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TIJ PRINTHEAD PROFILE

IP.com Disclosure Number: IPCOM000026921D
Original Publication Date: 1994-Jun-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 57K

Publishing Venue

Xerox Disclosure Journal

Abstract

When printing on plain paper using a thermal inkjet printer, one experiences a problem known as cockle. Paper cockle occurs when paper becomes wet with ink, deforms, and raises up. With a universal printhead mounted approximately 30 to 40 mils above the paper surface, the raised bump interferes with the printhead on the next imaging pass causing smear defects. As the printhead to paper surface spacing is reduced to less than 20 mils for quality printing, the problem becomes worse. The problem is even greater in color printing due to the usage of larger volumes of ink. Coated paper has been observed to deform, but without the image defects.

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XEROX DISCLOSURE JOURNAL

TIJ PRINTHEAD PROFILE

Herman A. Hermanson Roger G. Markham

Proposed Classification
U.S. C1.346/140 Int. C1. Gold 15/18

When printing on plain paper using a thermal inkjet printer, one experiences a problem known as cockle. Paper cockle occurs when paper becomes wet with ink, deforms, and raises up. With a universal printhead mounted approximately 30 to 40 mils above the paper surface, the raised bump interferes with the printhead on the next imaging pass causing smear defects. As the printhead to paper surface spacing is reduced to less than 20 mils for quality printing, the problem becomes worse. The problem is even greater in color printing due to the usage of larger volumes of ink. Coated paper has been observed to deform, but without the image defects.

A printhead face comprises a substrate and an ink manifold. Since the thermal injet printhead is generally larger than necessary, an improvement is proposed to keep the printhead length profile as narrow as possible at the printhead face. The substrate and ink manifold should recede rapidly at the ends of the printing device to depth of at least .060 of an inch so that there is no surface for the raised paper to rub against.

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 3 May/June 1994 215

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216 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 3 May/June 1994

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