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JP5489214B2 - Thermal welding method for thermoplastic resin molded products - Google Patents
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JP5489214B2 - Thermal welding method for thermoplastic resin molded products - Google Patents

Thermal welding method for thermoplastic resin molded products Download PDF

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Publication number
JP5489214B2
JP5489214B2 JP2009288931A JP2009288931A JP5489214B2 JP 5489214 B2 JP5489214 B2 JP 5489214B2 JP 2009288931 A JP2009288931 A JP 2009288931A JP 2009288931 A JP2009288931 A JP 2009288931A JP 5489214 B2 JP5489214 B2 JP 5489214B2
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JP
Japan
Prior art keywords
heating element
resistance heating
welding
resin
case
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.)
Expired - Fee Related
Application number
JP2009288931A
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Japanese (ja)
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JP2011126233A (en
Inventor
昌浩 田中
寿彦 斉藤
敦 小林
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.)
Munekata Industrial Machinery Co Ltd
Original Assignee
Munekata Industrial Machinery Co Ltd
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Filing date
Publication date
Application filed by Munekata Industrial Machinery Co Ltd filed Critical Munekata Industrial Machinery Co Ltd
Priority to JP2009288931A priority Critical patent/JP5489214B2/en
Publication of JP2011126233A publication Critical patent/JP2011126233A/en
Application granted granted Critical
Publication of JP5489214B2 publication Critical patent/JP5489214B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • 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
    • B29C65/82—Testing the joint
    • B29C65/8207—Testing the joint by mechanical methods
    • B29C65/8215—Tensile tests
    • 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
    • B29C65/82—Testing the joint
    • B29C65/8207—Testing the joint by mechanical methods
    • B29C65/8246—Pressure tests, e.g. hydrostatic pressure tests
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
    • B29C66/12443—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue having the tongue substantially in the middle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2424—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24243—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral
    • B29C66/24244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle
    • B29C66/24245—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle forming a square
    • 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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • 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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—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
    • B29C66/8246—Servomechanisms, e.g. servomotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B29C66/87—Auxiliary operations or devices
    • B29C66/872—Starting or stopping procedures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91441—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time
    • B29C66/91443—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time following a temperature-time profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • B29C66/91643—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile
    • B29C66/91645—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile by steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91653—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the voltage, i.e. the electric potential difference or electric tension
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • B29C66/91951—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 time, e.g. temperature-time diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/922—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9231—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the displacement of the joining tools
    • B29C66/92311—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the displacement of the joining tools with special measurement means or methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/959—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables
    • B29C66/9592—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables in explicit relation to another variable, e.g. X-Y diagrams
    • 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
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Plasma & Fusion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

本発明は、熱可塑性樹脂で成形された成形品の熱溶着面間に抵抗発熱体を挟み込み、この抵抗発熱体に電圧を印加して発熱させ、この発熱で溶着面の樹脂を溶融して成形品同士を熱溶着する熱可塑性樹脂からなる成形品の熱溶着方法に関する。   In the present invention, a resistance heating element is sandwiched between heat welding surfaces of a molded product molded from a thermoplastic resin, a voltage is applied to the resistance heating element to generate heat, and the resin on the welding surface is melted and molded by this heat generation. The present invention relates to a method for heat welding a molded product made of a thermoplastic resin for heat welding products.

熱可塑性樹脂で成形されたお互いの成形品を接合する方法の一つとして、その接合面に電気抵抗に基づく発熱体（以下「抵抗発熱体」と称する。）を挟み込み、成形品を適宜な力で押圧しながら前記抵抗発熱体に電圧を印加して発熱させ、その熱で接合面の樹脂を溶融し、その後、電圧の印加を止めて冷却することにより溶融した樹脂を硬化させて成形品同士を溶着する熱溶着方法が公知である（特開昭５８−５９０５０号）。   As one of the methods for joining the molded products formed of thermoplastic resin, a heating element based on electric resistance (hereinafter referred to as “resistance heating element”) is sandwiched between the joining surfaces, and the molded product is subjected to an appropriate force. Applying voltage to the resistance heating element while pressing with heat to melt the resin on the joint surface with the heat, and then curing the molten resin by stopping the voltage application and cooling A heat welding method for welding is known (Japanese Patent Laid-Open No. 58-59050).

この方法は、瞬間的な熱による接合方法であるため、内部部品や外観上に何等影響を与えることなく、設備も簡単な装置で可能であることから、実用的に極めて有効な接合方法である。   Since this method is a bonding method using instantaneous heat, it is possible to use a simple apparatus without affecting the internal components and appearance, so it is a practically extremely effective bonding method. .

特開昭５８−５９０５０号公報JP 58-59050 A

上記公知の熱溶着方法の場合、熱可塑性樹脂に抵抗発熱体を挟み込んで熱溶着を行う場合、一定の押圧力を加えながら加熱を続ける従来のＰＳ、ＰＰ，ＡＢＳなどの汎用樹脂を使用した成形品においては問題なく溶着が可能であった。   In the case of the above known heat welding method, when performing heat welding by sandwiching a resistance heating element in a thermoplastic resin, molding using conventional general-purpose resin such as PS, PP, ABS, etc. that continues heating while applying a certain pressing force The product could be welded without problems.

