Collapsible vent pipe for vapor extraction hoods has rigid wall sections connected by flexible strips

摘要

Flat wall sections (2a-2d) made of a dimensionally stable material and adjacent walls are connected to each other by strips (3a-3d) of a flexible material to form a collapsible rectangular cross-section. Flat wall sections (2a-2d) made of a dimensionally stable material and adjacent walls are connected to each other by strips (3a-3d) of a flexible material to form a collapsible rectangular cross-section. Connecting strips run in the direction of the vent pipe axis. Four or more rectangular wall members are assembled with each pair of opposing edges connected by the flexible strips. An Independent claim is made for a process for manufacturing a vent pipe in which the wall members(2a-2d) and connecting strips(3a-d) are coextruded, with the connecting strips following the wall members, and then joined together.