Claims
- 1. A press roll for paper machines, comprising:
- a roll body having a cylindrical exterior formed of metallic material; and
- a coating applied over said roll body exterior formed of a material including a mixture of a metallic component and a ceramic component, said coating material having a surface energy within the range of between about 35 to 50 mJ/m.sup.2,
- whereby said press roll has generally acceptable web release properties for paper pulp.
- 2. The combination of claim 1 wherein said coating material is more hydrophobic than granite material, said coating having advantageous release properties for pulps containing hydrophilic substances.
- 3. The combination of claim 2, wherein said coating material has a polarity component lower than about 7.1 mJ/m.sup.2.
- 4. The combination of claim 1 wherein said coating material is more hydrophilic than granite material, said coating providing advantageous release properties for pulps containing hydrophobic substances.
- 5. The combination of claim 4, wherein said coating material has a polarity component greater than about 7.1 mJ/m.sup.2.
- 6. The combination of claim 1 wherein said metallic component of said roll coating comprises a base metal and chromium alloy, wherein said alloy contains between about 9 to 35 percent chromium.
- 7. The combination of claim 6 wherein said metallic component of said roll coating comprises stainless steel.
- 8. The combination of claim 1 wherein said ceramic component comprises at least one 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.
- 9. The combination of claim 1 wherein said coating material comprises a metallic component comprising stainless steel having a composition including carbon, silicon, manganese, phosphorous, sulfur, nickel, molybdenum and chromium, the amount of chromium being present in the range of between about 9 to 35 percent.
- 10. The combination of claim 9, wherein the amount of chromium is about 13.15%.
- 11. The combination of claim 1 wherein said coating material comprises a metallic component comprising a cobalt based alloy having a composition including carbon, tungsten and chromium, the amount of chromium being in the range of between about 9 to 35 percent.
- 12. The combination of claim 11 wherein the amount of chromium is about 26 percent.
- 13. The combination of claim 1 wherein said coating material comprises a metallic component comprising a nickel based alloy mainly including chromium and molybdenum.
- 14. The combination of claim 13, wherein the amount of chromium is about 17 percent.
- 15. The combination of claim 1, wherein said coating material has a polarity component of about 7.1 mJ/m.sup.2.
- 16. The combination of claim 1, wherein said ceramic component comprises a mixture of Al.sub.2 O.sub.3 and TiO.sub.2.
- 17. The combination of claim 1, wherein said metallic component includes a mixture of at least two of the following elements: Al, Cu, Ni, Cr, Co.
- 18. The combination of claim 1, wherein said metallic component includes a mixture of Al and Cu.
- 19. The combination of claim 1, wherein said metallic component comprises at least about 20% of total surface area of said coating.
- 20. A press roll for paper machines, comprising;
- a roll body having a cylindrical exterior formed of metallic material; and
- a coating applied over said roll body exterior formed of a material including a mixture of a metallic component and a ceramic component, said coating material having a surface energy within the range of between about 35 to 50 mJ/m.sup.2.
- wherein said metallic component comprises a mixture of aluminum and copper, and said ceramic component comprises a mixture of Al.sub.2 O.sub.3 and TiO.sub.2.
- whereby said press roll has generally acceptable web release properties for paper pulp.
Priority Claims (1)
Number |
Date |
Country |
Kind |
853544 |
Sep 1985 |
FIX |
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Parent Case Info
This application is a continuation-in-part of application Ser. No. 894,925 filed Aug. 8, 1986 now U.S. Pat. No. 4,748,736 which is a continuation-in-part of application Ser. No. 816,628 filed Jan. 6, 1986.
US Referenced Citations (11)
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
894925 |
Aug 1986 |
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Parent |
816628 |
Jan 1986 |
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