DE2355393A1 - SYSTEM FOR REGULATING THE DAMP WATER MIXTURE OF A DAMP WATER TREATMENT SYSTEM OF OFFSET PRINTING MACHINES - Google Patents

Description

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Attorney File 24 529 'November 6, 1973

ViIPAG machine factory, Bern

Plant for regulating the dampening water mixture of a Fountain solution treatment system for offset printing machines

It is a device for supplying dampening liquid become known, in which a reservoir and a · metering device for the caustic solution, a mixing chamber for Mixing the caustic solution with water and the moistening liquid box are connected to one another via a controllable line system, with the dosing device as a dosing container is designed with a device for adjusting the amount of caustic solution to be dispensed by him and in the mixing chamber a liquid level regulator is provided, which with the help of solenoid valves, the supply of the caustic solution from the Dosing container and the supply of water into the mixing chamber by means of a water jet pump as well as the humidifying liquid from the mixing chamber into the humidifying liquid box of the plate cylinder delivering pump controls.

The device mentioned has a complicated, expensive line system with multiple pumps, which requires a great deal of cleaning effort. For large systems, the device is too not very efficient. There are many manual corrective actions to undertake. Regulatory control is only possible with indicator paper possible. Sometimes the fountain solution in the printing units is changed in the pH value by the paper and not ' compensated by more or less caustic solution.

409821/0352

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The object of the invention is to create a system which makes it possible to achieve the desired pH and Preset alcohol range, an automatic, ongoing Control with registration and to ensure constant regulation of the set values during operation.

This object is achieved according to the invention in that a crystal sand filter and a Circulation pump is connected, through which the fountain solution is filtered and partially fed to the printing unit as well as is fed back into the fountain solution, whereby a flow measuring electrode, a line recorder, a regulator for acid regulation, a regulator for alcohol regulation, a differential pressure transmitter, a ρΗ-1-meter and switches assigned.

The drawing illustrates an illustrated embodiment. It shows

Fig. 1 is a side view of the plant. Fig. 2 is a partial plan view of the plant 3 shows an instrument arrangement

With 1 is the double container for receiving the fountain solution 2 and des-fountain solution additive 3 designated. In the holding part there is a float switch 4 for the dampening water mixture and above the container part for the dampening water additive an injector 5 mounted with a suction pipe 6 and with the same a flow monitor 7, I-solenoid valves 8 and 9 and Lines are arranged and a crystal sand filter 10 and a circulation pump 11 are connected to the line system,

09821/0 3 52

The dampening water mixture 2 is filtered through polygamy and partially fed to the printing unit and into the dampening water tank is returned, wherein a flow measuring electrode 12 and in a switch box 13 a line recorder 14, a controller 15 for the acid regulation, a controller 16 for the Alcohol regulation, a differential pressure transmitter 17 pH meter 18 and switch 19 are assigned. The supply line to the damp box is with 20 and the return line designated by 21. . ·

For whose alcohol percentage is an unmarked one Special device, consisting of a diaphragm pump, two dosing devices, a measuring transducer on which the differential pressure transmitter 17 is connected, arranged.

The mode of operation of the system according to the invention is as follows:

The pH flow meter electrode 12 measures the acid content the I-iessstrom obtained is controlled by the regulator 15 on which the fourth received is also displayed. This is ¥ output from the chart recorder 14, which is connected to this measuring line, recorded so that in the event of an irregularity, the strips can be used for control purposes.

The float switch 4 also monitors the automatic control. If the level in the dampening water tank drops, the float switch switches the control on. The controller opens the valve for water or acid. V / ater is admitted directly through the inflow valve. The acid is sucked in with injector 3, i.e. with water from the acid tank and so added to the fountain solution.

With a switch that has three switch-on divisions, water, Normal running and acid, the addition of water and acid can be regulated even more finely. With that one reaches a practically unchanged one . "pH" value, during operation.

409821/0352

The alcohol percentage is determined by the special facility and the Differential pressure transmitter measured. The announcement takes place on Regulator 16, which also controls the alcohol flow valve. The line recorder also registers this value on the paper strip. The alcohol flow valve remains open until the set Value is reached.

Claims (1)

PATENT CLAIM: System for regulating the dampening water mixture in a dampening water preparation system of offset printing machines, which consist of a double container for holding the fountain solution additive consists, with a float switch in the container part for the dampening water mixture and a float switch above the container part for the dampening water additive an injector with suction pipe is mounted and connected to the same a flow monitor, solenoid valves as well Lines are arranged, characterized in that with the line system a crystal "! Sand filter (10) and a circulation pump (ll) is connected, through which the fountain solution (2) is filtered and partially fed to the printing unit and into the Fountain solution tank is returned, with a flow meter electrode (12) and in a switch box (13) a line recorder (14), a controller (15) for acid regulation Regulator (16) for regulating alcohol, a differential pressure transmitter (17), a pH meter (18) and a switch (19) assigned. M3CHIIEEPABRIK WIFAG 409821/0352