Title:
METHOD FOR PRODUCING RESIN FOAM BOARD
Document Type and Number:
WIPO Patent Application WO/2021/095727
Kind Code:
A1
Abstract:
Provided is a method for producing a resin foam board, which makes it possible to reduce easily the weight, efficiently make the size of bubbles substantially uniform, and improve the strength while using a physical foaming agent of an inactive gas. The method comprises a step of putting pellets P of a resin of an engineering plastic and/or a super engineering plastic into an extruder used for variable-shape extrusion molding, a step of heating and melting the resin to generate a molten resin M, a step of injecting a physical foaming agent of an inactive gas G into the molten resin M and mixing, and a step of extruding the molten resin (foamed resin material F) mixed with the inactive gas G from a die and foam-molding. The die 6 molds the molten resin mixed with the inactive gas into a plate shape having two or more holes extending substantially parallel to each other along the extrusion direction.
Inventors:
MIZUTANI KEI (JP)
GOTO TOSHIHARU (JP)
YUSA ATSUSHI (JP)
GOTO TOSHIHARU (JP)
YUSA ATSUSHI (JP)
Application Number:
PCT/JP2020/041912
Publication Date:
May 20, 2021
Filing Date:
November 10, 2020
Export Citation:
Assignee:
MAXELL HOLDINGS LTD (JP)
International Classes:
C08J9/12; B29C44/00; B29C48/11
Foreign References:
| JP2008127872A | 2008-06-05 | |||
| JP2000263624A | 2000-09-26 | |||
| JPH10272670A | 1998-10-13 | |||
| JPH0957811A | 1997-03-04 |
Attorney, Agent or Firm:
UEBA, Hidetoshi et al. (JP)
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