Short dwell time coater and method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Nov 21, 2002
app pub date -
May 16, 2001
filing date -
May 16, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An improved short dwell type coater and method are provided. The coater can coat a web directly or a moving roll surface as in a film coater or size press. The flow path in the coater includes a flow modifier shaped to have the introduced coating first turn upstream relative to the web or roll surface, then turn across a curved surface toward the web or roll and around the flow modifier. The flow then converges toward the top of the flow modifier and passes the tip of the flow modifier. Some flow remains on the web or roll and is subsequently doctored, while most is turned away from the web or roll and merged with the incoming flow. A gap filled with coating overflow provides a liquid seal. This coater and method use coating, reduce vortices and streaking, and can operate at higher speeds.
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