WO2010150841A1 - Laser welding method for resin material and resin molding - Google Patents

Laser welding method for resin material and resin molding Download PDF

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Publication number
WO2010150841A1
WO2010150841A1 PCT/JP2010/060726 JP2010060726W WO2010150841A1 WO 2010150841 A1 WO2010150841 A1 WO 2010150841A1 JP 2010060726 W JP2010060726 W JP 2010060726W WO 2010150841 A1 WO2010150841 A1 WO 2010150841A1
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WO
WIPO (PCT)
Prior art keywords
resin material
light
gate
light transmissive
laser welding
Prior art date
Application number
PCT/JP2010/060726
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French (fr)
Japanese (ja)
Inventor
浩司 浦瀬
康志 永野
Original Assignee
パナソニック電工株式会社
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Publication of WO2010150841A1 publication Critical patent/WO2010150841A1/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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—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
    • B29C66/114—Single butt 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
    • B29C66/20—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
    • B29C66/20—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
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—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
    • B29C66/80—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
    • B29C66/836—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
    • 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
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7162—Boxes, cartons, cases

Definitions

  • the present invention relates to a laser welding method of a resin material and a resin molded product.
  • Both the light-absorbing resin material that absorbs the laser light and the light-transmitting resin material that transmits the laser light are superposed and pressurized, and both are irradiated to the interface through the light-transmitting resin material.
  • a laser welding method of a resin material for welding a resin material has been proposed.
  • FIG. 4A when the laser beam 130 is irradiated through the light transmissive resin material 110 in a state where the pressing force 150 is applied with a pressing jig (not shown), the laser light 130 is hardly absorbed by the light transmissive resin material 110. It is transmitted and absorbed near the surface of the light absorbing resin material 120. The energy of the absorbed laser beam 130 is converted into heat. Then, the surface of the light absorbing resin material 120 is heated by this heat. Furthermore, the surface of the light-transmitting resin material 110 in contact with the surface of the light-absorbing resin material 120 is also heated by the transfer of this heat.
  • a case body 220 made of a light-absorbing resin and a light-transmitting resin in a rectangular box-like case 201.
  • the lid 210 can be welded and sealed.
  • the light transmissive resin material 110 is molded by injecting molten light transmissive resin from a gate provided in a mold cavity.
  • the light transmissive resin material 110 shown in FIGS. 4A and 4B is formed by providing a gate 141 at a location facing the side surface with respect to the irradiation direction of the laser light 130.
  • a gate provided at a location facing the side surface of the mold, such as the gate 141 is referred to as a side gate.
  • the light transmissive resin material 110 has a characteristic that the light transmittance of the laser light at each part changes depending on the molding conditions, and the variation in the light transmittance increases depending on the part.
  • the flow distance from the gate at which the melted light-transmitting resin flows in the cavity affects the light transmittance.
  • the gate 341 of the mold cavity of the light transmissive resin material 310 is a side gate.
  • the light transmissive resin material 310 is formed by injecting molten light transmissive resin from the side gate 341.
  • the light-transmitting resin material 310 has a square laser light irradiation surface with a side of 110 mm and is formed to have a thickness of 1 mm.
  • the mold temperature at the time of molding is 40 ° C., and the wavelength of the laser beam to be irradiated is 1054 nm. Then, the laser beam is irradiated along the square path 311 located at the periphery of the laser beam irradiation surface of the light transmissive resin material 310.
  • the light transmittance of the laser light is measured at a plurality of measurement points on the square path 311 of the light transmissive resin material 310.
  • the measurement points are the vertices on the square path 311 and the midpoints of the sides (P1, P21, P22, P31, P32, P4, P51, P52 in FIG. 6A).
  • the measurement result of the light transmittance of the laser light is shown in FIG. 6B as the correlation between the flow distance and the light transmittance at each measurement point of the light transmissive resin material.
  • the flow distance at each measurement point of the light-transmitting resin material is the distance from the side gate 341 to each measurement point of the light-transmitting resin material 310 after molding, that is, the molten light-transmitting resin is the side gate 341. It is the distance which flowed from reaching to each measurement point.
  • the distances from the side gate 341 to P1, P21 (P22), P31 (P32), P4, and P51 (P52) are 30 mm, 50 mm, 80 mm, 115 mm, and 120 mm, respectively.
  • the light transmittance of the light transmissive resin material 310 decreases as the flow distance from the side gate 341 decreases, and increases as the flow distance increases. Accordingly, when the light-transmitting resin material 310 is molded by injecting molten light-transmitting resin from the side gate 341, the flow distance from the gate 341 to each point on the path 311 is non-uniform, and thus the path 311 Also, the light transmittance of the laser light at each point becomes non-uniform.
  • the laser light conditions are constant. Even if it exists, the welding strength in the interface of the light transmissive resin material 310 and the light absorptive resin material will become non-uniform
  • the cost is increased and the number of gate traces increases. Further, the cost increases due to an increase in the amount of resin remaining in the runner. Further, the number of times of adding the crystallization accelerator is increased, which further increases the cost.
  • the present invention has been made in view of the above-mentioned reasons, and the object thereof is a laser welding method and resin molding of a resin material that can reduce variation in light transmittance on an area irradiated with laser light simply and inexpensively. Is to provide goods.
