JP2010253859A - Resin welding method and bathroom electric apparatus formed by the method - Google Patents

Resin welding method and bathroom electric apparatus formed by the method Download PDF

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Publication number
JP2010253859A
JP2010253859A JP2009108572A JP2009108572A JP2010253859A JP 2010253859 A JP2010253859 A JP 2010253859A JP 2009108572 A JP2009108572 A JP 2009108572A JP 2009108572 A JP2009108572 A JP 2009108572A JP 2010253859 A JP2010253859 A JP 2010253859A
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Prior art keywords
resin
resin material
laser beam
welding
laser light
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JP2009108572A
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Japanese (ja)
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JP5229091B2 (en
Inventor
Minoru Ikuta
稔 生田
Tokuyuki Kuribayashi
徳幸 栗林
Yuta Tsuji
佑太 辻
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Noritz Corp
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Noritz Corp
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Publication of JP2010253859A publication Critical patent/JP2010253859A/en
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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
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • 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
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one 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
    • 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
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B29C65/1658—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning once, e.g. contour laser welding
    • 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
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/028—Non-mechanical surface pre-treatments, i.e. by flame treatment, electric discharge treatment, plasma treatment, wave energy or particle radiation
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • 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
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2424—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24243—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral
    • B29C66/24244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/305—Decorative or coloured 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said 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
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/61—Joining from or joining on the inside
    • 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
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    • B29C66/65—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 with a relative motion between the article and the welding tool
    • 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
    • B29C66/65—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 with a relative motion between the article and the welding tool
    • B29C66/652—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 with a relative motion between the article and the welding tool moving the welding tool around the fixed article
    • 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
    • B29C66/733—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7332—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being coloured
    • 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
    • B29C66/733—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7336—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
    • B29C66/73365—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 optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
    • 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
    • B29C66/70—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
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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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
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/168—Laser beams making use of an absorber or impact modifier placed at the interface
    • 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
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/1683—Laser beams making use of an absorber or impact modifier coated on the article
    • 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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • B29K2995/0027—Transparent for light outside the visible spectrum

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Thermal Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin welding method by which laser welding is surely carried out at low cost without requiring additional parts even though one of two resin materials to be welded includes low laser beam absorbing rate and reflects the most part of the laser beam. <P>SOLUTION: A burned part is formed as an absorbing part 22 by irradiating a surface 21 of a second white resin material 2 in which laser beam reflecting property wins laser beam absorbing property (an absorbing part forming step PA1) with a pulse laser beam Rp. A welded part 23 is formed by melting the resin material near the absorbing part by heating the absorbing part by irradiating with a continuous laser beam Rc from the side of a first resin material while superposing the first translucent resin material 1 having laser beam transmitting property (a superposing step PA2). Thereby, the body and lid of a bathroom remote controller is laser-welded to provide the watertight structure easily. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、レーザ光を照射することにより、熱可塑性の第１の樹脂材と第２の樹脂材とを互いに溶着するための樹脂溶着方法及びその方法により形成される浴室電気機器に関し、特に一方の樹脂材をレーザ光が透過するものとし、このレーザ光透過側の樹脂材の側からレーザ光を照射することにより両樹脂材の境界面に溶着部を形成させるというレーザ溶着技術に係る。   The present invention relates to a resin welding method for welding a thermoplastic first resin material and a second resin material to each other by irradiating a laser beam, and a bathroom electrical device formed by the method. This laser material transmits a laser beam from the resin material side on the laser beam transmission side, and a laser beam is irradiated from the resin material side to form a welded portion at the boundary surface between the two resin materials.

従来、レーザ光を利用した樹脂溶着方法として、熱可塑性の２枚の樹脂材を重ね合わせて溶着させる場合、一方の樹脂材をレーザ光が透過する透過性を有するもので構成し、他方の樹脂材をレーザ光を吸収して発熱するという吸収性を有するもので構成し、透過性の樹脂材の側（透過側の樹脂材）からレーザ光を照射することで境界面で両者を溶着させるというレーザ透過溶着法が知られている（例えば特許文献１参照）。   Conventionally, as a resin welding method using laser light, when two thermoplastic resin materials are overlapped and welded, one resin material is made of a material having a permeability to transmit laser light, and the other resin is used. The material is made of a material that absorbs laser light and generates heat, and the laser light is irradiated from the side of the transparent resin material (the resin material on the transmission side) to weld both at the boundary surface. A laser transmission welding method is known (see, for example, Patent Document 1).

その際、熱可塑性の境界面に吸収体を介在させることも知られている。すなわち、レーザ光を吸収して発熱しそれ自体が溶融するという吸収体を境界面に介在させた状態で、透過側の樹脂材からレーザ光を照射することで吸収体を溶融させて２枚の樹脂材を互いに溶着させるというものである（例えば特許文献１又は特許文献２参照）。   In that case, it is also known to interpose an absorber on the thermoplastic interface. That is, in the state where an absorber that absorbs laser light and generates heat and melts itself is interposed at the boundary surface, the absorber is melted by irradiating laser light from the resin material on the transmission side. The resin materials are welded to each other (see, for example, Patent Document 1 or Patent Document 2).

特公平５−４２３３６号公報Japanese Patent Publication No. 5-42336 特開２００６−１９８０７４号公報JP 2006-198074 A

ここで、溶着させる一方の樹脂材が透過性を有するものであり、他方の樹脂材がレーザ光の照射を受けても大半を反射し殆ど吸収しないようなもの（例えば白色系の樹脂材）である場合には、レーザ光透過側の樹脂材の側からレーザ光を照射しても、境界面で反射されてしまい、その境界面での溶着は困難又は不能となる。   Here, one of the resin materials to be welded has transparency, and the other resin material is such that it reflects most and hardly absorbs even when irradiated with laser light (for example, white resin material). In some cases, even if the laser beam is irradiated from the resin material side on the laser beam transmitting side, it is reflected at the boundary surface, and welding at the boundary surface becomes difficult or impossible.

このため、このような樹脂材の組み合わせの場合には、上記の一方の樹脂材と他方の樹脂材との境界面に対し、レーザ光を吸収して発熱する何らかの他の吸収媒体を介装させる必要が生じる。この対策としては、例えば図７（ａ）に示すように、上記他方の樹脂材２００の境界面となる側の表面にレーザ光の吸収剤を含有する塗料又はインク２０１を塗布したり、あるいは、図７（ｂ）に示すように上記吸収剤を含有する他の樹脂板又は樹脂フィルム２０２を貼り付けて挟み込んだりすることが考えられる。つまり、上記の吸収媒体として、インク２０１又は樹脂フィルム２０２を追加するのである。   For this reason, in the case of such a combination of resin materials, some other absorption medium that absorbs laser light and generates heat is interposed at the boundary surface between the one resin material and the other resin material. Need arises. As a countermeasure, for example, as shown in FIG. 7A, a paint or ink 201 containing a laser beam absorber is applied to the surface of the other resin material 200 on the side, or As shown in FIG. 7B, it is conceivable that another resin plate or resin film 202 containing the absorbent is attached and sandwiched. That is, the ink 201 or the resin film 202 is added as the absorbing medium.

しかしながら、このような吸収媒体の塗布又は貼り付けを行うには、溶着対象とは別部品(追加部品)として吸収媒体が必要になる上に、その塗布又は貼り付けのための工程・工数（追加の工程・工数）が必要になる。このことは、製造コストの増大や、部品管理・品質管理の対象増大に伴う手間の増大というような品質安定性維持のための手間の増大等を招くことにつながる。   However, in order to apply or paste such an absorbing medium, the absorbing medium is required as a separate part (additional part) from the object to be welded, and the process and man-hours (additional) for applying or pasting the absorbing medium Process and man-hour). This leads to an increase in manufacturing costs and an increase in labor for maintaining quality stability, such as an increase in labor associated with an increase in parts management / quality control targets.

