Painting edge limiter for a painting arrangement with a...

B - Operations – Transporting – 05 – C

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B05C 11/04 (2006.01) D21H 23/36 (2006.01) D21H 25/10 (2006.01)

Patent

CA 2195201

A coating edge limiter for a coating arrangement with a short dwell time. Color is fed under pressure into a coating chamber formed by a backing roll around which a paper web is guided, a barrier wall, a doctor blade element and sealing blocks located at both ends of the coater. A formatting plate almost completely covers an application zone between the doctor blade element and the barrier wall so that an edge region of the web is sharply delineated and kept completely free of color. In each of the sealing blocks water is supplied via channels to depressions thereby forming a pressure cushion. This pressure cushion prevents the pressurized slip in the coating chamber from flowing out laterally and ensures that the formatting plate is pressed flatly against the web. The coating edge limiter thereby makes it possible to establish very precisely the width of the web to be produced.

Appareil limiteur latéral pour dispositif d'enduction à court temps de contact, pour l'enduction d'une bande continue de matière (2), notamment de papier, obturant hermétiquement latéralement, à ses deux extrémités, une chambre d'enduction de la matière à appliquer, formée entre une paroi de retenue (4) et une raclette (3). La zone d'application (12) formée sur la bande de papier est ainsi recouverte, à plat, à chaque bord, par la lame de formatage (8) du limiteur latéral. Le support (7) de ce limiteur est relié rigidement à un bloc d'étanchéité (5) et est en saillie vers l'extérieur, au-dessus de la paroi de retenue (4). Le bloc d'étanchéité (5) présente, sur le côté opposé à la lame de formatage (8), au moins une cavité (11) reliée, par un canal (13), à une arrivée d'eau (20). Entre la lame (8) et le bloc (5), il se forme un intervalle étroit d'obturation (15), de 1 à 3 mm de largeur, l'eau parvenant dans cet intervalle (15), par la cavité (11), produisant un rembourrage sous pression et appliquant, par pression, la lame de formatage (8) à plat sur la bande de papier.

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