Utilization of a printing ink in a printing group and printing group of a rotary printing press
The tack of an ink that is used in a printing group of a rotating printing press, or the temperature of a rotating component in the printing group is selected or controlled. The ink itself is temperature regulated in response to production speeds to maintain the ink tackiness in the desired range. A gradient that sets forth an interrelationship between ink tackiness, temperature and production speed can be used in a control device for use in temperature regulation.
1. A printing group of a rotary printing press comprising:
a forme cylinder;
a dressing on said forme cylinder;
means for supplying printing ink to said forme cylinder, said dressing supplying said ink to a material to be printed;
means for temperature-regulating at least one of said forme cylinder, said dressing and said ink to one of a reference variable and a maximum value of a temperature; and
means for operating said printing group at at least a higher production speed and a lower production speed, said reference variable and said maximum value of said temperature being higher at said higher production speed and lower at said lower production speed and further wherein said material to be imprinted is paper having a coating weight of no greater than 20 g/m 2 , said lower production speed is at least 10 m/s, and said one of said reference variable and said maximum value is more than 30°.
2. The printing group of claim 1 further including a waterless planographic printing forme as said dressing.
3. A printing group of a rotary printing press comprising:
a rotating structural component of the printing group;
means for supplying ink to said structural component and from said structural component to a material to be printed;
a temperature-regulating device for regulating a temperature of at least one of said rotating structural component, an area adjacent said rotating structural component and said ink to one of a reference variable and a maximum value; and
a control device adapted to control said temperature-regulating device to maintain a tackiness of said ink on said rotating structural component constant by regulating said temperature, said control device utilizing an interrelationship between said temperature and a production speed of the printing group wherein a higher one of said reference variable and said maximum value is preset in said regulating device as a command value for a higher production speed, and a lower one of said reference variable and said maximum value is preset for a lower production speed.
4. The printing group of claim 3 wherein the printing group includes a waterless planographic printing forme.
5. The printing group of claim 3 wherein said rotating structural component is a roller of an inking unit.
6. The printing group of claim 3 wherein said rotating structural component is a screen roller.