DE102006024788A1 - Printing machine is fitted with cavitation mixer which mixes ink and dampening solution to produce emulsion which is then fed via inking system to printing unit - Google Patents

Abstract

The printing machine is fitted with a cavitation mixer (13) which mixes ink and dampening solution to produce an emulsion. The emulsion is then fed via an inking system (12) to the printing unit (10).

Description

The The invention relates to a printing press according to the preamble of the claim 1.

printing presses have several printing units, in web-fed rotary printing presses several printing units to a Pressure unit are summarized. So are from the prior art Printing units of web-fed rotary printing presses, the two, comprise three or even four printing units. Every printing unit of a printing press has a transfer cylinder, with the help of its ink on a substrate to be printed can be applied. On the transfer cylinder is a Rubber blanket or a rubber sleeve positioned, which is why the transfer cylinder Also referred to as rubber cylinder. Next to the transfer cylinder has each printing unit continues to over one on the transfer cylinder rolling form cylinder, on which a printing form positioned is. The printing form can be designed as a printing plate or Drucksleeve. About one with the form cylinder cooperating inking can on the the printing cylinder positioned printing form applied ink become.

at Every offset press is known from practice Printing unit next to the transfer cylinder, the form cylinder and the inking unit continue via a dampening unit, in addition to Ink a dampening solution positioned on the forme cylinder Apply printing form. In known from the prior art printing machines Accordingly, the ink and the fountain solution on separate Facilities on the printing forme positioned on a form cylinder applied, namely the ink over an inking unit and the dampening solution via a dampening unit.

Of these, Based on the present invention, the problem is based to create a novel printing press.

This Problem is solved by a printing machine according to claim 1. The Printing machine according to the invention has at least one cavitation mixer to make of printing ink and dampening solution to provide a printing ink fountain solution, the above the inking of the printing units on a on the forme cylinder of the respective Printing unit positioned printing form is applicable.

With the present invention is proposed over the Inking unit of each printing unit an emulsion of printing ink and Dampening agent on the on the forme cylinder of each printing unit applied printing form, the printing machine at least a Kavitationsmischer has to the ink-dampening emulsion to provide from printing ink and dampening solution. The invention is based on the knowledge that with the help of a Kavitationsmischers printing ink and dampening solution can be emulsified stably, so even after relatively long downtime there is no danger that the ink-dampening solution emulsion decays.

preferred Further developments of the invention will become apparent from the dependent claims and the following description. Embodiments of the invention without being limited to this to be closer to the drawing explained.

there shows:

1 : a schematic section of a printing press according to the invention.

Hereinafter, the present invention will be described with reference to FIG 1 described on an exemplary embodiment.

1 shows a section of a web-fed rotary printing press in the range of two printing units 10 holding a printing tower 11 form. In the embodiment shown, each printing unit has 10 over a total of four printing units, whereby of the printing units of the printing units 10 in 1 schematizes only inking units 12 are shown. In addition to the shown inking units 12 Each printing unit has the printing units 10 furthermore via a forme cylinder and a transfer cylinder.

For the purposes of the present invention is the inking unit 12 every printing unit of the printing units 10 an ink-dampening solution emulsion supplied, wherein the ink-dampening emulsion according to 1 from a cavitation mixer 13 provided. In the cavitation mixer 13 is in a color tank 14 prepared ink with in a dampening solution tank 15 prepared dampening solution to provide a printing ink fountain solution. The ink is using a pump 16 from the color tank 14 taken and the Kavitationsmischer 13 fed. About another pump 17 dampening solution is added to the dampening solution tank 15 taken and also the Kavitationsmischer 13 fed. In the cavitation mixer 13 the printing ink and the dampening solution are miscible to a stable ink-dampening emulsion, namely due to the fact that with the help of the Kavitationsmischers 13 generate locally high negative pressures and temperatures.

