B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
189/45, 18/741
B29C 47/20 (2006.01)
Patent
CA 2001703
ABSTRACT The invention concerns double walled corrugated thermoplastic tube and apparatus for making it. Such tube is formed with intermittant bonds between the corrugations of the outer corrugated tube and the inner tube to provide for increased flexibility of the tube either over its whole length or in preferred directions. Thus by bonding the tubes together along one line parallel to the axis, it may be possible to produce a tube which is more easily coilable.
Corma Inc.
Lupke Gerd P.h.
Parsons Jane
LandOfFree
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