FILM APPLICATOR WITH ENTRAINED AIR REMOVAL AND SURFACE CONTROL

A uniform film of coating is delivered onto a substrate such as paper, felts and blankets by a film applicator (20; 100; 120; 142) which has a static converging wedge (32; 88; 108; 128; 150), an adjustable converging wedge (33 ), and an extraction channel (45; 92, 112; 132; 154) located between the...

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Bibliographic Details
Main Authors LI, ALFRED C, BUSKER, LEROY H, BECKER, REX A
Format Patent
LanguageEnglish
French
Published 27.05.2003
Edition6
Subjects
APPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL
APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
IMPREGNATING OR COATING OF PAPER
PAPER NOT OTHERWISE PROVIDED FOR
PAPER-MAKING
PERFORMING OPERATIONS
PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D
PRODUCTION OF CELLULOSE
PULP COMPOSITIONS
SPRAYING OR ATOMISING IN GENERAL
TEXTILES
TRANSPORTING
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Summary:A uniform film of coating is delivered onto a substrate such as paper, felts and blankets by a film applicator (20; 100; 120; 142) which has a static converging wedge (32; 88; 108; 128; 150), an adjustable converging wedge (33 ), and an extraction channel (45; 92, 112; 132; 154) located between the two wedges. As a unit, the film applicator minimizes the hydrodynamic flow instabilities, as well as reduces flow variations associated with a nonunifo rm feed and a dynamic contact line. The film applicator also removes entrained air and excess coating from the application zone in order to improve the flo w stability and machine runnability.
Bibliography:Application Number: CA19962230028