Title:
PRODUCTION METHOD AND DEVICE FOR CURVED RESIN PIPE
Document Type and Number:
WIPO Patent Application WO/2023/135848
Kind Code:
A1
Abstract:
The present invention provides a production method and device for a curved resin pipe which make it possible to more reliably correct thickness deviations in a curved section when producing a curved resin pipe via resin injection molding that uses an assist material. An inner curve part 14a and/or an outer curve part 14b of a pre-selected curved section 12 of a cavity 11 which is formed in a mold 10 is configured from a temperature-adjustable piece section 15. After molten resin R is injected into the cavity 11 from an injection molding device 8, the temperature of the piece section 15 is controlled by a control unit 17 such that the inner curve part 14a has a lower temperature than the outer curve part 14b, and an assist material S is injected into the cavity 11 from an assist material injection unit 9 and is passed through the cavity 11 so as to form a pipe path 1a. The resin R remaining in the cavity 11 is cured to produce a curved resin pipe 1.
Inventors:
KURIBAYASHI NOBUAKI (JP)
Application Number:
PCT/JP2022/031503
Publication Date:
July 20, 2023
Filing Date:
August 22, 2022
Export Citation:
Assignee:
YOKOHAMA RUBBER CO LTD (JP)
International Classes:
B29C45/73; B29C33/02; B29C33/38; B29C33/42; B29C45/37; B29C45/78; B29D23/00; F16L9/127
Foreign References:
| JPH07164465A | 1995-06-27 | |||
| JP2012025090A | 2012-02-09 | |||
| JPH08281690A | 1996-10-29 | |||
| JPH10296733A | 1998-11-10 | |||
| JPH11309740A | 1999-11-09 | |||
| JPH07299838A | 1995-11-14 | |||
| JP2020082622A | 2020-06-04 | |||
| JP2021084375A | 2021-06-03 | |||
| JP2017154477A | 2017-09-07 |
Attorney, Agent or Firm:
SEIRYU PATENT PROFESSIONAL CORPORATION et al. (JP)
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