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:
A pumping unit (1) for supplying printing ink to a printing unit (2) is described. In order to achieve as effective a utilisation of the printing unit (2) as possible and the shortest possible time for exchanging different printing ink colours, the described pumping unit (1) is arranged with a printing ink tank (27) and a cleaning liquid tank (28). The pipe (33, 34) for sucking up or return pumping of the cleaning liquid/printing ink may be slided from a position in one or the other tank (27, 28). Process steps of inking as well as of cleaning are controlled by a central control unit (44) so that the only intervention of the operator that is necessary, is exchange of the printing ink tank (22) when a new printing ink colour is to be applied in the printing unit (2).
Abstract:
A doctor blade, in particular a chambered doctor blade, comprising at least one doctor blade for abutting against a printing means, in particular a printing or colour printing roller or other printing means, to be coated with a fluid material, and with a behind the doctor blade or the doctor blades arranged chamber, which preferably through the doctor blade or the doctor blades abuts against the printing means, is described. For the improving of such a doctor blade, such as achieving a simplified and beamtight sealing, at least one partitioning means (4), crosswise oriented, is arranged in the chamber (3) so that this partitioning means (4) tightening abuts against the inside of the chamber (3) and against the under side of the doctor blades (1, 2), and in that the partitioning means (4) at the spacing between the edges of the doctor blades (1, 2) exhibits a concave shape able to abut against the outside of the printing means. The partitioning means may in a more detailed described manner comprise one or more tightening or sealing means and may be displaceable arranged.
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 onto a plate cylinder, and said plate cylinder 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 the workpiece further without a subsequent workpiece entering the coating unit, the rotation of the plate cylinder is stopped.
Abstract:
An apparatus for conveying a sheet-formed item from a digital printing unit, the apparatus including an inlet side and an outlet side, and including a set of conveying devices for moving items in a conveying direction and a method for regulating such an apparatus. The apparatus includes a device for aligning an article from one position to another position in relation to one or more reference points, and a device for fixing an item at a given position in relation to a stop. The method includes the steps: detecting an item; receiving and conveying the item; regulating a possible skew position of the item as the item is moved against a stop on the conveying device, where the item is acted on by one speed of the conveyor belt and moved into abutment on the conveying means at a lower speed; and fixing the item in the aligned position.
Abstract:
A printing unit has a doctor blade chamber, a rotatable roller, and a gasket for sealing between the doctor blade chamber and the roller. One end of the gasket has at least one sealing surface directed towards the doctor blade chamber, the gasket having a thickness which is delimited by a first edge and a second edge at the sealing surface. The other end of the gasket has an elastomeric edge for sealing abutment against the roller, the elastomeric edge being offset in a longitudinal direction of the roller relative to at least one of the first and second edges and delimits the thickness of the sealing surface. The a surface of the gasket extending between the doctor blade chamber and the roller is inclined at an angled of less than 90° relative to longitudinal axis of the roller and/or the sealing surface, and is concave and/or convex.
Abstract:
A method for regulating the flow of a viscosity-dependent liquid in a graphic process, including a pump (5) configured for pumping a viscosity-dependent liquid (3) from a first container (4) and to a graphic printing machine (1), and wherein the viscosity of the liquid (3) affects operation of the pump (5), a sensor (8) connected with the pump (5) and which is configured to measure at least one of the operational parameters of the pump (5), and a controller (9) connected with the sensor (8) and which is configured to analyze the data from the sensor (8). The controller (9) determines the viscosity of the liquid (3) from the measured operational parameters of the pump (5) and generates a control signal (17) from the measured viscosity, based on which the viscosity of the liquid (3) pumped through the pump (5) can be adjusted.
Abstract:
A cleaning arrangement for a coater that has a plate cylinder, the cleaning arrangement having a cleaning web, a tangential moving mechanism configured to controllably move the cleaning web in at least one direction in a plane defined by the cleaning web, a radial moving mechanism configured to controllably move the cleaning web in at least one direction out of the plane, and a controller coupled to the tangential and radial moving mechanisms which is configured to control the moving of the cleaning web into and out of contact with the plate cylinder in conformity with input signals received by the controller.
Abstract:
A printing unit has a doctor blade chamber, a rotatable roller, and a gasket for sealing between the doctor blade chamber and the roller. One end of the gasket has at least one sealing surface directed towards the doctor blade chamber, the gasket having a thickness which is delimited by a first edge and a second edge at the sealing surface. The other end of the gasket has an elastomeric edge for sealing abutment against the roller, the elastomeric edge being offset in a longitudinal direction of the roller relative to at least one of the first and second edges and delimits the thickness of the sealing surface. The a surface of the gasket extending between the doctor blade chamber and the roller is inclined at an angled of less than 90° relative to longitudinal axis of the roller and/or the sealing surface, and is concave and/or convex.