しかし、ナイロンやＰＰＳなど溶融温度が２８０℃を超えるエンジニアリングプラスチックやガラスフィラーなどを高含有に添加して機械特性を向上させた樹脂の溶着においては、抵抗発熱体の載置位置の偏りや、加熱工程における抵抗発熱体の熱膨張による抵抗発熱体の蛇行によって溶着面に昇温のばらつきが発生しやすく、先に融点に達した部分の樹脂だけが一気に低粘度化して急速な流動や樹脂のはみ出しが発生する。その結果、溶着面樹脂の低密度化、ボイド発生、不完全溶融部の発生により溶着強度や耐漏洩性の低下等を生じるという問題があった。特にガラスフィラーなどを添加した樹脂の場合にはこの傾向が顕著である。   However, in the welding of resin whose mechanical properties have been improved by adding a high content of engineering plastics or glass fillers, such as nylon and PPS, whose melting temperature exceeds 280 ° C., there is a bias in the mounting position of the resistance heating element and heating The resistance heating element meanders due to the thermal expansion of the resistance heating element in the process, and it is easy for temperature fluctuations to occur on the welded surface. Only the resin that has reached the melting point first decreases in viscosity at a stretch, causing rapid flow and resin overflow. Occurs. As a result, there has been a problem that the weld strength and leakage resistance are reduced due to the lower density of the welded surface resin, the generation of voids, and the occurrence of incompletely melted portions. This tendency is particularly remarkable in the case of a resin to which a glass filler or the like is added.

よって、前記溶融温度が２８０℃を超える樹脂やフィラー入り樹脂においては抵抗発熱体を挟み込んだ溶着部分を完全に溶着して強度や耐漏洩性を確保することができる溶着方法の提案が望まれている。   Therefore, it is desired to propose a welding method capable of ensuring the strength and leakage resistance by completely welding the welded portion sandwiching the resistance heating element in the resin having the melting temperature exceeding 280 ° C. or the resin containing filler. Yes.

本発明は、上記した課題を解決するのが目的であって、その溶着方法は次のとおりである。
ａ．熱可塑性樹脂で成形された成形品同士の接合面に抵抗発熱体を挟み込み、この抵抗発熱体に電圧を印加して発熱させることにより接合面の溶融を図り、更に接合面間に面圧 をかけて接合面同士を熱溶着する方法において、
ｂ．接合面の熱負荷に大小の違いがある場合には熱負荷の大きい側のみ、又は熱負荷の大小を問わずその双方に予熱をかける第一工程、
ｃ．次に、前記抵抗発熱体に印加して発熱させる電圧を前記接合面が軟化する温度に制御し ながら接合面間の距離を一定のところまで接近させて抵抗発熱体の外形の一部を接合面 の双方に喰い込ませる第二工程、
ｄ．次に、前記抵抗発熱体に対する電圧の印加を接合面の溶融温度以上となるように制御 しながら更に接合面に面圧をかけて互いの接合面を溶融し、熱溶着する第三工程からなること、を特徴とするものである。
この発明によると、溶融する前に抵抗発熱体の位置が接合面において固定されるため、抵抗発熱体が溶融温度に達し、接合面が溶融しても位置ずれが発生しない。 The object of the present invention is to solve the above-mentioned problems, and the welding method is as follows.
a. A resistance heating element is sandwiched between the joint surfaces of molded products made of thermoplastic resin, and a voltage is applied to the resistance heating element to generate heat, thereby melting the joint surfaces and further applying a surface pressure between the joint surfaces. In the method of thermally welding the joint surfaces together,
b. When there is a difference in the thermal load on the joint surface, only the side with the large thermal load, or the first step of preheating both the thermal load regardless of the size,
c. Next, while controlling the voltage to be applied to the resistance heating element to generate heat and controlling the temperature at which the bonding surface is softened, the distance between the bonding surfaces is brought close to a certain point so that a part of the outer shape of the resistance heating element is bonded to the bonding surface. The second process to eat both
d. Then, made from the third step of the resistance to application of a voltage to the heating element by applying a surface pressure to the further joint surface while controlling so that the above melting temperature of the joining surfaces to melt the bonding surfaces to each other, heat sealing It is characterized by this.
According to the present invention, since the position of the resistance heating element is fixed on the joining surface before melting, the resistance heating element reaches the melting temperature, and no displacement occurs even if the joining surface melts.

本発明は以上のように、熱溶着の工程において、先ず抵抗発熱体の温度を接合面の軟化温度に制御し、この段階で接合面間の距離を狭めて抵抗発熱体の外周の一部を接合面に喰い込ませることにより接合面間における抵抗発熱体の位置決めを行い、その後、抵抗発熱体の温度を接合面の溶融温度に制御して接合面の溶融を行い、再度接合面間の距離を狭めて溶着を行うようにした。   As described above, according to the present invention, in the heat welding process, first, the temperature of the resistance heating element is controlled to the softening temperature of the bonding surface, and at this stage, the distance between the bonding surfaces is reduced to reduce a part of the outer periphery of the resistance heating element. Position the resistance heating element between the joining surfaces by biting into the joining surface, then control the temperature of the resistance heating element to the melting temperature of the joining surface, melt the joining surface, and again the distance between the joining surfaces Narrowing was performed to perform welding.

この結果、接合面の溶融温度が２８０℃以上の樹脂成形品あるいはフィラー配合の樹脂成形品の接合において抵抗発熱体の位置ずれが発生し、溶着強度が低下したり、耐漏洩性能が低下したりするという溶着欠陥が発生しなくなる。   As a result, the position of the resistance heating element is shifted in the bonding of a resin molded product having a melting temperature of 280 ° C. or higher or a resin compounded product containing a filler, resulting in a decrease in welding strength or leakage resistance. This prevents the occurrence of welding defects.