本発明は、このような事情に鑑みてなされたものであり、その目的とするところは、溶着対象の２つの樹脂材の内の一つがレーザ光吸収率が低くレーザ光の大半を反射してしまうようなものであっても、追加部品等を必要とすることなく低コストで確実にレーザ溶着し得る樹脂溶着方法を提供することにある。加えて、このような樹脂溶着方法を用いて外装ケースを低コストにかつ確実に水密状態に溶着した浴室電気機器を提供することも目的とする。   The present invention has been made in view of such circumstances, and the object of the present invention is to reflect one of the two resin materials to be welded having a low laser light absorption rate and reflecting most of the laser light. Accordingly, it is an object of the present invention to provide a resin welding method capable of reliably performing laser welding at low cost without requiring additional parts. In addition, another object of the present invention is to provide a bathroom electrical device in which the exterior case is reliably welded in a watertight state at low cost using such a resin welding method.

上記目的を達成するために、樹脂溶着方法に係る発明では、共に熱可塑性樹脂であって、レーザ光を透過させるレーザ光透過性の第１の樹脂材と、レーザ光を吸収するレーザ光吸収性よりもレーザ光を反射させるレーザ光反射性が勝る第２の樹脂材とを互いに当接するよう重ね合わせ、第１の樹脂材の側からレーザ光を照射させることにより第１及び第２の両樹脂材間の当接境界面において溶着部を形成させる樹脂溶着方法を対象にして次の特定事項を備えるようにした。すなわち、レーザ光の照射により溶着部を形成するための溶着工程を行う前に、上記当接境界面に対応する第２の樹脂材の面に対しレーザ光を照射することにより高レーザ光吸収性を有する濃色部分を吸収部として形成する吸収部形成工程を行うようにすることとした（請求項１）。   In order to achieve the above object, in the invention relating to the resin welding method, a first resin material that is both a thermoplastic resin and transmits laser light, and a laser light absorption property that absorbs laser light. The first resin material and the second resin material are arranged so as to contact each other with the second resin material that reflects the laser light more than the second resin material, and both the first and second resins are irradiated from the first resin material side. The following specific matters are provided for a resin welding method in which a welded portion is formed at the contact boundary surface between materials. That is, before performing the welding process for forming the welded portion by laser light irradiation, high laser light absorption is achieved by irradiating the surface of the second resin material corresponding to the contact boundary surface with the laser light. An absorption part forming step of forming a dark color part having a light absorption part as an absorption part is performed (claim 1).

この発明の場合、吸収部形成工程におけるレーザ光照射により第２の樹脂材の面に例えば焦げ部分として黒色又は黒色系の濃色部分が形成され、濃色部分である吸収部の存在により、後の溶着工程で照射されるレーザ光を吸収して発熱し、周囲の樹脂材を溶融させて第１及び第２の両樹脂材の当接境界面に溶着部を確実に形成することができるようになる。これにより、従来の対策としてのインク塗布や樹脂フィルムの貼り付け等の追加部品を必要とすることなく、容易にかつ確実にしかも低コストでレーザ溶着を実現させ得ることになる。   In the case of the present invention, a black or black dark portion is formed on the surface of the second resin material, for example, as a burned portion on the surface of the second resin material by the laser beam irradiation in the absorbing portion forming step. The laser beam irradiated in the welding process is absorbed to generate heat, and the surrounding resin material is melted so that the welded portion can be reliably formed at the contact boundary surface between the first and second resin materials. become. As a result, laser welding can be realized easily and reliably and at low cost without requiring additional parts such as ink application and resin film pasting as conventional countermeasures.

この発明においては、上記吸収部形成工程を第２の樹脂材に対して行った後に、吸収部が形成された第２の樹脂材に上記第１の樹脂材を重ね合わせ、重ね合わせた状態の第１の樹脂材の側からレーザ光を照射することにより溶着工程を行うようにするという樹脂溶着方法を採用するようにすることができる（請求項２）。この場合には、第２の樹脂材に対する吸収部の形成を第２の樹脂材単独の状態で行うことができ、吸収部の形成の確実性を高め得る一方、第１の樹脂材として溶着工程でのレーザ光が透過可能であれば全て適用可能とし得る。   In this invention, after performing the absorption part forming step on the second resin material, the first resin material is overlaid on the second resin material on which the absorption part is formed, It is possible to adopt a resin welding method in which the welding process is performed by irradiating laser light from the first resin material side (claim 2). In this case, the absorption part can be formed on the second resin material in the state of the second resin material alone, and the reliability of the formation of the absorption part can be improved, while the welding process as the first resin material. Any laser beam can be applied as long as it can pass through.

あるいは、上記発明において、上記吸収部形成工程を、第１及び第２の両樹脂材を互いに重ね合わせた後に、その重ね合わせた状態でレーザ光を第１の樹脂材の側から照射することにより行うようにするという樹脂溶着方法を採用することができる（請求項３）。この場合には、最初から第１及び第２の両樹脂材を重ね合わせた状態のままで、吸収部形成工程と溶着工程とを連続して実行可能となり、レーザ溶着のための加工効率を最大限に高め得ることになる。   Alternatively, in the above invention, after the first and second resin materials are overlapped with each other in the absorbing portion forming step, laser light is irradiated from the first resin material side in the overlapped state. It is possible to adopt a resin welding method in which it is performed (Claim 3). In this case, the absorption part forming step and the welding step can be continuously performed while the first and second resin materials are overlapped from the beginning, thereby maximizing the processing efficiency for laser welding. It can be raised to the limit.

以上の樹脂溶着方法において上記吸収部形成工程で照射するレーザ光としてパルスレーザ光を用いるようにすることができる（請求項４）。パルスレーザ光を用いることで、樹脂材の発泡の発生を防止しつつも、パルス発振によるパルスレーザ光により吸収部の形成を効果的に行い得るようになる。   In the above resin welding method, a pulsed laser beam can be used as the laser beam irradiated in the absorption part forming step. By using the pulse laser beam, it is possible to effectively form the absorbing portion by the pulse laser beam by pulse oscillation while preventing the resin material from foaming.

以上の樹脂溶着方法により形成される浴室電気機器に係る発明では、外装ケースが少なくとも２つの部材を接合させることにより組み立てられる浴室電気機器を対象にして次の特定事項を備えるようにした。すなわち、上記外装ケースを構成する上記少なくとも２つの部材の接合部を請求項１〜請求項４のいずれかに記載の樹脂溶着方法により互いに溶着させて上記外装ケースとして水密構造を備えるものに形成することとする（請求項５）。   In the invention relating to the bathroom electrical device formed by the above-described resin welding method, the exterior case includes the following specific matters for the bathroom electrical device assembled by joining at least two members. That is, the joint part of the said at least 2 member which comprises the said exterior case is welded mutually by the resin welding method in any one of Claims 1-4, and it forms in what has a watertight structure as said exterior case. (Claim 5).

この発明の場合、水密構造の浴室電気機器を構成するためにレーザ溶着を適用する上で、請求項１〜請求項４のいずれかに記載の樹脂溶着方法を用いて容易かつ確実に水密構造とすることが可能となると共に、それを低コストで実現させ得ることになる。   In the case of this invention, when laser welding is applied to constitute a bathroom electrical appliance having a watertight structure, the watertight structure can be easily and reliably obtained using the resin welding method according to any one of claims 1 to 4. And it can be realized at a low cost.