  • the laser welding method of the resin material in the present invention includes the following procedures.
  • the light-transmitting resin material is overlaid on the light-absorbing resin material. Then, by irradiating the interface between the light-transmitting resin material and the light-absorbing resin material with laser light through a predetermined irradiation area on the light-transmitting resin material, the light-absorbing resin material and the light at this interface are irradiated.
  • a permeable resin material is welded.
  • the light transmissive resin material is formed so that variation in light transmittance in the irradiation area in the light transmissive resin material is reduced.
  • the laser beam is uniformly irradiated at the portion corresponding to the irradiation area in the interface between the light-transmitting resin material and the light-absorbing resin material, so that the laser beam is uniformly heated. Allows to convert. Thereby, uniform and sufficient welding strength between the light-transmitting resin material and the light-absorbing resin material can be obtained. Therefore, the present invention makes it possible to easily perform laser welding of a resin material for obtaining uniform and sufficient welding strength.
  • this irradiation area is preferably set at the periphery of the light-transmitting resin material.
  • the laser welding method of the present invention preferably comprises the following procedure.
  • the light transmissive resin material is molded by injecting molten light transmissive resin into a cavity in the mold and curing it.
  • the irradiation area is the entire circumference of the periphery of the molded light-transmitting resin material, and the light-transmitting resin is cavityd through a gate provided at a position corresponding to the central portion away from the periphery of the light-transmitting resin material. Inject.
  • variation in the welding strength in the peripheral part between a light transmissive resin material and a light absorptive resin material can further be reduced.
  • the gate is preferably a pin gate.
  • the resin of the gate is automatically cut in the molding process, so that the process of cutting the resin of the gate is not necessary, and the cost can be reduced.
  • the gate is preferably a direct gate.
  • the direct gate By adopting the direct gate, the cavity processing becomes easy, so the cost can be reduced.
  • the gate is preferably a tunnel gate.
  • molding can be made inconspicuous.
  • a resin molded product is formed by the above laser welding method of the present invention.
  • FIG. 3B is a cross-sectional view taken along line AA of the mold shown in FIG. 3A.
  • the laser beam 30 is irradiated along the vertical direction.
  • the resin material is composed of a main body formed of a light-absorbing resin material 20 and a lid formed of a light-transmitting resin material 10. Case 1 is used.
  • the light transmitting resin material 10 and the light absorbing resin material 20 are welded by irradiating the laser light 30 along a predetermined irradiation area (the path 11 in the present embodiment) on the upper surface of the light transmitting resin material 10. be able to.
  • the light-absorbing resin material 20 is formed in a box shape having an upper surface opened, and the light-transmitting resin material 10 is formed in a square plate shape. Then, the light-transmitting resin material 10 is disposed on the light-absorbing resin material 20 so as to cover the opening of the light-absorbing resin material 20. Then, along the path 11 formed at the upper surface periphery of the square light-transmitting resin material 10 toward the interface between the upper surface located at the opening periphery of the light-absorbing resin material 20 and the lower surface of the light-transmitting resin material 10. By irradiating the laser beam 30, the light-transmitting resin material 10 and the light-absorbing resin material 20 are welded.
  • the path 11 in the present embodiment is a square having sides parallel to the front-rear direction and the left-right direction.
  • the light-transmitting resin material 10 is made of, for example, polyester resin such as polyethylene terephthalate (P B T), polyethylene terephthalate (P E T), polyolefin resin such as polyethylene and polypropylene, polyamide resin, vinyl chloride resin, fluorine resin, and the like. Is done.
  • polyester resin such as polyethylene terephthalate (P B T), polyethylene terephthalate (P E T), polyolefin resin such as polyethylene and polypropylene, polyamide resin, vinyl chloride resin, fluorine resin, and the like. Is done.
  • the cavity 42 of the mold 40 of the light transmissive resin material 10 is formed in a square plate-like space, and the region in the path 11 of the laser light 30 formed in a square shape on the upper surface of the light transmissive resin material 10.
  • a gate 41 is provided at a position facing the center 12.
  • the light transmissive resin material 10 is molded by injecting molten light transmissive resin from the gate 41 provided in the cavity 42 of the mold 40. Further, by providing the gate 41 at a position facing the center 12, the melted light-transmitting resin spreads concentrically from the center 12. Therefore, the molded light-transmitting resin material 10 has a longer flow distance from the center 12 toward the outer periphery.
  • the equidistant line 13 of a flow distance is shown with a dashed-dotted line.
  • the light transmittance of the laser light 30 in the light transmissive resin material 10 depends on the flow distance from the gate 41. As described above, the longer the flow distance, the greater the light transmittance. Therefore, the closer to the periphery of the upper surface of the light transmissive resin material 10, the higher the light transmittance. Further, at the same flow distance, the light transmittance is also equal. Since the peripheral distance of the upper surface of the light transmissive resin material 10 has the same flow distance, the light transmittance is also equal. Therefore, since the path 11 on the upper surface of the light transmissive resin material 10 is formed at the periphery, the light transmittance on this path is considered to be uniform with little variation.
  • the path 13 of the laser beam 103 is square as in the present embodiment, for example, there is a difference in flow distance between the midpoint 14 and the apex 15 of the side constituting the path 13.
