Patent ID: 6312543
Filing Date: 2001-11-06
Classification: B29C,B29D,B29K,B29L,B32B,Y10T

Abstract:
A process for producing a tubular article, comprising:winding a first thermoplastic sheet film on a cylindrical member with a wind-starting portion and a wind-ending portion thereof overlapped;placing a metal outside the above wound film either (a) by winding a metal sheet having sheet ends with both of the sheet ends thereof abutted, or (b) by fitting a metal tube;winding a second thermoplastic sheet film on the metal tube or the metal sheet with a wind-starting portion and a wind-ending portion thereof overlapped;fitting a tubular member outside the above wound second thermoplastic sheet film; andheating at least the first and second thermoplastic films to bond the overlapped portions of the thermoplastic sheet films to complete a three-layered tubular article,wherein the cylindrical member has a thermal expansion coefficient larger than that of the tubular member, andwherein the metal comprises one of a metal mesh and a punched metal sheet.