Title:
IMPROVED SHORT DWELL TIME COATER AND METHOD
Document Type and Number:
WIPO Patent Application WO2002092243
Kind Code:
B1
Abstract:
An improved short dwell type coater (18) and method are provided. The coater (18) can coat a web (26) directly or a moving roll surface (26' or 27') as in a film coater or size press. The flow path in the coater includes a flow modifier (54) shaped to have the introduced coating first turn upstream relative to the web (26) or roll surface (26' or 27'), then turn across a curved surface (73, 74) toward the web (26) or roll (26' or 27') and around the flow modifier (54). The flow then converges toward the top of the flow modifier (54) and passes the tip (63) of the flow modifier. Some flow remains on the web (26) or roll (26' or 27') and is subsequently doctored, while most is turned away from the web (26) or roll (26' or 27') and merged with the incoming flow. A gap (46) filled with coating overflow provides a liquid seal. This coater and method use coating, reduce vortices and streaking, and can operate at higher speeds.
Inventors:
DAMRAU WAYNE A
Application Number:
PCT/US2002/014962
Publication Date:
December 19, 2002
Filing Date:
May 13, 2002
Export Citation:
Assignee:
STORA ENSO NORTH AMERICA CORP (US)
International Classes:
B05C3/18; D21H23/36; B05C9/04; B05C11/04; (IPC1-7): B05D3/12; B05C11/02; B05C11/04
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