Film applicator with entrained air removal and surface control

Details Film applicator with entrained air removal and surface control Film applicator with entrained air removal and surface control

D - Textiles, Paper

21

H

D21H 23/32 (2006.01) B05C 1/08 (2006.01) B05C 3/18 (2006.01) D21H 23/34 (2006.01) D21H 23/60 (2006.01) B05C 11/04 (2006.01)

Patent

CA 2230028

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 nonuniform 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 flow stability and machine runnability.

Un film uniforme d'enduction est appliqué sur un substrat tel que du papier, des feutres et des blanchets par un applicateur de film (20; 100; 120, 142) qui comporte un coin convergent fixe (33; 88; 108, 128, 150), un coin convergent réglable (33) et une voie d'extraction (45; 92; 112; 132, 154) située entre les deux coins. Avec les éléments qui le composent, cet applicateur de film réduit les instabilités du flux hydrodynamique ainsi que les variations de flux associées à une alimentation irrégulière et une ligne de contact dynamique. Cet applicateur de film assure également l'extraction de l'air entraîné ainsi que de l'excédent du matériau d'enduction de la zone d'application, améliorant ainsi la stabilité de flux et l'aptitude au fonctionnement de la machine.

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