion hole (12c).

補助金型（８５）のシート部加温面（８６）は、上記の非溶着部を不自然に変形させることのない様に、前述の加熱金型（８１）のシート部加熱面（８２）に対し、ヒートシール金型装置（８）のパーティング面から離れる方向に僅かに後退した位置に配置される。各補助金型（８５）が最接近した状態における各シート部加温面（８６）の相互の前記のパーティング面からの離間距離は、シート（１ｓ）の厚さ（ｔ）の０．９０〜１．３倍に相当する距離とされる。   The sheet portion heating surface (86) of the auxiliary mold (85) is provided so that the non-welded portion is not unnaturally deformed. On the other hand, it arrange | positions in the position slightly retracted in the direction away from the parting surface of a heat seal metal mold | die apparatus (8). In the state where each auxiliary mold (85) is closest, each sheet portion heating surface (86) is spaced apart from the above parting surface by 0.90 of the thickness (t) of the sheet (1s). The distance is equivalent to ˜1.3 times.

また、湾曲した非溶着部のシート（１ｓ）を損傷することなく且つシート（１ｓ）を適度な力で押え付けて加温効果を発揮するため、補助金型（８５）の湾曲部加温面（８７）の直径は、加熱金型（８１）のポート部加熱面（８３）の直径の１．０１〜１．１０倍に設定される。更に、ポート（２）の溶着の際、前述の境界部分に対する非溶着部の復元力を十分に抑制するため、湾曲部加温面（８７）の長さ（ポート本体（２１）の長さ方向に沿った長さ）は、ポート本体（２１）の直径の１．０〜３．５倍に設定される。特に、湾曲部加温面（８７）の長さが上記の範囲よりも短い場合は、シート（１ｓ）を押え付ける力が不足するため好ましくない。   Further, in order to exert a heating effect by pressing the sheet (1s) with an appropriate force without damaging the curved sheet (1s) of the non-welded portion, the curved portion heating surface of the auxiliary mold (85) The diameter of (87) is set to 1.01 to 1.10 times the diameter of the port portion heating surface (83) of the heating mold (81). Furthermore, when the port (2) is welded, the length of the curved portion heating surface (87) (the length direction of the port body (21) is sufficiently reduced in order to sufficiently suppress the restoring force of the non-welded portion with respect to the boundary portion described above. (Length along the length) is set to 1.0 to 3.5 times the diameter of the port body (21). In particular, when the length of the curved portion heating surface (87) is shorter than the above range, the force for pressing the sheet (1s) is insufficient, which is not preferable.

更に、ヒートシール金型装置（８）においては、上記の様な加熱金型（８１）と補助金型（８５）の温度を個別に制御するため、図１０に示す様に、加熱金型（８１）と補助金型（８５）とが隙間（ｎ）を介して金型基台（８４）に配置される。そして、上記の隙間（ｎ）の大きさは、シート（１ｓ）の厚さの１〜１０倍に相当する大きさに設定される。   Further, in the heat seal mold apparatus (8), the temperatures of the heating mold (81) and the auxiliary mold (85) as described above are individually controlled, so that as shown in FIG. 81) and the auxiliary mold (85) are arranged on the mold base (84) through the gap (n). The size of the gap (n) is set to a size corresponding to 1 to 10 times the thickness of the sheet (1s).

加熱金型（８１）と補助金型（８５）との隙間（ｎ）を上記の範囲に設定する理由は次の通りである。すなわち、隙間（ｎ）が上記の範囲より小さい場合は、溶融したシート（１ｓ）の一部が隙間（ｎ）に入り込み、円滑に型開操作できなくなり、シート（１ｓ）が破れる虞がある。他方、隙間（ｎ）が上記の範囲より大きい場合は、前述の境界部分におけるシート（１ｓ）の復元力を十分に抑制できない。隙間（ｎ）に入り込む溶融樹脂の量やシート（１ｓ）の復元力の大きさはシート（１ｓ）の厚さに依存し、隙間（ｎ）の大きさは上記の範囲が好ましい。上記の様に、加熱金型（８１）と補助金型（８５）の間に所定の大きさの隙間（ｎ）を設けることにより、非溶着部が必要以上に加熱されるのを防止でき、かつ、境界部分の溶着部端部と非溶着部との界面における薄肉化を確実に防止できる。   The reason why the gap (n) between the heating mold (81) and the auxiliary mold (85) is set in the above range is as follows. That is, when the gap (n) is smaller than the above range, a part of the melted sheet (1s) enters the gap (n), the mold opening operation cannot be smoothly performed, and the sheet (1s) may be broken. On the other hand, when the gap (n) is larger than the above range, the restoring force of the sheet (1s) at the boundary portion cannot be sufficiently suppressed. The amount of molten resin entering the gap (n) and the magnitude of the restoring force of the sheet (1s) depend on the thickness of the sheet (1s), and the magnitude of the gap (n) is preferably in the above range. As described above, by providing a gap (n) of a predetermined size between the heating mold (81) and the auxiliary mold (85), the non-welded portion can be prevented from being heated more than necessary. And the thinning in the interface of the welding part edge part of a boundary part and a non-welding part can be prevented reliably.