以上、説明したように、請求項１〜請求項４のいずれかに記載の樹脂溶着方法によれば、吸収部形成工程におけるレーザ光照射により第２の樹脂材の面に例えば焦げ部分として黒色又は黒色系の濃色部分を形成することができ、濃色部分である吸収部の存在により、後の溶着工程で照射されるレーザ光を吸収して発熱し、周囲の樹脂材を溶融させて第１及び第２の両樹脂材の当接境界面に溶着部を確実に形成することができるようになる。これにより、溶着対象の２つの樹脂材の内の一つがレーザ光吸収率が低くレーザ光の大半を反射してしまうようなものであっても、従来の対策としてのインク塗布や樹脂フィルムの貼り付け等の追加部品を必要とすることなく、容易にかつ確実にしかも低コストでレーザ溶着を実現させることができるようになる。   As described above, according to the resin welding method according to any one of claims 1 to 4, the surface of the second resin material is blackened as, for example, a burnt portion by laser light irradiation in the absorption portion forming step. A black-colored dark portion can be formed, and the presence of the absorbing portion, which is a dark-colored portion, absorbs the laser beam irradiated in the subsequent welding process and generates heat, and the surrounding resin material is melted. A welded portion can be reliably formed on the contact boundary surface between the first and second resin materials. As a result, even if one of the two resin materials to be welded has a low laser beam absorptivity and reflects most of the laser beam, conventional methods such as ink application and resin film application Laser welding can be realized easily and reliably and at low cost without requiring additional parts such as attachment.

特に請求項２によれば、第２の樹脂材に対する吸収部の形成を第２の樹脂材単独の状態で行うことができ、吸収部の形成の確実性を高めることができる一方、第１の樹脂材として溶着工程でのレーザ光が透過可能であれば全て適用可能であり、その適用可能範囲を広げることができるようになる。   In particular, according to the second aspect, it is possible to form the absorbing portion with respect to the second resin material in a state of the second resin material alone, and it is possible to improve the certainty of forming the absorbing portion. Any resin material that can transmit laser light in the welding process can be applied, and the applicable range can be expanded.

請求項３によれば、最初から第１及び第２の両樹脂材を重ね合わせた状態のままで、吸収部形成工程と溶着工程とを連続して実行させることができるようになり、レーザ溶着のための加工効率を最大限に高めることができるようになる。   According to claim 3, it is possible to continuously perform the absorption part forming step and the welding step while the first and second resin materials are overlapped from the beginning, and laser welding is performed. It will be possible to maximize the processing efficiency for.

請求項４によれば、吸収部形成工程で照射するレーザ光としてパルスレーザ光を用いることで、樹脂材の発泡の発生を防止しつつも、パルス発振によるパルスレーザ光により吸収部の形成を効果的に行うことができるようになる。   According to claim 4, by using pulsed laser light as the laser light to be irradiated in the absorption part forming step, it is possible to effectively form the absorption part by pulsed laser light by pulse oscillation while preventing foaming of the resin material. Can be done automatically.

請求項５の浴室電気機器によれば、水密構造の浴室電気機器を構成するためにレーザ溶着を適用する上で、請求項１〜請求項４のいずれかに記載の樹脂溶着方法を用いることで、容易かつ確実に水密構造とすることができると共に、それを低コストで実現させることができるようになる。   According to the bathroom electrical equipment of claim 5, when applying laser welding to constitute a bathroom electrical equipment having a watertight structure, the resin welding method according to any one of claims 1 to 4 is used. Thus, the watertight structure can be easily and surely realized, and it can be realized at low cost.

本発明の第１実施形態を示す説明図である。It is explanatory drawing which shows 1st Embodiment of this invention. 図２（ａ）は吸収部形成工程における拡大断面説明図であり、図２（ｂ）は溶着工程における拡大断面説明図である。FIG. 2A is an enlarged cross-sectional explanatory view in the absorption part forming step, and FIG. 2B is an enlarged cross-sectional explanatory view in the welding step. 第２実施形態を示す図１対応図である。It is a figure corresponding to FIG. 1 which shows 2nd Embodiment. 浴室電気機器の蓋を溶着する前の外装ケースの本体を斜視図及び断面図の状態で示す説明図である。It is explanatory drawing which shows the main body of the exterior case before welding the lid | cover of bathroom electrical equipment in the state of a perspective view and sectional drawing. 図４の本体に対し蓋を溶着した状態の外装ケースを斜視図及び断面図の状態で示す説明図である。It is explanatory drawing which shows the exterior case of the state which welded the lid | cover with respect to the main body of FIG. 4 in the state of a perspective view and sectional drawing. 実施例と比較例１，２との溶着強度についての試験結果を示す表である。It is a table | surface which shows the test result about the welding strength of an Example and Comparative Examples 1 and 2. FIG. 従来の樹脂溶着方法における対策例を示し、図７（ａ）は塗料又はインクを塗布する例を示す斜視図であり、図７（ｂ）は樹脂板又は樹脂フィルムを貼り付ける例を示す斜視図である。FIG. 7A is a perspective view showing an example of applying a paint or ink, and FIG. 7B is a perspective view showing an example of attaching a resin plate or a resin film. It is.

以下、本発明の実施形態を図面に基づいて説明する。本発明の樹脂溶着方法は、共に熱可塑性を有する第１の樹脂材と第２の樹脂材とを溶着させるために、レーザ光を用いた吸収部形成工程と、レーザ光を用いた溶着工程とを基本工程として備えたものであり、吸収部形成工程を第２の樹脂材単独で実行する第１実施形態と、吸収部形成工程を第１及び第２の両樹脂材を重ね合わせた状態で実行する第２実施形態とに分かれる。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. The resin welding method of the present invention includes an absorption part forming step using laser light and a welding step using laser light in order to weld the first resin material and the second resin material both having thermoplasticity. In the state where the first and second resin materials are overlapped with the first embodiment in which the absorbing portion forming step is executed by the second resin material alone. This is divided into the second embodiment to be executed.

＜第１実施形態＞
図１は、本発明の第１実施形態に係る樹脂溶着方法の工程図と各工程における樹脂材の状態を示すものである。第１実施形態の樹脂溶着方法は、第２の樹脂材２の表面（境界面となる側の表面）２１に対し吸収部２２を形成する吸収部形成工程ＰＡ１と、吸収部２２が形成された第２の樹脂材２に対し第１の樹脂材１を重ね合わせる重ね合わせ工程ＰＡ２と、重ね合わさせた第１及び第２の両樹脂材１，２を互いに溶着させる溶着工程ＰＡ３とを備えている。 <First Embodiment>
FIG. 1 shows a process diagram of a resin welding method according to a first embodiment of the present invention and a state of a resin material in each process. In the resin welding method of the first embodiment, the absorption part forming step PA1 for forming the absorption part 22 with respect to the surface (surface on the side serving as the boundary surface) 21 of the second resin material 2 and the absorption part 22 are formed. A superposition process PA2 for superposing the first resin material 1 on the second resin material 2 and a welding process PA3 for welding the superposed first and second resin materials 1 and 2 to each other are provided. .