対象ガラスフィラー配合ケース本体及びカバー並びに抵抗発熱体を示す分解斜視図である。It is a disassembled perspective view which shows a target glass filler combination case main body, a cover, and a resistance heating element. 前記カバーとケース本体を溶着した状態を示す斜視図である。It is a perspective view which shows the state which welded the said cover and the case main body. ケース本体とカバーの接合面間に抵抗発熱体を挟み込み、溶着が終了するまでの各工程の説明図である。It is explanatory drawing of each process until a resistance heating element is inserted | pinched between the joint surfaces of a case main body and a cover, and welding is complete | finished. ケース本体とカバーの接合面間に抵抗発熱体を挟み込み、溶着が終了するまでの各工程の説明図である。It is explanatory drawing of each process until a resistance heating element is inserted | pinched between the joint surfaces of a case main body and a cover, and welding is complete | finished. ケース本体とカバーの接合面間に抵抗発熱体を挟み込み、溶着が終了するまでの各工程の説明図である。It is explanatory drawing of each process until a resistance heating element is inserted | pinched between the joint surfaces of a case main body and a cover, and welding is complete | finished. ケース本体とカバーの接合面間に抵抗発熱体を挟み込み、溶着が終了するまでの各工程の説明図である。It is explanatory drawing of each process until a resistance heating element is inserted | pinched between the joint surfaces of a case main body and a cover, and welding is complete | finished. ケース本体とカバーの接合面間に抵抗発熱体を挟み込み、溶着が終了するまでの各工程の説明図である。It is explanatory drawing of each process until a resistance heating element is inserted | pinched between the joint surfaces of a case main body and a cover, and welding is complete | finished. ケース本体とカバーの接合面間に抵抗発熱体を挟み込み、溶着が終了するまでの各工程の説明図である。It is explanatory drawing of each process until a resistance heating element is inserted | pinched between the joint surfaces of a case main body and a cover, and welding is complete | finished. ケース本体とカバーの接合面間に抵抗発熱体を挟み込み、溶着が終了するまでの各工程の説明図である。It is explanatory drawing of each process until a resistance heating element is inserted | pinched between the joint surfaces of a case main body and a cover, and welding is complete | finished. ケース本体とカバーの接合面間に抵抗発熱体を挟み込み、溶着が終了するまでの各工程の説明図である。It is explanatory drawing of each process until a resistance heating element is inserted | pinched between the joint surfaces of a case main body and a cover, and welding is complete | finished. ＰＰＳ＋ガラスフィラー４０％添加樹脂において従来工法により溶着する工程と溶融した樹脂がケース本体とカバーの合わせ目からはみ出し、ボイドが発生する過程の説明図である。It is explanatory drawing of the process in which the process welded by the conventional construction method in PPS + glass filler 40% addition resin, and the molten resin protrude from the joint line of a case main body and a cover, and a void generate | occur | produces. ＰＰＳ＋ガラスフィラー４０％添加樹脂において従来工法により溶着する工程と溶融した樹脂がケース本体とカバーの合わせ目からはみ出し、ボイドが発生する過程の説明図である。It is explanatory drawing of the process in which the process welded by the conventional construction method in PPS + glass filler 40% addition resin, and the molten resin protrude from the joint line of a case main body and a cover, and a void generate | occur | produces. ＰＰＳ＋ガラスフィラー４０％添加樹脂において従来工法により溶着する工程と溶融した樹脂がケース本体とカバーの合わせ目からはみ出し、ボイドが発生する過程の説明図である。It is explanatory drawing of the process in which the process welded by the conventional construction method in PPS + glass filler 40% addition resin, and the molten resin protrude from the joint line of a case main body and a cover, and a void generate | occur | produces. 抵抗発熱体（ワイヤー）の温度プロファイルの説明図である。It is explanatory drawing of the temperature profile of a resistance heating element (wire). 接合面の面圧のプロファイルの説明図である。It is explanatory drawing of the profile of the surface pressure of a joint surface. 溶着電力のプロファイルの説明図である。It is explanatory drawing of the profile of welding electric power. 溶着強度の比較説明図である。It is comparison explanatory drawing of welding strength. 漏洩試験結果の説明図である。It is explanatory drawing of a leak test result. 本発明と従来例における溶融範囲の説明図である。It is explanatory drawing of the melting range in this invention and a prior art example. 本発明を実施するための溶着装置の説明図である。It is explanatory drawing of the welding apparatus for implementing this invention.

本発明は、内部に電子部品を組み込んだ樹脂製のケース本体に対してカバーを溶着してケース本体内を密閉する時に適用される。   The present invention is applied when a cover is welded to a resin case body in which an electronic component is incorporated, and the inside of the case body is sealed.

このようなケース本体とカバーの溶着においては、一定の溶着強度が要求され、かつ水密及び気密構造が要求される。   In such welding of the case body and the cover, a certain welding strength is required, and a watertight and airtight structure is required.

特に、溶着温度が比較的低い樹脂の場合には、抵抗発熱体を樹脂の溶融温度まで上昇させたのち、ケース本体とカバーとの接合面に一気に面圧をかけて溶着することが可能であったが、樹脂の溶融温度が高く、あるいはガラスフィラーのような強化材料が配合されている樹脂の場合は、抵抗発熱体の温度を樹脂の溶融温度まで高めたのち一気に溶着する方法を採用すると、抵抗発熱体の温度が高くなった分抵抗発熱体に熱変形（線膨張）が発生しやすくなり、接合面において抵抗発熱体に蛇行現象が発生し、位置ずれが生じて溶着強度の低下や耐漏洩性能の低下を招く要因となっている。   In particular, in the case of a resin having a relatively low welding temperature, it is possible to raise the resistance heating element to the melting temperature of the resin and then apply the surface pressure to the joint surface between the case body and the cover at once. However, in the case of a resin having a high resin melting temperature or a resin in which a reinforcing material such as a glass filler is blended, a method of welding at once after increasing the temperature of the resistance heating element to the melting temperature of the resin, As the temperature of the resistance heating element increases, thermal deformation (linear expansion) is likely to occur in the resistance heating element, and a meandering phenomenon occurs in the resistance heating element at the joint surface, resulting in misalignment and a decrease in welding strength or resistance. This is a factor that causes a decrease in leakage performance.

