Improvements in and relating to printing plate ovens

Details Improvements in and relating to printing plate ovens Improvements in and relating to printing plate ovens

G - Physics

03

F

G03F 7/40 (2006.01) A21B 1/00 (2006.01) B41C 1/10 (2006.01)

Patent

CA 2544265

The present invention relates to a printing plate oven 10 designed for lithographic printing plates and, in particular, for baking Kodak DITP gold printing plates. The printing plates oven comprises heating apparatus including a number of heating elements which extend at an angle relative to the direction of a printing plate passing through the oven. The printing plate oven also comprises drive means for driving the printing plates in which two rollers are urged towards each other on either side of the printing plates but the rollers are profiled such that they do not simultaneously contact a part of the printing plate at directly opposite locations. The printing oven includes cooling means which comprise deflecting means in order to flex a part of the printing plate during cooling. Furthermore, the heating elements of the printing oven are controlled in order to vary the heat applied to the printing plate depending upon the position of the printing plate.

La présente invention se rapporte à un four pour plaques d'impression (10) conçu pour des plaques d'impression lithographiques et, en particulier, à un four pour cuire des plaques d'impression Kodak DITP Gold. Ce four pour plaques d'impression comporte un appareil de chauffage comprenant un certain nombre d'éléments chauffants qui sont disposés de manière à former un angle par rapport à la direction de passage d'une plaque d'impression à travers le four. Le four pour plaques d'impression comprend également un moyen d'entraînement permettant d'entraîner les plaques d'impression, dans lequel deux rouleaux sont poussés en direction l'un de l'autre de chaque côté des plaques d'impression, mais ces rouleaux étant profilés de sorte qu'ils n'entrent pas simultanément en contact avec une partie de la plaque d'impression en des emplacements directement opposés. Le four pour plaques d'impression comprend également un moyen de refroidissement qui comporte un moyen déflecteur conçu pour incurver une partie de la plaque d'impression pendant le refroidissement. En outre, les éléments chauffants du four pour plaques d'impression sont commandés de sorte que la chaleur appliquée à la plaque d'impression varie en fonction de la position de ladite plaque d'impression.

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