B - Operations – Transporting – 41 – N
Patent
B - Operations, Transporting
41
N
B41N 1/00 (2006.01) B41N 1/16 (2006.01) G03F 5/00 (2006.01) G03F 5/16 (2006.01) B41M 1/06 (2006.01)
Patent
CA 2377055
The printing element has the shape of a propeller. All printing elements of a printing dot have S-shaped and equally large sides all around. The clearings between adjacent printing elements have a constant width around a printing element. Due to said configuration, it is possible to mirror the printing element around a central axis while preserving the form of a printing element in such a way that only round corners are obtained since sharp corners would provoke an unstable image causing moiré effects. Said printing element form is particularly useful in four-color printing.
Selon l'invention, la forme de l'élément d'impression est hélicoïdale. Tous les éléments d'impression d'un point d'impression présentent des côtés en S de même longueur. Les éléments de liaison entre des éléments d'impression adjacents présentent une largeur constante autour d'un élément d'impression. En raison de cette configuration, il est possible, tout en conservant la forme d'un élément d'impression, d'obtenir une image spéculaire de ce dernier autour d'un axe central de façon à produire uniquement des coins arrondis, car les coins pointus provoquent sinon une image grainée et des phénomènes de moiré. Cette forme d'élément d'impression est donc particulièrement importante pour la quadrichromie.
Marks & Clerk
Sandy Screen Ag
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