上記の様に、ポート（２）の溶着工程においては、トップシール部（１２）のポート挿入穴（１２ｃ）にポート（２）のポート本体（２１）を挿入した後、上記の様な特定の加熱金型（８１）を備えたヒートシール金型装置（８）を使用し、図１１（ｂ）に示す様に、ポート本体（２１）の拡径部（２３）の長径を加熱金型（８１）のパーティング面（Ｌ２）に揃え且つポート挿入穴（１２ｃ）を形成するプラスチックシート積層体（１９）の２枚のシート（１ｓ）によって拡径部（２３）を挟み込んだ状態でプラスチックシート積層体（１０）を加熱溶融することによりポート本体（２１）を溶着する。その際、本発明では、加熱金型（８１）の押え付けにより、ポート溶着部（１２ｂ）に形成される切返し部分（Ｐ）、すなわち、各シート（１ｓ）同士の平面状に溶着された部位と各シート（１ｓ）のポート本体（２１）半周面に溶着された部位との切返し部分（Ｐ）を鈍角状に屈曲させるため、切返し部分（Ｐ）におけるシート（１ｓ）の厚さを十分に確保することが出来る。 As described above, in the welding process of the port (2), after inserting the port body (21) of the port (2) into the port insertion hole (12c) of the top seal portion (12), Using the heat sealing mold apparatus (8) provided with the heating mold (81), the major diameter of the enlarged diameter part (23) of the port body (21) is changed to the heating mold (as shown in FIG. 11B). 81) with the enlarged diameter portion (23) sandwiched between two sheets (1s) of the plastic sheet laminate (19) which is aligned with the parting surface (L 2 ) of 81) and forms a port insertion hole (12c). The port body (21) is welded by heating and melting the sheet laminate (10). At that time, in the present invention, the cut-back portion (P) formed in the port weld portion (12b) by pressing the heating mold (81), that is, the portion welded in a planar shape between the sheets (1s). In order to bend the turning portion (P) between the portion welded to the half circumferential surface of the port body (21) of each sheet (1s) with an obtuse angle, the thickness of the sheet (1s) at the turning portion (P) is sufficiently Can be secured.

また、ポート（２）の溶着工程においては、ポート挿入穴（１２ｃ）に相当するシート（１ｓ）を加熱金型（８１）によって加熱溶融する間、ポート挿入穴（１２ｃ）に対してバック本体（１）の中央側に隣接する部位のプラスチックシート積層体（１０）、換言すれば、トップシール部（１２）に隣接する非溶着部の２枚のシート（１ｓ）を補助金型（８５）によって融点未満の温度に加温して軟化させる。ポート挿入穴（１２ｃ）およびその両側部分を加熱金型（８１）により例えば１４５〜２００℃程度で加熱する間、少なくともトップシール部（１２）に隣接する非溶着部を補助金型（８５）により例えば７５〜１０５℃程度で加温する。ヒートシール金型装置（８）による加熱・加温時間は３．５〜６．０秒程度である。上記の加温により、トップシール部（１２）に隣接する半円筒状に湾曲した非溶着部の剛性を低下させ、上記の境界部分に作用する復元力を緩和できるため、斯かる境界部分の薄肉化を防止でき、トップシール部（１２）にポート（２）を強固に溶着することが出来る。   Further, in the step of welding the port (2), while the sheet (1s) corresponding to the port insertion hole (12c) is heated and melted by the heating mold (81), the back body ( 1) The plastic sheet laminate (10) at the part adjacent to the center side, in other words, the two sheets (1s) of the non-welded part adjacent to the top seal part (12) are provided by the auxiliary mold (85). Soften by warming to a temperature below the melting point. While the port insertion hole (12c) and both side portions thereof are heated by the heating die (81) at, for example, about 145 to 200 ° C., at least the non-welded portion adjacent to the top seal portion (12) is provided by the auxiliary die (85). For example, it heats at about 75-105 degreeC. The heating / heating time by the heat seal mold apparatus (8) is about 3.5 to 6.0 seconds. The above heating reduces the rigidity of the semi-cylindrical non-welded portion adjacent to the top seal portion (12) and can relax the restoring force acting on the boundary portion. The port (2) can be firmly welded to the top seal portion (12).

