JPS6449843A - Ventilating duct - Google Patents

Abstract

PURPOSE:To disperse air uniformly when the air passing through the inside penetrates into the outside by a method wherein fibrous material is wound round in pipe shape to form a core and its inner surface and outer surface are covered by permeable covering material. CONSTITUTION:A core 1 is formed in such a way that one or more than one kinds of fibrous material such as glass fiber, plastic fiber, mineral fiber, metal fiber, etc., are wound round in pipe shape such as ring shape, etc., in its cross section and air blasting through the inner space alpha and ventilation penetrating through the openings in the fibrous material of the core 1 are carried out. The core 1 has a function that air moving in the inner space alpha is evolved into the outside by the pressure and diffusion of the air and when the air is evolved, the air is diffused in the core 1 by porosities formed by the interwinement of the fibrous material and the air is evolved uniformly into the outside. Sheet- shaped covering materials 2, 3 covering the inner and outer surfaces of the core 1 are used to obtain the form-holding property of the core 1 and also used to avoid providing an unpleasant feeling caused by touching of or sticking to hands and clothes of the fibrous material as the raw material of the core 1 at the time of assembly.