PVC drainage or ventilation hose for installation in motor bodies

摘要

Hose installed in motor vehicle body for drainage or ventilation is of PVC or similar thermoplastic and has thin-wall fins (12) co-extruded with the hose body (11), to which they are fuse-bonded. The fins which consist of chlorinated polyethylene each form a convex section spanning the hose wall and enclosing a cavity (H), the narrow ends of the section being bonded to the hose. Pref. each fin forms a foamed body and the circumference of the hose is covered by fins packed closely together. Peripheral angle of each fin is pref. 65-70 deg C..