更に、図示しないが、トップシール部（１２）のポート挿入穴（１２ｃ）にポート（２）を溶着した後は、バック製造工程からプラスチックバック（１Ａ）を迅速に取り出すため、溶着部（１２ｂ）を更に冷却用金型装置によって冷却してもよい。斯かる冷却用金型装置としては、相対的に又は相互に接近離間可能な２分割構造の冷却金型を備えた装置が使用される。斯かる冷却金型の形状は前述の加熱金型（８１）と略同様であり、各冷却金型は、溶着部（１２ｂ）のポート挿入穴（１２ｃ）の両側部分に当接する２つの平面状のシート部冷却面と、これらシート部冷却面の間に設けられてポート本体（２１）の挿入部分に当接する半円筒状のポート部冷却面とから構成される。   Further, although not shown, after the port (2) is welded in the port insertion hole (12c) of the top seal portion (12), the welded portion (12b) is used to quickly take out the plastic bag (1A) from the bag manufacturing process. May be further cooled by a cooling mold apparatus. As such a cooling mold apparatus, an apparatus provided with a cooling mold having a two-divided structure that can be moved relatively close to each other is used. The shape of such a cooling mold is substantially the same as that of the heating mold (81) described above, and each cooling mold has two planar shapes that are in contact with both side portions of the port insertion hole (12c) of the welded portion (12b). And a semi-cylindrical port portion cooling surface provided between the sheet portion cooling surfaces and abutting against the insertion portion of the port body (21).

ポート部冷却面は、冷却金型の型閉した状態においてポート本体の中心線に直交して断面視した場合、特定の劣弧に形成される。具体的には、冷却用金型装置において、各ポート部冷却面は、シート（１ｓ）の当初の厚さ（ｔ）から収縮分を差し引いた厚さに相当する距離だけ冷却金型のパーティング面に対して他方のポート部冷却面側へ中心がずれた劣弧であって、かつ、整形後のポート本体（２１）の拡径部（２３）の最大半径（ｒ２）よりも前記のずれの距離だけ半径が大きな劣弧に形成されている。しかも、対向するポート部冷却面は、上記のずれの距離の２倍だけ離間する様に設定されている。そして、シート（１ｓ）の収縮量は、厚さに換算した場合、シート（１ｓ）の厚さ（ｔ）の０．１５〜０．３５に相当する。 The port portion cooling surface is formed in a specific subarc when viewed in cross-section perpendicular to the center line of the port body in the closed state of the cooling mold. Specifically, in the cooling mold apparatus, the cooling surface of each port portion is parted by the cooling mold by a distance corresponding to the thickness obtained by subtracting the shrinkage from the initial thickness (t) of the sheet (1s). It is an inferior arc whose center is shifted to the other port portion cooling surface side with respect to the surface, and is larger than the maximum radius (r 2 ) of the enlarged diameter portion (23) of the port body (21) after shaping. It is formed in a subarc having a large radius by the distance of the deviation. In addition, the opposed port surface cooling surfaces are set so as to be separated by twice the distance of the deviation. The contraction amount of the sheet (1s) corresponds to 0.15 to 0.35 of the thickness (t) of the sheet (1s) when converted into a thickness.

すなわち、冷却用金型装置の各冷却金型は、ポート部冷却面が前述のヒートシール金型装置（８）の加熱金型（８１）のポート部加熱面（８３）と相似形状であって且つ上記の収縮量相当分だけポート部加熱面（８３）よりも小径に形成されている。そして、対向するポート部冷却面の離間距離が、前述の加熱金型（８１）のポート部加熱面（８３）の離間距離から上記の収縮量相当分の２倍の長さを差し引いた距離に設定される。上記の様に、冷却金型は、型閉した状態において、加熱金型（８１）のポート部加熱面（８３）よりも僅かに小さな冷却空間をポート部冷却面によって形成するため、ポート（２）の溶着状態を損なうことなく効率的にポート溶着部（１２ｂ）を冷却でき、製造効率を高めることが出来る。   That is, each cooling mold of the cooling mold apparatus has a port portion cooling surface similar in shape to the port heating surface (83) of the heating mold (81) of the heat seal mold apparatus (8) described above. Further, it is formed to have a smaller diameter than the port portion heating surface (83) by the amount corresponding to the contraction amount. And the separation distance of the opposing port part cooling surface is a distance obtained by subtracting twice the length corresponding to the contraction amount from the separation distance of the port part heating surface (83) of the heating mold (81). Is set. As described above, the cooling mold forms a cooling space slightly smaller than the port heating surface (83) of the heating mold (81) by the port cooling surface when the mold is closed. The port welded portion (12b) can be efficiently cooled without impairing the welded state of), and the production efficiency can be increased.

