Invention Application
WO2014060750A1 DOUBLE-WALLED DUCT AND EXTRUDER THEREFOR 审中-公开
双层排水管及其挤出机

DOUBLE-WALLED DUCT AND EXTRUDER THEREFOR
Abstract:
A duct (1) comprising a first conduit (2), a second conduit (3) disposed annularly around the first conduit (2), and a support structure (4) integrally formed with and connecting the first conduit (2) to the second conduit (3) and extending helically along the duct. Also, an extruder (10) for forming the duct (1).
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