第１実施形態の樹脂溶着方法の対象となる第１の樹脂材１は、レーザ光を透過させる透過性を有するものであり、透明（着色透明を含む）のみならず半透明（無着色）の樹脂材をも含むものである。無着色半透明の樹脂材としては、着色剤を添加しない自然色（例えば薄い黄色）のものも含まれる。要するに、第１実施形態においては、第１の樹脂材１の透過性として、溶着工程ＰＡ３において溶着用のレーザ光が目的の溶着を実現させ得る程度に透過可能であればよく、透過率が例えば５０％以上程度あればよい。一方、第２の樹脂材２は、レーザ光を殆ど吸収せずに大半を反射してしまうというような反射性を有するものであり、着色剤が添加されて不透明に構成された樹脂材により構成される。特に白色系の着色剤が添加された白色系樹脂材がこのような反射性を有している。このような第１及び第２の樹脂材１，２の各特性は第２実施形態においても同様である。   The 1st resin material 1 used as the object of the resin welding method of 1st Embodiment has the transparency which permeate | transmits a laser beam, and is not only transparent (a colored transparent is included) but translucent (uncolored). A resin material is also included. The non-colored translucent resin material includes a natural color (for example, light yellow) that does not contain a colorant. In short, in the first embodiment, as long as the permeability of the first resin material 1 is sufficient as long as the laser beam for welding in the welding step PA3 can transmit the target welding, the transmittance is, for example, It may be about 50% or more. On the other hand, the second resin material 2 has reflectivity such that most of the laser beam is reflected without absorbing the laser beam, and the second resin material 2 is made of an opaque resin material added with a colorant. Is done. In particular, a white resin material to which a white colorant is added has such reflectivity. The characteristics of the first and second resin materials 1 and 2 are the same in the second embodiment.

溶着ラインには、吸収部形成工程ＰＡ１を実行する吸収部形成ユニット３と、溶着工程ＰＡ３を実行する溶着ユニット４とが設置されている。吸収部形成ユニット３は、吸収部２２を形成するためのレーザ光としてパルスレーザ光を出射させるレーザ装置３１と、レーザ光の照射対象である第２の樹脂材２を所定位置に固定する固定台装置３２とを備えたものである。又、溶着ユニット４は、重ね合わされた第１及び第２の樹脂材１，２の第１の樹脂材１の上から上記の吸収部２２に向けて溶着用の連続レーザ光を出射させるレーザ装置４１と、レーザ光の照射対象である台及び第２の樹脂材１，２を所定位置に固定する固定台装置４２とを備えている。なお、レーザ装置３１と固定台装置３２のいずれか一方又は双方、あるいは、レーザ装置４１と固定台装置４２のいずれか一方又は双方が、平面方向（Ｘ−Ｙ方向）に対し相対移動調節可能となっている。このために、固定台装置３２，４２としては、それぞれ平面方向（Ｘ−Ｙ方向）に移動可能な移動テーブルを付設したもので構成してもよい。又、特に上記のレーザ装置３１としてはＸ−Ｙ−Ｚの三軸方向への移動調節可能となったものが好ましい。   In the welding line, an absorption part forming unit 3 for executing the absorption part forming process PA1 and a welding unit 4 for executing the welding process PA3 are installed. The absorption unit forming unit 3 includes a laser device 31 that emits a pulsed laser beam as a laser beam for forming the absorption unit 22, and a fixed base that fixes the second resin material 2 to be irradiated with the laser beam at a predetermined position. The apparatus 32 is provided. Further, the welding unit 4 is a laser device that emits continuous laser light for welding from above the first resin material 1 of the first and second resin materials 1 and 2 superimposed on each other toward the absorbing portion 22. 41 and a base that is a target of laser light irradiation and a fixing base device 42 that fixes the second resin materials 1 and 2 at predetermined positions. Note that one or both of the laser device 31 and the fixed base device 32, or one or both of the laser device 41 and the fixed base device 42 can be adjusted relative to the plane direction (XY direction). It has become. For this reason, each of the fixed base devices 32 and 42 may be configured by attaching a movable table that is movable in the planar direction (XY direction). In particular, the laser device 31 is preferably one that can adjust the movement in the three-axis directions of XYZ.

そして、吸収部形成工程ＰＡ１では、第２の樹脂材２の表面２１に対しレーザ装置３１からのパルスレーザ光Ｒｐを予め設定されたスキャンルート（走査ルート）Ｓに沿って第２の樹脂材２の表面２１上を繰り返しスキャンさせることにより、上記表面２１に対し所定幅ｗ（例えば１〜２ｍｍ幅）の吸収部２２（図２（ａ）も併せて参照）を形成する。吸収部２２は、上記のパルスレーザ光Ｒｐを照射することにより表面２１に微小な焦げ部分を形成したものであり、これを所定のスキャンルートＳに沿って連続的に形成したものである。所望の幅ｗの帯状の吸収部２２にするためには、幅ｗ方向に対し微小幅の走査ピッチ（例えば４０〜５０μｍ）毎に開始位置をずらせて上記のスキャンルートＳに平行にスキャンさせ、これを繰り返すようにすればよい。あるいは、レーザ装置３１の選択によって、繰り返しのスキャンをすることなく、１回だけの走査（スキャン）を行うだけでもよいし、１回だけの走査（スキャン）を行うだけにより所定幅ｗ（例えば１〜２ｍｍ幅）の吸収部２２の形成を行わせるようにしてもよい。   In the absorption part forming step PA1, the second resin material 2 is applied to the surface 21 of the second resin material 2 along the scan route (scanning route) S in which the pulse laser light Rp from the laser device 31 is set in advance. By repeatedly scanning the surface 21, an absorbing portion 22 (see also FIG. 2A) having a predetermined width w (for example, 1 to 2 mm width) is formed on the surface 21. The absorbing portion 22 is a portion in which a minute burned portion is formed on the surface 21 by irradiating the pulse laser beam Rp, and is formed continuously along a predetermined scan route S. In order to obtain a band-shaped absorber 22 having a desired width w, the scan position is shifted in parallel with the scan route S by shifting the start position for each scan width (for example, 40 to 50 μm) with a minute width in the width w direction. This should be repeated. Alternatively, depending on the selection of the laser device 31, only one scan (scan) may be performed without performing repeated scans, or a predetermined width w (for example, 1) by performing only one scan (scan). The absorption portion 22 having a width of ˜2 mm may be formed.

このような焦げ部分を形成するためのパルスレーザ光Ｒｐとしては、例えばＹＡＧレーザや、ＹＶＯ４（イットリウム・バーナデート）結晶にＮｄ（ネオジウム）をドープしたＹＶＯ４レーザを用い、波長としては例えば１０６４ｎｍ（ナノメートル）、パルス発振の周波数としては例えば１０〜４００ｋＨｚ（キロヘルツ）、レーザ出力としては例えば平均出力で５〜１０Ｗ(ワット)、スキャンスピード（走査速度）として例えば１０００〜１４００ｍｍ／ｓｅｃを用いればよい。なお、このようなパルスレーザ光により形成される吸収部２２は、第２の樹脂材２の基材又はこれに添加された着色剤（顔料）が炭化して黒色又は黒色に近い濃色の焦げ部分が形成されるものと考えられる。あるいは、基材又は着色剤がパルスレーザ光を受けて化学変性を生じレーザ光の吸収性を高める黒系の濃色に化学変化して吸収部２２が形成されるものでもよい。すなわち、パルスレーザ光を表面に照射することで、本来はレーザ光反射性が勝っている樹脂材の表面にレーザ光吸収性の強い黒色又は黒色に近い濃色（例えばグレー）の吸収部２２が形成されるものであれば、その形成メカニズムの如何は問わない。   As the pulse laser beam Rp for forming such a burnt portion, for example, a YAG laser or a YVO4 laser in which YVO4 (yttrium vernadate) crystal is doped with Nd (neodymium) is used, and the wavelength is, for example, 1064 nm (nano Meter), a pulse oscillation frequency of, for example, 10 to 400 kHz (kilohertz), a laser output of, for example, an average output of 5 to 10 W (watts), and a scan speed (scanning speed) of, for example, 1000 to 1400 mm / sec. The absorbing portion 22 formed by such a pulsed laser beam is black or dark-colored near the black due to carbonization of the base material of the second resin material 2 or the colorant (pigment) added thereto. It is thought that a part is formed. Alternatively, the absorbing portion 22 may be formed by chemically changing the base material or the colorant to a black dark color that generates chemical modification upon receiving pulsed laser light and enhances the absorption of the laser light. In other words, by irradiating the surface with pulsed laser light, the surface of the resin material that is originally excellent in laser light reflectivity has a black or dark-colored (for example, gray) absorbing portion 22 that has a strong laser light absorption property. Any formation mechanism may be used as long as it is formed.

