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AIR PRESSURE SUPPORTED FILM

IP.com Disclosure Number: IPCOM000023881D
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 241K

Publishing Venue

Xerox Disclosure Journal

Abstract

To provide a thin film of ink onto a moving plastic substrate, a critical distance between the coater lip and a substrate support roller must be maintained. It is desirable to maximize this distance while maintaining the coating thickness uniformity. Since the geometry of the miniscus below the coater lip influences the coating thickness, modification of this geometry by applying an air pressure differential across the coater-to-substrategap results in a thinner film for a wider gap. One method of achieving this is to apply a negative pressure or vacuum to a cavity above the coater body. The cavity is sealed against the coater body with low-friction,dynamic end seals against both ends of the moving substrate. An adjustable baffle allows the substrate to enter the cavity and also controls entrance air velocity. Another method of obtaining this result is the inclusion of a similar sealed cavity below the inker body to which is applied filtered air at a positive pressure.

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XEROX DISCLOSURE JOURNAL

AIR PRESSURE SUPPORTED FILM Proposed Classification Christian 0. Abreu U.S. Cl. 96/1
David D. Hoesly tnt. CI. G03g
Shy Shung Hwang
E. E. Reiber

To provide a thin film of ink onto a moving plastic substrate, a critical distance between the coater lip and a substrate support roller must be maintained. It is desirable to maximize this distance while maintaining the coating thickness uniformity. Since the geometry of the miniscus below the coater lip influences the coating thickness, modification of this geometry by applying an air pressure differential across the coater~-to~substrategap results in a thinner film for a wider gap. One method of achieving this is to apply a negative pressure or vacuum to a cavity above the coater body. The cavity is sealed against the coater body with low~friction,dynamic end seals against both ends of the moving substrate. An adjustable baffle allows the substrate to enter the cavity and also controls entrance air velocity. Another method of obtaining this result is the inclusion of a similar sealed cavity below the inker body to which is applied filtered air at a positive pressure.

Volume 4 Number 2 March/April 1979 137

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[This page contains 1 picture or other non-text object]