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US 4,705,711 AGranted
Polyimide covered calender rolls
AssigneeE. I. Du Pont de Nemours and Company
InventorDominic R. Perna
Life of this patent
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Abstract
Calender roll comprising a cylindrical metal shaft bearing a polyimide cover, wherein the shaft is knurled to eliminate slippage between the shaft and the cover.
Claims1
In a cylindrical metal shaft bearing a polyimide cover, the improvement wherein the shaft is knurled with a diamond or straight pattern to a depth of about from 0.001 to 0.005 inches, wherein the product of the knurl diametral pitch and the depth of knurl on the shaft in inches is about from 0.15 to 0.32, and the interference between the polyimide cover and the shaft is about from 0.003 to 0.0085 inches per inch of shaft diameter.
Dependencies are inferred from the claim text.