  • this difference in flow distance is so small that it can be ignored, and the difference in light transmittance between the midpoint 14 and the vertex 15 is so small that it can be ignored. Therefore, the light transmittance of the laser light is considered to be uniform on the path 11 where the laser light 30 is irradiated.
  • the light transmittance on the path 11 is determined. Since it is uniform, the dispersion
  • the gate 41 is constituted by a pin gate, the resin of the gate 41 is automatically cut in the molding process of the light-transmitting resin material 10, so that the process of cutting the resin of the gate 41 is not necessary, and the cost is reduced. Can be lowered. Further, when the gate 41 is constituted by a direct gate, the processing for providing the gate 41 in the mold cavity becomes easy, so that the cost can be reduced. In addition, when the gate 41 is constituted by a tunnel gate, the gate trace generated after the molding of the light transmissive resin material 10 can be made inconspicuous.

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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)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Disclosed is a laser welding method for a resin material which comprises the following steps. A light transmissive resin material (10) is superposed on a light absorbent resin material (20). Further, an interface between the light transmissive resin material (10) and the light absorbent resin material (20) is irradiated with a laser light (30) through a predetermined irradiation area on the light transmissive resin material (10), thereby welding the light absorbent resin material (20) and the light transmissive resin material (10) to each other. The laser welding method for the resin material is characterized in that the light transmissive resin material (10) is formed so that the variation in light transmittance is reduced in the irradiation area on the light transmissive resin material (10). As a result, it is possible to provide a simple, low-cost laser resin molding of the resin material which obtains high welding strength.

Description

樹脂材のレーザー溶着方法および樹脂成形品Laser welding method of resin material and resin molded product
　本発明は、樹脂材のレーザー溶着方法および樹脂成形品に関するものである。 The present invention relates to a laser welding method of a resin material and a resin molded product.
　レーザー光を吸収する光吸収性樹脂材と、レーザー光を透過させる光透過性樹脂材とを重ね合わせて加圧し、その界面に向けて光透過性樹脂材を通してレーザー光を照射することで、両樹脂材を溶着する樹脂材のレーザー溶着方法が提案されている。 Both the light-absorbing resin material that absorbs the laser light and the light-transmitting resin material that transmits the laser light are superposed and pressurized, and both are irradiated to the interface through the light-transmitting resin material. A laser welding method of a resin material for welding a resin material has been proposed.
　従来の樹脂材のレーザー溶着方法について説明する。図４Ａにおいて、押さえ冶具（図示無し）で加圧力１５０を加えた状態で、光透過性樹脂材１１０を通してレーザー光１３０を照射すると、レーザー光１３０は光透過性樹脂材１１０ではほとんど吸収されずに透過して、光吸収性樹脂材１２０の表面付近で吸収される。吸収されたレーザー光１３０のエネルギーは熱に変換される。そして、光吸収性樹脂材１２０の表面がこの熱によって加熱する。さらに、この熱が伝わることによって、光吸収性樹脂材１２０の表面に接する光透過性樹脂材１１０の表面も加熱される。 The conventional laser welding method for resin materials will be described. In FIG. 4A, when the laser beam 130 is irradiated through the light transmissive resin material 110 in a state where the pressing force 150 is applied with a pressing jig (not shown), the laser light 130 is hardly absorbed by the light transmissive resin material 110. It is transmitted and absorbed near the surface of the light absorbing resin material 120. The energy of the absorbed laser beam 130 is converted into heat. Then, the surface of the light absorbing resin material 120 is heated by this heat. Furthermore, the surface of the light-transmitting resin material 110 in contact with the surface of the light-absorbing resin material 120 is also heated by the transfer of this heat.
　その結果、図４Ｂに示すように、光吸収性樹脂材１２０と光透過性樹脂材１１０の界面において、樹脂が溶融されて溶着部１１８が形成される。レーザー光１３０の照射を停止すると、溶融された樹脂が冷却して固化し、両樹脂材が溶着される。 As a result, as shown in FIG. 4B, at the interface between the light-absorbing resin material 120 and the light-transmitting resin material 110, the resin is melted to form a welded portion 118. When the irradiation of the laser beam 130 is stopped, the molten resin is cooled and solidified, and both resin materials are welded.
　また、図５に示すように、レーザー光２３０を照射して走査することで、例えば矩形箱状のケース２０１における、光吸収性樹脂で形成されたケース本体２２０と、光透過性樹脂で形成された蓋２１０とを溶着して密封することができる。光透過性樹脂材１１０は、モールドのキャビティに設けられたゲートから、溶融した光透過性樹脂が注入されることによって成形される。なお、図４Ａ、図４Ｂに示した光透過性樹脂材１１０は、レーザー光１３０の照射方向に対して、側方の面に対向する箇所にゲート１４１が設けられて、成形されている。なお、ゲートには様々な種類のゲートがあるが、ゲート１４１のように、モールドの側方の面に対向する箇所に設けられたゲートをサイドゲートという。 Further, as shown in FIG. 5, by scanning with irradiation with laser light 230, for example, a case body 220 made of a light-absorbing resin and a light-transmitting resin in a rectangular box-like case 201. The lid 210 can be welded and sealed. The light transmissive resin material 110 is molded by injecting molten light transmissive resin from a gate provided in a mold cavity. The light transmissive resin material 110 shown in FIGS. 4A and 4B is formed by providing a gate 141 at a location facing the side surface with respect to the irradiation direction of the laser light 130. Although there are various types of gates, a gate provided at a location facing the side surface of the mold, such as the gate 141, is referred to as a side gate.
