JP2007000452A - Plastic bag and its manufacturing method - Google Patents

Plastic bag and its manufacturing method Download PDF

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Publication number
JP2007000452A
JP2007000452A JP2005185464A JP2005185464A JP2007000452A JP 2007000452 A JP2007000452 A JP 2007000452A JP 2005185464 A JP2005185464 A JP 2005185464A JP 2005185464 A JP2005185464 A JP 2005185464A JP 2007000452 A JP2007000452 A JP 2007000452A
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JP
Japan
Prior art keywords
port
heat seal
mold
heat
plastic bag
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.)
Pending
Application number
JP2005185464A
Other languages
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 JP2005185464A priority Critical patent/JP2007000452A/en
Publication of JP2007000452A publication Critical patent/JP2007000452A/en
Pending 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
    • 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
    • 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
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • 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
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/133—Fin-type joints, the parts to be joined being flexible
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • 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
    • B29C66/50—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
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • 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
    • B29C66/70—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
    • 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
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic bag having a structure surely preventing the formation of a pinhole in a port welding part in the plastic bag formed by heat-sealing a plastic sheet laminated body and welding a port for a plug in the heat seal part and to provide its manufacturing method. <P>SOLUTION: This plastic bag 1A is provided with a bag body 1 and the port 2 welded to the heat seal part. The port 2 is constituted by overhanging a pair of thin-wall overhang pieces in the outer circumferential face of a circular pipe-shaped port body and each overhang piece is welded with its clamped between two sheets of the heat seal part. This manufacturing method of the plastic bag 1A is characterized in that, after the bag body 1 is manufactured by heat-sealing the plastic laminated body, the port body of the port 2 is inserted into a port insertion hole of the heat seal part and welded with each overhang piece clamped between the two sheets. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、プラスチックバッグ及びそ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、および、当該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 plastic bag and a method for manufacturing the same, 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 in a heat-sealing part. The present invention relates to a plastic bag in which a port for a stopper is welded, and a method for manufacturing the plastic bag.

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１０は、従来のプラスチックバッグにおけるポート溶着部を示す平面図およびポート本体に直交する断面図である。上記のプラスチックバッグの製造においては、図１０（ａ）に示す様に、トップシール部（１２）にポート挿入穴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前記ポート挿入穴に挿入して溶着する。なお、ポート（２Ｂ）の溶着においては、図１０（ｂ）に示す様に、半円弧状のポート部支持穴が加熱面に設けられた分割型のポート溶着用ヒートシール金型（８Ｂ）をトップシール部（１２）の両面から押し付け、ポート挿入穴を形成している２枚のシート（１ｓ）をポート本体の外周に溶着する。   FIG. 10 is a plan view showing a port weld portion in a conventional plastic bag and a cross-sectional view orthogonal to the port body. In manufacturing the plastic bag, as shown in FIG. 10A, after the back body (1) having the port insertion hole formed in the top seal portion (12) is manufactured by heat sealing, the port (2B) A circular pipe-shaped port body is inserted into the port insertion hole and welded. In welding the port (2B), as shown in FIG. 10 (b), a split-type port welding heat seal mold (8B) in which a semicircular port support hole is provided on the heating surface is used. The two sheets (1s) forming the port insertion holes are welded to the outer periphery of the port body by pressing from both sides of the top seal portion (12).

ところで、従来のプラスチックバッグは、図１０（ｂ）に示す様に、トップシール部（１２）にポート（２Ｂ）を溶着した際、ポート溶着用ヒートシール金型（８Ｂ）のポート部支持穴のエッジ部による押え付けにより、トップシール部（１２）の拡がり方向に溶着された平面状の部位に対し、各シート（１ｓ）のポート本体半周面に溶着された部位が略直角に折り曲げられた状態に屈曲し且つ薄肉化するため、各シート（１ｓ）の突合せ部分とポート本体の外周面との界面においてポート本体の長手方向に沿ったピンホール（Ｐ）が発生し易いと言う問題がある。図１０（ｂ）はピンホールの発生部位を示しており、図１０（ａ）はピンホールの方向を示している。   By the way, as shown in FIG. 10 (b), when the port (2B) is welded to the top seal portion (12), the conventional plastic bag has the port portion support hole of the heat welding mold (8B) for port welding. The part welded to the half circumference of the port body of each sheet (1s) is bent at a substantially right angle with respect to the flat part welded in the spreading direction of the top seal part (12) by pressing by the edge part. Therefore, there is a problem that a pinhole (P) along the longitudinal direction of the port body is likely to occur at the interface between the butted portion of each sheet (1s) and the outer peripheral surface of the port body. FIG. 10B shows a pinhole generation site, and FIG. 10A shows the direction of the pinhole.

本発明は、上記の実情に鑑み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改良された構造のプラスチックバッグ、および、当該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 of the present invention is to provide a plastic bag that is formed by heat-sealing a plastic sheet laminate such as an inflation tube, and a port for a plug is welded to the heat-sealed portion. Then, it is providing the plastic bag of the improved structure which can prevent reliably generation | occurrence | production of the pinhole in a port welding part, and the manufacturing method of the said plastic bag.

上記の課題を解決するため、本発明では、バック本体のトップシール部にポートを溶着するに当たり、円形パイプ状のポート本体の外周面に一対の薄肉の張出し片が張出された特定のポートを使用し、ポート本体の外周面を囲むプラスチックシート積層体の各シートの突合せ部分に前記の張出し片を介在させて溶着することにより、前記の突合せ部分における各シートの屈曲部分の曲率を大きくし且つヒートシール金型で押え付けた際の薄肉化を防止し、前記の突合せ部分とポート本体の外周面との界面において溶着強度の高い一体化構造を構成する様にした。   In order to solve the above-mentioned problems, in the present invention, when welding a port to the top seal portion of the back body, a specific port in which a pair of thin projecting pieces are projected on the outer peripheral surface of the circular pipe-shaped port body is provided. And increasing the curvature of the bent portion of each sheet in the butt portion by welding the butt piece on the butt portion of each sheet of the plastic sheet laminate surrounding the outer peripheral surface of the port body. Thinning when pressed with a heat seal mold is prevented, and an integrated structure with high welding strength is formed at the interface between the butt portion and the outer peripheral surface of the port body.

すなわち、本発明の第１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であって、前記ポートは、円形パイプ状のポート本体の外周面に対して当該ポート本体の中心線周りに対称な位置に一対の薄肉の張出し片を張り出して構成され、そして、前記ポートは、前記ヒートシール部に形成されたポート挿入穴に前記ポート本体を挿入され、かつ、プラスチックシート積層体の２枚のシートによって前記各張出し片を挟み込まれた状態で溶着されていることを特徴とするプラスチックバッグに存する。   That is, the first gist of the present invention is a plastic bag including 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. The port is configured by projecting a pair of thin projecting pieces in a symmetrical position around the center line of the port body with respect to the outer peripheral surface of the circular pipe-shaped port body, and the port includes the heat A plastic bag characterized in that the port main body is inserted into a port insertion hole formed in a seal portion, and is welded in a state where each projecting piece is sandwiched between two sheets of a plastic sheet laminate. Exist.