上記の様に、本発明の製造方法は、ポート（２）の溶着工程（III）において、バッグ本体（１）のポート挿入穴（１２ｃ）にポート本体（２１）を挿入して溶着する際、ポート（２）として、断面が略楕円形に整形された厚肉の拡径部（２３）をポート本体（２１）の一部に有する特定のポートを使用すると共に、半円筒状のポート部加熱面（８３）をそれぞれ有する２分割構造の加熱金型（８１）から成る特定のヒートシール金型装置（８）、すなわち、各加熱金型（８１）のポート部加熱面（８３）が特定の距離（ｄ２）だけパーティング面（Ｌ２）ずれた中心（Ｏ２）を有し且つポート本体（２１）の拡径部（２３）の最大半径（ｂ）よりもずれの距離（ｄ２）だけ大きな半径（ｒ２）の劣弧に形成され、対向するシート部加熱面（８２）が、ずれの距離（ｄ２）の２倍だけ離間する様に設定されたヒートシール金型装置を使用する。そして、加熱金型（８１）の押え付けによってポート溶着部（１２ｂ）に形成される切返し部分（Ｐ）を鈍角状に屈曲させ、これにより、切返し部分（Ｐ）における薄肉化を防止する。従って、本発明の製造方法によれば、ポート（２）の溶着後の収縮過程やプラスチックバック（１Ａ）製造後の取扱中に、切返し部分（Ｐ）におけるピンホールの発生を防止することが出来る。 As described above, in the manufacturing method of the present invention, in the welding step (III) of the port (2), when the port body (21) is inserted into the port insertion hole (12c) of the bag body (1) and welded, As the port (2), a specific port having a thick-walled enlarged portion (23) whose cross section is shaped into an approximately oval shape as a part of the port body (21) is used, and the semi-cylindrical port portion is heated. Specific heat-sealing mold apparatus (8) comprising heating molds (81) having a two-part structure each having a surface (83), that is, the port portion heating surface (83) of each heating mold (81) has a specific the distance (d 2) only parting plane (L 2) shifted center maximum radius (b) displacement distance than the enlarged diameter portion of the (O 2) and the port body having a (21) (23) (d 2 ) Is formed in a subarc with a large radius (r 2 ), and the opposed sheet parts are heated. A heat sealing mold apparatus is used in which the surface (82) is set to be separated by twice the displacement distance (d 2 ). Then, the turning portion (P) formed in the port welded portion (12b) is bent to an obtuse angle by pressing the heating mold (81), thereby preventing thinning of the turning portion (P). Therefore, according to the manufacturing method of the present invention, it is possible to prevent the occurrence of pinholes in the turned-back portion (P) during the shrinking process after welding of the port (2) and the handling after manufacturing the plastic bag (1A). .

また、上記の製造方法により得られるプラスチックバッグ（１Ａ）は、前述の様に、プラスチックシート積層体（１０）にヒートシールを施して成るバッグ本体（１）と、当該バック本体のヒートシール部、例えばトップシール部（１２）に溶着された口栓用のポート（２）とを備えており、ポート（２）は、円形パイプ状のポート本体（２１）の一部に厚肉の拡径部（２３）を有し且つポート本体（２１）の中心線に直交して断面視した場合に拡径部（２３）が２つの同一の劣弧から成る略楕円形状に整形され、かつ、ポート（２）は、拡径部（２３）の長径をヒートシール部（１２）のプラスチックシート積層体（１０）の溶着面に揃えられ且つプラスチックシート積層体（１０）の２枚のシート（１ｓ）によって拡径部（２３）を挟み込まれた状態で溶着されている。そして、ポート溶着部（１２ｂ）における各シート（１ｓ）同士の平面状に溶着された部位と各シート（１ｓ）のポート本体（２１）半周面に溶着された部位との切返し部分（Ｐ）が鈍角状に屈曲しており、切返し部分（Ｐ）のシート（１ｓ）の肉厚が十分に確保されている。従って、上記のプラスチックバッグ（１Ａ）においては、切返し部分（Ｐ）におけるピンホールの発生を防止することが出来る。   In addition, as described above, the plastic bag (1A) obtained by the above manufacturing method includes a bag body (1) obtained by heat-sealing the plastic sheet laminate (10), a heat seal portion of the back body, For example, a plug port (2) welded to the top seal portion (12) is provided, and the port (2) is a thick-diameter enlarged portion on a part of the circular pipe-shaped port body (21). (23) and, when viewed in a cross-section perpendicular to the center line of the port body (21), the enlarged-diameter portion (23) is shaped into a substantially oval shape composed of two identical subarcs, and the port ( 2) The major axis of the enlarged diameter part (23) is aligned with the welding surface of the plastic sheet laminate (10) of the heat seal part (12), and the two sheets (1s) of the plastic sheet laminate (10) Sandwich the enlarged diameter part (23) It is welded until the state. And the turning part (P) of the site | part welded in the planar shape of each sheet | seat (1s) in the port welding part (12b) and the site | part welded to the port main body (21) half peripheral surface of each sheet | seat (1s). It is bent in an obtuse angle, and the thickness of the sheet (1s) at the cut-back portion (P) is sufficiently secured. Therefore, in the plastic bag (1A), it is possible to prevent the occurrence of pinholes in the cut-back portion (P).