また、フィラーを配合した樹脂の場合は、溶融温度を高く設定し、かつ溶着時間を長く設定することから、樹脂の性状が変化して強度に影響することがある。   In the case of a resin containing a filler, since the melting temperature is set high and the welding time is set long, the properties of the resin may change and affect the strength.

本発明に係る熱溶着方法は、これらの問題点をすべて解消するものである。   The thermal welding method according to the present invention solves all of these problems.

特に、本発明の適用において有効性を発揮する樹脂としては次のものを挙げることができる。ＡＢＳ樹脂（ＡＢＳ）、ポリアセタール（ＰＯＭ）、メタクリル（ＰＭＭＡ）、ポリアミド（ＰＡ）、ポリカーボネート（ＰＣ）、ポニフェニレンサルファイド（ＰＰＳ）、ポリプロピレン（ＰＰ）、ポリスチレン（ＰＳ）、ポリ塩化ビニル（ＰＶＣ）、ポリブチレンテレフタレート（ＰＢＴ）、ＡＳ（ＡＳ）およびそのアロイ等。   In particular, the following resins can be listed as effective resins in the application of the present invention. ABS resin (ABS), polyacetal (POM), methacryl (PMMA), polyamide (PA), polycarbonate (PC), poniphenylene sulfide (PPS), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), Polybutylene terephthalate (PBT), AS (AS) and its alloys.

また、樹脂に対する配合材料としてはガラスフィラー、ガラスビーズ、タルクなどを代表例として挙げることができる。   Moreover, as a compounding material with respect to resin, a glass filler, a glass bead, a talc etc. can be mentioned as a representative example.

本発明が適用される実施例としての溶着対象物は、図１、図２に示すような電子部品を内装するケース１であって、このケース１は、ケース本体２とカバー３から成り、ケース本体２の上向きの周壁２ａの上端面には底部が当接面２ｂとなる溝２ｃが周設されている。   An object to be welded as an embodiment to which the present invention is applied is a case 1 in which an electronic component as shown in FIGS. 1 and 2 is housed, and the case 1 includes a case main body 2 and a cover 3. The upper end surface of the upward peripheral wall 2a of the main body 2 is provided with a groove 2c whose bottom is a contact surface 2b.

一方、カバー３側の下向きの周壁３ａの下端面には、先端部が当接面３ｂとなり、前記溝２ａ内に挿入されるリブ３ｃが周設されている。   On the other hand, at the lower end surface of the downward peripheral wall 3a on the cover 3 side, the tip portion is a contact surface 3b, and a rib 3c inserted into the groove 2a is provided around.

４は前記ケース本体２の当接面２ｂとカバー３の当接面３ｂ間に組み込んで双方を溶着するための線状の抵抗発熱体（ワイヤー）である。   Reference numeral 4 denotes a linear resistance heating element (wire) that is assembled between the contact surface 2b of the case body 2 and the contact surface 3b of the cover 3 and welds both.

抵抗発熱体４には、例えば硬鋼線（ＳＷ）、ニッケル−クロム合金、鉄−クロム合金、鉄−ニッケル合金及びステンレス等が用いられる。   For the resistance heating element 4, for example, a hard steel wire (SW), a nickel-chromium alloy, an iron-chromium alloy, an iron-nickel alloy, and stainless steel are used.

次に、図３から図１０を用いて本発明に係る熱溶着方法を説明する前に、図２０を用いて熱溶着装置の構成を説明する。   Next, before explaining the thermal welding method according to the present invention with reference to FIGS. 3 to 10, the configuration of the thermal welding apparatus will be described with reference to FIG.

この図２０において、１０は熱溶着前のケース１がセットされるベースであって、このベース１０上にはケース本体２の溝２ｃの当接面２ｂの中央に抵抗発熱体４を組み付けると共にカバー３の周壁３ａのリブ３ｃを溝２ｃ内に嵌入することにより、当接面３ｂが抵抗発熱体４に上方から接触した状態（図３の状態）のケース１がセットされている。   In FIG. 20, reference numeral 10 denotes a base on which the case 1 before heat welding is set. On the base 10, a resistance heating element 4 is assembled at the center of the contact surface 2 b of the groove 2 c of the case body 2 and a cover is provided. By inserting the rib 3c of the peripheral wall 3a into the groove 2c, the case 1 in a state where the contact surface 3b is in contact with the resistance heating element 4 from above (the state shown in FIG. 3) is set.

１１は前記抵抗発熱体４の電圧印加部４ａ（図１参照）に電圧を印加するリード線、１２はＡＣを電源とする電圧印加部、１３はこの電圧印加部１２からリード線１１を経由して抵抗発熱体４に印加する電圧を制御することにより、抵抗発熱体４の発熱量を調節する電圧（電力）制御部である。   11 is a lead wire for applying a voltage to the voltage application unit 4a (see FIG. 1) of the resistance heating element 4, 12 is a voltage application unit using AC as a power source, and 13 is via the lead wire 11 from the voltage application unit 12. This is a voltage (power) controller that controls the amount of heat generated by the resistance heating element 4 by controlling the voltage applied to the resistance heating element 4.

１４は前記ベース１０上において、セットされたケース１のカバー３に対して上方から押しの力を負荷するためのサーボシリンダー、１５はサーボシリンダー１４の駆動を制御する加圧制御部である。   Reference numeral 14 denotes a servo cylinder for applying a pressing force from above to the cover 3 of the set case 1 on the base 10, and 15 is a pressurizing control unit for controlling the drive of the servo cylinder 14.

