Apparatus for producing double-walled corrugated pipes

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

1987-04-23

1988-03-15

Simmons, David

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

Longitudinally progressive helical winding means

156195, 156210, 15624415, 156285, 156498, 156500, 264508, B65H 8100

Patent

active

047311380

ABSTRACT:
An apparatus for producing helically wound double-walled fused thermoplastic pipes, corrugated outside and smooth inside. The apparatus includes extruder 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.

REFERENCES:
patent: 3816204 (1974-06-01), Nagayoshi

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