摘要:
A coating unit is located after a sheet-fed digital printer on a manufacturing line. As a response to a workpiece entering the coating unit from the printer, coating substance is dosed (203) onto a plate cylinder (101), and said plate cylinder (101) is rotated to transfer said coating substance onto the workpiece, which is then transferred further on the manufacturing line. As a response to a first time limit expiring after transferring said workpiece further without a subsequent work- piece entering the coating unit, the rotation of the plate cylinder (101) is stopped.
摘要:
Ce procédé pour l'impression successive d'un premier travail d'impression (44) et d'un deuxième travail d'impression (52) sur une même bande en utilisant au moins un groupe d'impression de la presse rotative pour l'impression du premier travail d'impression et du deuxième travail d'impression (52), le groupe d'impression comprenant au moins un cylindre porte-plaques, une plaque, un cylindre porte-blanchet et un blanchet, comprend, entre le premier travail d'impression et le deuxième travail d'impression, une étape de changement de plaque (50) dans laquelle on maintient le blanchet écarté de la bande et on change des plaques du cylindre porte-plaques. Selon un aspect de l'invention, entre le premier travail d'impression (44) et le deuxième travail d'impression (52), on maintient la bande en défilement au travers de la presse rotative.
摘要:
The invention relates to a cleaning device (4) for cleaning a printing cylinder (2), said device comprising a driven rotary brush (12) having a rotational axis (16) parallel to the rotational axis of the printing cylinder (2) and comprising a brush arrangement (28; 28a-d) mounted on a drive shaft (30). Said brush arrangement (28; 28a-d) comprises a plurality of sleeve-type brush elements (28a-d) which are axially arranged one after the other. The invention also relates to a corresponding cleaning device (4) comprising a carrier element (6) extending parallel to the drive shaft (30) and provided with at least one channel arrangement (38a, b; 40a, b) extending in the axial direction and used to distribute and/or dispense a cleaning medium. The carrier element (6) is embodied, as a single component, as an extruded section comprising the channel arrangement (38a, b; 40a, b).
摘要:
A wiper blade for a printer roller in which the deformable wiper tip is attached to a support plate by being gripped between inwardly crimped webs. An upstanding central prong is received in the wiper tip for additional support. The wiper tip can comprise a body part which is gripped by the support plate and a contact edge part for contacting the roller, wherein the contact edge part is harder than the body part. The body part and contact edge part may be coextruded in one piece.
摘要:
A process for the removal of dry adhesives and/or inks from the surface and from the interior of the cells of the engraved cylinders used in printing and coupling processes, using a supercritical mixture formed by one or more organic solvents and a supercritical fluid, preferably consisting of supercritical carbon dioxide. The microscopic cells of the engraved cylinders used in printing industry or of the cylinders used for film coupling in packaging industry are thoroughly and easily cleaned by a process comprising the steps of forming the said supercritical mixture, delivering it in a high pressure autoclave previously filled with the engraved cylinders to be cleaned, cleaning for a given residence time, eliminating the organic solvent residue in the autoclave by washing it with supercritical fluid and precipitating the extracted inks and/or adhesives in one or more separators located downstream the autoclave.
摘要:
The invention relates to a device and method for cleaning a printing carrier in which the printing carrier (10) is cleaned before each printing cycle and, in turn, before applying new image information. In order to clean the printing carrier (10), the printing carrier is subjected to the action of a cleaning fluid. A digital method is preferably used for structuring.
摘要:
A method of preventing a non-image portion of a printing plate and the surface of a wet roller in an offset printer from being soiled with an oily material, such as printing ink, by applying ultrasonic waves from the ultrasonic wave generators provided on a plate cylinder roller and the wet roller to the surfaces of the same rollers in motion. According to this method, the deposition of an oily material, such as printing ink on a non-image portion of a printing plate and the surface of the wet roller can be prevented effectively by a very simply constructed apparatus.
摘要:
A blade assembly (32) of a waste catchment system (30) for a roller (42) comprises a support plate (33) for attachment to a tray (31) of the waste catchment system and a blade holder (34). The blade holder is configured to receive a blade (40) having a free edge adapted to engage with the roller to be cleaned. The blade holder (34) includes a channel (35a) for receiving and retaining the blade (40), the blade being insertable into and removable from the blade holder by sliding with respect thereto. The blade holder and the blade comprise respective co-operating elements (35a, 40b) configured to permit sliding of the blade relative to the blade holder in the longitudinal direction of the blade and to constrain the blade against movement relative to the blade holder in a direction perpendicular to the said longitudinal axis.