次に、この吸収部形成工程ＰＡ１で吸収部２２が形成された第２の樹脂材２の表面２１の上に対し、重ね合わせ工程ＰＡ２で第１の樹脂材１を重ね合わせる。そして、これを溶着ユニット４に送ってこの溶着ユニット４において溶着工程ＰＡ３を行う。
溶着工程ＰＡ３では、レーザ装置４１から連続レーザ光Ｒｃを出射させて、第１の樹脂材１の上から上記第２の樹脂材の表面２１の吸収部２２に入射させる。すなわち、図２（ｂ）にも示すように、連続レーザ光Ｒｃを第１の樹脂材１の上から照射させると、その連続レーザ光Ｒｃは第１の樹脂材１を透過して当接境界面を構成する表面２１の吸収部２２（図２（ａ）参照）に入射される。この連続レーザ光Ｒｃの照射を受けて吸収部２２が発熱し、この発熱により吸収部２２近傍の第２の樹脂材２が溶融し、さらに吸収部２２の発熱及び上記の溶融熱を受けて吸収部２２近傍の第１の樹脂材１も溶融し始める。そして連続レーザ光Ｒｃの通過後の放熱冷却により当接境界面を挟んだ両樹脂材１，２の溶融部分が互いに結合した状態で硬化し、両樹脂材１，２を互いに連結する溶着部２３が形成されることになる。これにより、両樹脂材１，２のレーザ溶着が完了する。 Next, the first resin material 1 is superposed on the surface 21 of the second resin material 2 on which the absorbent portion 22 is formed in the absorbent portion forming step PA1 in the superposition step PA2. And this is sent to the welding unit 4, and welding process PA3 is performed in this welding unit 4. FIG.
In the welding process PA3, the continuous laser beam Rc is emitted from the laser device 41 and is incident on the absorption portion 22 of the surface 21 of the second resin material from above the first resin material 1. That is, as shown in FIG. 2B, when the continuous laser light Rc is irradiated from above the first resin material 1, the continuous laser light Rc passes through the first resin material 1 and is in contact with the contact boundary. The light is incident on the absorbing portion 22 (see FIG. 2A) of the surface 21 constituting the surface. The absorption part 22 generates heat upon receiving the irradiation of the continuous laser beam Rc, and the second resin material 2 in the vicinity of the absorption part 22 is melted by this heat generation, and further receives the heat generated by the absorption part 22 and the above heat of fusion. The first resin material 1 near the portion 22 also starts to melt. Then, by the heat radiation cooling after passing the continuous laser beam Rc, the melted portions of the two resin materials 1 and 2 sandwiching the contact boundary surface are cured in a coupled state, and the weld portion 23 that connects the two resin materials 1 and 2 to each other. Will be formed. Thereby, the laser welding of both the resin materials 1 and 2 is completed.

この溶着工程ＰＡ３でのレーザ溶着を行うための連続レーザ光Ｒｃとしては、従来からレーザ溶着で用いられているＣＯ２レーザや、半導体レーザ等のレーザ光を適用すればよい。例えば波長８０８ｎｍの半導体レーザを用い、レーザ出力として例えば１２０Ｗで５０ｍｍ／ｓｅｃのスキャンスピードでスキャンしつつ照射すればよい。   As the continuous laser beam Rc for performing laser welding in the welding process PA3, a laser beam such as a CO2 laser conventionally used for laser welding or a semiconductor laser may be applied. For example, a semiconductor laser having a wavelength of 808 nm may be used, and irradiation may be performed while scanning with a laser output of 120 W, for example, at a scan speed of 50 mm / sec.

以上の樹脂溶着方法の場合、レーザ光反射性が勝ってそのままではレーザ透過溶着法が適用できず、従来では当接境界面に対し塗料等の塗布や樹脂フィルムの貼り付け等により吸収媒体を介在させるという追加部品及び追加工数の発生が不可避であった、上記の第２の樹脂材を対象にしたとしても、上記の追加部品や追加工数を必要とすることなく、容易にレーザ透過溶着法を適用することができるようになる。すなわち、溶着工程ＰＡ３の前段階において、パルスレーザ光を照射する吸収部形成工程ＰＡ１を行うことで、容易にしかも確実なレーザ溶着を実現させることができる。これにより、上記の樹脂フィルム等の追加部品や、その貼り付けという追加工数をかける必要を無くすことができる、つまり省略することができるようになる。しかも、上記の樹脂フィルムの貼り付けによる吸収媒体の形成の場合と異なり、パルスレーザ光による吸収部２２の形成の場合には、吸収部形成工程の終了後、つまり吸収部２２の形成後、直ちに溶着工程ＰＡ３を開始することができ、第１及び第２の樹脂材１，２の溶着ラインの加工効率を飛躍的に高めることもできるようになる。   In the case of the above resin welding methods, the laser transmission welding method cannot be applied as it is because the laser light reflectivity is excellent, and conventionally, an absorbing medium is interposed by applying paint or pasting a resin film to the contact boundary surface. Even if the second resin material is inevitable to generate additional parts and additional man-hours, the laser transmission welding method can be easily performed without requiring the additional parts and additional man-hours described above. Will be able to apply. That is, by performing the absorption part forming step PA1 in which the pulse laser beam is irradiated in the previous stage of the welding step PA3, easy and reliable laser welding can be realized. As a result, it is possible to eliminate the need for additional parts such as the above-described resin film and the additional man-hour of attaching the resin film, that is, it can be omitted. Moreover, unlike the case of forming the absorbing medium by pasting the resin film, in the case of forming the absorbing portion 22 by pulse laser light, immediately after the absorption portion forming process is completed, that is, immediately after the forming of the absorbing portion 22. The welding process PA3 can be started, and the processing efficiency of the welding lines for the first and second resin materials 1 and 2 can be dramatically increased.

＜第２実施形態＞
図３は、本発明の第２実施形態に係る樹脂溶着方法の工程図と各工程における樹脂材の状態を示すものである。第２実施形態の樹脂溶着方法は、まず第１及び第２の両樹脂材１，２を互いに重ね合わせる重ね合わせ工程ＰＢ１を行い、次に、この重ね合わせた状態で当接境界面を構成する第２の樹脂材２の表面２１に対し吸収部２２を形成する吸収部形成工程ＰＢ２を行い、続いてその第１及び第２の両樹脂材１，２を互いに溶着させる溶着工程ＰＢ３を行うものである。なお、以後の説明では、第１実施形態の構成要素と同じものには第１実施形態と同一符号を付してその詳細な説明を省略する。 <Second Embodiment>
FIG. 3 shows a process diagram of the resin welding method according to the second embodiment of the present invention and the state of the resin material in each process. In the resin welding method according to the second embodiment, first, the overlapping process PB1 is performed in which the first and second resin materials 1 and 2 are overlapped with each other, and then the contact boundary surface is configured in the overlapped state. An absorption part forming step PB2 for forming the absorption part 22 on the surface 21 of the second resin material 2 is performed, followed by a welding process PB3 for welding the first and second resin materials 1 and 2 together. It is. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted.