　また、光透過性樹脂材１１０は、成形条件により各部位のレーザー光の光透過度が変化し、部位によって光透過度のばらつきが大きくなるという特性がある。特に、溶融した光透過性樹脂がキャビティ内を流れる、ゲートからの流動距離が、光透過度に影響を与えている。 Further, the light transmissive resin material 110 has a characteristic that the light transmittance of the laser light at each part changes depending on the molding conditions, and the variation in the light transmittance increases depending on the part. In particular, the flow distance from the gate at which the melted light-transmitting resin flows in the cavity affects the light transmittance.
　図６Ａにおいて、光透過性樹脂材３１０のモールドのキャビティのゲート３４１は、サイドゲートである。光透過性樹脂材３１０は、サイドゲート３４１から溶融した光透過性樹脂が注入されることによって成形されている。光透過性樹脂材３１０は、１辺１１０ｍｍの正方形のレーザー光の照射面を有し、厚みが１ｍｍになるように成形されている。また、成形時の金型温度は４０℃であり、照射するレーザー光の波長は、１０５４ｎｍである。そして、光透過性樹脂材３１０のレーザー光の照射面に対して、その面の周縁に位置する正方形の経路３１１に沿ってレーザー光が照射される。 6A, the gate 341 of the mold cavity of the light transmissive resin material 310 is a side gate. The light transmissive resin material 310 is formed by injecting molten light transmissive resin from the side gate 341. The light-transmitting resin material 310 has a square laser light irradiation surface with a side of 110 mm and is formed to have a thickness of 1 mm. The mold temperature at the time of molding is 40 ° C., and the wavelength of the laser beam to be irradiated is 1054 nm. Then, the laser beam is irradiated along the square path 311 located at the periphery of the laser beam irradiation surface of the light transmissive resin material 310.
　この光透過性樹脂材３１０の正方形の経路３１１上の複数の測定点において、レーザー光の光透過度が測定されている。測定点は、正方形の経路３１１上の頂点および各辺の中点（図６ＡのＰ１，Ｐ２１，Ｐ２２，Ｐ３１，Ｐ３２，Ｐ４，Ｐ５１，Ｐ５２）である。レーザー光の光透過度の測定結果は、光透過性樹脂材の各測定点における流動距離と光透過度の相関関係として図６Ｂに示されている。ここで、光透過性樹脂材の各測定点における流動距離とは、サイドゲート３４１から成形後の光透過性樹脂材３１０の各測定点までの距離、すなわち溶融した光透過性樹脂がサイドゲート３４１から各測定点に到達するまでに流動した距離である。なお、サイドゲート３４１からＰ１、Ｐ２１（Ｐ２２）、Ｐ３１（Ｐ３２）、Ｐ４、Ｐ５１（Ｐ５２）までの距離は、それぞれ３０ｍｍ、５０ｍｍ、８０ｍｍ、１１５ｍｍ、１２０ｍｍである。 The light transmittance of the laser light is measured at a plurality of measurement points on the square path 311 of the light transmissive resin material 310. The measurement points are the vertices on the square path 311 and the midpoints of the sides (P1, P21, P22, P31, P32, P4, P51, P52 in FIG. 6A). The measurement result of the light transmittance of the laser light is shown in FIG. 6B as the correlation between the flow distance and the light transmittance at each measurement point of the light transmissive resin material. Here, the flow distance at each measurement point of the light-transmitting resin material is the distance from the side gate 341 to each measurement point of the light-transmitting resin material 310 after molding, that is, the molten light-transmitting resin is the side gate 341. It is the distance which flowed from reaching to each measurement point. The distances from the side gate 341 to P1, P21 (P22), P31 (P32), P4, and P51 (P52) are 30 mm, 50 mm, 80 mm, 115 mm, and 120 mm, respectively.
　図６Ｂに示すように、光透過性樹脂材３１０のレーザー光の光透過度は、サイドゲート３４１からの流動距離が短くなるにつれて低くなり、流動距離が長くなるにつれて高くなる。したがって、サイドゲート３４１から溶融した光透過性樹脂を注入して光透過性樹脂材３１０を成形した場合、ゲート３４１から経路３１１上の各点までの流動距離が不均一であるため、経路３１１上の各点でのレーザー光の光透過度も不均一となる。 As shown in FIG. 6B, the light transmittance of the light transmissive resin material 310 decreases as the flow distance from the side gate 341 decreases, and increases as the flow distance increases. Accordingly, when the light-transmitting resin material 310 is molded by injecting molten light-transmitting resin from the side gate 341, the flow distance from the gate 341 to each point on the path 311 is non-uniform, and thus the path 311 Also, the light transmittance of the laser light at each point becomes non-uniform.
