Damping roller for printing presses and method for the...

B - Operations – Transporting – 41 – N

Patent

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B41N 7/04 (2006.01)

Patent

CA 2288792

The invention relates to a damping roller for printing presses and to a method for the production thereof, wherein a heat injected microporous special steel coating is applied to a cylindrical base body. The average pore size of said coating is approximately 5 µm. A thicker moistening agent film is obtained by capillary force thereby enabling a higher moistening agent flow rate in the damping system of an off-set printing press. The size of the micropores is limited in order to avoid dirt contamination of the damping system as a result of carryover and emulsification of printing ink. This enables good printing quality and a stable printing process. The positive surface properties enable the amount of isopropyl alcohol added to the off-set moistening agent to be substantially reduced and provides environmentally-friendly printing conditions.

L'invention concerne un rouleau mouilleur pour machines d'imprimerie et son procédé de production. Selon ledit procédé, on applique, sur un corps de base cylindrique, un recouvrement d'acier fin microporeux, pulvérisé thermiquement, dont la grandeur moyenne des pores (à savoir 5 µm), est telle que l'on obtient, grâce à des forces de capilarité, un film d'agent mouillant plus épais et ainsi un débit plus élevé pour le transport de l'agent mouillant dans le dispositif de mouillage d'une machine d'impression offset. La grandeur des micropores est limitée de façon à éviter un encrassement du dispositif de mouillage par entraînement et émulgation d'encre d'impression. On obtient ainsi de bonnes conditions préalables à une haute qualité d'impression et à un processus d'impression stable. Etant donné que les caractéristiques de surface sont positives, l'addition d'isopropanol à l'agent mouillant offset est fortement réduit. Grâce à cela on peut réaliser une impression ne nuisant pas à l'environnement.

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