✦ LIBER ✦

Gravure roll coating of newtonian liquids

✍ Scribed by R. Patel; H. Benkreira

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 436 KB
Volume: 46
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(91)80181-w

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✦ Synopsis

An experimental investigation of the flexible blade/gravure roll coating operation is presented for a wide range of operating conditions. The film thickness is measured with an infrared gauge and the data reveal two regions of constant film thickness. At low capillary number (Ca i 0.3). the film thickness increases with increasing roller roughness defined as cell volume per unit area. At capillary number > 7.0, the film thickness is essentially independent of roughness. In all cases a decrease is observed with increasing slot gap. This, a priori, unexpected result is explained with reference to the flow beneath the blade which is circulatory at large gaps and linear at low gaps.

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