　光透過度が不均一な経路３１１に沿ってレーザー光を照射して、光透過性樹脂材３１０と光吸収性樹脂材（図示なし）との溶着を行った場合、レーザー光の条件が一定であっても、光透過性樹脂材３１０と光吸収性樹脂材との界面における溶着強度が不均一となる。例えば、光透過度の高い箇所を基準としてレーザー光の条件を設定すると、光透過度の低い箇所では溶着強度が不十分となりリークが発生する可能性がある。したがって、この場合では経路３１１の各点によってレーザー光の条件を変更する必要がある。 When laser light is irradiated along the path 311 having non-uniform light transmittance to weld the light-transmitting resin material 310 and the light-absorbing resin material (not shown), the laser light conditions are constant. Even if it exists, the welding strength in the interface of the light transmissive resin material 310 and the light absorptive resin material will become non-uniform | heterogenous. For example, if the laser light conditions are set based on a location with a high light transmittance, the welding strength may be insufficient at a location with a low light transmittance and leakage may occur. Therefore, in this case, it is necessary to change the laser light conditions depending on each point of the path 311.
　そこで、光透過性樹脂材の各点におけるレーザー光の光透過度のばらつきを低減したレーザー溶着方法の例を示す（例えば、特許第４１９３５４１号公報）。この例では、モールドのキャビティに設けるゲートの数を増加させることで、光透過性樹脂材の各部における流動距離のばらつきを低減し、レーザー光が照射される経路上での光透過度のばらつきを低減している。また、樹脂材の結晶化度がレーザー光の透過性に影響を与えるため、光透過性樹脂材の成形時に結晶化促進剤を添加して、樹脂材全体の結晶化度を高めることで、光透過度のばらつきをさらに低減している。 Therefore, an example of a laser welding method in which variation in the light transmittance of laser light at each point of the light-transmitting resin material is reduced is shown (for example, Japanese Patent No. 4193541). In this example, by increasing the number of gates provided in the cavity of the mold, the variation in the flow distance in each part of the light transmissive resin material is reduced, and the variation in the light transmittance on the path irradiated with the laser light is reduced. Reduced. In addition, since the crystallinity of the resin material affects the laser beam transmission, a crystallization accelerator is added during molding of the light-transmitting resin material to increase the crystallinity of the entire resin material. The variation in transmittance is further reduced.
　しかし、この例のレーザー溶着方法では、複数のゲートを設ける必要があるためコストがかかり、ゲート跡を加工する箇所も増加する。さらに、ランナーに残る樹脂量が増加することによってもコストがかかる。また、結晶化促進剤を添加する回数も多くなることで、さらにコストが増加する。 However, in the laser welding method of this example, since it is necessary to provide a plurality of gates, the cost is increased and the number of gate traces increases. Further, the cost increases due to an increase in the amount of resin remaining in the runner. Further, the number of times of adding the crystallization accelerator is increased, which further increases the cost.
　本発明は、上記事由に鑑みてなされたものであり、その目的は、簡便かつ安価でレーザー光が照射されるエリア上での光透過度のばらつきを低減できる樹脂材のレーザー溶着方法および樹脂成形品を提供することにある。 The present invention has been made in view of the above-mentioned reasons, and the object thereof is a laser welding method and resin molding of a resin material that can reduce variation in light transmittance on an area irradiated with laser light simply and inexpensively. Is to provide goods.
　本発明における樹脂材のレーザー溶着方法は次の手順から成る。光透過性樹脂材を光吸収性樹脂材に重ね合わせる。そして、光透過性樹脂材と光吸収性樹脂材との間の界面に、光透過性樹脂材上の所定の照射エリアを通してレーザー光を照射することによって、この界面で光吸収性樹脂材と光透過性樹脂材とを溶着させる。本発明の樹脂材のレーザー溶着方法では、光透過性樹脂材において照射エリアでの光透過度のばらつきが小さくなるように、光透過性樹脂材を形成することを特徴とする。 The laser welding method of the resin material in the present invention includes the following procedures. The light-transmitting resin material is overlaid on the light-absorbing resin material. Then, by irradiating the interface between the light-transmitting resin material and the light-absorbing resin material with laser light through a predetermined irradiation area on the light-transmitting resin material, the light-absorbing resin material and the light at this interface are irradiated. A permeable resin material is welded. In the laser welding method of the resin material of the present invention, the light transmissive resin material is formed so that variation in light transmittance in the irradiation area in the light transmissive resin material is reduced.
　この発明は、光透過性樹脂材と光吸収性樹脂材との間の界面のうち照射エリアに対応する部分で、レーザー光が一様に照射されることで、一様にレーザー光を熱に変換することを可能にする。これによって、光透過性樹脂材と光吸収性樹脂材との均一かつ十分な溶着強度を得ることができる。したがって、本発明は、均一かつ十分な溶着強度を得るための樹脂材のレーザー溶着を簡便に行うことを可能にする。 In the present invention, the laser beam is uniformly irradiated at the portion corresponding to the irradiation area in the interface between the light-transmitting resin material and the light-absorbing resin material, so that the laser beam is uniformly heated. Allows to convert. Thereby, uniform and sufficient welding strength between the light-transmitting resin material and the light-absorbing resin material can be obtained. Therefore, the present invention makes it possible to easily perform laser welding of a resin material for obtaining uniform and sufficient welding strength.