１６はサーボシリンダー１４の下降量からカバー３の沈み量を検出する位置検出部、１７は当接面２ｂと３ｂ間の面圧を検出する面圧検出部であって、位置検出部１６の位置検出センサーにはキーエンス社製の接触式デジタルセンサGT2-H12が、面圧検出部１７の面圧検出センサーには共和電業社製の小型圧縮型ロードセルLCX-A-10KN-IDが用いられている。   Reference numeral 16 denotes a position detection unit for detecting the amount of sinking of the cover 3 from the descending amount of the servo cylinder 14, and 17 is a surface pressure detection unit for detecting the surface pressure between the contact surfaces 2b and 3b. A contact type digital sensor GT2-H12 manufactured by Keyence Corporation is used as the detection sensor, and a small compression type load cell LCX-A-10KN-ID manufactured by Kyowa Electric Industry Co., Ltd. is used as the surface pressure detection sensor of the surface pressure detection unit 17.

１８は前記位置検出部１６及び面圧検出部１７からの信号に基づき加圧制御部１５を経由してサーボシリンダー１４の駆動を制御し、併せて電圧印加部１２を電圧制御部１３を経由して制御するコントローラーである。   18 controls the drive of the servo cylinder 14 via the pressure control unit 15 based on the signals from the position detection unit 16 and the surface pressure detection unit 17, and the voltage application unit 12 also passes through the voltage control unit 13. Controller.

以上に説明した熱溶着装置は、請求項５に記載した発明に対応しており、次にこの熱溶着装置を用いて行う熱溶着方法を図３〜図１０に基づいて詳細に説明する。   The thermal welding apparatus described above corresponds to the invention described in claim 5, and the thermal welding method performed using this thermal welding apparatus will be described in detail with reference to FIGS. 3 to 10.

図３は初期設定の段階を示し、抵抗発熱体４は溝２ｃ内の当接面２ｂとリブ３ｃの先端の当接面３ｂ間に挟持されている。この状態において熱溶着スタートスイッチが入ると、コントローラー１８から電圧制御部１３を経由して当接面２ｂ、３ｂの軟化温度となる発熱量を維持する電圧が電圧印加部１２を経由して抵抗発熱体４に印加されることにより、抵抗発熱体４が発熱し、この熱で当接面２ｂ、３ｂが軟化する。   FIG. 3 shows an initial setting stage. The resistance heating element 4 is sandwiched between the contact surface 2b in the groove 2c and the contact surface 3b at the tip of the rib 3c. When the heat welding start switch is turned on in this state, a voltage that maintains a heat generation amount that becomes the softening temperature of the contact surfaces 2b and 3b from the controller 18 via the voltage control unit 13 causes resistance heating through the voltage application unit 12. The resistance heating element 4 generates heat by being applied to the body 4, and the contact surfaces 2b and 3b are softened by this heat.

この軟化に併せて加圧制御部１５からサーボシリンダー１４に信号が送られてサーボシリンダー１４が駆動を開始し、カバー３が下降して当接面２ｂ、３ｂに面圧がかかり、抵抗発熱体４の外周の一部が当接面２ｂ、３ｂにおいて図４の状態から図６に示す状態に喰い込み、位置が定まる。   Along with this softening, a signal is sent from the pressurization control unit 15 to the servo cylinder 14 and the servo cylinder 14 starts to be driven, the cover 3 is lowered and a contact pressure is applied to the contact surfaces 2b and 3b. A part of the outer periphery of 4 bites into the state shown in FIG. 6 from the state shown in FIG.

この状態で、位置検出部１６からコントローラー１８に位置検出信号が入力されると、コントローラー１８から電圧制御部１３、電圧印加部１２を経由して抵抗発熱体４へ当接面２ｂ、３ｂが溶融する発熱量となる電圧が印加されて抵抗発熱体４が溶融温度に上昇し、併せてサーボシリンダー１４に信号が送られてこのサーボシリンダー１４が駆動してリブ３Ｃ（カバー３）を下降させる。   In this state, when a position detection signal is input from the position detection unit 16 to the controller 18, the contact surfaces 2 b and 3 b are melted from the controller 18 to the resistance heating element 4 via the voltage control unit 13 and the voltage application unit 12. The resistance heating element 4 rises to the melting temperature by applying a voltage that generates the generated heat, and a signal is sent to the servo cylinder 14 to drive the servo cylinder 14 and lower the rib 3C (cover 3).

この結果、当接面２ｂ、３ｂが溶融を開始し（図７）、当接面２ｂに当接面３ｂが限りなく接近して溶融部が拡がり（図８）、やがてこの溶融した樹脂は抵抗発熱体４を取り囲む（図９）。この図９の状態は、ケース本体２にカバー３が押圧されて閉じられた状態であり、この状態は面圧検出部１７で検出され、ここからの信号がコントローラー１８に入力される。   As a result, the contact surfaces 2b and 3b start to melt (FIG. 7), the contact surface 3b approaches the contact surface 2b as much as possible, and the melted portion expands (FIG. 8). The heating element 4 is surrounded (FIG. 9). The state of FIG. 9 is a state in which the cover 3 is pressed against the case body 2 and closed, and this state is detected by the surface pressure detection unit 17 and a signal from this is input to the controller 18.

コントローラー１８は、サーボシリンダー１４の駆動を止め、同時に電圧制御部１３から電圧印加部１２を経由して抵抗発熱体４への電圧の印加を止める。   The controller 18 stops driving the servo cylinder 14 and simultaneously stops the voltage application from the voltage control unit 13 to the resistance heating element 4 via the voltage application unit 12.

この結果、当接面２ｂ、３ｂにおいて溶融した樹脂は急速に冷却し、やがて固化する（図１０）。   As a result, the resin melted on the contact surfaces 2b and 3b is rapidly cooled and solidified before long (FIG. 10).

この固化を待って、サーボシリンダー１４は初期設定の位置まで復帰し、次の熱溶着にそなえる。   Waiting for this solidification, the servo cylinder 14 returns to the initial position and is ready for the next thermal welding.

