DE1546776B1 - Cleaning fluid for the continuous cleaning of wiping cylinders in single or multi-color steel engraving machines - Google Patents

Description

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The invention relates to a cleaning solution, 2 to 10 percent by weight of an alkali liquid for the continuous cleaning of existing phosphate cleaning wiper cylinders in single or multi-color steel engraving media and 1 to 10 percent by weight of a network printing machine, means contains.

These wiping cylinders have the task of 5 Well, although they are in other technical areas Inking rollers on the printing plate or the engraving aqueous cleaning solutions based on alkali phosphate The paint applied to the th cylinder or the paint applied and with wetting agents for many years in the Colors in the pits of the printing plate of the most varied compositions are known and or the engraved cylinder and lent it. Nevertheless, in the literature there is about Planium, d. H. the non-printing surface except for steel engraving presses nowhere an indication that half of the stitch pits to be cleaned of paint. Which suggests that an aqueous solution is in place by that of the printing plate or the engraved one of the previously used organic agents of the type Cylinder removed paint dirty wiping of trichlorethylene could be suitable for that cylinder must be constantly under the aid of tough steel printing ink within seconds during its rotation of brushes that break against its jacket 15 on the surface of a common grind, to be cleaned in a cleaning bath, operating speed of the rotating mopping cylinder in which the mopping cylinder is partially immersed. to dissolve so far that they confessed to

The previously mechanically acting devices for cleaning such mopping cylinders, such as Bürb, are preferred The solvent used is trichloroethystene, properly drained from the surface of the wiping cylinder or an organic agent of a similar type that is removable. Obviously for many years a rapid and complete physical dissolution of the existing prejudice of the professional world against the front Color causes, whipped solution is obviously based on the

This advantage of good dissolving power, the fact that steel printing inks are water-insoluble

however, there are a number of disadvantages: borrowed, highly viscous masses are, in general

25 consist of three main components, a lacquer

a) Solvents of the trichlorethylene type ^{based on} vegetable oil or a resin varnish, from Rgs are very expensive and therefore from economical ^m . ^e ^ ^en _ff ^and i ^ea " ^s . ^em f carrier substance or a reason usually only in connection with ^filler , ^wle _T. for example- Calcmmcarbonat In a semi-automatic or fully automatic Iranian solvents of the type of chlorine-working recovery system for the ³ ° ^at ¥ . ^ens *** & * f ^e cleaning effect in a solvent-usable RECOVERY ^r ^ ^men "physical" resolution without wesenüiche incineration plant in turn also means a chemical kost- Umsezungen the components of Farbspielge investment, and also requires these ^fa * ^SQ - obviously, the experts consider special facility was the constant maintenance. & * ™ ^elne such "physical dissolution"

35 of the color mass by means of a suitable organic.

b) Since solvents of the Trichloräthy- solvent type lead to success, especially the Einlens evaporate quickly, one has to deal with the effect of the solvent on the color within with these solvents a certain amount of pre-moistened area of the wiping cylinder surface looks to prevail. This is why the with an operating speed of the wiper cylinder of 60 Trichlorethylene working wiper device 40 to 100 revolutions per minute only far less than in this respect too, it takes an increased half-second.

wall to constructive and air-conditioning It has surprisingly been shown, however,

Devices that have an unacceptably high ver that the proposed, inexpensive and health

Evaporation from the solvent bath avoids harmless aqueous solution in connection with bedern or must ensure that the content 45 known mechanical cleaning elements, both

to solvent vapor in the vicinity of the brushes, for example, for perfect cleaning

Machine does not exceed the permissible dimension. the surface of the wiping cylinder from the adhering

ν T ^ - ™ *, · ■ ι j TT, - 1 1 · j -j printing ink is well suited. In contrast to the

c) The surface of the wiping cylinder is made homely, depending on the dye and _{the water used e Lö} s _U ng according to the invention, a Disper Maschmentyp and, depending on its function as _{the sioQ} | _arbmass ^s _{e and} f _{of the oil Verseifl} f _gen first or second wiping cylinder with a _{soluble constituents under BiM Sa} £ _{e ng. Covered for} ^ 6n special layer. However, since Tn achievable cleaning effect is überraschenchlorathylen often otherwise as wiping material _{d owned h wesei} f _tli j _{that the nth} suitable layer matenals of plastics _{K to components with the} given, relatively more or less taps, the training is used ⁵⁵ ^ concentrations there what choice of practically usable layering materials _ig j _{t] i} ^ _{m emarten waj} . _Μ Exceeding na ien limit. these concentrations are by no means an amplification

or acceleration of dispersion formation and

The task of the present invention is to 60 saponification occurs, but rather a grounded, the cleaning effect worsened with the use of trichloro. The tendency to Ethylene or organic solvent-like dispersion formation will be less, and the Koagu-type to eliminate associated disadvantages, so that lation tendency of the already dispersed particles deserve Cleaning of mopping cylinders on an economic basis increases.

a lighter and simpler way is possible. 65 Also well-known cleaning fluids

For this purpose, a cleaning fluid is used to break up dirt crusts on pressure one Preform aqueous solution at 30 to 80 ° C, d. H. thus to dissolve those who have become hard beaten, the 1 to 5 percent by weight of an alkali color residue in which the linseed oil varnishes as

The main component of the printing ink is oxidized over time, the cleaning fluid can do according to the invention in no way suggestive, since on the one hand it is in any case an expensive organic Component, namely carbon tetrachloride or trichlorethylene must contain, and on the other hand When cleaning such printing forms, the duration of the action of the liquid is irrelevant plays. Experience has shown that such printing forms to be cleaned have to be cleaned for at least 15 minutes Handle these fluids in order to achieve a perfect Get Purge.

Since the cleaning fluid according to the invention contains only very inexpensive chemicals, Of course, all recovery and circulation systems can be dispensed with, since the aqueous solution can simply be poured away and replaced with fresh solution when the degree of soiling one has exceeded a certain value.

A particularly useful composition of the cleaning fluid according to the invention contains 1.5 to 2.5 percent by weight of NaOH, 2 to 5 percent by weight of Na ₃ PO ₄ and 1 to 3 percent by weight of sulfonated castor oil as a wetting agent.

Claims (2)

Patent claims: 1. Cleaning fluid for the continuous cleaning of mopping cylinders in single or Multi-color steel engraving machines, thereby characterized in that the cleaning liquid consists of a 30 to 80 ° C warm aqueous solution consists of 1 to 5 percent by weight of an alkali, 2 to 10 percent by weight of one from Alkali phosphate existing, commercially available cleaning agent and 1 to 10 percent by weight contains a wetting agent. 2. Cleaning fluid according to claim 1, characterized by the following proportions: 1.5 to 2.5 percent by weight NaOH, 2 to 5 percent by weight Na ₃ PO ₄ and 1 to 3 percent by weight sulfonated castor oil.