　本発明のレーザー溶着方法では、この照射エリアが光透過性樹脂材の周縁に設定されることが好ましい。 In the laser welding method of the present invention, this irradiation area is preferably set at the periphery of the light-transmitting resin material.
　これにより、光透過性樹脂材と光吸収性樹脂材との間の周縁部における溶着強度のばらつきを低減できる。 Thereby, it is possible to reduce the variation in the welding strength at the peripheral portion between the light-transmitting resin material and the light-absorbing resin material.
　さらに、本発明のレーザー溶着方法は次の手順から成ることが好ましい。光透過性樹脂材は溶融した光透過性樹脂をモールド内のキャビティに注入して硬化させることで成形される。照射エリアは、成形された光透過性樹脂材の周縁の全周に及び、光透過性樹脂材の周縁部から離れた中心部に対応する位置に設けたゲートを介して光透過性樹脂をキャビティに注入する。これにより、光透過性樹脂材と光吸収性樹脂材との間の周縁部における溶着強度のばらつきをさらに低減できる。 Furthermore, the laser welding method of the present invention preferably comprises the following procedure. The light transmissive resin material is molded by injecting molten light transmissive resin into a cavity in the mold and curing it. The irradiation area is the entire circumference of the periphery of the molded light-transmitting resin material, and the light-transmitting resin is cavityd through a gate provided at a position corresponding to the central portion away from the periphery of the light-transmitting resin material. Inject. Thereby, the dispersion | variation in the welding strength in the peripheral part between a light transmissive resin material and a light absorptive resin material can further be reduced.
　さらに、本発明のレーザー溶着方法において、ゲートはピンゲートであることが好ましい。ピンゲートを用いることによって、成形工程の中でゲートの樹脂は自動的に切断されるため、ゲートの樹脂を切断する工程が必要なく、コストを下げることができる。 Furthermore, in the laser welding method of the present invention, the gate is preferably a pin gate. By using the pin gate, the resin of the gate is automatically cut in the molding process, so that the process of cutting the resin of the gate is not necessary, and the cost can be reduced.
　さらに、本発明のレーザー溶着方法において、ゲートはダイレクトゲートであることが好ましい。ダイレクトゲートを採用することによって、キャビティ加工が容易となるため、コストを下げることができる。 Furthermore, in the laser welding method of the present invention, the gate is preferably a direct gate. By adopting the direct gate, the cavity processing becomes easy, so the cost can be reduced.
　さらに、本発明のレーザー溶着方法において、ゲートはトンネルゲートであることが好ましい。これにより、成形後に生じるゲート跡を目立たなくすることができる。さらに、本発明の上述のレーザー溶着方法により、樹脂成形品が形成されることが好ましい。 Furthermore, in the laser welding method of the present invention, the gate is preferably a tunnel gate. Thereby, the gate trace which arises after shaping | molding can be made inconspicuous. Furthermore, it is preferable that a resin molded product is formed by the above laser welding method of the present invention.
本発明で得られる成形品の概略構成図である。It is a schematic block diagram of the molded article obtained by this invention. 同上の成形品の上面図である。It is a top view of a molded product same as the above. 本発明で用いられるモールドの上面図である。It is a top view of the mold used by this invention. 図３Ａに示すモールドのＡ－Ａ断面図である。FIG. 3B is a cross-sectional view taken along line AA of the mold shown in FIG. 3A. レーザー光を照射するときの従来の樹脂材の概略構成図である。It is a schematic block diagram of the conventional resin material when irradiating a laser beam. 溶着部が形成されたときの従来の樹脂材の概略構成図である。It is a schematic block diagram of the conventional resin material when a welding part is formed. 従来の成形品の概略構成図である。It is a schematic block diagram of the conventional molded article. 光透過性樹脂材における光透過度の測定点を示す。The measurement point of the light transmittance in a light transmissive resin material is shown. 流動性樹脂材の流動距離と光透過度の相関関係を示す。The correlation of the flow distance and light transmittance of a fluid resin material is shown.
　以下、本発明の実施の形態を図面に基づいて説明する。なお、上下左右前後方向は図１に示された通りである。本実施形態では、レーザー光３０は上下方向に沿って照射されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the vertical and horizontal directions are as shown in FIG. In the present embodiment, the laser beam 30 is irradiated along the vertical direction.
　本実施形態の樹脂材のレーザー溶着方法では、例えば図１に示されるように、光吸収性樹脂材２０から形成される本体と、光透過性樹脂材１０から形成される蓋とで構成されるケース１が用いられる。光透過性樹脂材１０の上面の所定の照射エリア（本実施形態における経路１１）に沿ってレーザー光３０を照射することで、光透過性樹脂材１０と光吸収性樹脂材２０とを溶着することができる。 In the laser welding method of the resin material of this embodiment, for example, as shown in FIG. 1, the resin material is composed of a main body formed of a light-absorbing resin material 20 and a lid formed of a light-transmitting resin material 10. Case 1 is used. The light transmitting resin material 10 and the light absorbing resin material 20 are welded by irradiating the laser light 30 along a predetermined irradiation area (the path 11 in the present embodiment) on the upper surface of the light transmitting resin material 10. be able to.