第２実施形態の場合の第１の樹脂材１としては第１実施形態の第１の樹脂材１と同じ特性のものが使用可能であるが、特にその吸収部２２のより確実な形成という観点からは、より透過性の高い樹脂であることが望ましく、特に着色又は無着色の透明樹脂を用いるのが好ましい。   As the first resin material 1 in the second embodiment, one having the same characteristics as the first resin material 1 in the first embodiment can be used. Therefore, it is desirable that the resin is more permeable, and it is particularly preferable to use a colored or non-colored transparent resin.

吸収部形成工程ＰＢ２では吸収部形成ユニット３のレーザ装置３１からのパルスレーザ光Ｒｐを第１の樹脂材１の上から照射すると、そのパルスレーザ光Ｒｐが第１の樹脂材１を透過して第２の樹脂材２の表面２１に入射し、この表面２１に対し吸収部２２が形成されることになる。形成の理屈、用いるレーザ光及びその仕様、並びに、レーザ光の照射方法及びその手順等は第１実施形態において説明したと同様である。   In the absorption part forming step PB2, when the pulse laser light Rp from the laser device 31 of the absorption part forming unit 3 is irradiated from above the first resin material 1, the pulse laser light Rp is transmitted through the first resin material 1. The light enters the surface 21 of the second resin material 2, and the absorbing portion 22 is formed on the surface 21. The reason for formation, the laser beam used and its specifications, the laser beam irradiation method and its procedure, and the like are the same as those described in the first embodiment.

そして、溶着工程ＰＢ３においてレーザ装置４１からの連続レーザ光Ｒｃを第１の樹脂材１の上から照射すると、その連続レーザ光Ｒｃが第１の樹脂材１を透過して第２の樹脂材２の表面２１の吸収部２２に入射し、これにより、吸収部２２の発熱、吸収部２２近傍位置の第２の樹脂材２の溶融、及び、併せて吸収部２２近傍位置の第１の樹脂材１の溶融が生じ、これらの溶融部分が連続レーザ光Ｒｃの通過により硬化して溶着部２３が形成されてレーザ溶着が行われることになる。以上の溶着工程ＰＢ３での使用レーザ光の仕様や溶着メカニズム等は、第１実施形態の溶着工程ＰＡ３で説明したものと同じである。   Then, when the continuous laser light Rc from the laser device 41 is irradiated from above the first resin material 1 in the welding step PB3, the continuous laser light Rc passes through the first resin material 1 and the second resin material 2. Is incident on the absorption portion 22 of the surface 21 of the resin, thereby generating heat of the absorption portion 22, melting of the second resin material 2 in the vicinity of the absorption portion 22, and, in addition, the first resin material in the vicinity of the absorption portion 22 1 is melted, and these melted portions are cured by the passage of the continuous laser beam Rc to form the welded portion 23 and laser welding is performed. The specifications of the laser beam used, the welding mechanism, and the like in the above-described welding process PB3 are the same as those described in the welding process PA3 of the first embodiment.

この第２実施形態の場合は、最初から第１及び第２の両樹脂材１，２を互いに重ね合わせた状態で吸収部形成工程ＰＢ２と、溶着工程ＰＢ３とを連続して実行させ得るため、第１実施形態の場合よりも溶着ラインにおけるレーザ溶着のための加工時間の短縮化や効率化を図ることができることになる。   In the case of the second embodiment, since the first and second resin materials 1 and 2 are superposed on each other from the beginning, the absorption part forming step PB2 and the welding step PB3 can be continuously executed. Compared to the case of the first embodiment, the processing time for laser welding in the welding line can be shortened and the efficiency can be improved.

＜第３実施形態＞
図４及び図５は、第１又は第２実施形態の樹脂溶着方法を適用して、浴室電気機器であるリモコン５の外装ケース５１を構成する２つの部材である本体６と蓋７とを互いにレーザ溶着し、これにより、外装ケース５１を水密構造にするようにした第３実施形態を示すものである。 <Third Embodiment>
4 and 5 apply the resin welding method of the first or second embodiment, and the main body 6 and the lid 7 which are two members constituting the exterior case 51 of the remote controller 5 which is a bathroom electric appliance are mutually connected. 3rd Embodiment which carried out laser welding and was made to make the exterior case 51 into the watertight structure by this is shown.

以下、第１実施形態の如き吸収部形成工程ＰＡ１、重ね合わせ工程ＰＡ２、そして、溶着工程ＰＡ３を適用した場合について説明する。もちろん、蓋７を例えば透明樹脂により構成して第２実施形態の如き樹脂溶着方法を適用してもよい。   Hereinafter, the case where the absorption part formation process PA1, superposition process PA2, and welding process PA3 like 1st Embodiment are applied is demonstrated. Of course, the lid 7 may be made of, for example, a transparent resin, and the resin welding method as in the second embodiment may be applied.

外装ケース５１を構成する本体６と蓋７とは共に熱可塑性樹脂により形成され、特に本体６は第１又は第２実施形態における第２の樹脂材２に相当する樹脂により形成され、蓋７は第１又は第２実施形態における第１の樹脂材１に相当する樹脂により形成されている。本体６はその背面が開口部６１とされ、その開口縁の内側には蓋７の厚みに相当する深さ位置に凹段部６２が全周に連続して形成されている。図４中の符号５２は本体６内に収容されるリモコン５の機器本体である。そして、蓋７は上記の開口部６１と同形状に形成され、開口部６１から上記の凹段部６２に対し内嵌させると背面が遮蔽されて面一になるようになっている（図５参照）。つまり、凹段部６２の段面６２１が蓋７との当接境界面を構成し、ここが接合部を構成することになる。   The main body 6 and the lid 7 constituting the outer case 51 are both formed of a thermoplastic resin. In particular, the main body 6 is formed of a resin corresponding to the second resin material 2 in the first or second embodiment. It is formed of a resin corresponding to the first resin material 1 in the first or second embodiment. The back surface of the main body 6 is an opening 61, and a concave step 62 is continuously formed on the inner periphery of the opening edge at a depth corresponding to the thickness of the lid 7. Reference numeral 52 in FIG. 4 denotes a device main body of the remote controller 5 accommodated in the main body 6. The lid 7 is formed in the same shape as the opening 61, and the back surface is shielded and flush with the concave stepped portion 62 through the opening 61 (FIG. 5). reference). That is, the step surface 621 of the concave step portion 62 constitutes a contact boundary surface with the lid 7, and this constitutes a joint portion.

