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    • 92. 发明专利
    • COATED STEEL MEMBER
    • GB1421395A
    • 1976-01-14
    • GB4895573
    • 1973-10-19
    • JAPAN NATIONAL RAILWAYOILES INDUSTRY CO LTD
    • B32B15/02B21F9/00B32B15/08E04C5/01E04C5/08B29F3/10E04C5/07
    • 1421395 Extruding lubricant onto steel members JAPANESE NATIONAL RAILWAYS and OILES KOGYO KK 19 Oct 1973 [19 Oct 1972] 48955/73 Heading B2E [Also in Divisions B5, C5 and El] A layer of lubricant e.g. oil is formed either between a steel member and a plastics coating or between a plastics coated steel member and an outer plastics coating as a result of extruding a lubricant-containing plastics material onto a steel or plastics-coated steel member fed through a cross-head extruder. Double coated steel members may have an inner coating of lubricant-containing plastics material and an outer coating of lubricant-free plastics material or vice versa. The steel member is suitable for embedding in prestressed concrete and may comprise wire or rod. The lubricant may be miscible or immiscible with the host plastics material, may be present in an amount of from 3-15% by weight and may comprise a mineral, vegetable, animal or synthetic oil. The layer of lubricant may be up to 10Á thick. The plastics coatings may be polyacetal, polyamide, P.V.C., polyvinylidene chloride, polyvinylacetate, polyacrylonitrile, H.D. polythene, polypropylene, polybutene or co-polymers thereof.