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Two-color molding method and two-color molded article

A two-color molding, resin part technology, applied in the direction of layered products, applications, lighting and heating equipment, etc., can solve problems such as the deterioration of the appearance quality of the front cover, and achieve the effect of preventing the deterioration of the appearance quality and suppressing the deformation of the shape

Inactive Publication Date: 2015-11-04
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The appearance quality of the molded front cover deteriorates

Method used

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  • Two-color molding method and two-color molded article
  • Two-color molding method and two-color molded article
  • Two-color molding method and two-color molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is an external perspective view of an embodiment in which the two-color molded product of the present invention is applied to a front cover of a headlight disposed at the front of a vehicle body. Left and right headlights HL are disposed on the front portion of the body BD of the automobile CAR. figure 2 is along figure 1 An enlarged cross-sectional view of the II-II line of the middle right headlight HL, omitting partial illustrations, the lampshade 1 containing the lamp unit LU that emits light controlled to a desired light distribution is composed of a container-shaped lamp body 2 with an open front and The front cover 3 attached to the front opening of this lamp body 2 is comprised. The front cover 3 is produced by the two-color molding method of the present invention.

[0048] figure 2Among them, the front cover 3 is integrally formed of a transpare...

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PUM

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Abstract

Provided are a two-color molding method, and a two-color molded article capable of suppressing deterioration of the appearance quality which is caused by resin shrinkage or resin deformation in the two-color molding. The two-color molding method includes: molding a first resin portion by a common die and a primary die; and molding a second resin portion integrally with the first resin portion by the common die and a secondary die. An abutting portion is molded on an edge of the first resin portion to protrude toward the secondary die when the first resin portion is molded, and a distal end surface of the abutting portion is maintained to be abutted on a cavity surface or a parting surface of the secondary die when the second resin portion is molded. The deformation of the abutting portion or the first resin portion is suppressed to suitably mold the second resin portion.

Description

technical field [0001] The present invention relates to a technique of integrally molding different resins, that is, two-color molding, and particularly relates to a two-color molding method suitable for manufacturing a light-transmitting body, one of constituent elements of a lamp, and a two-color molded product formed by the two-color molding method. Background technique [0002] In lamps such as headlights of automobiles, the front cover of the lampshade of the built-in lamp unit is formed of light-transmitting resin, and the light emitted from the lamp unit is transmitted through the front cover, and the area in front of the vehicle is illuminated by the required light distribution. . The light-transmitting area of ​​the front cover, that is, the effective part is formed only by translucent resin, and the ineffective part that cannot contribute to light distribution is formed by colored non-translucent resin, which is optically shielded inside the lampshade and cannot be...

Claims

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Application Information

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IPC IPC(8): B29C45/16F21S8/10F21V3/04F21W101/10
CPCB32B3/04B29D11/0073B29K2101/00B29K2995/0026B32B2605/00B60Q1/04F21S41/20B29C45/16B29K2995/0025B29C45/0025B29C2045/1682F21S41/28B29C45/0062B29C45/1615B29C45/1679B29C2045/0089B29C45/1816B29C45/1676B29C45/1866B29C45/1675
Inventor 伊藤宏弥
Owner KOITO MFG CO LTD