Utilization of a printing ink in a printing group and printing group of a rotary printing press
A method for operating a printing group and a device for the use of a printing ink in a rotary printing press is disclosed. 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 method for operating a printing group including:
providing at least one rotating structural component in said printing group;
supplying a printing ink to said at least one rotating structural component;
providing means for adjusting a temperature of one of said at least one rotating structural component and said printing ink;
providing a temperature regulating device for regulating said temperature;
providing a control device for said temperature regulating device;
providing one of a higher reference variable and a higher maximum value of said temperature at a higher production speed;
providing one of a lower reference variable and a lower maximum value of said temperature at a lower production speed; and
using said control device for selecting said temperatures for said two production speeds which are different from each other.
2. The method of claim 1 wherein said at least one rotating structural component is a printing group cylinder.
3. The method of claim 1 further including providing said printing group for waterless planographic printing.
4. The method of claim 2 wherein said printing group cylinder is a forme cylinder which is temperature regulated by said temperature regulating device.
5. The method of claim 2 wherein said printing group cylinder is a transfer cylinder which is temperature regulated by said temperature regulating device.
6. The method of claim 1 further including operating said printing group using an indirect printing process.
7. The method of claim 1 further including regulating said temperature from an interior of said rotating structural component using a fluid.
8. The method of claim 1 further including providing a material to be imprinted as a paper with a coating weight of no greater than 20 g/m 2 .
9. The method of claim 1 further including providing a material to be imprinted as newsprint.
10. The method of claim 1 further including providing said temperature-regulating device from said control device with one of a reference variable and a maximum value, which is not to be exceeded, as a command value.
11. The method of claim 1 further including maintaining a tackiness of said printing ink constant by temperature-regulating said rotating structural component.
12. The method of claim 1 further including providing a mean tack value for said printing ink and varying an actual tackiness from said mean tack last value by no greater than ±25%.
13. The method of claim 1 further including using said temperature-regulating means for controlling a tackiness of said printing ink between 6 and 9.5 tack in connection with production speeds between 10 m/s and 16 m/s.
14. The method of claim 3 further including using said temperature-regulating means for controlling a tackiness of said printing ink between 6 and 9.5 tack in connection with production speeds between 10 m/s and 16 m/s.
15. The method of claim 2 further including selecting a temperature greater than 30° C. for a production speed of at least 10 m/s.
16. The method of claim 4 further including selecting a temperature greater than 30° C. for a production speed of at least 10 m/s.
17. The method of claim 2 further including setting one of said reference variable and said maximum value of said temperature in said temperature-regulating device at greater than 30° C. for a production speed at least equal to 30 m/s.
18. The method of claim 4 further including setting one of said reference variable and said maximum value of said temperature in said temperature-regulating device at greater than 30° C. for a production speed at least equal to 30 m/s.
19. The method of claim 1 further including providing said at least one rotating structural component as a roller which is temperature-regulated by said temperature-regulating means.
20. The method of claim 19 further including providing said roller as a screen roller.
21. 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, 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.
22. The printing group of claim 21 wherein the printing group includes a waterless planographic printing forme.
23. The printing group of claim 21 wherein said rotating structural component is a roller of an inking unit.
24. The printing group of claim 21 wherein said rotating structural component is a screen roller.