Synthetic press roll and methods for its manufacture

Details Synthetic press roll and methods for its manufacture Synthetic press roll and methods for its manufacture

D - Textiles, Paper

21

F

26/198, 92/21.5

D21F 3/08 (2006.01) C22C 29/00 (2006.01) C22C 32/00 (2006.01) F16C 13/00 (2006.01)

Patent

CA 1274997

ABSTRACT OF THE DISCLOSURE A synthetic press roll for use in paper machines includes a cylindrical mantle to which a surface layer is applied, the surface layer comprising a mixture of a first powder of metal particles and a second powder of an inorganic compound. The metal particles of the first powder may include copper, bronze, stainless steel, nickel, chromium and/or as titanium alloy. The inorganic compound of the second powder may comprise quartz, feldspar, Al2O3, ZrO2, TiO2, TiC, SiC, MgO, Si3N4, Cr2O3, WC, NbC, VC, Cr7C3, or other corresponding ceramic material, or mixtures of the same. The surface layer may be produced by thermal spraying, casting, by winding a sintered and/or rolled band of the mixture around the mantle, or by forming a flexible mat pre-coating in which the desired mixture is bound by a binder, such as PTFE, and by fixing the pre-coating to the roll mantle by melting it by means of induction or laser heating. A press roll in accordance with the invention provides a controlled detachment of the paper web from the roll and is more resistant to variations in temperature and to mechanical strains than conventional press rolls.

499182

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