Apparatus for producing double-walled corrugated pipes

Details Apparatus for producing double-walled corrugated pipes Apparatus for producing double-walled corrugated pipes

B - Operations, Transporting

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B29C 47/06 (2006.01) B29C 53/58 (2006.01) B29C 53/82 (2006.01) B29C 53/84 (2006.01) B29C 63/32 (2006.01) B29D 23/18 (2006.01)

Patent

CA 1226710

Page 10 ABSTRACT OF THE DISCLOSURE An apparatus for producing helically wound double-walled fused thermoplastic pipes, corrugated outside and smooth inside. The apparatus includes extrude means forming two bands of a thermoplastic material, a former shaping the corrugated configuration of and helically winding the first extruded band, a cooled element pressing the second band to the inside of the corrugations and having passages communicating with the second band and with a vacuum means.

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