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Design principles of integrated vacuum slot arrangement

DSpace at IIT Bombay

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Title Design principles of integrated vacuum slot arrangement
 
Creator TANWAR, J
VINJAMUR, M
SCRIVEN, LE
 
Subject flow
dies
slot-die
precision coating
vacuum slot
vacuum box
 
Description Coating on a substrate with a slot-die forms alternate wet and dry stripes as the substrate speed is increased when the upstream pressure equals the downstream pressure. The coating thickness is thus nonuniform across the width of the substrate. Applying vacuum upstream of the feed slot allows uniform coating at higher speeds. Different methods to apply vacuum were invented over five decades. The latest method, an integrated vacuum slot arrangement, is novel and compact. Vacuum is applied through a second slot, called vacuum slot, in the die placed upstream of the feed slot. The design principles of the arrangement are elucidated by modeling airflow in the arrangement, which is similar to liquid flow in the feed slot, but in the opposite direction. Well-accepted equations that have been derived by rigorous order of magnitude analysis to describe liquid flow have been used to model airflow. Sensitivity of the performance of the arrangement with respect to geometry is described.
 
Publisher JOHN WILEY & SONS INC
 
Date 2011-08-04T12:59:24Z
2011-12-26T12:54:44Z
2011-12-27T05:42:58Z
2011-08-04T12:59:24Z
2011-12-26T12:54:44Z
2011-12-27T05:42:58Z
2007
 
Type Article
 
Identifier AICHE JOURNAL, 53(3), 572-578
0001-1541
http://dx.doi.org/10.1002/aic.11112
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9368
http://hdl.handle.net/10054/9368
 
Language en