以上が、本発明における熱溶着工程である。なおコントローラー１８は、入力された当接面２ｂ、３ｂ（ケース本体２、カバー３）の樹脂の材質に合わせて電圧の印加値及びサーボシリンダー１４の駆動制御を演算し、以上に説明した各工程を自動的に制御する。   The above is the heat welding process in the present invention. The controller 18 calculates the voltage application value and the drive control of the servo cylinder 14 in accordance with the resin material of the input contact surfaces 2b and 3b (case body 2 and cover 3). Control automatically.

上記実施例において、熱溶着前のケース本体２及びカバー３は室温状態であるが、事前にこのケース本体２及びカバー３又は当接面２ｂ、３ｂをあらかじめ加熱しておくことにより、溶着時間の短縮を図ることもできる。   In the above embodiment, the case main body 2 and the cover 3 before heat welding are at room temperature, but the case main body 2 and the cover 3 or the contact surfaces 2b and 3b are heated in advance, so that the welding time can be reduced. It can also be shortened.

この予熱において、通常はケース本体２側の当接面２ｂの熱負荷はカバー３側のリブ３ａの先端である当接面３ｂに比較して大きいので、当接面２ｂ側のみに予熱をかけるようにしても良い。   In this preheating, the heat load on the contact surface 2b on the case body 2 side is usually larger than that on the contact surface 3b which is the tip of the rib 3a on the cover 3 side, so preheating is applied only to the contact surface 2b side. You may do it.

本発明は以上のように、熱溶着に移る前に抵抗発熱体４を当接面２ｂ、３ｂ間において位置決めを行っているため、溶着工程に移っても位置ずれが発生しないと共に抵抗発熱体４の線膨張は位置決めにより強制的に押えられることから、溶着強度の低下や水密、気密性能の低下は起らない。   In the present invention, as described above, the resistance heating element 4 is positioned between the contact surfaces 2b and 3b before moving to the thermal welding. Since the linear expansion is forcibly suppressed by positioning, there is no reduction in welding strength, watertightness or airtightness.

この性能のアップを位置決め工程を経ない従来の熱溶着方法図１１〜図１３と比較すると、抵抗発熱体４は熱溶着温度に達すると熱変形し、図１１から図１２に示すように当接面２ｂ、３ｂからずれて片寄り、溶融した樹脂ａは接合面２ｂ、３ｂから毛細管現象によりケース１の外に流出し、図１３に示すように極めて不体裁な状態となる。
図１４〜図１９を用いて各プロファイルの比較例を説明する。 Compared with the conventional heat welding method without the positioning step in FIGS. 11 to 13, the resistance heating element 4 is thermally deformed when it reaches the heat welding temperature, and comes into contact as shown in FIGS. 11 to 12. The resin a which has been displaced from the surfaces 2b and 3b and has melted out of the case 1 flows out of the case 1 by the capillary phenomenon from the joining surfaces 2b and 3b, and is in an extremely unnatural state as shown in FIG.
A comparative example of each profile will be described with reference to FIGS.

比較例Comparative example

図１４は本発明における抵抗発熱体４の温度プロファイルである。（A）は従来工法 （B）は本発明において溶着品を予熱しない場合、（C）は本発明において溶着品を１８０℃予熱した場合を示す。
図１５は本発明における圧力プロファイルである。（A）は従来工法 （B）は本発明において溶着品を予熱しない場合、（C）は本発明において溶着品を１８０℃予熱した場合を示す。
図１６は本発明における溶着電力プロファイルである。（A）は従来工法 （B）は本発明において溶着品を予熱しない場合、（C）は本発明において溶着品を１８０℃予熱した場合を示す。
図１７に溶着部の引っ張り強度比較例を示す。
図１８に本発明によるヘリウムリーク試験結果を示す。
図１９に従来工法と本発明予熱１８０℃における溶着部の溶融範囲を示す。この図１９において、符号の１９は従来工法における溶着部の溶融範囲、２０は本発明においてあらかじめ予熱１８０℃をかけたときの溶着部の溶融範囲である。 FIG. 14 is a temperature profile of the resistance heating element 4 in the present invention. (A) shows the conventional method (B) shows the case where the welded product is not preheated in the present invention, and (C) shows the case where the welded product is preheated at 180 ° C. in the present invention.
FIG. 15 is a pressure profile in the present invention. (A) shows the conventional method (B) shows the case where the welded product is not preheated in the present invention, and (C) shows the case where the welded product is preheated at 180 ° C. in the present invention.
FIG. 16 is a welding power profile in the present invention. (A) shows the conventional method (B) shows the case where the welded product is not preheated in the present invention, and (C) shows the case where the welded product is preheated at 180 ° C. in the present invention.
FIG. 17 shows a comparative example of the tensile strength of the welded portion.
FIG. 18 shows a helium leak test result according to the present invention.
FIG. 19 shows the melting range of the welded part in the conventional method and the present invention preheating at 180 ° C. In FIG. 19, reference numeral 19 denotes a melting range of the welded portion in the conventional method, and 20 denotes a melted range of the welded portion when preheating 180 ° C. is applied in advance in the present invention.

