Knife coating method using ascension of the fluid by its tension

Details Knife coating method using ascension of the fluid by its tension Knife coating method using ascension of the fluid by its tension

1994-10-06

1997-03-18

Bareford, Katherine A.

Coating processes

With post-treatment of coating or coating material

Solid treating member or material contacts coating

4274343, 118126, 118410, 118413, B05D 312

Patent

active

056120923

ABSTRACT:
To knife-coat elastic liquids without the presence of flow instability, the extension rate in the upstream region of the coating bead is kept low by increasing the distance over which the liquid must accelerate. The onset of the flow instability is delayed by insuring that the upstream liquid-air interface of the coating bead is relatively long and flat. This is accomplished by allowing the elastic liquid to pull itself over a relatively large distance out of a trough and into the knifing passage. The liquid is able to ascend into the knifing passage by virtue of liquid tension developed by the extensional flow in the upstream region of the coating bead.

REFERENCES:
patent: 3038441 (1962-06-01), Wamsley
patent: 3638604 (1972-02-01), Herzhoff et al.
patent: 5399376 (1995-03-01), Flinchum et al.

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