METHOD FOR MANUFACTURING RESIN PIPE

WIPO Patent Application WO/2020/110369

A1

Provided is a method capable of more simply manufacturing a resin pipe that does not have a step difference in an annular groove in the outer peripheral surface thereof, the difference caused by the parting line of a mold, by using a gas-assisted molding method or the like. In the present invention: a holding part 3a, which has a larger diameter than a cavity 3, is formed, in a state of communicating with the cavity 3, within a range including a portion corresponding to an annular groove 8a of bi-split-type molds 2a, 2b; a cylindrical insert member 8 including, in the outer peripheral surface, the annular groove 8a, having no step difference on the surface thereof, being fitted to the holding part 3a to close the molds 2a, 2b; a surface treated layer 9, which has a larger surface roughness than other portions, is formed on the inner peripheral surface of the insert member 8; an assisting material 5 is injected into the cavity 3 after injecting a molten resin 4 into the cavity 3 to mold the resin 4 into a desired pipe body 7; and the resin 4 is cured, and the insert member 8 and the pipe body 7 are integrated.

JPH078519	[Title of Invention] Method for manufacturing molded product
WO/2012/126849	PRE-FORMED HEAD OF A CONTAINER
JP5901919	Cage for rolling bearings

KURIBAYASHI NOBUAKI (JP)

PCT/JP2019/029450

June 04, 2020

July 26, 2019

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YOKOHAMA RUBBER CO LTD (JP)

B29C45/14; B29C33/14; B29C45/37; B29D23/00

WO2017203896A1

2017-11-30

JPH10113953A	1998-05-06
JP2012153086A	2012-08-16
JPH07299838A	1995-11-14
US20030131853A1	2003-07-17
JP2003181868A	2003-07-02
JP2011033158A	2011-02-17

SEIRYU PATENT PROFESSIONAL CORPORATION et al. (JP)

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