上記した各比較例のデータを次に示す。
比較条件
樹脂 PPS+GF40％ グレード DIC FZ-2140
軟化温度 ２６５℃ 溶融温度 ２８０℃
溶着部長さ 周長 ６００ｍｍ
抵抗発熱体 材質 SUS３０４
寸法 φ１．５ 周長 ７２０mm
溶着条件 溶着温度 ３００〜４００℃
押圧力 従来工法 ５０００N
押圧力 本発明 ２５００N〜５０００N 可変
溶着部の引っ張り強度 図１７
使用機器 島津製作所AG-5KNI 引っ張り試験機
テストピース 各N=９ L=１０ｍｍ
従来工法 １５０〜１９０N 平均１７０N
本発明 予熱無し ２３０〜２７０N 平均２５０N
本発明 予熱１８０℃ ２９０〜３４０N 平均３１５N
密封性 図１８
熱溶着後の被試験体に冷熱衝撃（−３５℃ 〜 １００℃）各６０分
２０サイクル後ヘリウムガスを０．１６Ｍｐａ注入後、５分間放置し、
リーク量が０．１５ｃｃ/分以下であること
使用機器 マスフローメータ（流量指示計）
テストピース N=９
従来工法 合格 ０％ （全数リーク多量）
本発明による 合格 １００％ The data of each comparative example described above is shown below.
Comparison conditions Resin PPS + GF40% Grade DIC FZ-2140
Softening temperature 265 ° C Melting temperature 280 ° C
Welded part length Perimeter 600mm
Resistance heating element Material SUS304
Dimensions φ1.5 circumference 720mm
Welding conditions Welding temperature 300-400 ° C
Pressing force Conventional method 5000N
Pressing force of the present invention 2500N to 5000N variable Tensile strength of welded portion Fig. 17
Equipment used Shimadzu AG-5KNI tensile testing machine
Each test piece N = 9 L = 10mm
Conventional method 150-190N Average 170N
The present invention No preheating 230-270N Average 250N
The present invention Preheating 180 ° C. 290-340N Average 315N
Sealability FIG.
Cold shock (-35 ° C. to 100 ° C.) 60 minutes each on the test specimen after heat welding
After 20 cycles, 0.16 Mpa of helium gas was injected and left for 5 minutes.
Leak rate is 0.15cc / min or less
Equipment used Mass flow meter (flow indicator)
Test piece N = 9
Conventional method passed 0% (all leaks are large)
100% acceptance according to the present invention

発明によれば、溶着部の樹脂が軟化変形状態の第一工程から、溶融状態に変化した時点で成形品の変位を検知する事により溶着部への押圧力を第一工程に比して可変弱くなるように制御する第二工程によって、従来工法では溶融状態においても押圧一定のため、ナイロンやＰＰＳ樹脂など溶融温度が２８０℃以上と高い場合、溶着部加熱の微妙なばらつきにより、先に溶融温度に達した樹脂の粘性が一気に低下して流出し、添加物であるガラスフィラーだけが残ってしまう現象が発生したが、溶着部への押圧力を第一工程に比して可変弱くなるように制御することにより、発熱抵抗体周囲の溶融樹脂部分を５０μ〜１００μを確保しつつ、所望する位置まで溶着を進行させ、これにより、溶融樹脂の流出を防ぐ事が可能となった。 According to the invention, the pressing force to the welded portion is variable compared to the first step by detecting the displacement of the molded product when the resin in the welded portion changes from the softened and deformed state to the molten state. the second step is controlled to be weak, for even pressing constant in the molten state in the conventional method, when the melting temperature nylon or PPS resin is 280 ° C. or higher and high, by subtle variations in the welded portion heated, melted earlier flows decreases the viscosity of the resin reaches a temperature at once, but the glass filler is additive remains, thus occurs, so that the variable becomes weaker than the pressing force to the welded portion in the first step By controlling the thickness of the molten resin, it is possible to proceed the welding to a desired position while securing 50 μ to 100 μm around the molten resin portion , thereby preventing the molten resin from flowing out.

第三工程では、溶着部分が密着した状態で押圧力をさらに可変制御して、成形品同士の距離を一定に保持した状態で溶着部の溶融を促進する事により、溶着面全体が溶融温度に達すまで加熱を継続する。   In the third step, the entire welding surface is brought to the melting temperature by further controlling the pressing force in a state where the welded portions are in close contact, and promoting the melting of the welded portion while keeping the distance between the molded products constant. Continue heating until it reaches.

このため、溶着部温度のばらつきによる溶融不足や過熱によるボイドの発生が抑制され安定した溶着が可能となった。   For this reason, insufficient melting due to variations in weld temperature and generation of voids due to overheating are suppressed, and stable welding becomes possible.

第四工程においては溶着面が完全に溶融後、成形品の変位が無いよう押圧を制御しながら冷却をおこなうため、溶着加工後の溶着面はがれや溶着部の寸法変化を防止する効果がある。   In the fourth step, after the welding surface is completely melted, cooling is performed while controlling the pressure so that there is no displacement of the molded product, so that the welding surface after the welding process has an effect of preventing peeling and dimensional change of the welded portion.

この工法により、図１７に示すように従来工法に比べて溶着強度が４７％向上した。   As shown in FIG. 17, this method improved the welding strength by 47% compared to the conventional method.

本事例では抵抗発熱体４に断面円形のものを示したが、抵抗発熱体４の断面形状は円形にこだわらず、楕円あるいは多角形においても同様の効果が期待できる。   In this example, the resistance heating element 4 has a circular cross section. However, the resistance heating element 4 is not limited to a circular cross section, and the same effect can be expected even in an ellipse or a polygon.

図１４によれば、予熱無しの場合（B）加熱完了まで170秒であるが双方の溶着品を１８０℃まで予熱した場合（C）加熱完了まで１３５秒で完了し、約２０％の時間が短縮できた。また成形品全体が熱変形温度に、より近い状態から溶着を行うため、抵抗発熱体４の発熱が溶着部以外への拡散が最小限となり、前記抵抗発熱体４周囲の溶融樹脂量が予熱無しに比べて５０％増加した。   According to FIG. 14, in the case of no preheating (B) 170 seconds until completion of heating, but in the case where both welded products are preheated to 180 ° C. (C) The completion of heating is completed in 135 seconds, and the time of about 20% It was shortened. In addition, since the entire molded product is welded from a state closer to the heat distortion temperature, the heat generated by the resistance heating element 4 is minimally diffused outside the welded portion, and the amount of molten resin around the resistance heating element 4 is not preheated. Increased by 50%.

