Method of extrusion coating

Coating processes – With post-treatment of coating or coating material – Solid treating member or material contacts coating

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Details

427356, 427128, 427131, 118410, 118411, B05D 312

Patent

active

053976002

ABSTRACT:
A coating method and coating apparatus with which a thin film having a uniform thickness free from stripe or step unevenness of a coating composition is formed at a high speed. An extrusion-type coating head is provided which has a front edge and at least one back edge, the front edge being disposed on the upstream side in the direction of movement of a support, the back edge being disposed on the downstream side in the direction of movement of the support, and the back edge having a top end which is set back stepwise from the front edge in the direction away from the support. Coating is performed under the conditions that the pressure P.sub.c of the coating composition at a point of application of the coating composition onto the support is in a range of 0.ltoreq.P.sub.c .ltoreq.0.25 kgw/cm.sup.2, while liquid sealing is obtained with a composition mainly containing an organic solvent applied in advance to a coating surface of the support. The ratio of t.sub.1 /t.sub.0 satisfies the relation 0.2.ltoreq.t.sub.1 /t.sub.2 .ltoreq.20, where t.sub.0 represents the thickness of the coating composition before drying just after coating, and t.sub.1 represents the length of a perpendicular line from the top end of the most downstream side back edge to a tangent drawn between the front edge and a conveyance roll on the downstream side of the coating head.

REFERENCES:
patent: 4480583 (1984-11-01), Tanaka et al.
patent: 4907530 (1990-03-01), Shibata et al.
patent: 4968528 (1990-11-01), Tanaka et al.
patent: 5083524 (1992-01-01), Hiraki et al.
patent: 5250320 (1993-10-01), Suzuki et al.

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