本発明の製造方法により得られるプラスチックバッグの一形態の全体を示す平面図である。It is a top view which shows the whole one form of the plastic bag obtained by the manufacturing method of this invention. バッグ本体にヒートシールを施すヒートシール装置の概要を示す側面図およびヒートシール金型とヒートシール部冷却金型の配置を示す正面図である。It is a side view which shows the outline | summary of the heat seal apparatus which heat-seals a bag main body, and a front view which shows arrangement | positioning of a heat seal metal mold | die and a heat seal part cooling metal mold | die. 図２のヒートシール装置に使用されるヒートシール金型およびヒートシール部冷却金型を示す加熱面および冷却面側から見た平面図である。It is the top view seen from the heating surface and cooling surface side which shows the heat-sealing metal mold | die and heat-sealing part cooling metal mold | die used for the heat-sealing apparatus of FIG. 溶着前の口栓用のポートを一部破断して示す側面図である。It is a side view which partially cuts and shows the port for plugs before welding. ポートの製造に使用されるポート構成部材を示す側面図およびポート構成部材の先端側に成形のための加熱を施す加熱炉装置を示す縦断面図である。It is a side view which shows the port structural member used for manufacture of a port, and a longitudinal cross-sectional view which shows the heating furnace apparatus which heats for a shaping | molding to the front end side of a port structural member. ポート構成部材の先端側に張出し片を形成するためのポート整形金型装置の概要を示す正面図および整形金型の構造を示す斜視図である。It is the front view which shows the outline | summary of the port shaping die apparatus for forming a protrusion piece in the front end side of a port structural member, and the perspective view which shows the structure of a shaping die. ポート整形金型装置の整形金型における半円筒状の整形面の構造を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of the semi-cylindrical shaping surface in the shaping die of a port shaping die apparatus. 本発明の製造方法により得られるプラスチックバッグのポート溶着部を示す平面図およびポート溶着部をI−I線に沿って破断した断面図である。It is the top view which shows the port weld part of the plastic bag obtained by the manufacturing method of this invention, and sectional drawing which fractured | ruptured the port weld part along the II line. ポートの溶着に使用されるポート溶着用ヒートシール金型装置を示す正面図およびヒートシール金型装置の加熱金型と補助金型の組合せ構造を示す縦断面図である。It is the front view which shows the heat-sealing die apparatus for port welding used for welding of a port, and the longitudinal cross-sectional view which shows the combined structure of the heating die of an heat-sealing die apparatus, and an auxiliary die. 図９のヒートシール金型装置のパーティング面である加熱金型の加熱面と補助金型の加温面を示す平面図である。FIG. 10 is a plan view showing a heating surface of a heating mold that is a parting surface of the heat seal mold apparatus of FIG. 9 and a heating surface of an auxiliary mold. ヒートシール金型装置の加熱金型における半円筒状のポート部加熱面の構造を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of the semi-cylindrical port part heating surface in the heating metal mold | die of a heat seal metal mold apparatus. 従来の製造方法により得られるプラスチックバッグのポート溶着部を示す平面図およびポート溶着部をXI−XI線に沿って破断した断面図である。It is the top view which shows the port weld part of the plastic bag obtained by the conventional manufacturing method, and sectional drawing which fractured | ruptured the port weld part along the XI-XI line.