この結果、溶融部の温度差が少なく、安定した樹脂の溶融が進行し、添加されたガラスフィラーが偏ることや、樹脂の過加熱による分解や劣化が無くなり、図１７に示すように予熱無しに比べて請求項１の発明に比べて溶着強度がさらに２６％向上した。   As a result, the temperature difference in the melted portion is small, stable melting of the resin proceeds, the added glass filler is biased, and there is no decomposition or deterioration due to overheating of the resin, as shown in FIG. 17, without preheating. Compared to the invention of claim 1, the welding strength was further improved by 26%.

図１９には従来工法と本発明で成形品を予熱１８０℃で溶着した溶着部における溶融範囲を示す。従来工法では抵抗発熱体４の下側の溶融部１９は１０〜２０μである事が顕微鏡観察で確認できたのに対し、本発明で成形品を予熱１８０℃とした場合は溶融部２０が３０〜５０μに拡大していることから、溶着強度が更に上がった事が裏付けられた。さらに、溶融部のガラスフィラーが均一に配置されている事も確認され、冷熱衝撃試験後の密封性が確保されていることが確認できた。   FIG. 19 shows the melting range in the welded part where the molded product was welded at 180 ° C. with the conventional method and the present invention. In the conventional method, it was confirmed by microscopic observation that the melted portion 19 on the lower side of the resistance heating element 4 was 10 to 20 μm, whereas when the molded product was preheated at 180 ° C. in the present invention, the melted portion 20 was 30. The fact that the weld strength was further increased was confirmed by the fact that it was enlarged to ˜50 μm. Furthermore, it was also confirmed that the glass filler in the molten part was uniformly arranged, and it was confirmed that the sealing performance after the thermal shock test was secured.

本発明では、熱可塑性樹脂で成形された成形品同士の熱溶着において、接合される成形品の変位量を位置計測センサー１６で計測しながらサーボシリンダー１４を制御することにより、前記変位量により接合面２ｂ、３ｂの溶融状態に合わせた押圧可変制御を行い、接合面樹脂の過熱溶融や流出を防止し、さらに接合面２ｂ、３ｂが密着した状態を保持するように押圧力を可変制御して溶着部の溶融を促進し、接合面２ｂ、３ｂの溶融が所望する範囲に確実に達するように制御した。この結果過溶融による樹脂の分解やボイドの発生、加熱不足による未溶融部の発生が無くなり、安定した溶着強度と溶着部の気密性を確保することができた。   In the present invention, in the thermal welding of molded products molded with a thermoplastic resin, the servo cylinder 14 is controlled while measuring the displacement amount of the molded product to be joined by the position measurement sensor 16, so that the joining is performed according to the displacement amount. Perform variable pressure control according to the melted state of the surfaces 2b and 3b, prevent overheating and outflow of the bonding surface resin, and further variably control the pressing force so that the bonded surfaces 2b and 3b are kept in close contact with each other. Control was performed so as to promote melting of the welded portion and surely reach the desired range of melting of the joining surfaces 2b and 3b. As a result, decomposition of the resin due to overmelting, generation of voids, and generation of unmelted portions due to insufficient heating were eliminated, and stable welding strength and hermeticity of the welded portions could be secured.

１ ケース
２ ケース本体
２ｂ 当接面
３ カバー
３ｂ 当接面
４ 抵抗発熱体
１０ ベース
１２ 電圧印加部
１４ サーボシリンダー
１８ コントローラー DESCRIPTION OF SYMBOLS 1 Case 2 Case main body 2b Contact surface 3 Cover 3b Contact surface 4 Resistance heating element 10 Base 12 Voltage application part 14 Servo cylinder 18 Controller

Claims (1)

ａ．熱可塑性樹脂で成形された成形品同士の接合面に抵抗発熱体を挟み込み、この抵抗発熱体に電圧を印加して発熱させることにより接合面の溶融を図り、更に接合面間に面圧 をかけて接合面同士を熱溶着する方法において、
ｂ．接合面の熱負荷に大小の違いがある場合には熱負荷の大きい側のみ、又は熱負荷の大小を問わずその双方に予熱をかける第一工程、
ｃ．次に、前記抵抗発熱体に印加して発熱させる電圧を前記接合面が軟化する温度に制御し ながら接合面間の距離を一定のところまで接近させて抵抗発熱体の外形の一部を接合面 の双方に喰い込ませる第二工程、
ｄ．次に、前記抵抗発熱体に対する電圧の印加を接合面の溶融温度以上となるように制御 しながら更に接合面に面圧をかけて互いの接合面を溶融し、熱溶着する第三工程、
ｅ．から成る熱可塑性樹脂成形品の熱溶着方法。 a. A resistance heating element is sandwiched between the joint surfaces of molded products made of thermoplastic resin, and a voltage is applied to the resistance heating element to generate heat, thereby melting the joint surfaces and further applying a surface pressure between the joint surfaces. In the method of thermally welding the joint surfaces together,
b. When there is a difference in the thermal load on the joint surface, only the side with the large thermal load, or the first step of preheating both the thermal load regardless of the size,
c. Next, while controlling the voltage to be applied to the resistance heating element to generate heat and controlling the temperature at which the bonding surface is softened, the distance between the bonding surfaces is brought close to a certain point so that a part of the outer shape of the resistance heating element is bonded to the bonding surface. The second process to eat both
d. Next, a third step is performed in which the application of voltage to the resistance heating element is controlled to be equal to or higher than the melting temperature of the bonding surface, and the bonding surface is further subjected to surface pressure to melt and heat-bond each other.
e. A method for thermally welding a thermoplastic resin molded article comprising:
JP2009288931A 2009-12-21 2009-12-21 Thermal welding method for thermoplastic resin molded products Expired - Fee Related JP5489214B2 (en)

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