Browse Prior Art Database

HEATED CALENDERING ROLL FOR SHEET COCKLE CONTROL

IP.com Disclosure Number: IPCOM000026223D
Original Publication Date: 1990-Dec-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 90K

Publishing Venue

Xerox Disclosure Journal

Abstract

The generation of paper cockle is a very severe problem for thermal ink jet based copiers/printers, particularly for high area coverage images. The problem manifests itself as unacceptability of output sheet quality to the customer or as extremely difficult paper handling concerns, particularly for duplex copies. One method of preventing cockle, which is used in the commercial paper coating industry, is drying the paper while under tension. This approach is adequate for continuous roll stock, but has its practical limitations when considering cut sheet applications.

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XEROX DISCLOSURE JOURNAL

HEATED CALENDERING ROLL Proposed Classification FOR SHEET COCKLE CONTROL
George J. Roller
Arthur M.
Gooray

US. C1.034/242 Int. C1. F26b 25/00

22 16 27 20

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FIG. I

XEROX DISCLOSURE JOURNAL - Vol15 No 6 NovembedDecember 1990 397

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HEATED CALENDERING ROLL FOR SHEET COCKLE CONTROL( Con t 'd)

The generation of paper cockle is a very severe problem for thermal ink jet based copiers/printers, particularly for high area coverage images. The problem manifests itself as unacceptability of output sheet quality to the customer or as extremely difficult paper handling concerns, particularly for duplex copies. One method of preventing cockle, which is used in the commercial paper coating industry, is drying the paper while under tension. This approach is adequate for continuous roll stock, but has its practical limitations when considering cut sheet applications.

Sheet cockle may be eliminated within the context of cut sheet paper handling applications and practical machine architectures by a heated transport roll with some amount of nip pressure (calendering). Decockling is most effective when the calendering roll acts on the sheet while the sheet is still in its plastic state (still warm; about 130°F). This concept, coupled with a dryer that dries up to the point of no offset, offers significant advantages in terms of power, space and process speed.

Referring to the system...