DE411411C - Positive etching process for deep and relief printing - Google Patents

Description

Positive etching process for deep and relief printing. The invention relates to the positive etching for low and high pressure and consists in that when erasing and drawing the line through one fed by the eraser needle (or pen) Color liquid visible. is made.

Fig. I shows the metal plate a, then the etching base b applied to it. c shows the erased line. The same is generated by the eraser needle (or spring), Fig. A, which is designed similar to an upside-down helical spring, but the tips of which do not spread apart due to the pressure.

This eraser pen has one for this in its upper: hollow arch Purpose besoA; -the produced liquid which during the erasure in the line flows and through it. the line. makes visible.

So far, the erasing process was used to make the erased line visible The following The metal plate was colored black and the pin line produced had then the metal paint; the image thus appeared as a negative, that is, light on dark and not dark on light, i.e. opposite to the intended image effect.

Another positive: process, the ground applied to the plate to be colored white to create a dark line (metal color of the plate), has been tried repeatedly, but always with a disadvantage.

Usually white chalk, cream white, was applied to the primed plate etc. slurried or coated with binding agent and then became the white layer, if it really should cover, so thick that the erased lines can be traced. the etching never lay close enough together, which is why the etched plate and its imprint are one had a different appearance than the picture drawn on the white background. Through the Etching, the white ground was destroyed or had to be done by some before etching Manipulation can be removed.

Other procedures too. with greasy make-up and powdered zinc white did not prove themselves. They had the disadvantage that the reason was due to the fat of the white make-up was deteriorating and permeating acid. Isi dlese too Color is always a bit too thick and has the disadvantage that correction is impossible or but is associated with great difficulties.

The present method avoids all of these disadvantages The following process is deep etching. On a surface that can be attacked by acids (copper, Zinc, etc.) becomes one that cannot be attacked by imaginary acid - transparent or light-colored - mass applied.

With the eraser pen (Fig. Z), the tip of which is shaped like a needle and does not spread apart when printing and when drawing on the metal plate a colored one (black) liquid flows out, is, as usual, made the drawing. The spring digs a groove in the bottom of the fat, into which she lets the colored (black) liquid flow in (see Fig. i). From the walls The watery liquid is repelled while the gutter of the fatty, bottom it sticks to the bare metal.

This creates a very fine, deep black line, the indicates exactly how much of the metal is exposed and etchable. Esteem. Here the procedure is the same, only one is applied on a washable base acid-proof ink or paint used. This makes it the perfect option created, during the process of erasing, the stage in to be able to judge its finished image effect. So it is an immediate one Working from nature or from imagination is possible with the certainty that the Imprint of the etched plate shows exactly the same picture effect as the etched one, but unetched plate.

Claims (1)

PATENT CLAIMS: 1. Positive erasing process for deep and letterpress printing, characterized by the use of an eraser needle which feeds a coloring liquid to the tip in a groove or in a channel, so that the tip is exposed to be etched; Metal colors and makes it visible. a. Method according to claim i for gravure printing, characterized in that the coloring liquid has the property of being washable. 3. The method according to claim i for high pressure, characterized in that the coloring liquid is acid-resistant.