In the embodiment of 1 is the cavitation mixer 13 outside the printing units or printing units 10 and thus outside the inking units 12 arranged. The from the cavitation mixer 13 provided ink-dampening emulsion is according to 1 via common supply lines 18 the inking units 12 all printing units of the printing units 10 fed. It follows that in the embodiment of the 1 in all printing units of the printing units 10 the same printing ink is applied to the printing material to be printed.

If, on the other hand, a substrate is to be printed multicolored by printing in different printing units of the printing units 10 Different printing inks are applied to the substrate, so it is within the meaning of the present invention possible for all printing units of the printing units 10 in which the same printing ink is to be printed, in each case providing a common cavitation mixer in order to provide the corresponding ink-dampening solution emulsion centrally for these printing units. Thus, if the printing inks black, cyan, magenta and yellow are to be applied to a printing material in a printing press in autotypic se-tenant, it is possible to provide four cavitation mixers for the ink-dampening emulsions centrally for the respective printing units and thus To provide inking units. The four cavitation mixers are then preferably as in 1 shown, arranged outside the printing units of the printing presses.

in the Difference to the embodiment shown it is also possible in each printing unit in each case at least one cavitation mixer integrate. In the simplest case, this is in every printing unit Integrated Kavitationsmischer, preferably in the inking unit of the same. In this case, it is then separated for each printing unit within the inking unit of the respective printing unit, the ink-dampening solution emulsion provided, it is necessary to each printing unit on separate Supply lines to supply the ink and dampening solution. The Cavitation mixers are then preferably in the color box of Integrated inking unit of the printing units.

It is possible, too in a printing unit, namely in an inking unit to integrate several cavitation mixers. So is it z. B. possible to integrate in a paint shop a number of cavitation mixers, the the number of ink zones of the inking unit corresponds. This can then for each color zone of an inking unit a sujet accurate ink fountain solution emulsion to be provided.

In the printing press according to the invention, any cavitation mixer known from practice can be used. Preferably cavitation mixers are used, as they are known from DE 100 09 326 A1 are known.

With The present invention makes it possible to use separate dampening units to dispense in the printing of a printing press. This can the structure of printing units and thus greatly simplified by printing presses become.

The Invention can also be used in sheet-fed printing machines.

10

printing unit

11

printing tower

12

inking

13

cavitation mixer

14

paint tank

15

Dampening solution tank

16

pump

17

pump

18

supply line

Claims (7)

Printing machine, comprising at least one printing unit, wherein the or each printing unit comprises a transfer cylinder, a form cylinder rolling on the transfer cylinder and an inking unit cooperating with the forme cylinder, characterized by at least one cavitation mixer ( 13 ) to provide at least one ink-fountain solution from printing ink and dampening solution, which is supplied via the inking unit ( 12 ) of the or each printing unit can be applied to a positioned on the forme cylinder of the respective printing unit printing form. Printing machine according to claim 1, characterized in that the or each cavitation mixer ( 13 ) outside the printing units and thus inking units ( 12 ), wherein the corresponding ink-dampening solution emulsion via supply lines ( 18 ) the corresponding inking units ( 12 ) can be fed. Printing machine according to claim 2, characterized in that for all printing units in which the same printing ink is printed, in each case a common cavitation mixer ( 13 ) is available. Printing machine according to claim 1, characterized in that that in each printing unit in each case at least one cavitation mixer integrated, with ink and dampening solution via separate Supply lines fed to the printing units and in the or each integrated into the respective printing unit cavitation mixer to a Printing ink fountain solution emulsion are processable. Printing machine according to claim 4, characterized in that the or each Kavitationsmi scher is integrated into the inking unit of the respective printing unit. Printing machine according to claim 5, characterized in that that the or each cavitation mixer into a color box of the inking unit of the respective printing unit is integrated. Printing machine according to claim 5 or 6, characterized that per color zone a cavitation mixer in the inking of the respective Printing unit is integrated.