Hose manufacture

Details Hose manufacture Hose manufacture

B - Operations, Transporting

29

C

18/1174, 18/777

B29C 35/06 (2006.01)

Patent

CA 1121123

ABSTRACT HOSE MANUFACTURE A method of manufacturing a hose comprising a layer of polymeric material having an embedded reinforcement structure. The hose structure is formed on a mandrel and the polymeric material is cured by passing the assembly through a curing unit containing heating fluid at a pressure greater than 100 p.s.i. The use of pressures greater than 100 p.s.i. ensures the hose components are securely bonded to one another and avoids the use of a conventional outer lead sheath which is expensive and the fitting and removal of which considerably increases the cycle time. Preferred heating fluids are salts, such as a eutectic mixture of sodium and potassium nitrates, a mixture of sodium nitrate and sodium nitrate or Cassell TR 155. At the vulcanisation temperatures of 170 - 200°C used the temperature of the heating fluids is substantially independent of pressure. Pressures up to 500 p.s.i. can be used to achieve the necessary bonding of the hose components.

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