このような本体６に対し、まず吸収部形成工程ＰＡ１を実行する。すなわち、図４に示すように、上記の凹段部６２の段面６２１に対し第１実施形態と同様のパルスレーザ光Ｒｐ（例えば吸収部形成ユニット３のレーザ装置３１からのパルスレーザ光Ｒｐ）を照射して吸収部２２を全周に亘り形成する。全周に亘り吸収部２２を形成するために、パルスレーザ光Ｒｐを段面６２１の延びるラインに沿って矩形状に一周するスキャンルートＳｃを予め設定し、このスキャンルートＳｃに沿ってパルスレーザ光Ｒｐをスキャンさせる。吸収部２２の形成幅等についても第１実施形態において説明したと同様である。   First, the absorption part forming step PA1 is performed on the main body 6 as described above. That is, as shown in FIG. 4, the same pulse laser beam Rp as that of the first embodiment (for example, the pulse laser beam Rp from the laser device 31 of the absorption unit forming unit 3) is applied to the step surface 621 of the concave step portion 62. To form the absorber 22 over the entire circumference. In order to form the absorption part 22 over the entire circumference, a scan route Sc that makes a round around the pulse laser beam Rp along the line extending the step surface 621 is set in advance, and the pulse laser beam is set along the scan route Sc. Rp is scanned. The formation width and the like of the absorbing portion 22 are the same as described in the first embodiment.

次に、蓋７を開口部６１から凹段部６２に内嵌させて重ね合わせ工程ＰＡ２を行う。これにより、蓋７はその周縁部下面が段面６２１と当接してこれが当接境界面となる（図５参照）。そして、この状態の外装ケース５１に対し、その蓋７側から連続レーザ光Ｒｃ（例えば溶着ユニット４のレーザ装置４１からの連続レーザ光Ｒｃ）を照射して溶着工程ＰＡ３を実行する（図５参照）。この場合も連続レーザ光ＲｃをスキャンルートＳｃに沿って連続して走査させる。これにより、蓋７を透過した連続レーザ光Ｒｃが段面６２１の吸収部２２に入射され、吸収部２２が発熱して本体６側を溶融させると共に蓋７の側も溶融させ、これらの溶融部が互いに結合して溶着部２３が形成されることになる。この溶着部２３が段面６２１に沿って全周に亘って形成されることで、本体６の開口部６１の側は蓋７により完全に遮断されて水密構造にすることができる。   Next, the lid 7 is fitted into the recessed step portion 62 from the opening 61, and the overlapping process PA2 is performed. As a result, the lower surface of the peripheral edge of the lid 7 abuts on the step surface 621, which becomes the abutting boundary surface (see FIG. 5). The exterior case 51 in this state is irradiated with continuous laser light Rc (for example, continuous laser light Rc from the laser device 41 of the welding unit 4) from the lid 7 side to execute the welding process PA3 (see FIG. 5). ). Also in this case, the continuous laser beam Rc is continuously scanned along the scan route Sc. As a result, the continuous laser beam Rc transmitted through the lid 7 is incident on the absorbing portion 22 of the stepped surface 621, the absorbing portion 22 generates heat, melts the main body 6 side, and also melts the lid 7 side. Are joined together to form the welded portion 23. By forming the welded portion 23 over the entire circumference along the stepped surface 621, the opening 61 side of the main body 6 can be completely blocked by the lid 7 to form a watertight structure.

このような水密構造に加工する上で、第１実施形態又は第２実施形態の如き樹脂溶着方法を適用することにより、第１又は第２実施形態において説明したように・追加の部品や工数の必要性を排して容易かつ確実にしかも低コストで水密構造を実現させることができるようになる。   In processing into such a watertight structure, by applying the resin welding method as in the first embodiment or the second embodiment, as described in the first or second embodiment, additional parts and man-hours A watertight structure can be realized easily, reliably and at a low cost by eliminating the necessity.

なお、第３実施形態では浴室電気機器としてリモコン５を例示したが、これに限らず、その他のものでもよく、それらに上記の如く第１又は第２実施形態の樹脂溶着方法を適用することで第３実施形態と同様の作用効果を得ることができる。   In the third embodiment, the remote controller 5 is exemplified as the bathroom electric appliance. However, the remote controller 5 is not limited to this, and other devices may be used. By applying the resin welding method according to the first or second embodiment as described above, the remote controller 5 may be used. The same effects as those of the third embodiment can be obtained.

第１実施形態で説明した第１の樹脂材１（図１又は図２参照）及び第２樹脂材２とそれぞれ同じ樹脂材の組み合わせを用いてレーザ溶着した場合の実施例と、比較例１，２との溶着強度についての対比試験を行った。実施例は、上記の樹脂材の組み合わせを用いて第１実施形態の樹脂溶着方法、すなわち吸収部形成工程ＰＡ１と溶着工程ＰＡ３とを行ってレーザ溶着したものである。比較例１は、上記の樹脂材の組み合わせを用いて、第２の樹脂材２に対する吸収部形成工程ＰＡ１（吸収部２２の形成）を行うことなく、溶着工程ＰＡ３のみを行ったものである。比較例２は、上記の樹脂材の組み合わせを用いて、第２の樹脂材２の表面２１に対し吸収部２２を形成する代わりに黒色の油性インクを塗布した上で、溶着工程ＰＡ３を行ったものである。   Examples in the case of laser welding using the same resin material combination as the first resin material 1 (see FIG. 1 or 2) and the second resin material 2 described in the first embodiment, and Comparative Example 1, A comparison test on the welding strength with 2 was performed. In Examples, laser welding is performed by performing the resin welding method of the first embodiment, that is, the absorption portion forming process PA1 and the welding process PA3, using the combination of the above resin materials. In Comparative Example 1, only the welding process PA3 was performed using the combination of the resin materials described above, without performing the absorption part formation process PA1 (formation of the absorption part 22) on the second resin material 2. In Comparative Example 2, using the combination of the resin materials described above, the black oil-based ink was applied to the surface 21 of the second resin material 2 instead of forming the absorbing portion 22, and then the welding process PA3 was performed. Is.

上記の樹脂の組み合わせについて、より詳細に説明すると、第１の樹脂材及び第２の樹脂材として共に熱可塑性のＡＢＳ樹脂を用い、第１の樹脂材として無着色ではあるが薄い黄色の自然色の半透明樹脂（日本Ａ＆Ｌ株式会社製の型名ＮＨ−１２００Ａのナチュラル）を用いた。この第１の樹脂材のレーザ光の透過率は５７％である。第２の樹脂材としては白色に着色された不透明の樹脂（日本Ａ＆Ｌ株式会社製の型名ＮＨ−１２００ＡのＵＤＭ・ホワイト）を用いた。この第２の樹脂材のレーザ光の反射率は８９％である。   The combination of the above resins will be described in more detail. A thermoplastic ABS resin is used as both the first resin material and the second resin material, and the first resin material is a non-colored but light yellow natural color. Semi-transparent resin (natural name of model name NH-1200A manufactured by Japan A & L Co., Ltd.) was used. The transmittance of the laser light of this first resin material is 57%. As the second resin material, an opaque resin colored in white (UDM • white of model name NH-1200A manufactured by Japan A & L Co., Ltd.) was used. The reflectance of the laser beam of this second resin material is 89%.

実施例に対する吸収部形成工程ＰＡ１は、パルスレーザ光Ｒｐとして波長１０６４ｎｍのＹＶＯ４レーザを用い、レーザ平均出力５Ｗでパルス発振の周波数１０ｋＨｚのパスレーザ光にして、１０００ｍｍ／ｓｅｃのスキャンスピードで２ｍｍ幅の吸収部を形成した。又、溶着工程ＰＡ３は、連続レーザ光Ｒｃとして波長８０８ｎｍでレーザ出力１２０Ｗの半導体レーザからの連続レーザ光を用いた。スキャンスピートとしては、実施例及び比較例２については５０ｍｍ／ｓｅｃを設定し、比較例１については２０ｍｍ／ｓｅｃと遅くした。   In the absorption part forming step PA1 for the embodiment, a YVO4 laser with a wavelength of 1064 nm is used as the pulsed laser beam Rp, and a pass laser beam with a pulse average oscillation frequency of 10 kHz and a pulse oscillation frequency of 10 kHz is used. Part was formed. In the welding process PA3, continuous laser light from a semiconductor laser having a wavelength of 808 nm and a laser output of 120 W was used as continuous laser light Rc. As the scan speed, 50 mm / sec was set for Example and Comparative Example 2, and it was slowed to 20 mm / sec for Comparative Example 1.