　光吸収性樹脂材２０は上面が開口した箱状に形成され、光透過性樹脂材１０は正方形の板状に形成されている。そして、光吸収性樹脂材２０の開口を覆うように、光吸収性樹脂材２０の上部に光透過性樹脂材１０が配置される。そして、光吸収性樹脂材２０の開口周縁に位置する上面と光透過性樹脂材１０の下面との界面に向けて、正方形の光透過性樹脂材１０の上面周縁に形成された経路１１に沿ってレーザー光３０を照射することで、光透過性樹脂材１０と光吸収性樹脂材２０が溶着される。本実施形態での経路１１は、前後方向および左右方向に平行な辺を有する正方形になっている。 The light-absorbing resin material 20 is formed in a box shape having an upper surface opened, and the light-transmitting resin material 10 is formed in a square plate shape. Then, the light-transmitting resin material 10 is disposed on the light-absorbing resin material 20 so as to cover the opening of the light-absorbing resin material 20. Then, along the path 11 formed at the upper surface periphery of the square light-transmitting resin material 10 toward the interface between the upper surface located at the opening periphery of the light-absorbing resin material 20 and the lower surface of the light-transmitting resin material 10. By irradiating the laser beam 30, the light-transmitting resin material 10 and the light-absorbing resin material 20 are welded. The path 11 in the present embodiment is a square having sides parallel to the front-rear direction and the left-right direction.
　光透過性樹脂材１０は、例えばポリプチレンテレフタレート（ Ｐ Ｂ Ｔ ） 、ポリエチレンテレフタレート（ Ｐ Ｅ Ｔ ） 等のポリエステル樹脂、ポリエチレン、ポリプロピレン等のポリオレフィン樹脂、ポリアミド樹脂、塩化ビニル樹脂、フッ素樹脂等から形成される。 The light-transmitting resin material 10 is made of, for example, polyester resin such as polyethylene terephthalate (P B T), polyethylene terephthalate (P E T), polyolefin resin such as polyethylene and polypropylene, polyamide resin, vinyl chloride resin, fluorine resin, and the like. Is done.
　光透過性樹脂材１０のモールド４０のキャビティ４２は、正方形の板状の空間で形成されており、光透過性樹脂材１０の上面における、正方形に形成されたレーザー光３０の経路１１内の領域の中心１２に対向する位置にゲート４１が設けられている。そして、光透過性樹脂材１０は、モールド４０のキャビティ４２に設けられたゲート４１から、溶融した光透過性樹脂が注入されることによって成形される。また、ゲート４１の位置を、中心１２に対向する位置に設けることによって、溶融した光透過性樹脂は、中心１２から同心円状に拡がっていく。したがって、成形された光透過性樹脂材１０は、中心１２から外周縁に向かって流動距離が長くなっていく。図２に、流動距離の等距離線１３を一点鎖線で示す。 The cavity 42 of the mold 40 of the light transmissive resin material 10 is formed in a square plate-like space, and the region in the path 11 of the laser light 30 formed in a square shape on the upper surface of the light transmissive resin material 10. A gate 41 is provided at a position facing the center 12. The light transmissive resin material 10 is molded by injecting molten light transmissive resin from the gate 41 provided in the cavity 42 of the mold 40. Further, by providing the gate 41 at a position facing the center 12, the melted light-transmitting resin spreads concentrically from the center 12. Therefore, the molded light-transmitting resin material 10 has a longer flow distance from the center 12 toward the outer periphery. In FIG. 2, the equidistant line 13 of a flow distance is shown with a dashed-dotted line.
　光透過性樹脂材１０におけるレーザー光３０の光透過度は、ゲート４１からの流動距離に依存する。上述したように流動距離が長いほど光透過度も大きくなるので、光透過性樹脂材１０の上面の周縁に近くなるほど光透過度が高くなっている。また、流動距離が等しい点では光透過度も等しくなる。光透過性樹脂材１０の上面の周縁は流動距離が等しくなっているので、光透過度も等しくなっている。したがって、光透過性樹脂材１０の上面の経路１１は周縁に形成されているので、この経路上での光透過度はばらつきがほとんどなく、均一であるとみなされる。なお、本実施形態のようにレーザー光１０３の経路１３が正方形の場合、例えば経路１３を構成する辺の中点１４と頂点１５では、流動距離に差が生じている。しかし、本実施形態では、この流動距離の差は無視できる程度に小さく、中点１４と頂点１５における光透過度の差も無視できる程度に小さい。したがって、レーザー光３０が照射される経路１１上では、レーザー光の光透過度は均一であると見なされる。 The light transmittance of the laser light 30 in the light transmissive resin material 10 depends on the flow distance from the gate 41. As described above, the longer the flow distance, the greater the light transmittance. Therefore, the closer to the periphery of the upper surface of the light transmissive resin material 10, the higher the light transmittance. Further, at the same flow distance, the light transmittance is also equal. Since the peripheral distance of the upper surface of the light transmissive resin material 10 has the same flow distance, the light transmittance is also equal. Therefore, since the path 11 on the upper surface of the light transmissive resin material 10 is formed at the periphery, the light transmittance on this path is considered to be uniform with little variation. Note that when the path 13 of the laser beam 103 is square as in the present embodiment, for example, there is a difference in flow distance between the midpoint 14 and the apex 15 of the side constituting the path 13. However, in this embodiment, this difference in flow distance is so small that it can be ignored, and the difference in light transmittance between the midpoint 14 and the vertex 15 is so small that it can be ignored. Therefore, the light transmittance of the laser light is considered to be uniform on the path 11 where the laser light 30 is irradiated.
