Patent ID: 6759109
Filing Date: 2004-07-06
Classification: B29C,F16L,Y10T

Abstract:
A process for manufacturing a rubber hose having a multilayer wall formed of at least an inner layer of rubber and an outer layer of rubber, the process comprising the steps of extruding the inner and outer layers simultaneously without the aid of any mandrel and curing them together, wherein the hose has an inside diameter not exceeding 20 mm and a wall thickness of at least 2 mm, of which at least one-third is occupied by the thickness of the outer layer, and the inner layer is of a rubber composition containing acrylonitrile-butadiene rubber (NBR) or H-NBR having a high AN content, while the outer layer is of a rubber composition having a minimum Mooney viscosity of 25 to 65 at a curing temperature.