Soft doctoring cup

Details Soft doctoring cup Soft doctoring cup

B - Operations, Transporting

41

F

B41F 9/10 (2006.01) B41F 15/44 (2006.01) B41F 17/00 (2006.01) B41F 31/02 (2006.01)

Patent

CA 2259689

A doctoring cup (14) particularly suited for inking non-flat plates (12) includes a plate contacting edge (24) with an "Ease of Flex" parameter greater than about 0.020 lb-1. Ease of Flex is defined as 1/Mt2, where t is the thickness of the plate contacting edge (24), and M is the flexural modulus of the material from which the cup wall (18) defining the edge (24) is formed. By non-flat plates (12) is meant plates out of flat by greater than 0.0002 inches/inch. The doctoring cup (14) can be used to ink both flat and non-flat printing plates (12) using a doctoring pressure of less than about 300 psi.

La présente invention concerne une cellule de raclage (14) convenant particulièrement à l'encrage de clichés non uniformes (12) et comprenant un bord de contact (24) avec le cliché doté d'un indice de flexibilité "Ease of Flex" supérieur à 0,020 livre?-1¿ environ. L'indice de flexibilité "Ease of Flex" est défini par 1/Mt?2¿ où t est l'épaisseur du bord de contact (24) avec le cliché, et M est le module en flexion du matériau dans lequel est réalisée la paroi de la cellule formant le bord. On entend par cliché non uniforme un cliché présentant une déformation supérieure à 0,0002 pouces/pouce. Ladite cellule de raclage peut être utilisée pour encrer des clichés uniformes et non uniformes avec une pression de raclage inférieure à 300 psi environ.

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