また、本発明の第２の要旨は、請求項１に記載のプラスチックバッグの製造方法であって、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、ヒートシール部にポート挿入穴が形成されたバッグ本体を製造した後、前記ポートとして、円形パイプ状のポート本体の外周面に対して当該ポート本体の中心線周りに対称な位置に一対の薄肉の張出し片を張り出して構成されたポートを使用し、前記バッグ本体のヒートシール部のポート挿入穴に前記ポート本体を挿入し、プラスチックシート積層体の２枚のシートによって前記各張出し片を挟み込んだ状態において、前記ヒートシール部に前記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。   According to a second aspect of the present invention, there is provided a method for manufacturing a plastic bag according to claim 1, wherein the plastic sheet laminate is heat sealed to form a port insertion hole in the heat seal portion. After manufacturing the main body, a port configured by projecting a pair of thin projecting pieces in a symmetrical position around the center line of the port main body with respect to the outer peripheral surface of the circular pipe-shaped port main body is used as the port. The port main body is inserted into the port insertion hole of the heat seal portion of the bag main body, and the port main body is welded to the heat seal portion in a state where the protruding pieces are sandwiched between two sheets of the plastic sheet laminate. It exists in the manufacturing method of the plastic bag characterized by doing.

本発明に係るプラスチックバッグによれば、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され、かつ、プラスチックシート積層体の２枚のシートによってポート本体の各張出し片を挟み込まれた状態でポートが溶着されており、ポート本体の外周面を囲む各シートの突合せ部分とポート本体の外周面との界面において溶着強度の高い一体化構造を構成しているため、ポート溶着部におけるピンホールの発生を確実に防止することが出来る。   According to the plastic bag of the present invention, the port body is inserted into the port insertion hole formed in the heat seal portion, and each overhanging piece of the port body is sandwiched between the two sheets of the plastic sheet laminate. Since the port is welded, and an integrated structure with high welding strength is formed at the interface between the butted portion of each sheet surrounding the outer peripheral surface of the port main body and the outer peripheral surface of the port main body, a pinhole in the port welded portion Can be reliably prevented.

また、本発明に係るプラスチックバッグの製造方法によれば、ヒートシール部のポート挿入穴にポート本体を挿入し、プラスチックシート積層体の２枚のシートによってポート本体の各張出し片を挟み込んだ状態においてポート本体を溶着することにより、ポート本体の外周面を囲む各シートの突合せ部分とポート本体の外周面との界面において溶着強度の高い一体化構造を構成するため、ポート溶着部においてピンホールが発生することのないプラスチックバッグを得ることが出来る。   Further, according to the plastic bag manufacturing method of the present invention, in the state where the port body is inserted into the port insertion hole of the heat seal portion, and each overhanging piece of the port body is sandwiched between the two sheets of the plastic sheet laminate. By welding the port body, an integrated structure with high welding strength is formed at the interface between the butt portion of each sheet surrounding the outer peripheral surface of the port body and the outer peripheral surface of the port body, so a pinhole is generated at the port welded portion. You can get a plastic bag that doesn't.

本発明に係るプラスチックバッグ及びそ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〜図３は本発明に係るプラスチックバッグの一形態を示す図であり、各々、図１はプラスチックバッグの平面図、図２はポートの形状を一部破断して示す側面図、図３はポート溶着部の構造をポート本体に直交する方向に破断して示す断面図である。また、図４〜図９は本発明に係るプラスチックバッグの製造方法に適用される装置および部材の一形態を示す図であり、各々、図４は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、図５は図４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、図６は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加熱加工を施す加熱炉装置を示す縦断面図、図７は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、図８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加熱面の形状を示す側面図、図９はポートの溶着に使用されるポート溶着部冷却金型装置を示す正面図および冷却面の形状を示す側面図である。   An embodiment of a plastic bag and a method for producing the same according to the present invention will be described with reference to the drawings. 1 to 3 are views showing one embodiment of a plastic bag according to the present invention, in which FIG. 1 is a plan view of the plastic bag, FIG. 2 is a side view showing a partly broken shape of the port, and FIG. FIG. 5 is a cross-sectional view showing the structure of the port welded portion in a direction perpendicular to the port body. 4 to 9 are views showing one embodiment of an apparatus and members applied to the plastic bag manufacturing method according to the present invention, and FIG. 4 is an outline of a heat seal apparatus for heat-sealing the bag body. FIG. 5 is a side view showing the heat sealing mold and the front view showing the arrangement of the heat sealing mold and the heat sealing part cooling mold, FIG. 5 is the heating showing the heat sealing mold and the heat sealing part cooling mold used in the heat sealing apparatus of FIG. FIG. 6 is a side view showing a port constituent member used for manufacturing a port, and a longitudinal cross-sectional view showing a heating furnace apparatus for performing heat processing on the distal end side of the port constituent member. 7 is a front view showing an outline of a port shaping mold apparatus for forming a projecting piece on the distal end side of a port component and a perspective view showing a structure of the shaping mold, and FIG. 8 is a port welding used for welding of ports. FIG. 9 is a front view showing a heat sealing mold apparatus and a side view showing the shape of a heating surface, and FIG. 9 is a front view showing a port welded part cooling mold apparatus used for welding ports and a side view showing the shape of a cooling surface. is there.

先ず、本発明のプラスチックバックについて説明する。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、図１に示す様に、プラスチックシート積層体（１０）（図４及び図５参照）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 of the present invention will be described. The plastic bag 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. As shown in FIG. 1, the plastic bag (1A) includes a back body (1) formed by heat-sealing a plastic sheet laminate (10) (see FIGS. 4 and 5), and a heat of the back body. It has a port (2) for a stopper plug welded to a seal portion, usually a 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 by 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））を構成するシート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 sheet constituting the back body (1) (plastic sheet laminate (10)) includes a film, and the thickness of one sheet is usually from the viewpoint of strength, workability, cost, and the like. 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形成され、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２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、概略、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 formed by injection molding and heat shaping as will be described later, and as the constituent material, the same resin as described 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. And a port body (21) welded to, for example, a top seal portion (12) of the back body (1), and a stopper welding system (the system illustrated in the figure) provided at one end of the port body and a screw lid system. And a plug mounting portion (22) configured so that a plug member such as can be attached. The size of the port body (21) of the port (2) is roughly about 25 to 50 mm in length, about 8 to 20 mm in outer diameter, and about 1.0 to 2.5 mm in wall thickness.