符号の説明Explanation of symbols

１Ａ ：プラスチックバック
１０ ：プラスチックシート積層体
１ｓ ：プラスチックシート
１ ：バック本体
１２ ：トップシール部（ヒートシール部）
１２ｂ：ポート溶着部
１２ｃ：ポート挿入穴
１３ ：ボトムシール部（ヒートシール部）
１４ ：サイドシール部（ヒートシール部）
１５ ：ヒートシール部の内縁
２ ：ポート
２０ ：ポート構成部材
２１ ：ポート本体
２２ ：口栓装着部
２３ ：拡径部
２３ｐ：張出し片
３ ：ヒートシール装置
３２ ：シール用受金
４ ：ヒートシール金型
４ａ ：トップシール構成部
４ｂ ：ボトムシール構成部
４ｃ ：サイドシール構成部
４ｓ ：加熱面
５ ：ヒートシール部冷却金型
５ａ ：トップシール冷却部
５ｂ ：ボトムシール冷却部
５ｃ ：サイドシール冷却部
５ｓ ：冷却面
６ ：加熱炉装置
７ ：ポート整形金型装置
７０ ：金型可動機構
７ａ ：整形金型
７４ ：金型支持台
７５ ：整形面
８ ：ポート溶着用ヒートシール金型装置
８１ ：加熱金型
８２ ：シート部加熱面
８３ ：ポート部加熱面
８４ ：金型基台
８５ ：補助金型
８６ ：シート部加温面
８７ ：湾曲部加温面
ａ ：ポート本体の基端側の半径
ｂ ：整形前のポート本体（ポート構成部材）の拡径部の半径
ｄ ：ずれの距離
ｄ２ ：ずれの距離
Ｌ１ ：整形金型のパーティング面
Ｌ２ ：加熱金型のパーティング面
ｎ ：隙間
Ｐ ：切返し部分
ｒ１ ：ポート整形金型装置の整形金型の整形面（整形後のポート拡径部）の半径
ｒ２ ：ポート溶着用ヒートシール金型装置の加熱金型のポート部加熱面の半径
Ｏ ：ポートの中心
Ｏ１ ：ポート整形金型装置の整形金型の整形面の中心
Ｏ２ ：ポート溶着用ヒートシール金型装置の加熱金型のポート部加熱面の中心
ｔ ：プラスチックシートの厚さ
ｔ２ ：ポート溶着後のプラスチックシートの厚さ 1A: Plastic bag 10: Plastic sheet laminate 1s: Plastic sheet 1: Back body 12: Top seal part (heat seal part)
12b: Port welded portion 12c: Port insertion hole 13: Bottom seal portion (heat seal portion)
14: Side seal part (heat seal part)
15: Inner edge of heat seal part 2: Port 20: Port component 21: Port body 22: Port plug mounting part 23: Expanded part 23p: Overhang piece 3: Heat seal device 32: Receipt for seal 4: Heat seal gold Type 4a: Top seal component 4b: Bottom seal component 4c: Side seal component 4s: Heating surface 5: Heat seal unit cooling mold 5a: Top seal cooler 5b: Bottom seal cooler 5c: Side seal cooler 5s : Cooling surface 6: Heating furnace device 7: Port shaping mold device 70: Mold moving mechanism 7a: Shaping die 74: Mold support stand 75: Shaping surface 8: Heat sealing die device for port welding 81: Heating die Mold 82: Sheet part heating surface 83: Port part heating surface 84: Mold base 85: Auxiliary mold 86: Sheet part heating surface 87: Curved part heating surface a The radius of the base end side of the port body b: radius d of the enlarged diameter portion of the shaping before the port body (Port component): distance deviation d 2: distance deviation L 1: shaping mold parting plane L 2: heating mold parting plane n: clearance P: turning-back portion r 1: port shaping surface of the shaping mold of the shaping mold apparatus radius r of (port diameter portion of the shaped) 2: heat seal die ports welding radius O ports unit heating surface of the heating mold apparatus: central port O 1: heating mold heat sealing die device port welding: port shaping mold device center O 2 of the shaping surface of the shaping mold central port portion heating surface t: plastic sheet thickness t 2: plastic sheet thickness after ports welding

Claims (5)

