Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1997-04-02
1999-05-25
Beck, Shrive
Coating processes
With post-treatment of coating or coating material
Heating or drying
4273722, 427379, 427381, 427382, 118 65, 118 67, 34421, 34423, 34463, 34488, 34492, 34501, 34503, 34504, 34506, B05D 304, B05D 302
Patent
active
059068620
ABSTRACT:
A method and apparatus for coating and drying coated substrates without introducing significant surface imperfections while running at higher web speeds than known drying methods. The substrate is preferably coated within the drying enclosure or the coating bead may form a closure at the entrance of the drying enclosure. The substrate is moved through a first drying enclosure along a first axis. The first drying enclosure is substantially isolated from an external environment. A first low velocity, substantially laminar flow field of a drying gas is directed across the front surface of the substrate. The first flow field is generally parallel to the front surface and generally perpendicular to the first axis to minimize the formation of surface imperfections during the evaporation of the coating solvent. The substrate may then be moved to subsequent drying enclosures through transition enclosures that minimize surface imperfections due to high velocity interaction between the adjacent drying enclosures. In embodiments where the first axis is in an inclined configuration with respect to horizontal, louvers may be utilized for directing solvent evolving from the substrate to minimize surface imperfections due to solvent cascade.
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Brown Omar D.
Marcellus Manley C.
Norton Daniel V.
Ray Wayne P.
Scheller Bernard A.
Barr Michael
Beck Shrive
Minnesota Mining and Manufacturing Company
Weimer William K.
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