本発明においては、バック本体（１）のトップシール部（１２）においてポート（２）のポート本体（２１）を囲むプラスチックシート積層体（１０）の各シート（１ｓ）の突合せ部分とポート本体（２１）の外周面との界面を完全に一体化し且つその溶着強度を高めるため、特定の形状のポート（２）が使用される。   In the present invention, the butted portion of each sheet (1s) of the plastic sheet laminate (10) surrounding the port body (21) of the port (2) in the top seal portion (12) of the back body (1) and the port body ( In order to completely integrate the interface with the outer peripheral surface of 21) and increase its welding strength, a port (2) having a specific shape is used.

すなわち、ポート（２）は、図２及び図３に示す様に、円形パイプ状のポート本体（２１）の外周面に対して当該ポート本体の中心線周りに対称な位置に一対の薄肉の張出し片（２３）を張り出して構成される。そして、図３に示す様に、ポート（２）は、バック本体（１）のトップシール部（１２）にヒートシール時に形成されたポート挿入穴にポート本体（２１）を挿入され、かつ、プラスチックシート積層体（１０）の２枚のシート（１ｓ）によって各張出し片（２３）を挟み込まれた状態で溶着される。これにより、トップシール部（１２）のポート溶着部におけるピンホールの発生を防止することが出来る。   That is, as shown in FIGS. 2 and 3, the port (2) has a pair of thin overhangs at positions symmetrical about the center line of the port body with respect to the outer peripheral surface of the circular pipe-shaped port body (21). A piece (23) is formed by overhanging. As shown in FIG. 3, the port (2) has a port body (21) inserted into a port insertion hole formed at the time of heat sealing in the top seal portion (12) of the back body (1), and is made of plastic. The sheet laminate (10) is welded in a state where each projecting piece (23) is sandwiched between two sheets (1s) of the sheet laminate (10). Thereby, generation | occurrence | production of the pinhole in the port welding part of a top seal part (12) can be prevented.

ポート（２）のポート本体（２１）の構造としては、図２（ａ）〜（ｃ）に示す様な構造が挙げられる。図２（ａ）に示すポート（２）は、ポート本体（２１）の先端部の外周面に対し、当該ポート本体の中心線に沿って細長に形成された羽根状の張出し片（２３）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。図２（ｂ）に示すポート（２）は、ポート本体（２１）の先端部の外周面に当該ポート本体の基部よりも大径の台座部を設け、当該台座部の外周面に対し、図２（ａ）と同様の羽根状の張出し片（２３）を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２（ｃ）に示すポート（２）は、ポート本体（２１）の先端部の外周面に対し、リング状凹凸部（２４）を形成し、かつ、図２（ａ）と同様の羽根状の張出し片（２３）を一対配置した構造を備えている。   Examples of the structure of the port body (21) of the port (2) include structures as shown in FIGS. The port (2) shown in FIG. 2 (a) has a blade-like projecting piece (23) formed in an elongated shape along the center line of the port body with respect to the outer peripheral surface of the tip of the port body (21). A pair of structures are provided at symmetrical positions around the center line. The port (2) shown in FIG. 2 (b) is provided with a pedestal portion having a diameter larger than that of the base portion of the port body on the outer peripheral surface of the port body (21). A structure in which a pair of blade-like projecting pieces (23) similar to 2 (a) are arranged symmetrically around the center line is provided. Further, the port (2) shown in FIG. 2 (c) has a ring-shaped uneven portion (24) formed on the outer peripheral surface of the distal end portion of the port body (21), and is similar to FIG. 2 (a). It has a structure in which a pair of blade-like projecting pieces (23) are arranged.

また、本発明においては、図３に示す様に、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）の突合せ部分の溶着強度を高めるため、溶着前のポート（２）における各張出し片（２３）の張出し方向に沿った厚さ部分の断面形状は、尖鋭な略三角形状の形成されているのが好ましい。しかも、本発明の好ましい態様において、ポート（２）における各張出し片（２３）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（２３）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）のポート挿入穴の長さの０．６〜０．９５倍に設定される。   Further, in the present invention, as shown in FIG. 3, when the port (2) is welded to the top seal portion (12), the butt portion of each sheet (1s) surrounding the outer peripheral surface of the port body (21) is welded. In order to increase the strength, it is preferable that the cross-sectional shape of the thickness portion along the projecting direction of each projecting piece (23) in the port (2) before welding is a sharp, substantially triangular shape. Moreover, in a preferred embodiment of the present invention, the overhang length from the outer peripheral surface of the port body (21) of each overhang piece (23) in the port (2) is set to 2 to 10 times the thickness of the sheet (1s). The And the length along the center line of the port main body (21) of each overhanging piece (23) in the port (2) is 0 of the length of the port insertion hole of the top seal portion (12) of the back main body (1). .6 to 0.95 times.

上記の様に、本発明のプラスチックバック（１Ａ）は、トップシール部（１２）に形成されたポート挿入穴にポート本体（２１）を挿入され、かつ、プラスチックシート積層体（１０）の２枚のシート（１ｓ）によってポート本体（２１）の各張出し片（２３）を挟み込まれた状態でポート（２）が溶着されている。換言すれば、トップシール部（１２）のポート溶着部においては、ポート本体（２１）の外周面を囲む各シート（１ｓ）の突合せ部分に張出し片（２３）を介在させ、突合せ部分において各シート（１ｓ）の屈曲部分を鈍角の曲面に形成して張出し片（２３）と一体化させているため、ポート溶着用ヒートシール金型装置（８）で押え付けた際の各シート（１ｓ）の屈曲部分の薄肉化を防止でき、突合せ部分とポート本体（２１）の外周面との界面において溶着強度の高い一体化構造を構成できる。その結果、本発明のプラスチックバック（１Ａ）は、トップシール部（１２）のポート溶着部におけるピンホールの発生を確実に防止することが出来る。   As described above, in the plastic bag (1A) of the present invention, the port body (21) is inserted into the port insertion hole formed in the top seal portion (12), and two sheets of the plastic sheet laminate (10) are provided. The port (2) is welded in a state where the projecting pieces (23) of the port body (21) are sandwiched by the sheet (1s). In other words, in the port weld portion of the top seal portion (12), the projecting piece (23) is interposed at the butting portion of each sheet (1s) surrounding the outer peripheral surface of the port body (21), and each sheet is located at the butting portion. Since the bent portion of (1s) is formed into an obtuse curved surface and integrated with the overhanging piece (23), the sheet (1s) of each sheet (1s) when pressed by the heat-sealing mold device (8) for port welding is used. Thinning of the bent portion can be prevented, and an integrated structure with high welding strength can be configured at the interface between the butted portion and the outer peripheral surface of the port body (21). As a result, the plastic bag (1A) of the present invention can reliably prevent the occurrence of pin holes in the port welded portion of the top seal portion (12).

