Title:
APPARATUS FOR MANUFACTURING FOAMED RESIN TUBE AND FOAMED RESIN TUBE
Document Type and Number:
WIPO Patent Application WO/2018/124213
Kind Code:
A1
Abstract:
Provided is an apparatus for manufacturing a foamed resin tube with which a high-foam-content foamed resin tube that has a surface embossed with protrusions and recesses can be manufactured at high yields with few steps with minimal distortion in the cross-sectional shape. A first resin containing a foaming agent is supplied to a first flow channel 35 of a die 2. A second resin having a higher temperature than the first resin is supplied to a second flow channel 36. A thermal insulation layer provided inside dies 31 suppresses heating of the first resin by the second resin, and keeps the temperature of the first resin in the temperature range required to yield a high foam content. A high-foam-content foamed resin tube having an embossed profile is manufactured by performing the following simultaneously within a mold: extrusion of the first resin, which includes the foaming agent; extrusion of the second resin; and molding of the resins.
Inventors:
KIKUZAWA YOSHIHARU (JP)
Application Number:
PCT/JP2017/047037
Publication Date:
July 05, 2018
Filing Date:
December 27, 2017
Export Citation:
Assignee:
PLA GIKEN CO LTD (JP)
International Classes:
B29C44/00; B29C48/09; B29C48/13; B29C48/32; B29C48/335; B29C48/90; B29C59/02; F16L11/12; F16L59/147; B29C48/885
Foreign References:
| JPH1058539A | 1998-03-03 | |||
| JPH09117967A | 1997-05-06 | |||
| JP2008012821A | 2008-01-24 | |||
| JPH09267405A | 1997-10-14 | |||
| JPH09109279A | 1997-04-28 | |||
| JP2016106043A | 2016-06-16 | |||
| JP2002331570A | 2002-11-19 | |||
| JPH0939113A | 1997-02-10 |
Attorney, Agent or Firm:
OGASAWARA PATENT OFFICE (JP)
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