溶着強度の判定は同一人の試験者の手で第１の樹脂材と第２の樹脂材とを互いに剥離させるように力を加え、その際の破壊状況の如何により判定した。すなわち、剥離させていく側の樹脂材が大きく変形した後に樹脂材自体が破壊する場合には、溶着強度は高度に確保されているものと判定し、樹脂材自体が大きく変形する前に破断するものを溶着強度として一定強度に達していないものと判定するという判定基準を採用することとした。   The determination of the welding strength was carried out by applying the force so that the first resin material and the second resin material were peeled from each other by the hand of the same tester, and the determination was made according to the state of destruction at that time. In other words, if the resin material itself breaks after the resin material on the side to be peeled is greatly deformed, it is determined that the welding strength is highly secured and breaks before the resin material itself deforms greatly. It was decided to adopt the criterion of determining that the welding strength was not reaching a certain strength.

対比試験の結果、実施例と比較例２とはそれぞれ溶着強度は高度に確保されているものと判定されたものの（図６の丸印参照）、比較例１では溶着工程ＰＡ３の連続レーザ光Ｒｃを照射しても第２の樹脂材で反射されてしまい、スキャンスピードを上記の如く遅く設定したにも拘わらず、樹脂材自身に発泡が生じるのみで、レーザ溶着を行うことはできなかった（図６のペケ印参照）。   As a result of the comparison test, although it was determined that the welding strength was high in each of Example and Comparative Example 2 (see the circle in FIG. 6), in Comparative Example 1, the continuous laser beam Rc in the welding process PA3. However, the resin material itself was only foamed despite the fact that the scan speed was set to be slow as described above, and laser welding could not be performed. (See the pique mark in FIG. 6).

以上より、実施例の吸収部形成工程ＰＡ１で形成された吸収部２２（図２参照）により良好な溶着部２３の形成を行うことができ、この結果、確実なレーザ溶着を行うことができることを確認することができた。   From the above, it is possible to form a good welded portion 23 by the absorbing portion 22 (see FIG. 2) formed in the absorbing portion forming step PA1 of the embodiment, and as a result, it is possible to perform reliable laser welding. I was able to confirm.

１ 第１の樹脂材
２ 第２の樹脂材
５ リモコン（浴室電気機器）
６ 本体（第２の樹脂材，２つの部材の１つ）
７ 蓋（第１の樹脂材），２つの部材の１つ）
２１ 表面（当接境界面）
２２ 吸収部
２３ 溶着部
５１ 外装ケース
６２１ 段面（当接境界面，接合部）
ＰＡ１ 吸収部形成工程
ＰＡ２ 重ね合わせ工程
ＰＡ３ 溶着工程
ＰＢ１ 重ね合わせ工程
ＰＢ２ 吸収部形成工程
ＰＢ３ 溶着工程 DESCRIPTION OF SYMBOLS 1 1st resin material 2 2nd resin material 5 Remote control (bathroom electrical equipment)
6 Main body (second resin material, one of the two members)
7 Lid (first resin material, one of the two members)
21 Surface (contact interface)
22 Absorbing part 23 Welding part 51 Exterior case 621 Step surface (contact boundary surface, joint part)
PA1 Absorbing part forming process PA2 Overlapping process PA3 Welding process PB1 Overlapping process PB2 Absorbing part forming process PB3 Welding process

Claims (5)

共に熱可塑性樹脂であって、レーザ光を透過させるレーザ光透過性の第１の樹脂材と、レーザ光を吸収するレーザ光吸収性よりもレーザ光を反射させるレーザ光反射性が勝る第２の樹脂材とを互いに当接するよう重ね合わせ、第１の樹脂材の側からレーザ光を照射させることにより第１及び第２の両樹脂材間の当接境界面において溶着部を形成させる樹脂溶着方法であって、
レーザ光の照射により溶着部を形成するための溶着工程を行う前に、上記当接境界面に対応する第２の樹脂材の面に対しレーザ光を照射することにより高レーザ光吸収性を有する濃色部分を吸収部として形成する吸収部形成工程を行うようにする、
ことを特徴とする樹脂溶着方法。 Both are thermoplastic resins, and a first resin material that transmits laser light and a laser beam reflectivity that reflects laser light is superior to a laser beam absorbability that absorbs laser light. A resin welding method for forming a welded portion at a contact boundary surface between the first and second resin materials by overlapping the resin materials so as to contact each other and irradiating laser light from the first resin material side. Because
Before performing the welding process for forming the welded portion by laser light irradiation, the surface of the second resin material corresponding to the contact boundary surface is irradiated with laser light, thereby having high laser light absorption. To perform the absorption part forming step of forming the dark part as the absorption part,
A resin welding method characterized by that. 請求項１に記載の樹脂溶着方法であって、
上記吸収部形成工程を第２の樹脂材に対して行った後に、吸収部が形成された第２の樹脂材に上記第１の樹脂材を重ね合わせ、重ね合わせた状態の第１の樹脂材の側からレーザ光を照射することにより溶着工程を行うようにする、樹脂溶着方法。 The resin welding method according to claim 1,
After the absorption part forming step is performed on the second resin material, the first resin material is overlaid on the second resin material on which the absorption part is formed, and the first resin material is overlaid. A resin welding method in which a welding process is performed by irradiating a laser beam from the side of the resin. 請求項１に記載の樹脂溶着方法であって、
上記吸収部形成工程を、第１及び第２の両樹脂材を互いに重ね合わせた後に、その重ね合わせた状態でレーザ光を第１の樹脂材の側から照射することにより行うようにする、樹脂溶着方法。 The resin welding method according to claim 1,
Resin for performing the absorption part forming step by irradiating laser light from the first resin material side in a state where both the first and second resin materials are superposed on each other. Welding method. 請求項１〜請求項３のいずれかに記載の樹脂溶着方法であって、
上記吸収部形成工程で照射するレーザ光としてパルスレーザ光を用いるようにする、樹脂溶着方法。 It is the resin welding method in any one of Claims 1-3,
A resin welding method in which a pulsed laser beam is used as the laser beam irradiated in the absorption part forming step. 外装ケースが少なくとも２つの部材を接合させることにより組み立てられる浴室電気機器であって、
上記外装ケースを構成する上記少なくとも２つの部材の接合部が請求項１〜請求項４のいずれかに記載の樹脂溶着方法により互いに溶着されて上記外装ケースが水密構造を備えるように形成されている
ことを特徴とする浴室電気機器。 A bathroom electrical device in which an exterior case is assembled by joining at least two members,
The joint part of the said at least 2 member which comprises the said exterior case is welded mutually by the resin welding method in any one of Claims 1-4, and the said exterior case is formed so that a watertight structure may be provided. Bathroom electrical equipment characterized by that.
JP2009108572A 2009-04-28 2009-04-28 Resin welding method and bathroom electrical equipment formed by this method Expired - Fee Related JP5229091B2 (en)

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