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４及び図５参照）、ヒートシール部（例えばトップシール部（１２））にポート挿入穴が形成されたバック本体（１）を製造した後（図１参照）、前述の特定構造のポート（２）を使用し（図２参照）、バック本体（１）のトップシール部（１２）のポート挿入穴にポート本体（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（２）の各張出し片（２３）を挟み込んだ状態において、前記のヒートシール部にポート本体（２１）を溶着する（図３参照）。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. 4 and 5), and the port is inserted into the heat-sealed portion (for example, the top seal portion (12)). After manufacturing the back body (1) in which the hole is formed (see FIG. 1), the port (2) having the specific structure described above is used (see FIG. 2), and the top seal portion (12) of the back body (1) is used. In the state where the port body (21) is inserted into the port insertion hole of the plastic sheet laminate and each projecting piece (23) of the port (2) is sandwiched between the two sheets (1s) of the plastic sheet laminate (10), The port body (21) is welded to the seal portion (see FIG. 3). 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４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、２枚の独立シートを重ね合わせた積層体が使用されるが、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 in which two independent sheets are stacked is used. When an inflation tube is used, the back body is formed by applying a two-way seal. (1) can be manufactured, and when using the laminated body which consists of two sheets, a back body (1) can be manufactured by giving a four-way seal.

ヒートシール装置としては、通常、ロータリー方式のヒートシール装置又は図４に示す様なライン方式のヒートシール装置（３）が使用される。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５参照）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。また、ローターの外周側には、印刷機構やポート溶着機構が設けられる。   As the heat seal device, a rotary heat seal device or a line heat seal device (3) as shown in FIG. 4 is usually used. The rotary heat seal device generally has a plastic sheet laminated with a material equivalent to one plastic bag (1A) on the surface of a seal receiving plate as a base arranged in large numbers at regular intervals on the outer peripheral surface of the rotor. While sequentially supplying the body (10) and rotating the rotor in one direction, the heat seal mold (4) and the heat seal portion cooling mold (5) (see FIG. 5) disposed on the outer peripheral side of the rotor. By sequentially pressing, heat sealing is performed. A printing mechanism and a port welding mechanism are provided on the outer peripheral side of the rotor.

ライン方式のヒートシール装置（３）は、図４（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４（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（７）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. 4A, 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 fabric roll. In general, a plurality of units are arranged linearly. The apparatus illustrated in FIG. 4 (a) is an apparatus having a vertical structure, and each heat sealing apparatus (1A) includes an apparatus mount (31) having a seal receiver (32) disposed on the upper surface, and the sealing apparatus. 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 capable of moving forward and backward, and a heat seal mold (4) for the plastic sheet laminate (7) 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４（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. 4 (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.

また、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４（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。   In addition, 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 equipped with a heating device and a cooling device by a pipe, so that the cooling water is supplied to the inside. It is configured to be recyclable. And as shown in FIG.4 (b), the heat seal part cooling metal mold | die (5) is faced downward at the metal mold | die base (36) at the front-end | tip of drive mechanisms (34), such as a cylinder apparatus arrange | positioned horizontally. 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５（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. 5C, 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５（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５（ｂ）に示す様な平面形状のものが挙げられる。   As the heat seal mold (4) incorporated in the rotary type or line type heat seal device (3) as described above, a flat shape as shown in FIG. Or the thing of planar shape as shown in FIG.5 (b) for giving a four-way seal | sticker is mentioned.

図５（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を形成するため、ポート挿入穴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. 5 (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 is omitted in order to form a port insertion hole for mounting the port (2), and the planar shape of each divided portion Is formed in a substantially L-shape. In addition, the bottom seal component (4b) is formed in a substantially flat concave shape in plan view.

一方、図５（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５（ｂ）に示すヒートシール金型（４）は、上記の図５（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. 5 (b) has a top seal component (4a) and a bottom protruding from the surface of the mold base (35) and 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. 5 (b) is divided into a top seal component (4a) and a bottom seal component (4b) having the same divided structure as the mold shown in FIG. 5 (a). Are connected by two side seal components (4c).

なお、図５（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. 5 (a) and 5 (b), in order to increase the bag breaking strength at the shoulder opening of the back body (1), the rising portion of the port insertion hole, and both corners of the bottom side, The entrance corners and the exit corners of the top seal component (4a) and the bottom seal component (4b) corresponding to the shoulder part, 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５（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５（ｂ）に示す様な平面形状のものが使用される。図５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 portion cooling mold (5), when a two-way seal is applied, a flat shape as shown in FIG. 5 (a) is used. A plane shape as shown is used. Reference numerals in parentheses in FIG. 5 indicate the cooling mold and its components.

図５（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５（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 part cooling mold (5) for two-way sealing shown in FIG. 5 (a) has a top seal cooling part (5a) and a bottom seal cooling part 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. 5 (b) is a top seal that projects from the surface of the mold base (36) and is 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ている必要がある。   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. Further, the cooling surface (5s) of the heat seal portion cooling mold (5) needs to be 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：
バック本体（１）の製造工程とは別途に、図２に示す様な前述のポート（２）を準備する。ポート（２）は、射出成形された図６（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６（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（２３ｐ）に形成されている。ポート本体（２１）は、拡径部（２３ｐ）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:
Separately from the manufacturing process of the back body (1), the aforementioned port (2) as shown in FIG. 2 is prepared. The port (2) is manufactured by heat-shaping a port component (20) as shown in FIG. The port component (20) shown in FIG. 6 (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 front end side of the port body (21) is formed into a thickened enlarged diameter portion (23p). The port body (21) is formed in a circular pipe shape except for the enlarged diameter portion (23p). 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（２３）をポート（２）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）に対し、拡径部（２３ｐ）の最大外径（ｄ１）が１．０１〜１．０５倍、ポート本体（２１）の中心線に沿った拡径部（２３ｐ）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、拡径部（２３ｐ）の最大外径（ｄ１）は８．３〜２１ｍｍ程度、拡径部（２３ｐ）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。 Port component (20), in order to form a port (2) projecting pieces (23) to function effectively, with respect to the port body (21) diameter are not even outer diameter of the base end side of the (d 0) The maximum outer diameter (d 1 ) of the enlarged diameter portion (23p) is 1.01 to 1.05 times, and the length (l 1 ) of the enlarged diameter portion (23p) along the center line of the port body (21) is The outer diameter (d 2 ) of the tip of the port body (21) is set to 0.60 to 2.5 times and 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, and the maximum outer diameter (d 1 ) of the enlarged diameter portion (23p) is about 8.3 to 21 mm. The length (l 1 ) of the diameter portion (23p) is about 10 to 25 mm, the outer diameter (d 2 ) of the distal end is about 7.2 to 18 mm, and the wall thickness on the proximal end side of the port body (21) is 1 It is about 0.0-2.5 mm.