プラスチックシート積層体（１０）にヒートシールを施して成るバッグ本体（１）と、当該バック本体のヒートシール部に溶着された口栓用のポート（２）とを備えたプラスチックバッグ（１Ａ）の製造方法であって、ポート（２）として、円形パイプ状のポート本体（２１）の一部に厚肉の拡径部（２３）を有し且つポート本体（２１）の中心線に直交して断面視した場合に拡径部（２３）が２つの同一の劣弧から成る略楕円形状に整形されたポートを使用すると共に、バッグ本体（１）の１つのヒートシール部（１２）に形成されたポート挿入穴（１２ｃ）にポート本体（２１）を挿入してポート溶着用ヒートシール金型装置（８）により溶着するに当たり、ポート溶着用ヒートシール金型装置（８）として、相対的に又は相互に接近離間可能な溶着用の２つの加熱金型（８１）から成る２分割構造を備え、これら加熱金型（８１）が、各々、ポート挿入穴（１２ｃ）を構成するプラスチックシート（１ｓ）のポート本体挿入部分の両側部分に当接する平坦な一対のシート部加熱面（８２）と、これらシート部加熱面（８２）の間に設けられ且つポート挿入穴（１２ｃ）を構成するプラスチックシート（１ｓ）のポート本体挿入部分に当接する半円筒状のポート部加熱面（８３）とから構成され、かつ、ポート（２）溶着の際に加熱金型（８１）を型閉した状態においてポート本体（２１）の中心線に直交して断面視した場合、各ポート部加熱面（８３）が、プラスチックシート（１ｓ）の厚さ（ｔ）の０．８〜１．１倍に相当する距離（ｄ２）だけ加熱金型（８１）のパーティング面（Ｌ２）に対して他方のポート部加熱面（８３）側へ中心（Ｏ２）がずれ且つポート本体（２１）の拡径部（２３）の半径（ｂ）よりもずれの距離（ｄ２）だけ半径（ｒ２）が大きな劣弧に形成され、対向するシート部加熱面（８２）が、ずれの距離（ｄ２）の２倍だけ離間する様に設定された金型装置を使用し、ポート本体（２１）の拡径部（２３）の長径を加熱金型（８１）のパーティングライン（Ｌ２）に揃え且つポート挿入穴（１２ｃ）を構成する２枚のプラスチックシートシート（１ｓ）によって拡径部（２３）を挟み込んだ状態でポート本体（２１）を溶着することを特徴とするプラスチックバッグの製造方法。 Of a plastic bag (1A) comprising a bag body (1) formed by heat-sealing a plastic sheet laminate (10), and a port (2) for a plug welded to a heat seal portion of the back body. In the manufacturing method, as the port (2), a part of the circular pipe-shaped port body (21) has a thick enlarged diameter portion (23) and is orthogonal to the center line of the port body (21). When viewed in cross-section, the enlarged diameter portion (23) uses a port that is shaped into a substantially oval shape consisting of two identical subarcs, and is formed on one heat seal portion (12) of the bag body (1). When the port body (21) is inserted into the port insertion hole (12c) and welded by the port welding heat seal mold device (8), the port welding heat seal mold device (8) is relatively or Close to each other A two-part structure comprising two heating molds (81) capable of welding is provided, and each of these heating molds (81) is inserted into a port body of a plastic sheet (1s) constituting a port insertion hole (12c). A pair of flat sheet portion heating surfaces (82) that abut on both sides of the portion, and a port of the plastic sheet (1s) provided between the sheet portion heating surfaces (82) and constituting the port insertion hole (12c) It is composed of a semi-cylindrical port portion heating surface (83) that comes into contact with the body insertion portion, and the port die (81) is closed when the port (2) is welded. When viewed in cross-section perpendicular to the center line, each port portion heating surface (83) has a distance (d 2 ) corresponding to 0.8 to 1.1 times the thickness (t) of the plastic sheet (1s). Part of heating mold (81) The center (O 2 ) is shifted toward the other port heating surface (83) side with respect to the wing surface (L 2 ), and the distance is larger than the radius (b) of the enlarged diameter portion (23) of the port body (21). A mold apparatus in which the radius (r 2 ) is formed in a subarc having a large radius (d 2 ), and the opposed sheet heating surfaces (82) are set apart by twice the displacement distance (d 2 ). , Two plastic sheets constituting the port insertion hole (12c) with the long diameter of the enlarged diameter portion (23) of the port body (21) aligned with the parting line (L 2 ) of the heating mold (81) A method for manufacturing a plastic bag, comprising: welding a port body (21) in a state in which the enlarged diameter portion (23) is sandwiched between sheets (1s). ポート（２）として、ポート本体（２１）の拡径部（２３）の外周面に対して当該拡径部の長径方向に一対の薄肉の張出し片（２３ｐ）を張り出して構成されたポートを使用し、２枚のプラスチックシートシート（１ｓ）によって拡径部（２３）と共に各張出し片（２３ｐ）を挟み込んだ状態でポート本体（２１）を溶着する請求項１に記載のプラスチックバッグの製造方法。   As the port (2), a port configured by projecting a pair of thin projecting pieces (23p) in the major axis direction of the enlarged diameter portion with respect to the outer peripheral surface of the enlarged diameter portion (23) of the port body (21) is used. The method for manufacturing a plastic bag according to claim 1, wherein the port body (21) is welded in a state where each projecting piece (23p) is sandwiched with the enlarged diameter portion (23) by two plastic sheet sheets (1s). 略円形パイプ状のポート本体（２１）と口栓装着部（２２）とを有し且つポート本体（２１）の先端側に厚肉の円筒状断面の拡径部（２３）が設けられたポート構成部材（２０）を射出成形し、ポート構成部材（２０）の拡径部（２３）をポート整形金型装置（７）によって略楕円形断面に加熱整形することによりポート（２）を製造するに当たり、ポート整形金型装置（７）として、相対的に又は相互に接近離間可能な２つの整形金型（７ａ）から成る２分割構造を備え、これら整形金型（７ａ）が、各々、半円筒状の整形面（７５）を有し、拡径部（２３）整形の際に整形金型（７ａ）を型閉した状態においてポート本体（２１）の中心線に直交して断面視した場合、各整形面（７５）が、拡径部（２３）の直径とポート本体（２１）の基端側の直径との差の範囲内に相当する距離（ｄ）だけ整形金型（７ａ）のパーティング面（Ｌ１）に対して他方の整形面（７５）側へ中心（Ｏ１）がずれ且つポート本体（２１）の拡径部（２３）の半径（ｂ）よりもずれの距離（ｄ）だけ半径（ｒ１）が大きな劣弧に形成された金型装置を使用する請求項１又は２に記載のプラスチックバッグの製造方法。 