Claims
- 1. A method for manufacturing a press roll for paper machines, said press roll including a metallic cylindrical mantle having an outer surface, comprising the steps of:
- (a) selecting a material at least partially comprising a metallic component having a surface energy which corresponds to the surface energy of granite material;
- (b) preparing an elongated band including said material;
- (c) applying said band around said outer surface of said cylindrical mantle in band form and at the same time forming a coating on said cylindrical mantle from said band by welding; and
- (d) in the case where said material does not include a ceramic component, adding a ceramic component to said material during one of step (b) or step (c);
- whereby a press roll for a paper machine is obtained having a mantle providing said press roll with necessary strength and a coating on said mantle providing for a controlled detachment of a paper web from the roll and which substantially provides the roll surface with resistance to mechanical and thermal strains.
- 2. The method of claim 1 wherein said material includes a ceramic component and, in particular, comprises chromium-containing stainless steel alloy having a chromium carbide component constituting said ceramic component.
- 3. The method of claim 1 wherein said welding band is applied to said outer surface of said roll mantle at a speed greater than the band welding speed.
- 4. The method of claim 1 wherein said material does not include a ceramic component, and wherein said ceramic component is added to said material during the preparation of the elongated band by the steps of:
- preparing a powder mixture including a powder component of said metallic material and a powder ceramic component;
- compressing said powder mixture; and
- sintering said compressed powder mixture to obtain said elongated band.
- 5. The method of claim 4 wherein said ceramic component is chosen from the group consisting of Al.sub.2 O.sub.3, SiO.sub.2, TiO.sub.2, ZrO.sub.2, SiC, TiC, Cr.sub.3 C.sub.2, WC, NbC, VC, and Cr.sub.7 C.sub.3.
- 6. The method of claim 1 wherein said material does not include a ceramic component, and wherein said ceramic component is added to said material during the application of said band around said outer surface of said cylindrical mantle and the formation of a coating on said cylindrical mantle from said band by arc-welding, by the steps of:
- performing said welding in the presence of a shield powder;
- adding a powder of ceramic component to said shield powder; and
- alloying said shield powder including said ceramic component to said material of said band while said band is in a molten state during said welding.
- 7. The method of claim 6 wherein said ceramic component is chosen from the group consisting of Al.sub.2 O.sub.3, SiO.sub.2, TiO.sub.2, ZrO.sub.2, SiC, TiC, Cr.sub.3 C.sub.2, WC, NbC, VC, and Cr.sub.7 C.sub.3.
- 8. The method of claim 1 wherein said welding band has a width in the range of between about 30 to 150 mm.
- 9. The method of claim 8 wherein said welding band has a thickness of about 0.5 mm.
- 10. The method of claim 1, wherein the welding carried out in step (c) is arc-welding.
Priority Claims (1)
Number |
Date |
Country |
Kind |
853544 |
Sep 1985 |
FIX |
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BACKGROUND OF THE INVENTION
This application is a continuation-in-part of U.S. application Ser. No. 816,628 filed Jan. 6, 1986.
US Referenced Citations (15)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0208897 |
Jan 1987 |
EPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
816628 |
Jan 1986 |
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