本発明においては、ポート構成部材（２０）の拡径部（２３ｐ）の大きさを上記の様に設定することにより、ポート（２）のポート本体（２１）に前述した適切な大きさの張出し片（２３）を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）を打擲した際、ポート本体（２１）の外周面を囲む各シート（１ｓ）の突合せ部分と張出し片（２３）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（２３ｐ）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 diameter-enlarged portion (23p) of the port component (20) as described above, the above-described appropriate extension of the port body (21) of the port (2) is provided. A piece (23) can be formed, so that when the port (2) is driven into the top seal portion (12), the butted portion and overhang of each sheet (1s) surrounding the outer peripheral surface of the port body (21) The piece (23) can be more completely integrated. And since said port structural member (20) is only formed in the enlarged diameter part (23p) 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（２３ｐ）を整形金型（７ａ）（図７参照）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、加熱炉装置（６）を使用し、予めポート本体（２１）の拡径部（２３ｐ）に加熱処理を施し、拡径部（２３ｐ）を半溶融状態にする。   The port (2) is manufactured by heat-shaping the enlarged diameter portion (23p) on the distal end side of the injection-molded port component (20) with a shaping die (7a) (see FIG. 7). In the heat shaping of the port component (20), in order to increase the molding accuracy and molding efficiency, the heating furnace device (6) is used, and the diameter-enlarged portion (23p) of the port body (21) is preliminarily heated. The expanded diameter portion (23p) is brought into a semi-molten state.

加熱炉装置（６）は、図６（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（２３ｐ）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（２３ｐ）の長さ（ｌ１）の０．９〜１．３倍に設定され、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（２３ｐ）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. 6B, 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 expanded diameter part (23p), 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 (23p), and the inner peripheral surface of the casing is coated with a coating film for generating far infrared rays. And the cylinder of a heating furnace apparatus (6) considers the cycle of a welding process, and the temperature of an enlarged diameter part (23p) is about -20- + 50 degreeC with respect to melting | fusing point of the constituent resin of a port structural 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７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）に張出し片（２３）を成形する。ポート整形金型装置（７）は、図７（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 the above-mentioned preheating treatment is performed on the port component (20), a projecting piece (23) is formed on the port body (21) using a port shaping mold device (7) as shown in FIG. . As shown in FIG. 7A, the port shaping mold apparatus (7) includes, 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。上記の整形金型（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 above-mentioned shaping mold (7a) is disposed on one side of a rectangular parallelepiped block-shaped mold support (74), for example, and two other shaping parts are arranged on the other side of the mold support (74) facing each other. In order to clamp the mold (7a) accurately, a guide pin and a guide bush which are engaged with each other are provided.

整形金型（７ａ）の内部には、整形面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。そして、整形金型（７ａ）の整形面は、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。   An electric heater is provided inside the shaping die (7a) in order to keep the temperature of the shaping surface constant. The shaping surface of the shaping mold (7a) is usually controlled at 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. Has been made.

各整形金型（７ａ）のパーティング面である成形面は、図７（ｂ）に示す様に、ポート（２）のポート本体（２１）の先端側（図２参照）を当該ポート本体の中心線および両方の張出し片（２３）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、整形金型（７ａ）の成形面は、張出し片（２３）に相当する窪みが落込み口に設けられた半円弧状の彫込みを備えている。なお、図７（ｂ）は、図２（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。   As shown in FIG. 7B, the molding surface which is a parting surface of each shaping die (7a) is connected to the front end side (see FIG. 2) of the port body (21) of the port (2). It is formed by carving into a shape divided into two so that the center line and the center of the thickness of both projecting pieces (23) are included. That is, the shaping surface of the shaping die (7a) is provided with a semi-arc-shaped engraving in which a depression corresponding to the projecting piece (23) is provided in the drop opening. In addition, FIG.7 (b) illustrates the shaping metal mold | die (7a) for manufacturing the port (2) shown in FIG.2 (c).

更に、上記の成形面の彫込みは、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、その円弧の直径はポート本体（２１）の外径（ｄ０）の１．００５〜１.０５０倍に設定され、彫込みの最大深さはポート本体（２１）の外径（ｄ０）の１.０〜０.９８倍に設定される。また、張出し片（２３）を整形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）の厚さの０.５〜２.０倍に設定される。 Furthermore, the above-described engraving of the molding surface accurately forms the above-mentioned overhanging piece (23) in the port body (21), so that the diameter of the arc is 1 of the outer diameter (d 0 ) of the port body (21). 0.005 to 1.050 times, and the maximum engraving depth is set to 1.0 to 0.98 times the outer diameter (d 0 ) of the port body (21). The length of the above-mentioned dent for shaping the overhanging piece (23) is 0.6 to 0.95 times the length (l 1 ) of the enlarged diameter portion of the port component (20), and the depth of the dent is the sheet. The thickness is set to 0.5 to 2.0 times the thickness of (1s).

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７（ａ）参照））で支持したポート構成部材（２０）を図６（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（２３ｐ）を半溶融状態にした後、図７（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、張出し片（２３）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 pin-shaped port support jig (62) (see FIG. 7A)) is used as shown in FIG. ), And after preheating the port body (21) to make the enlarged diameter portion (23p) in a semi-molten state, FIG. 7 (a) As shown, the port shaping member (20) is loaded with the port component (20), the shaping die (7a) is clamped, and the overhanging piece (23) is shaped. 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、前述のバック本体（１）の例えばトップシール部（１２）のポート挿入穴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、図８に示す様なポート溶着用ヒートシール金型装置（８）、および、ポート溶着部を効率的に冷却する図９に示す様なポート溶着部冷却金型装置（９）が使用される。 (III) Port (2) welding process:
The port (2) obtained as described above is inserted into, for example, a port insertion hole of the top seal portion (12) of the back body (1) and fixed by welding. In the welding of the port (2), the port welding heat seal mold device (8) as shown in FIG. 8 and the port welding part cooling as shown in FIG. 9 for efficiently cooling the port welding part. A mold device (9) is used.

ポート溶着用ヒートシール金型装置（８）は、図８（ａ）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分割構造の金型であり、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一対のヒートシール金型（８１）を備えている。そして、各ヒートシール金型（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おり、金型基台（８４）から突出するヒートシール金型（８１）のパーティング面である加熱面（図８（ｂ）参照）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. 8A, the port welding heat seal mold apparatus (8) is a two-part mold that sandwiches the top seal portion (12) of the back body (1) from the front and back, and a cylinder. A pair of heat-sealing molds (81) configured to be relatively close to each other or away from each other by driving means (not shown) such as an apparatus is provided. An electric heater as a heating means is inserted inside each heat seal mold (81), and is a parting surface of the heat seal mold (81) protruding from the mold base (84). The heating surface (see FIG. 8B) is controlled to a temperature 20 to 80 ° C. higher than the melting point of the sheet (1s) of the plastic sheet laminate (10), for example, about 145 to 200 ° C. in the case of low density polyethylene. It is made like that.

