Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1996-12-16
1998-06-09
Simmons, David A.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264150, 264236, 2643282, 26433113, 264347, 525178, 525184, B29C 4788
Patent
active
057628505
ABSTRACT:
Hoses are often reinforced with fabric to improve their performance characteristics, such as burst strength. For instance, radiator hose used in automotive applications is generally reinforced with continuous yarn. However, it is a labor-intensive process to manufacture such hoses which include fiber reinforcements. A substantial amount of material waste also generally occurs in the manufacture of such fiber-reinforced hose. By utilizing the technique of this invention, hose which has a high level of burst strength can be manufactured without including continuous yarn reinforcement. This invention specifically reveals a process for manufacturing a hose which comprises (1) extruding a rubber composition into the form of a tube, wherein the rubber composition is comprised of (a) a polypropylene/polyethylene alloy comprised of (i) a low melt index polyethylene and (ii) polypropylene, wherein the polypropylene is homogeneously dispersed throughout the polyethylene in the polypropylene/polyethylene alloy, (b) an EPDM rubber, (c) carbon black, (d) at least one curative, (e) zinc oxide, (f) a processing oil and (g) stearic acid; (2) shaping the tube into the geometric form desired for the hose; and (3) curing the rubber composition at a temperature within the range of 130.degree. C. to 210.degree. C. to produce the hose.
REFERENCES:
patent: 4183876 (1980-01-01), Coran et al.
patent: 5268134 (1993-12-01), Burlett et al.
patent: 5380571 (1995-01-01), Ozawa et al.
patent: 5622210 (1997-04-01), Crisman et al.
Pyle Kevin James
Sandstrom Paul Harry
Sinsky Mark Samuel
Jones Kenneth M.
Rockhill Alvin T.
Simmons David A.
The Goodyear Tire & Rubber Company
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