Abstract An all-polymeric textile-reinforced hose particularly suited for pressure service, typically an all-nylon hose, and a method of making same are disclosed. The hose comprises an inner thermoplastic tube, two or more successive layers of thermoplastic textile reinforcement wound helically (spirally), each successive helically disposed reinforcing layer being disposed oppositely to the preceding layer, and a polymeric outer protective jacket. The innermost reinforcing layer is fused to the inner tube and successive reinforcing layers are fused to one another. This fusion is typically accomplished by softening with a resorcinol-water solution followed by juxtaposition of the components to be joined after which the resorcinol softening agent is removed with a water bath. Before the outer polymeric jacket is applied, the assembly is softened with a softening agent which is thereafter removed; this effects activation of the plastic in the outer helical textile layer and such activation, coupled with the activation in the rest of the structure as a result of previous treatments with a softening agent and removal thereof, enhances bonding of the outer jacket to the assembly. The textile reinforcement may be constituted by synthetic multifilament yarns made of continuous thermoplastic filaments, having a total twist (including any so-called producer''s or manufacturer''s twist) of from 0 to 15 turns per inch, preferably from one to five turns per inch. Alternatively, but generally less preferably, the reinforcement may be formed of thermoplastic staple yarns or of so-called monofils.
The method of making a hose which comprises plasticizing the outer surface of an inner nylon tube with a resorcinol-water solution, winding a first layer of parallel nylon textile reinforcing elements helically around and in direct contact with the plasticized outer surface of said tube at an angle with respect to the longitudinal axis of said tube, effecting fusion of said elements to the outer surface of said tube with said solution, removing substantially all of said resorcinol from the assembly by passing the assembly through a water bath, drying the resulting assembly, plasticizing the outermost portions of said first layer with a resorcinol-water solution, winding a second layer of parallel nylon textile reinforcing elements helically around and in direct contact with said plasticized first layer and in a direction opposite to that of said first layer at approximately the same angle with respect to said longitudinal axis, effecting fusion of said first and second layers at the areas of contact therebetween with said solution, removing substantially all of said resorcinol from the assembly by passing the assembly through a water bath, drying the resulting assembly, plasticizing the outermost portions of said second layer with a resorcinol-water solution, removing substantially all of said resorcinol from the assembly by passing the assEmbly through a water bath, drying the resulting assembly, and immediately thereafter extruding hot, molten nylon directly around the assembly at a temperature and pressure sufficient to cause said hot molten nylon to impregnate the accessible interstices of said assembly and form an outer protective nylon jacket around the assembly.
Claim 2
Independent Claim
196 words
A method of making a hose which comprises winding a plurality of successive layers of parallel nylon textile reinforcing elements helically around an inner nylon tube, disposing the elements of each of said layers at approximately the same angle with respect to the longitudinal axis of said tube and oppositely disposing the elements of each successive pair of said layers, fusing the first layer to the outer surface of said tube with a resorcinol-water solution, removing substantially all of said resorcinol from the assembly with water, fusing the elements of each successive pair of said layers to one another at the areas of contact therebetween with said resorcinol-water solution and removing substantially all of said resorcinol from the assembly with water after each such fusion operation, plasticizing the outermost portions of the outermost of said layers with said resorcinol-water solution, removing substantially all of said resorcinol from the assembly with water, drying the resulting assembly, and immediately thereafter extruding hot, molten nylon directly around the assembly at a temperature and pressure sufficient to cause said hot molten nylon to impregnate the accessible interstices of said assembly and form an outer protective nylon jacket around the assembly.