A heat setting polymeric hose having a high pack, textile reinforcement that shrinks at a temperature at least equal to the heat setting temperature of the polymeric. The hose is made by twining a heat shrinkable and generally untwisted textile reinforcement around a heat curable polymeric tube; applying an adhesive and heat setting polymeric cover over the reinforcement; and heat setting or curing the polymeric while simultaneously shrinking the reinforcement to a predetermined position within the hose.
The invention relates to a hose comprising an inner plastics tube (2) covered by at least one braiding of filaments disposed in helically crossed layers (5, 6) around the inner tube (2), characterized in that the filaments (7) are made of plastics and are so deformed in their right cross-section that the gap (8) between any two adjacent layers (6a, 6b) which extend in the same direction as one another is at least 100% filled. The invention also relates to a process for the production of the hose.
Methods for producing improved pipe structures for natural gas distribution pipelines produce a thin fibrous jacket or layer which can inhibit and prevent cracks in natural gas distribution piping by preventing surface scratches as well as by enhancing the pipe strength. Thermoplastic fibers are preferred in accordance with methods and structures of the present invention to facilitate the use of joining techniques and hot-tapping techniques common in the natural gas distribution industry. Non-woven, heat shrinkable fibers are also employed in sleeve structures to produce a protective fibrous jacket or layer.
A brake hose includes two reinforcing layers in a rubber base. The brake hose comprises an inner tube rubber layer having a flow path for flowing fluid, a lower yarn layer formed by braiding first yarns around the inner tube rubber layer and an upper yarn layer formed by braiding second yarns around the lower yarn layer and a cover rubber layer covering the upper yarn layer. A lower yarn layer duty LD given by the equation, LD(%)=(LRP/PRP).times.100, has a value of 50-65%, where LRP denotes an inner pressure at which a brake hose without the upper yarn layer and the cover would burst, and PRP denotes an inner pressure at which the brake hose would burst.
A brake hose has an inner tube layer made from a rubber material, a lower thread layer made of braided lower threads, an intermediate rubber layer, an upper thread layer made of braided upper threads, and a skin rubber layer. The lower thread layer is constituted by lower threads each having a first adhesive thin film adhesively bonded to the inner tube layer and to the intermediate rubber layer. The upper thread layer is constituted by upper threads each having a second adhesive thin film adhesively bonded to the intermediate rubber layer and to the skin rubber layer.
