Expandable edge dam assembly for paper coating apparatus

Details Expandable edge dam assembly for paper coating apparatus Expandable edge dam assembly for paper coating apparatus

1981-04-21

1982-10-19

Lawrence, Evan K.

Coating apparatus

Immersion or work-confined pool type

Work-confined pool

277 34, B05C 318

Patent

active

043544525

ABSTRACT:
An edge dam or edge seal assembly for an applicator for applying a coating liquid to a moving web of paper carried on a backing roll, the applicator being of the type having a chamber for receiving coating liquid and an opening therein for directing the liquid onto the web, the opening being formed between a front wall of the chamber and a doctor blade exending from the rear of the opening to against the web, is characterized by an expandable seal element sealed with the front wall and doctor blade in an end space therebetween and extending toward and closely adjacent to but spaced from the web. The seal element is of a flexible material and accommodates the introduction of pneumatic or hydraulic fluid under pressure therein for expanding the same to a size which fills the end space and seals the same, and which extends a sealing surface of the element very closely adjacent to the web or backing roll. Consequently, leakage of coating past the seal element may be accurately controlled and significantly minimized.

REFERENCES:
patent: 2818120 (1957-12-01), Whitton
patent: 4327662 (1982-05-01), Damrau

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