DE266486C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

. - te 266486 CLASS. 57d. GROUP

FRANZ OTTENHEIMER in MUNICH.

Patented in the German Empire on May 25, 1912.

According to the inventor, the wrinkle grain of the collotype is in bright tones very small, and the individual grains (pressure points) are all the closer together, ever the tone is lighter. Mainly for this reason, the printable transfer is a Collotype image on letterpress and flat ■ plate material (stone, etc.) according to the view of the Inventor difficult and mostly impossible. the

ίο dark elements consist of point elements, that are bigger and a little further apart.

In the hand drawing is a bright tone would perform in the manner (by puncturing), that the clear-spaced tones with more _ _K. Dots, which represents dark tones by placing the dots closer together.

So there are the natural collotype and the hand drawing in this regard in a certain contrast. This contrast is eliminated if, according to the invention, a negative collotype form used for transfer printing and transfer printing in a known way of negative reversal reverses. Printing elements are then obtained which correspond better to those according to the hand drawing. - ■ '

Experience has shown that you can also make multi-color prints with savings in this way of time and plate material, and that instead of lithographic forms can also obtain letterpress and gravure forms in known ways.

Two exemplary embodiments of a reversal of a lithographic stone now follow below transferred negative collotype into a positive printing form.

1. The stone is peeled off, wiped with a damp cloth and the negative light pressure that comes with Transfer ink, mixed with vernis-mou, has been produced on transfer paper with repeated pulling through the press on the stone surface.

The transfer is gummed, then rubbed with grease paint, with rosin powder and talc smeared. Then the alum solution is not too strong, after a few Sprayed with water for minutes and dried. The print complex is then burned in, the edge of the picture with rubber etching Covered and after drying the area evenly with a fairly thin shellac solution Doused over. The dried shellac layer is washed out with turpentine oil, all printing elements dissolving. Now it is etched with light rubber etch and then rolled in with printing ink, which now adheres to the shellac particles and gives the positive image.

2. The polished stone is polished (prepared) with clover salt, the negative one Collotype printed, the printing complex wiped over with rosin or asphalt powder and talc and with a damp cloth rubbed off. The print complex thus provided with resin grain is burned with a blowtorch, the edge of the picture covered with asphalt varnish. It is then deacidified with alum solution, dried and the image area with

Claims (1)

coated with liquid lithographic ink. After 6 to 10 minutes it is rinsed off with water, dried and then cleaned the area with turpentine oil. Now is done with printing ink rolled in and, if necessary, the now positive pressure complex strengthened in the usual way. Pat ε ν t-An SPRU c H:
Process for the production of printing forms with collotype transfer, characterized in that a negative light print is transferred and then the printing complex on the plate is reversed into the positive.