DE7609978U1 - DEVICE FOR DETERMINING THE COVERAGE OF Gravure Inks - Google Patents

Description

Ge advises to determine the yield of gravure inks ^?

The object of the innovation is a device for determining the yield of printing inks, in particular of gravure printing inks. Such colors of different tint show depending on the manufacturer and suppliers also have different yields due to their different structure. Understood by productivity the amount of ink that is required to print a defined area of a substrate.

To this day there is still no simple and quick method to test the yield of deep dz'uck colors. In practice, the procedure is such that, for example, prints when comparing two competing offers one half of the Druckaufla.ge with one and the aweite half with the other color, this approach is inadequate in that it niciit to Praxisnaschinen is able to keep the pressure conditions really constant. Lie margins of error of such

Dr. REINHOLD SCHMIDT, 7603 OPPENAU, PO Box 25, Allmendplatz 4, Telephone | O78O4) 710

Accounts: Rencfatilbank c C,; Volh »b.nkl Oppcn .. · .. BLZ 664913001 648 / Sp« rki »e Renchtal Oppeoiu IBLZ 664 523 66) No. 18 0053IC / Poitsdicckkto .: Karliruhc 650 15-752 MUncboer BUio Patentanwälte L 1 CHT, HANSMANN, HERBMANN

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Procedure are at least - 10? Ό, what a real one Price comparison of two competing offers is much too big.

The object of the innovation is to create a test device that allows yield determinations to be carried out quickly and easily, the error limit a ^ er of which is far lower, in particular of the order of magnitude of at most 2 to 3 ^c , i. The device should also allow other influences that go into the ink transfer and thus into the ink consumption to be precisely determined and compared without difficulty, for example influences of different printing materials.

Di'iC? Av.f ^?. ·? 9 ι ö R + o-ioh wi-ptofna-i'tl inh lnsfin. if one departs from the usual construction of Jiefdruckmaschinen with permanently stored in represents machine-pressure cylinder and at these heranfahrbarem, so movably stored impression roller and now reversed the impression roller firmly superimposed, this but the light as possible formed impression cylinder together with the continuously cooperating with it Einfärbeorganen loosely superimposed so that these parts, which represent the actual intaglio printing unit, can be easily and, above all, so quickly placed on an upper-shell scale and weighed immediately before and after the printing process that, as is well known, very fast

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Evaporation of the gravure ink is not a significant error, and the determination of the yield does not result in errors. This new combination of the parts "intaglio printing unit ¹¹ and" upper-pan scales ", which are assembled to quickly put them on and take off again, ideally solves the problem of determining the yield of intaglio inks, which has so far only been poorly dealt with.

First, the loose printing unit filled with printing ink, consisting of an ink fountain, printing cylinder with an etched printing surface, is weighed and squeegee device. Then the printing unit is brought into gear connection (preferably 1: 1) with the driven one Impression roller over which the printing material (e.g. paper) runs. Now you make a certain number of test prints with exactly known printed area, then again separates the drive connection between printing unit and impression roller and weighs the mentioned printing unit again. Aua this is During the printing period, a part of the filled printing ink has been used up. The weight difference from the Weighing before and after the printing process shows the yield of the color in relation to the printed area.

According to the innovation, a device is used to carry out the described measures, in which a light, driven pressure

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cylinder, ink fountain and squeegee device existing rotogravure printing unit movably mounted between a fixed upper-shell scale and a fixedly mounted driven impression roller and optionally can be set down on the scale or pen the impression roller can be pressed. In order to increase the sensitivity of the determinations, the pressure cylinder, which can be coupled to the driven stationary iresseur by means of a gear connection, is not only small, for example 4.5 cm wide and 8.5 cm thick, but also hollow. The drive gears of the cylinder are also made of light plastic textile material, and the paint box is expediently made of light metal. An operating lever that can be engaged and disengaged is used to lift the gravure printing unit. A spring can be used to move the movable printing unit against the printing material, which is guided past by the fixedly mounted impression roller. However, it has been found to be particularly useful that an eccentric lever with an adjustment handle is used to lift the gravure printing unit from the balance and to press it against the impression roller.

The design and mode of operation of this "rotogravure rotary press on the scales" ¹ , which is intended for the yield test, is described below with reference to the schematic drawing:

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The, .back cylinder 5 down on a bearing shell 4 on the paint box 2. To clipsei :; int aunh aie hook device 7 attached, iinti .lebe! ο i nriciituri ·· 5 aient to solve the aforementioned Drucka.-vre.ai from; he actual machine (on the drawing aurcn aurcn an Aannientei 1 y indicated), so a ^ d it to a Jbrfrsc. '.' ilii c ., aage 1 can be put on »

vie ranze ^ inrioritun ,; including the filled in printing ink -.: is at. r weighed inside the ϊεεΐε, then lifted from the v / aagschale by means of the one-sided lever 5 pivoted on the Kaschinerirannu-'r: 9 with nano handle and eccentric 6 and with the appropriate price pressure against the fixedly mounted arigetri'roerinn. as usual ζ.'ή. made of hard rubber, polyurethane Kateriai or aergxeicnen oesxerienüen rrwsr.ur 5 pressed and locked, whereby the gears on both sides come into engagement. Then one or two thousand impressions (cylinder revolutions) are made.

The printing cylinder has an etched area which corresponds to a square decimeter, i.e. the printing width 4 cm, the cylinder width is 4.5 cm, the diameter of the printing cylinder 8.5 cm. At a thousand pressure (cylinder revolutions) an area of 10 square meters is printed. This takes place at a printing speed of 2m / sec, within

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125 seconds. For a full surface, one can assume a dry ink weight of 2g / m², so that since the printing ink consists of 50% solvent in the liquid state, an amount of ink of around 40 g (liquid) is required for the 10 m².

With a reading accuracy of 0.1 g on the upper scale, e.g. a "Mettier" scale, differences in consumption may occur can easily be determined with the required accuracy.

iiach completion of the printing test, the printing device is reset to the "pan and weighed again. The difference between the two weighings is exactly the square for the 10 volume of ink required yielded as the first V / ägung before printing 5.000 kg and the second V / ägung. after printing 4.973 kg, the ink consumption was 27 g.

In this way the yield of a printing ink can be determined on the one hand, and also very easily on the other hand the influences that occur in the color transfer and thus in the .e'arb consumption.

Protection claims:

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Claims (2)

Protection claims 1. Device for determining the yield of gravure ;? colors, characterized _f that a light, off drivable printing cylinder (3), ink fountain (2) and Squeegee device (7) existing gravure printing unit movable between a fixed, upper-pan scale (1) and a stationary driven impression roller (8) mounted and optionally deposited on the scales or can be pressed against the impression roller. 2. Apparatus according to claim 1, characterized in that the printing cylinder is hollow and can be coupled to the driven stationary impression roller by means of a gear connection is. Device according to claim 1, characterized in that Aage and Abneben of i'ie f α jerk plants s of the v / for pressing against the impression roller, a cam lever (5) with adjustment 'Handle (6) is used. 7609978 09/30/76