Flexible duct with shrinkage-proof film

Details Flexible duct with shrinkage-proof film Flexible duct with shrinkage-proof film

2005-01-18

2005-01-18

Brinson, Patrick (Department: 3752)

Pipes and tubular conduits

Flexible

Spirally wound material

C138S131000, C138S135000, C138S127000, C138S139000

Reexamination Certificate

active

06843278

ABSTRACT:
The invention concerns a flexible duct (1) comprising from inside outwards a carcass (2) produced by a short-pitched metallic helical winding forming butt gaps (12), an overlapping layer (10) acting as a heat shield consisting of helically wound plastic strips (10a, 10b), a sealed inner pressure sheath (3), extruded in plastic on said overlapping layer (10), at least an armouring web (5) and at least an outer sealing sheath (7). The invention is characterised in that the overlapping strips (10a, 10b) are wound at a winding angle less than 35°.

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