Coating apparatus – Immersion or work-confined pool type – Work-confined pool
Patent
1991-04-19
1993-04-06
Wityshyn, Michael G.
Coating apparatus
Immersion or work-confined pool type
Work-confined pool
118413, 118419, B05C 318, B05C 1104
Patent
active
051999919
ABSTRACT:
A short dwell coater apparatus is disclosed for applying coating material onto a web guided by a backing roll. The apparatus includes a coater housing which is disposed in close proximity to the backing roll. The arrangement is such that the web guided by the backing roll moves between the backing roll and the housing. The housing defines an application chamber which is open towards the web and which extends along the web in a cross-machine direction. The application chamber is connected to a source of coating material such that the coating material is applied to the web during movement of the web past the chamber. The coater housing has an upstream lip which is disposed upstream relative to the chamber and adjacent to the web. The lip defines an upstream coating overflow for permitting excess coating material to flow therethrough. A flexible coater metering blade is disposed downstream relative to the chamber. The blade extends from the housing towards the web for metering the coating material applied to the web. A perforate conduit is disposed within the chamber and extends in a cross-machine direction. The conduit permits the flow therethrough of a vortex of entrained air generated within the chamber such that in use of the apparatus, when the vortex of entrained air is generated within the chamber, the air flows through the perforate conduit away from the chamber so that streaking of the coating material due to the intermittent escape of the entrained air past the metering blade is inhibited.
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patent: 4903632 (1990-02-01), Sollinger
"The Flow Characteristics In A Short Dwell Coater" by D. E. Eklund & P. C. Norrdahl; Coating Conference 1986; pp. 99-102.
"Relationship Between Flow Instability In Short Dwell . . . " by N. G. Triantafillopoulos & C. K. Aidun; Coating Conference 1990; pp. 309-324.
Archer David J.
Beloit Technologies Inc.
Campbell Raymond W.
Veneman Dirk J.
Wityshyn Michael G.
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