Importance

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Abstract

A coater includes a gravuer roll rotatably mounted in a fountain of coating material. A doctor blade engages the roll and doctors material from the surface. A curved predoctor deflector opens upstream of the material and has an inclined upper edge at about the level of the material to form a wedge-shaped gap forcing material into the roll. The deflector bottom is spaced from the fountain bottom to define a return path. A curved deflector at the doctor blade collects doctored material from the doctor blade and returns it to the return path. The predoctor generates a reverse material flow in the fountain creating a pressure at the return path to create a smooth circulation of coating material and essentially constant level in the said container.

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First Claim