図８（ｂ）に示す様に、各ヒートシール金型（８１）の加熱面は、トップシール部（１２）のポート挿入穴の両側部分を支持する２つのシート部支持面（８２）と、これらシート部支持面（８２）の間に設けられてポート（２）の挿入部分を支持する半円弧状のポート部支持穴（８３）とから構成される。上記の加熱面の各シート部支持面（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）と重畳する部位まで拡げられている。そして、加熱面のポート部支持穴（８３）への落込み口には、張出し片（２３）にシート（１ｓ）を溶着するため、張出し片（２３）に倣った形状の窪みが設けられる。   As shown in FIG. 8B, the heating surface of each heat seal mold (81) includes two sheet portion support surfaces (82) that support both side portions of the port insertion hole of the top seal portion (12), and A semi-circular port portion support hole (83) provided between the sheet portion support surfaces (82) and supporting the insertion portion of the port (2) is formed. Each sheet portion supporting surface (82) of the heating surface is expanded to a portion overlapping with the inner end portion (outer portion of the port insertion hole) of the top seal portion (12) heat-sealed first. And the depression | indentation of the shape which followed the protrusion piece (23) is provided in the drop opening to the port part support hole (83) of a heating surface, in order to weld a sheet | seat (1s) to an extension piece (23).

更に、上記のヒートシール金型（８１）は、トップシール部（１２）及び張出し片（２３）の肉厚を必要以上に損なうことなく、かつ、ポート挿入穴を形成する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（２３）に確実に溶着一体化するため、ポート部支持穴（８３）及び加熱面（８４）の窪みが特定の大きさに設定される。   Further, the heat seal mold (81) has two sheets (1s) that form a port insertion hole without damaging the thickness of the top seal portion (12) and the overhanging piece (23) more than necessary. ) Are 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 overhanging piece (23) of the port body (21). In order to integrate, the recess of the port support hole (83) and the heating surface (84) is set to a specific size.

すなわち、ヒートシール金型（８１）におけるポート部支持穴（８３）の直径は、ポート本体（２１）の外径（ｄ０）にシート（１ｓ）の厚さを加えた寸法の１．００５〜１.０５０倍に設定され、ポート部支持穴（８３）の最大深さは、ポート本体（２１）の外径（ｄ０）の１.１〜０.９８倍に設定される。また、加熱面（８４）の窪みの長さ（ポート部支持穴（８３）に沿った長さ）はポート本体（２１）の張出し片（２３）の０.６〜０.９５倍に設定され、窪みの深さはシート（１ｓ）の厚さの０.５〜２.０倍に設定される。 That is, the diameter of the port support hole (83) in the heat seal mold (81) is 1.005 to the dimension obtained by adding the thickness of the sheet (1s) to the outer diameter (d 0 ) of the port body (21). The maximum depth of the port portion support hole (83) is set to 1.1 to 0.98 times the outer diameter (d 0 ) of the port body (21). Further, the length of the recess on the heating surface (84) (the length along the port support hole (83)) is set to 0.6 to 0.95 times that of the projecting piece (23) of the port body (21). The depth of the recess is set to 0.5 to 2.0 times the thickness of the sheet (1s).

一方、ポート溶着部冷却金型装置（９）は、図９（ａ）に示す様に、ポート（２）が溶着されたトップシール部（１２）を表裏から挟み付ける２分割構造の金型であり、上記のポート溶着用ヒートシール金型装置（８）と同様に、相対的に又は相互に接近離間可能に構成された一対の冷却金型（９１）を備えている。そして、各冷却金型（９１）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。冷却金型（９１）のパーティング面である冷却面（図９（ｂ）参照）は、通常、プラスチックシート積層体（１０）のシート（１ｓ）の融点よりも８０〜１２０℃程度低い温度、例えば２０〜６０℃程度に制御される様になされている。   On the other hand, as shown in FIG. 9 (a), the port welded part cooling mold apparatus (9) is a two-part mold that sandwiches the top seal part (12) to which the port (2) is welded from the front and back. There is a pair of cooling molds (91) configured to be relatively close to each other or close to each other, similar to the above-described heat welding mold apparatus (8) for port welding. And each cooling die (91) can circulate cooling water inside by connecting to a cooling water circulator as a temperature adjusting means equipped with a heating device and a cooling device in order to maintain a constant temperature. Configured. The cooling surface (see FIG. 9 (b)), which is the parting surface of the cooling mold (91), is usually about 80 to 120 ° C. lower than the melting point of the sheet (1s) of the plastic sheet laminate (10), For example, the temperature is controlled to about 20 to 60 ° C.

図９（ｂ）に示す様に、各冷却金型（９１）の冷却面は、２つのシート部支持面（９２）及び半円弧状のポート部支持穴（９３）から構成される。そして、上記の冷却面のポート部支持穴（９３）への落込み口には、シート（１ｓ）が溶着された張出し片（２３）を加圧するため、張出し片（２３）に倣った形状の窪みが設けられる。   As shown in FIG. 9B, the cooling surface of each cooling mold (91) is composed of two sheet portion support surfaces (92) and a semicircular port portion support hole (93). And, in order to pressurize the overhanging piece (23) on which the sheet (1s) is welded to the entrance of the cooling surface into the port support hole (93), the shape following the overhanging piece (23) is formed. A recess is provided.

上記の冷却金型（９１）は、トップシール部（１２）に対するポート（２）の溶着力を高めるため、ポート部支持穴（９３）及び冷却面の窪みが特定の大きさに設定される。冷却金型（９１）における上記の大きさは、ヒートシール金型（８１）のポート部支持穴（８３）及び加熱面（８４）の前述の各寸法に対し、０.９５〜１.０倍に設定される。更に、シート部支持面（９２）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。上記の加工が施されている場合には、ポート溶着用ヒートシール金型装置（８）によって形成されたポート本体（２１）の側方のヒートシール部の溶着強度を一層高めることが出来る。   In the cooling mold (91), in order to increase the welding force of the port (2) to the top seal portion (12), the port portion support hole (93) and the depression of the cooling surface are set to specific sizes. The size of the cooling mold (91) is 0.95 to 1.0 times the above-described dimensions of the port support hole (83) and the heating surface (84) of the heat seal mold (81). Set to Further, the sheet support surface (92) may be subjected to a quadrangular pyramid uneven process or a knurling process. When the above processing is applied, the welding strength of the heat seal part on the side of the port body (21) formed by the port welding heat seal mold apparatus (8) can be further increased.

