Flexible duct with shrinkage-proof film
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United States of America Patent
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Jan 18, 2005
Grant Date -
Apr 1, 2004
app pub date -
Aug 13, 2003
filing date -
Feb 22, 2001
priority date (Note) -
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status (Latency Note)
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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.degree..
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