Printing press having doctor blade with integral tape seal...

B - Operations – Transporting – 41 – F

Patent

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Details

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

Patent

CA 2165029

A doctor blade for a printing press includes a thin unbroken doctoring plate having a rear portion secured to a chamber housing of a printing press and a front portion with a doctoring edge which contacts an outer surface of an ink roll to meter ink thereto; and a thin sealing layer secured across one surface of the thin doctoring plate at a rear portion thereof and spaced away from the doctoring edge so as to be out of contact with the outer surface of the ink roll when the doctor blade is secured in the printing press, the sealing layer being made from a closed cell foam and having a thickness in the range from .005 to .125 inch, the thin sealing layer being sandwiched between the thin doctoring plate and the chamber housing to prevent migration of ink therebetween.

Racle pour une presse à imprimer comprenant une mince plaque d'allongement lisse présentant une partie arrière fixée solidement à une enveloppe de la presse à imprimer et une partie avant avec une arête d'allongement qui touche une surface externe d'un rouleau encreur afin de doser l'encre allant sur ce dernier. L'invention comporte également une mince couche d'étanchéité fixée solidement sur une surface de la partie arrière de la mince plaque d'allongement et espacée de l'arête d'allongement de façon à ne pas toucher la surface externe du rouleau encreur lorsque la racle est montée solidement sur la presse à imprimer. La couche d'étanchéité est faite de mousse à alvéoles fermées et présente une épaisseur allant de 0,005 à 0,125 pouce. Elle est insérée entre la mince plaque d'allongement et l'enveloppe pour empêcher l'encre de passer d'un élément à l'autre.

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