上記の様に、ポート（２）の溶着工程においては、先に形成されたトップシール部（１２）のポート挿入穴にポート本体（２１）を挿入し、２枚のシート（１ｓ）によって各張出し片（２３）を挟み込んだ状態において、ポート溶着用ヒートシール金型装置（８）によてポート（２）を溶着する。具体的には、図８に示す様に、ポート挿入穴にポート（２）が挿入されたバック本体（１）のトップシール部（１２）を各ヒートシール金型（８１）の間に位置させた後、各ヒートシール金型（８１）を型締してヒートシールを施す。そして、ポート（２）を溶着した後は、ポート（２）の溶着部をポート溶着部冷却金型装置（９）によって冷却する。すなわち、ポート（２）が溶着されたトップシール部（１２）を各冷却金型（９１）の間に位置させた後、各冷却金型（９１）を型締してポート溶着部に冷却を施す。   As described above, in the welding process of the port (2), the port body (21) is inserted into the port insertion hole of the top seal portion (12) formed in advance, and each overhang is formed by two sheets (1s). In a state where the piece (23) is sandwiched, the port (2) is welded by the port welding heat seal mold apparatus (8). Specifically, as shown in FIG. 8, the top seal portion (12) of the back body (1) in which the port (2) is inserted into the port insertion hole is positioned between the heat seal dies (81). After that, each heat seal mold (81) is clamped and heat sealed. And after welding a port (2), the welding part of a port (2) is cooled by the port welding part cooling die apparatus (9). That is, after the top seal portion (12) to which the port (2) is welded is positioned between the cooling dies (91), each cooling die (91) is clamped to cool the port welded portion. Apply.

上記の各工程（I）、(II)及び(III)として示す様に、本発明の製造方法は、円形パイプ状のポート本体（２１）の外周面に一対の薄肉の張出し片（２３）が張出された特定のポート（２）を使用し、ヒートシール部（例えばトップシール部（１２））のポート挿入穴にポート本体（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）によって各張出し片（２３）を挟み込んだ状態においてポート本体（２１）を溶着する。換言すれば、バック本体（１）のトップシール部（１２）においてポート本体（２１）の外周面を囲む各シート（１ｓ）の突合せ部分に張出し片（２３）を介在させて溶着することにより、前記の突合せ部分において各シート（１ｓ）の屈曲部分を鈍角の曲面に形成して張出し片（２３）と一体化させ且つヒートシール金型装置（８）で押え付けた際の前記の屈曲部分の局部的な薄肉化を防止し、突合せ部分とポート本体（２１）の外周面との界面において溶着強度の高い一体化構造を構成する。従って、本発明の製造方法によれば、ヒートシール部のポート溶着部においてピンホールが発生することのないプラスチックバック（１Ａ）を製造することが出来る。   As shown in the above steps (I), (II) and (III), the manufacturing method of the present invention has a pair of thin projecting pieces (23) on the outer peripheral surface of the circular pipe-shaped port body (21). Using the projecting specific port (2), the port body (21) is inserted into the port insertion hole of the heat seal part (for example, the top seal part (12)), and two sheets of the plastic sheet laminate (10) The port body (21) is welded in a state where the overhang pieces (23) are sandwiched between the sheet (1s). In other words, the top seal portion (12) of the back body (1) is welded by interposing a protruding piece (23) at the butting portion of each sheet (1s) surrounding the outer peripheral surface of the port body (21), In the butt portion, the bent portion of each sheet (1s) is formed into an obtuse curved surface so as to be integrated with the projecting piece (23) and pressed by the heat seal mold device (8). Local thinning is prevented, and an integrated structure with high welding strength is formed at the interface between the butted portion and the outer peripheral surface of the port body (21). Therefore, according to the manufacturing method of the present invention, it is possible to manufacture the plastic bag (1A) in which no pinhole is generated in the port weld portion of the heat seal portion.

本発明に係るプラスチックバッグの一形態を示す平面図である。It is a top view which shows one form of the plastic bag which concerns on this invention. 本発明に係るプラスチックバッグに使用されるポートの形状を一部破断して示す側面図である。It is a side view which shows the shape of the port used for the plastic bag which concerns on this invention partially fractured | ruptured. 本発明に係るプラスチックバッグにおけるポート溶着部の構造をポート本体に直交する方向に破断して示す断面図である。It is sectional drawing which fractures | ruptures and shows the structure of the port welding part in the plastic bag which concerns on this invention in the direction orthogonal to a port main body. 本発明に係るプラスチックバッグの製造方法に適用される装置を示す図であり、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 figure which shows the apparatus applied to the manufacturing method of the plastic bag which concerns on this invention, and is a side view which shows the outline | summary of the heat seal apparatus which heat-seals a bag main body, and arrangement | positioning of a heat seal metal mold | die and a heat seal part cooling mold FIG. 図４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の一形態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 one form of the heat seal metal mold | die and heat seal part cooling metal mold | die used for the heat seal apparatus of FIG. 本発明に係るプラスチックバッグの製造方法に適用される部材および装置を示す図であり、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加熱加工を施す加熱炉装置の一形態を示す縦断面図である。It is a figure which shows the member and apparatus applied to the manufacturing method of the plastic bag which concerns on this invention, and is the side view which shows the port structural member used for manufacture of a port, and the heating furnace which heat-processes to the front end side of a port structural member It is a longitudinal cross-sectional view which shows one form of an apparatus. 本発明に係るプラスチックバッグの製造方法に適用される装置を示す図であり、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 a figure which shows the apparatus applied to the manufacturing method of the plastic bag which concerns on this invention, and is a 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 shaping metal It is a perspective view which shows a structure. 本発明に係るプラスチックバッグの製造方法に適用される装置を示す図であり、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の一形態を示す正面図および加熱面の形状を示す側面図である。It is a figure which shows the apparatus applied to the manufacturing method of the plastic bag which concerns on this invention, and is the front view which shows one form of the heat-sealing mold apparatus for port welding used for welding of a port, and the side which shows the shape of a heating surface FIG. 本発明に係るプラスチックバッグの製造方法に適用される装置を示す図であり、ポートの溶着に使用されるポート溶着部冷却金型装置の一形態を示す正面図および冷却面の形状を示す側面図である。It is a figure which shows the apparatus applied to the manufacturing method of the plastic bag which concerns on this invention, and is a front view which shows one form of the port welding part cooling mold apparatus used for welding of a port, and a side view which shows the shape of a cooling surface It is. 従来のプラスチックバッグにおけるポート溶着部を示す平面図およびポート本体に直交する断面図である。It is the top view which shows the port welding part in the conventional plastic bag, and sectional drawing orthogonal to a port main body.

