Control over excess coating composition in coating device for tr

Details Control over excess coating composition in coating device for tr Control over excess coating composition in coating device for tr

1993-09-10

1996-12-31

Lamb, Brenda A.

Coating apparatus

Immersion or work-confined pool type

Work-confined pool

118419, 118410, B05C 302

Patent

active

055896596

ABSTRACT:
A device for predosing coating composition on a traveling web of paper. A guide member extends obliquely toward the web. Downstream in the path of the web past the guide member, a doctor element is supported spaced from the tip of the guide member for defining a pressure space between the a guide member and the doctor element. Coating composition is fed through a feed channel between the guide member, on the one hand, and the doctor element and the supports for the doctor element up to the pressure space, on the other hand. An exit slot from the pressure space between the guide member and the web is defined at the tip of the guide member. The guide member has a guide surface down from the tip of the guide member, on the side of the guide member away from the doctor element which faces generally toward the web. The guide surface defines a return channel for coating composition that has moved out of the pressure space and through the slot. The guide surface is gradually inclined so that the return channel gradually enlarges away from the tip of the guide member and the return channel serves as a pressure reduction space for the excess coating composition. The doctor element may be in the form of a doctor bar or a coating blade with an angle of application against the web of at most 20.degree..

REFERENCES:
patent: 4688516 (1987-08-01), Sommer
patent: 4757782 (1988-07-01), Pullinen

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