Resin molded article and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-11345136-B2
Application number	US-202016996954-A
Country	US
Kind code	B2
Filing date	Aug 19, 2020
Priority date	Aug 23, 2019
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A resin molded article is equipped with a resin base material layer, a cover layer, and a design layer. The design layer is provided on a design side end surface of the resin base material layer, whereas the cover layer is provided on a cover side end surface which is a rear surface of the design side end surface. Further, the cover layer includes a first end surface facing toward the cover side end surface, and a second end surface which is a rear surface of the first end surface. The first end surface is covered by a first coating layer, and the second end surface is covered by a second coating layer.

First claim

What is claimed is:

1. A method of manufacturing a resin molded article comprising:
a resin base material layer made from an ultraviolet curable resin, and having a cover side end surface and a design side end surface forming a rear surface of the cover side end surface;
a cover layer made from a polymer membrane, and provided on the cover side end surface of the resin base material layer; and
a design layer provided on the design side end surface of the resin base material layer and configured to be visible through the cover layer;
the method of manufacturing the resin molded article comprising:
an introduction step of introducing an ultraviolet curable resin into a mold having an upper end which is an open end, to thereby obtain a precursor of the resin base material layer;
a coating step of coating a first end surface of the cover layer made from polymer membrane with a first coating layer, while coating a second end surface forming a rear surface of the first end surface with a second coating layer;
a placement step of placing the cover layer on an end surface of the precursor that is accommodated in the mold and faces toward the open end, in a manner so that the first coating layer is positioned on a lower side, and the second coating layer is positioned on an upper side;
a leveling step of pressing the precursor on which the cover layer has been placed, through the cover layer, and leveling the end surface that faces toward the open end;
a curing step of applying ultraviolet rays to the precursor to harden the precursor, and obtaining the resin base material layer on which the cover layer is provided on the cover side end surface; and
a design layer producing step of providing the design layer on the design side end surface forming a rear surface of the cover side end surface of the resin base material layer,
wherein a thickness of one of the first coating layer and the second coating layer lies within a range of 2 to 10 μm, and a thickness of a remaining one thereof lies within a range of 1 to 5 μm, and
wherein the thickness of the first coating layer is set to be less than the thickness of the second coating layer, and the thickness of the first coating layer is set to be greater than or equal to half the thickness of the second coating layer.

2. The method of manufacturing the resin molded article according to claim 1 , wherein a thickness of the cover layer lies within a range of 150 to 200 μm.

3. The method of manufacturing the resin molded article according to claim 1 , wherein
the resin base material layer, the first coating layer, the second coating layer and the cover layer are capable of transmitting light, and the design layer exhibits an opaque color, and
in the curing step, the cover layer adheres to the resin base material layer through the first coating layer.

Assignees

• Honda Motor Co Ltd
• Continental Automotive Gmbh
• Sunarrow Ltd

Inventors

• Lee Seonghun
• Sato Ryo
• Kiyomiya Tomoomi
• Hyun Youngjin
• Takahata Takezo

Classifications

• B32B2451/00

  Decorative or ornamental articles · CPC title

• B32B37/1054

  Regulating the dimensions of the laminate, e.g. by adjusting the nip or platen gap · CPC title

• B29C35/0805 Primary

  using electromagnetic radiation · CPC title

• E05B19/00

  Keys; Accessories therefor ({key modifications or attachments preventing removal from the lock E05B11/005; key rings A44B15/00; key cases A45C11/32; key holders A47G29/10;} making keys, see the relevant places, e.g. B21D53/42; milling grooves in keys B23C3/35) · CPC title

• B32B37/15 Primary

  with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state · CPC title