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 ：シート
１ ：バック本体
１２ ：トップシール部
１３ ：ボトムシール部
１４ ：サイドシール部
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 ：張出し片
２３ｐ：拡径部
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
８ ：ポート溶着用ヒートシール金型装置
８１ ：ヒートシール金型
８２ ：シート部支持面
８３ ：ポート部支持穴
９ ：ポート溶着部冷却金型装置
９１ ：冷却金型
９２ ：シート部支持面
９３ ：ポート部支持穴 DESCRIPTION OF SYMBOLS 1A: Plastic bag 10: Plastic sheet laminated body 1s: Sheet 1: Back main body 12: Top seal part 13: Bottom seal part 14: Side seal part 15: Inner edge of heat seal part 2: Port 20: Port component 21: Port Main body 22: Mouth plug mounting portion 23: Overhang piece 23p: Expanded portion 3: Heat seal device 32: Receptacle for seal 4: Heat seal mold 4a: Top seal component 4b: Bottom seal component 4c: Side seal component Part 4s: Heating surface 5: Heat seal part cooling mold 5a: Top seal cooling part 5b: Bottom seal cooling part 5c: Side seal cooling part 5s: Cooling surface 6: Heating furnace apparatus 7: Port shaping mold apparatus 70: Mold Mold moving mechanism 7a: Shaping mold 74: Mold support base 8: Heat sealing mold for port welding Location 81: a heat seal die 82: seat supporting surface 83: Port unit support hole 9: Port welded portion cooling mold device 91: cooling mold 92: seat supporting surface 93: port section supporting hole

Claims (7)

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であって、前記ポートは、円形パイプ状のポート本体の外周面に対して当該ポート本体の中心線周りに対称な位置に一対の薄肉の張出し片を張り出して構成され、そして、前記ポートは、前記ヒートシール部に形成されたポート挿入穴に前記ポート本体を挿入され、かつ、プラスチックシート積層体の２枚のシートによって前記各張出し片を挟み込まれた状態で溶着されていることを特徴とするプラスチックバッグ。   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, wherein the port is a circular pipe-shaped port A pair of thin projecting pieces are projected at symmetrical positions around the center line of the port body with respect to the outer peripheral surface of the body, and the port is inserted into the port insertion hole formed in the heat seal portion. A plastic bag, wherein a port body is inserted and the protruding pieces are sandwiched between two sheets of a plastic sheet laminate. 請求項１に記載のプラスチックバッグの製造方法であって、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、ヒートシール部にポート挿入穴が形成されたバッグ本体を製造した後、前記ポートとして、円形パイプ状のポート本体の外周面に対して当該ポート本体の中心線周りに対称な位置に一対の薄肉の張出し片を張り出して構成されたポートを使用し、前記バッグ本体のヒートシール部のポート挿入穴に前記ポート本体を挿入し、プラスチックシート積層体の２枚のシートによって前記各張出し片を挟み込んだ状態において、前記ヒートシール部に前記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。   It is a manufacturing method of the plastic bag of Claim 1, Comprising: After manufacturing the bag main body in which the port insertion hole was formed in the heat seal part by giving a heat seal to a plastic sheet laminated body, it is circular as said port. Using a port constructed by projecting a pair of thin projecting pieces in a symmetrical position around the centerline of the port body with respect to the outer peripheral surface of the pipe-shaped port body, inserting the port of the heat seal portion of the bag body A method for manufacturing a plastic bag, comprising: inserting the port main body into a hole and welding the port main body to the heat seal portion in a state where the protruding pieces are sandwiched between two sheets of a plastic sheet laminate. . ポートにおける各張出し片の張出し方向に沿った厚さ部分の断面形状が尖鋭に形成されている請求項２に記載のプラスチックバッグの製造方法。   The method for producing a plastic bag according to claim 2, wherein a cross-sectional shape of a thickness portion along a protruding direction of each protruding piece in the port is formed sharply. ポートにおける各張出し片のポート本体外周面からの張出し長さがシートの厚さの２〜１０倍である請求項２又は３に記載のプラスチックバッグの製造方法。   The method for producing a plastic bag according to claim 2 or 3, wherein the overhang length of each overhang piece at the port from the outer peripheral surface of the port body is 2 to 10 times the thickness of the sheet. ポートにおける各張出し片のポート本体の中心線に沿った長さがバッグ本体のヒートシール部のポート挿入穴の長さの０．６〜０．９５倍である請求項２〜４の何れかに記載のプラスチックバッグの製造方法。   The length along the center line of the port main body of each overhanging piece at the port is 0.6 to 0.95 times the length of the port insertion hole of the heat seal portion of the bag main body. The manufacturing method of the plastic bag of description. 略円形パイプ状のポート本体と口栓装着部を有し且つ前記ポート本体の先端側が厚肉の拡径部になされたポート構成部材を射出成形し、前記ポート構成部材の先端側の拡径部を整形金型によって加熱整形することによりポートを製造する請求項２〜５の何れかに記載のプラスチックバッグの製造方法。   A port component having a substantially circular pipe-shaped port main body and a plug mounting portion and having a thickened enlarged portion on the distal end side of the port main body is injection-molded, and the enlarged diameter portion on the distal end side of the port configured member The manufacturing method of the plastic bag in any one of Claims 2-5 which manufactures a port by heat shaping with a shaping die. ポート構成部材は、ポート本体の基端側の外径に対し、拡径部の最大外径が１．０１〜１．０５倍、ポート本体の中心線に沿った拡径部の長さが０．６０〜２．５倍、ポート本体の先端の外径が１．０〜０．９０倍である請求項６に記載のプラスチックバッグの製造方法。   The port constituent member has a maximum outer diameter of 1.01 to 1.05 times the outer diameter of the base end side of the port main body, and the length of the enlarged diameter section along the center line of the port main body is 0. 7. The method for producing a plastic bag according to claim 6, wherein the outer diameter of the tip of the port main body is 1.0 to 0.90 times.
JP2005185464A 2005-06-24 2005-06-24 Plastic bag and its manufacturing method Pending JP2007000452A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009208836A (en) * 2008-03-06 2009-09-17 Oshio Sangyo Kk Self-standing wrapping bag and its manufacturing method
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
JP2018062113A (en) * 2016-10-12 2018-04-19 藤森工業株式会社 Spout seal mold unit, spout attachment method using the same, and spout attachment structure
US20220089307A1 (en) * 2016-08-26 2022-03-24 Kiefel Gmbh Device for filling a bag, bag contour sealing tool, sealing tool, method for filling a bag, method for producing a bag, system and bag

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JP2940987B2 (en) * 1990-03-19 1999-08-25 昭和電工株式会社 Faucet sealing method
JP2000062813A (en) * 1998-08-20 2000-02-29 Dainippon Printing Co Ltd Spout-attached pouch
JP2004188039A (en) * 2002-12-12 2004-07-08 Terumo Corp Package body storing container body filled with aqueous formulation comprising vitamin b1s

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Publication number Priority date Publication date Assignee Title
JP2940987B2 (en) * 1990-03-19 1999-08-25 昭和電工株式会社 Faucet sealing method
JP2000062813A (en) * 1998-08-20 2000-02-29 Dainippon Printing Co Ltd Spout-attached pouch
JP2004188039A (en) * 2002-12-12 2004-07-08 Terumo Corp Package body storing container body filled with aqueous formulation comprising vitamin b1s

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009208836A (en) * 2008-03-06 2009-09-17 Oshio Sangyo Kk Self-standing wrapping bag and its manufacturing method
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
US20220089307A1 (en) * 2016-08-26 2022-03-24 Kiefel Gmbh Device for filling a bag, bag contour sealing tool, sealing tool, method for filling a bag, method for producing a bag, system and bag
JP2018062113A (en) * 2016-10-12 2018-04-19 藤森工業株式会社 Spout seal mold unit, spout attachment method using the same, and spout attachment structure

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