A port having a substantially circular pipe-shaped port body (21) and a plug mounting portion (22), and having a thick cylindrical expanded diameter portion (23) provided on the distal end side of the port body (21). The component (20) is injection-molded, and the port (2) is manufactured by heat-shaping the enlarged diameter portion (23) of the port component (20) into a substantially oval cross section by the port shaping mold device (7). In this case, the port shaping mold device (7) has a two-part structure composed of two shaping molds (7a) that can be moved relative to each other or separated from each other. When it has a cylindrical shaping surface (75) and is viewed in cross-section perpendicular to the center line of the port body (21) when the shaping mold (7a) is closed during shaping of the enlarged diameter portion (23) Each shaping surface (75) has a diameter of the enlarged diameter portion (23) and the port body (21). A distance corresponding to the range of the difference between the end-side diameter (d) only shaping mold parting plane of (7a) (L 1) other shaping surface relative (75) center to the side (O 1) is A mold apparatus is used in which a radius (r 1 ) is formed in an inferior arc with a larger distance (d) than the radius (b) of the shifted and enlarged diameter portion (23) of the port body (21). Or the manufacturing method of the plastic bag of 2. ポート構成部材（２０）を加熱整形するに当たり、予め、加熱炉装置（６）を使用し、ポート構成部材（２０）のポート本体（２１）の拡径部（２３）に加熱処理を施す請求項３に記載のプラスチックバッグの製造方法。   When heating and shaping the port component (20), a heating furnace device (6) is used in advance to heat-treat the diameter-enlarged portion (23) of the port body (21) of the port component (20). 4. A method for producing a plastic bag according to 3. 請求項１〜４の何れかに記載の製造方法により製造されたプラスチックバッグ（１Ａ）であって、プラスチックシート積層体（１０）にヒートシールを施して成るバッグ本体（１）と、当該バック本体のヒートシール部（１２）に溶着された口栓用のポート（２）とを備え、ポート（２）は、円形パイプ状のポート本体（２１）の一部に厚肉の拡径部（２３）を有し且つポート本体（２１）の中心線に直交して断面視した場合に拡径部（２３）の外形が２つの同一の劣弧から成る略楕円形状に整形され、かつ、ポート（２）は、ポート本体（２１）の拡径部（２３）の長径をヒートシール部（１２）のプラスチックシート積層体（１０）の溶着面に揃えられ且つプラスチックシート積層体（１０）の２枚のプラスチックシート（１ｓ）によって拡径部（２３）を挟み込まれた状態で溶着されていることにより、ポート溶着部における各プラスチックシート（１ｓ）同士の平面状に溶着された部位と各プラスチックシート（１ｓ）のポート本体半周面に溶着された部位との切返し部分（Ｐ）が鈍角状に屈曲していることを特徴とするプラスチックバッグ。   A plastic bag (1A) manufactured by the manufacturing method according to any one of claims 1 to 4, wherein the bag main body (1) is formed by heat-sealing a plastic sheet laminate (10), and the back main body. A plug port (2) welded to the heat seal portion (12), and the port (2) has a thick-diameter enlarged portion (23 ) And the outer diameter of the enlarged-diameter portion (23) when viewed in a cross-section perpendicular to the center line of the port body (21) is shaped into a substantially elliptical shape composed of two identical subarcs, and the port ( 2) The long diameter of the enlarged diameter portion (23) of the port body (21) is aligned with the welding surface of the plastic sheet laminate (10) of the heat seal portion (12), and two sheets of the plastic sheet laminate (10) are provided. By the plastic sheet (1s) By welding in a state where the expanded diameter portion (23) is sandwiched, a portion where the plastic sheets (1s) in the port welded portion are welded to each other in a planar shape and a half surface of the port body of each plastic sheet (1s) A plastic bag, characterized in that a cut-back portion (P) with a portion welded to the substrate is bent at an obtuse angle.
JP2006130198A 2006-05-09 2006-05-09 Plastic bag and its manufacturing method Withdrawn JP2007301751A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009285862A (en) * 2008-05-27 2009-12-10 Morinaga & Co Ltd Method for manufacturing gusseted pouch container
JP2009286481A (en) * 2008-06-01 2009-12-10 Fuji Seal International Inc Manufacturing method for pouch container having spout, and pouch which is suitable for this manufacturing method
JP2021132832A (en) * 2020-02-26 2021-09-13 株式会社群馬コイケ liner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009285862A (en) * 2008-05-27 2009-12-10 Morinaga & Co Ltd Method for manufacturing gusseted pouch container
JP2009286481A (en) * 2008-06-01 2009-12-10 Fuji Seal International Inc Manufacturing method for pouch container having spout, and pouch which is suitable for this manufacturing method
JP2021132832A (en) * 2020-02-26 2021-09-13 株式会社群馬コイケ liner

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