　したがって、上記の方法で成形された光透過性樹脂材１０と光吸収性樹脂材２０を重ね合わせて、その界面に向けてレーザー光３０を同一条件で照射すれば、経路１１上の光透過度は均一なので、光透過性樹脂材１０と光吸収性樹脂材２０との間の溶着強度のばらつきを最小限にできる。 Therefore, if the light-transmitting resin material 10 and the light-absorbing resin material 20 molded by the above method are overlapped and irradiated with the laser light 30 toward the interface under the same conditions, the light transmittance on the path 11 is determined. Since it is uniform, the dispersion | variation in the welding strength between the light transmissive resin material 10 and the light absorptive resin material 20 can be minimized.
　また、ゲート４１をピンゲートで構成することによって、光透過性樹脂材１０の成形工程の中でゲート４１の樹脂は自動的に切断されるため、ゲート４１の樹脂を切断する工程が必要なく、コストを下げることができる。また、ゲート４１をダイレクトゲートで構成すると、モールドのキャビティにゲート４１を設けるための加工が容易となるため、コストを下げることができる。また、ゲート４１をトンネルゲートで構成すると、光透過性樹脂材１０の成形後に生じるゲート跡を目立たなくすることができる。 Further, since the gate 41 is constituted by a pin gate, the resin of the gate 41 is automatically cut in the molding process of the light-transmitting resin material 10, so that the process of cutting the resin of the gate 41 is not necessary, and the cost is reduced. Can be lowered. Further, when the gate 41 is constituted by a direct gate, the processing for providing the gate 41 in the mold cavity becomes easy, so that the cost can be reduced. In addition, when the gate 41 is constituted by a tunnel gate, the gate trace generated after the molding of the light transmissive resin material 10 can be made inconspicuous.

Claims (7)

  1. 　光透過性樹脂材を、光吸収性樹脂材に重ね合わせ、
    　上記光透過性樹脂材と上記光吸収性樹脂材との間の界面に、上記光透過性樹脂材上の所定の照射エリアを通してレーザー光を照射して、上記界面で光吸収性樹脂材と上記光透過性樹脂材とを溶着させる樹脂成形品のレーザー溶着方法であって、
    　上記光透過性樹脂材において上記照射エリアでの光透過度のばらつきが小さくなるように、上記光透過性樹脂材を形成することを特徴とする樹脂材のレーザー溶着方法。     Overlay the light-transmitting resin material on the light-absorbing resin material,
    The interface between the light-transmitting resin material and the light-absorbing resin material is irradiated with laser light through a predetermined irradiation area on the light-transmitting resin material, and at the interface, the light-absorbing resin material and the above-mentioned A laser welding method of a resin molded product for welding a light transmissive resin material,
    A laser welding method for a resin material, wherein the light transmissive resin material is formed so that variation in light transmittance in the irradiation area is reduced in the light transmissive resin material.
  2. 　上記照射エリアが上記光透過性樹脂材の周縁に設定されることを特徴とする請求項１に記載の樹脂材のレーザー溶着方法。 The laser welding method for a resin material according to claim 1, wherein the irradiation area is set at a periphery of the light-transmitting resin material.
  3. 　上記光透過性樹脂材は溶融した光透過性樹脂をモールド内のキャビティに注入して硬化させることで成形され、
    　上記の照射エリアは、成形された上記光透過性樹脂部材の周縁の全周に及び、
    　上記光透過性樹脂材の周縁部から離れた中心部に対応する位置に設けたゲートを介して上記光透過性樹脂を上記キャビティに注入することを特徴とする請求項２に記載の樹脂材のレーザー溶着方法。     The light transmissive resin material is molded by injecting a molten light transmissive resin into a cavity in a mold and curing it,
    The irradiation area extends to the entire periphery of the periphery of the molded light transmissive resin member,
    3. The resin material according to claim 2, wherein the light transmissive resin is injected into the cavity through a gate provided at a position corresponding to a central portion away from a peripheral edge of the light transmissive resin material. Laser welding method.
  4. 　上記ゲートは、ピンゲートであることを特徴とする請求項３に記載の樹脂材のレーザー溶着方法。 4. The method for laser welding a resin material according to claim 3, wherein the gate is a pin gate.
  5. 　上記ゲートは、ダイレクトゲートであることを特徴とする請求項３に記載の樹脂材のレーザー溶着方法。 4. The method for laser welding a resin material according to claim 3, wherein the gate is a direct gate.
  6. 　上記ゲートは、トンネルゲートであることを特徴とする請求項３に記載の樹脂材のレーザー溶着方法。 4. The method for laser welding a resin material according to claim 3, wherein the gate is a tunnel gate.
  7. 　クレーム１乃至６のいずれかの方法によって製造された樹脂成形品。 Resin molded product manufactured by any one of claims 1 to 6.
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