METHOD FOR MANUFACTURING RESIN TUBE HAVING EXCELLENT SHAPE MEMORY PROPERTIES AND INNER SURFACE RESIN LINING STEEL TUBE USING THE RESIN TUBE

Title:

METHOD FOR MANUFACTURING RESIN TUBE HAVING EXCELLENT SHAPE MEMORY PROPERTIES AND INNER SURFACE RESIN LINING STEEL TUBE USING THE RESIN TUBE

Document Type and Number:

Japanese Patent JP2002234067

Kind Code:

A

Abstract:

To provide a method for manufacturing a resin tube having excellent shape memory characteristics.

The method for manufacturing the resin tube having the excellent shape memory characteristics comprises the steps of extruding a thermoplastic resin from a double annular die by an extruder to a tubular element, thereafter contacting an outside of the element with an inside of a tapered sizing die attached to an input side of a vacuum cooling tank where cooling water is injected in a shower state, and passing the element therethrough. The element arrives at a tapered part before the element is sufficiently solidified, radially contracted or enlarged while being cooled to impart a residual stress necessary for the shape memory properties, and its outer diameter is fixed at a parallel part of the element.

Inventors:

KOBAYASHI MASATOSHI
SUGAWARA KEIJI
HARADA YASUHIRO
FURUTA AKIHIKO

Application Number:

JP2001035910A

Publication Date:

August 20, 2002

Filing Date:

February 13, 2001

Export Citation:

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Assignee:

NIPPON KOKAN KK

International Classes:

B29C48/90; B29C63/26; B29C63/42; (IPC1-7): B29C47/90; B29C63/26; B29C63/42

Attorney, Agent or Firm:

Takehiko Suzue (4 outside)

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