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Title:
MULTIILAYER THERMOPLASTIC TUBE
Document Type and Number:
Japanese Patent JPS5439481
Kind Code:
A
Abstract:
A thermoplastic pipe, particularly one having an expanded core is produced by extruding a cylindrical stream of thermoplastic material, converting the cylindrical stream to an annular stream, applying at least one inner annular layer of thermoplastic to the inner surface of the annular stream, applying at least one outer annular layer of thermoplastic material to the annular stream, and extruding the resultant multiple-layered annular stream. The apparatus for producing the multiple-layered pipe includes a modular pipe die having inside and outside laydown means 51, 53, a flow equalizing groove within the die to obviate layer imperfections, and adjustable means 61 to control the concentricity of the outer layers.

Inventors:
EDOWAADO HAATO
RAREI ENU RUTORETSUJI
Application Number:
JP7876478A
Publication Date:
March 26, 1979
Filing Date:
June 30, 1978
Export Citation:
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Assignee:
COSDEN TECHNOLOGY
International Classes:
B32B5/18; B29B7/00; B29C47/00; B29C47/06; B29C47/56; B29C48/32; B29C48/325; B29C48/335; B29C48/90; (IPC1-7): B29D23/04; B29D27/00; B32B5/18



 
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