Doctor blade design for metering ink transfer to anilox cells

B - Operations – Transporting – 41 – F

Patent

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Details

B41F 5/24 (2006.01) B41F 31/02 (2006.01) B41F 31/20 (2006.01)

Patent

CA 2444515

Disclosed is a self-regulating, dual-doctor blade assembly that can accurately meter ink delivery to the anilox roll (3) of a flexographic printing system. The system utilizes a retractable dual-blade configuration in conjunction with an ink chamber and a gap between the lower doctor blade (11) and the anilox roll. The upper blade (14) in this system contact the anilox roll at a point after its rotation through the application tray and scrapes ink from the surface of the anilox roll directly into the ink chamber. As the chamber fills with ink, the hydraulic pressure created by the spinning of the anilox roll increases to a point where the anilox cells are filled to the appropriate volume. The gap then allows proper volume of ink delivery to the anilox cells (10) and also allows ink to be expelled from the chamber when a critical hydraulic pressure is reached.

L'invention concerne un dispositif de racle duale, à autorégulation pouvant mesurer avec précision la distribution d'encre au niveau d'un rouleau anilox (3) d'un système d'impression flexographique. Ce système utilise un modèle de lame duale rétractable avec une chambre à encre et un espacement entre la racle inférieure (11) et le rouleau anilox. La racle supérieure (14) de ce système rentre en contact avec le rouleau anilox au niveau d'un certain point, après avoir tourné à travers le plateau d'application, et gratte l'encre de la surface du rouleau d'anilox, pour l'amener directement dans la chambre à encre. A mesure que la chambre se remplit d'encre, la pression hydraulique créée par la rotation dudit rouleau d'anilox augmente jusqu'à un certain point auquel les cellules anilox sont remplies pour atteindre le volume approprié. Cet espacement permet alors la distribution d'un volume adéquat d'encre aux cellules anilox (10), ainsi que l'expulsion de l'encre de la chambre, lorsqu'une pression hydraulique critique est atteinte.

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