Laminated porous polytetrafluoroethylene tube and its process of manufacture

摘要

A method of manufacturing a porous tetrafluoroethylene tube comprises forming a sheet of tetrafluoroethylene containing a lubricant, winding it into a tubular shape, wrapping reinforcing material about the tubular shape to form a tubular product, rolling the tubular product so that it may have a uniform wall thickness, preheating the tubular product at a temperature lower than 327° C., stretching the tubular product longitudinally, and heating it at a temperature higher than 327° C. , while holding it in its stretched position. The method may also be used to manufacture a tube containing 15 to 95% by weight of a filler.