Abstract:
The present invention concerns an apparatus for corona treatment, the apparatus including a corona treatment unit (1) with an inlet side (2) and an outlet side (3), wherein the unit (1) includes one or more sets of transverse electrodes ( 10, 11), at least one electrode (10) in each set being connected to a high voltage source and at least one second electrode (11) connected electrically to earth, wherein the second electrode connected to earth includes a rotatable roller. The new feature according to the invention is that the apparatus is a through-flow apparatus adapted for corona treatment of material in sheets (9), and including at least one conveying table (4) with a transverse direction and a longitudinal direction, where the at least one conveying table (4) includes mechanical conveyor means. By such a solution is achieved an apparatus through which sheets (9) of material can be conveyed and corona- treated without holding the material and pulling it through the apparatus.
Abstract:
The invention concerns in general the technology of automatic maintenance operations in printing and package manufacturing machinery. Especially the invention concerns the task of maintaining smooth and reliable operation of a coater that on a manufacturing line comes after a sheet-fed printer. Th invention relates to a cleaning arrangement for a coater that comprises a plate cylinder (101), the cleaning arrangement comprising: a cleaning web (202), a tangential moving mechanism (203, 204) configured to controllably move said cleaning web (202) in at least one direction in a plane defined by said cleaning web (202), a radial moving mechanism (205, 302) configured to controllably move said cleaning web (202) in at least one direction out of said plane, and a controller (501) coupled to said tangential and radial moving mechanisms (203-205, 302), said controller (501) being configured to control the moving of said cleaning web (202) in conformity with input signals received by said controller (501).
Abstract:
Method for cutting out coating plates for use in digital printing units. A method for cutting out coating plates for use in digital printing units, where the cutting of coating plates is effected by means of a digital cutting machine, the cutting machine including a computer control and further including a mother roller, the method including at least the following steps: • a file including at least cutting data is transferred to the computer control of the digital cutting machine; • a sleeve with coating plate material is mounted on the mother roller of the cutting machine; • the coating plate mounted on the sleeve and the mother roller are cut out in the ratio 1: 1 whereby is achieved, among others, that a mounting machine is no longer necessary in order to apply coating material on a sleeve, whereby registering accuracy is increased and shrinking effect is avoided.
Abstract:
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.
Abstract:
The present invention concerns a printing roller for a printing machine, e.g. for a flexographic printing machine, wherein the printing roller includes a rotary and longitudinal axis and an external surface, the external surface being substantially cylindrical and adapted for mounting a plate. The new feature of a printing roller according to the invention is that the external cylindrical surface includes at least one longitudinal groove, where the at least one longitudinal groove includes a geometry with one or more surfaces, the surface or surfaces lying within a circumscribed cylindrical surface for the external surface of the printing roller. In other words, this means that the longitudinal groove or grooves are cutouts in the form of milled or ground grooves in the external cylindrical surface itself on a printing roller.