Metal working – Method of mechanical manufacture – Roller making
Patent
1986-01-06
1990-08-28
Goldberg, Howard N.
Metal working
Method of mechanical manufacture
Roller making
29130, 29132, 164 98, 427135, 427436, B21D 5300
Patent
active
049513923
ABSTRACT:
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 metallic material and a second powder of an inorganic material. The metallic material of the first powder includes copper, bronze, stainless steel, nickel, chromium and/or a titanium alloy. The inorganic material of the second powder comprises quartz, feldspar, Al.sub.2 O.sub.3, ZrO.sub.2, TiO.sub.2, TiC, SiC, MgO, Si.sub.3 N.sub.4, Cr.sub.2 O.sub.3, WC, NbC, VC, Cr.sub.7 C.sub.3, or other corresponding ceramic material, or mixtures of the same. The surface layer may be produced by thermal spraying, casting, by winding a sintered 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 precoating 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.
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Metals Handbook, vol. 8, Metallography, Structures and Phase Diagrams, 8th Edition, 1973, p. 248, 321.
Cuda I.
Goldberg Howard N.
Valmet Paper Machinery Inc.
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