A capillary surface injection squeegee for the screen...

B - Operations – Transporting – 41 – F

Patent

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Details

B41F 15/44 (2006.01)

Patent

CA 2342816

The invention concerns a capillary doctor blade with surface injection for liquid product (4) screen printing with viscous liquids on a substrate (1) through the orifices of a silkscreen (2). Said self-contained element is adaptable on direct transfer devices comprising a reservoir capable of being pressurised with a length corresponding to the substrate to be screen printed. The surface injection doctor blade comprises an elastically deformable capillary element (16) in contact with the silkscreen (2), preventing the product natural flow (4) when it is not subjected to the pressure (F2) and which allows a product flow matching the application requirements when the product is under pressure. Scraping lips (6a and 6b) oppositely inclined ensure that the device is sealed at the front and at the rear of the injection surface (10) while the ends are sealed by sealing foam blocks. The invention also concerns a work method for said surface injection capillary doctor blade.

L'invention concerne une racle capillaire à injection surfacique pour la sérigraphie de produits liquides (4) à liquides visqueux sur un substrat (1) à travers les ouvertures d'un écran de sérigraphie (2). Cet organe autonome est adaptable sur les dispositifs de transfert direct comprenant un réservoir pressurisable de longueur correspondante au substrat à sérigraphier. La racle à injection surfacique comprend un organe capillaire (16) élastiquement déformable en contact avec l'écran de sérigraphie (2), qui empêche l'écoulement naturel du produit (4) lorsqu'il n'est pas soumis à la pression (F2) et qui autorise un débit de produit en adéquation avec les besoins de l'application lorsque le produit est sous pression. Des lèvres de raclage (6a et 6b) inclinées en opposition assurent l'étanchéité du dispositif en avant et en arrière de la surface d'injection (10) alors que l'étanchéité sur les extrémités est obtenue par des blocs de mousse étanche. L'invention concerne également le procédé de travail de la racle capillaire à injection surfacique ci-dessus mentionnée.

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