Title:
EXTRUSION FORMING APPARATUS FOR RESIN-MADE MULTILAYER PIPE
Document Type and Number:
WIPO Patent Application WO/2008/004329
Kind Code:
A1
Abstract:
In the forming of inside and outside pipes of a multilayer pipe by thermal melting
of first and second resins of different types, there can be realized inside and
outside pipes of a multilayer pipe both having desirable material quality and
desirable precision. Extrusion forming apparatus (1) includes first and second
extruders (10,11) for separately extruding of first and second resins (8,9)
of different types; die (12) provided with not only inside channel (31) for allowing
the first resin (8) to pass therethrough to thereby attain forming of inside pipe
(4) but also outside channel (37) for allowing the second resin (9) to pass therethrough
to thereby attain forming of outside pipe (5) externally fitted on the inside
pipe (4) so that multilayer pipe (2) is formed by the inside and outside pipes (4,5);
and heater (13) for heating the die (12). The heater (13) is equipped with first
heater (42) for heating part (12a) of the die (12) provided with at least part of
the inside channel (31) and second heater (43) for heating other part (12b) of
the die (12) provided with at least part of the outside channel (37) independently
from the first heater (42).
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Inventors:
KIKUSAWA YOSHIHARU (JP)
Application Number:
PCT/JP2007/000275
Publication Date:
January 10, 2008
Filing Date:
March 20, 2007
Export Citation:
Assignee:
PLA GIKEN CO LTD (JP)
KIKUSAWA YOSHIHARU (JP)
KIKUSAWA YOSHIHARU (JP)
International Classes:
B29C48/09; B29C48/32
Foreign References:
| JP2001517158A | 2001-10-02 | |||
| JPS565750A | 1981-01-21 | |||
| JPS4977962A | 1974-07-26 | |||
| JP2002331569A | 2002-11-19 | |||
| JP2002331570A | 2002-11-19 | |||
| JPS5761524A | 1982-04-14 | |||
| JPS53129251A | 1978-11-11 |
Attorney, Agent or Firm:
SAWADA, Tadao (Sanei Bldg.20-9, Toyosaki 3-chome,Kita-ku, Osaka-shi, Osaka, JP)
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