SU7217A1 - Method and device for displaying photosensitive papers with ammonia gas - Google Patents

Description

Some types of photosensitive paper, especially copying photosensitive paper, are manifested by exposure to gases; such is, in particular, the paper obtained under German patent no. 386433, the manifestation of which is produced with the help of some alkaline active gas, predominantly ammonia. This build-up is carried out in closed boxes, in which vessels are installed with ammonia solution, evolving ammonia gas. A similar occurrence lasts from 10 to 20 minutes. According to the author, it is possible to achieve a significantly faster appearance if the paper to be developed is slightly moistened with a developing liquid, in the presence of a producing gas. Wetting or wetting the paper; The side of the side on which the photosensitive layer is located should only be weak, as otherwise the paper shrinks and wrinkles, easily causing distortion of the drawing. It has been found, however, that this poorly moistened paper is sufficient for, especially in the presence of the developing gas.

achieve complete appearance in a significantly shorter time.

According to the proposed method, a developing liquid, for example, an aqueous solution of ammonia, is applied onto the developed paper with an impermeable, non-liquid-absorbing tape during their general movement, with a receiver containing an ammonia solution from which the developing liquid transferred to the designated endless belt with the help of a roller, placed inside a closed box. Thanks to such a device, the atmosphere inside the crate is also simultaneously saturated with ammonia gas.

The device used to implement the proposed method is schematically shown in the drawing.

In the box 1, four rollers 3 of smaller diameter and drum 2 of larger diameter are arranged to rotate; they are covered, according to the drawing, by an infinite, wide, non-absorbing fluid tape 4. In the reservoir 5, which contains the liquid necessary for the manifestation, for example, ammonia solution, the roller 8 rotates, its lower side dips into the liquid, and the infinite upper side touches tape 4. When the drum 2 rotates, the endless belt 4 moves in the direction of the arrows indicated in the drawing, bending all the rollers, and the roller 8 is also rotated by it. The surface of the latter carries the emitting liquid to the lower side is not capable of absorbing an endless belt.

If the paper to be produced is inserted through the opening 6 into the other 1, it will fall between the wetted side of the endless belt 4 and the drum 2, which will carry it along with itself and then again release it through the opening 7. Since only one side of the belt 4 and moreover, only to a slight degree, the paper leaves the device almost dry, so that after a few minutes it again completely dries in air.

As with the proposed method, paper production occurs in a very short time, the path it takes in the device can be very reduced, which provides significant savings in the device of guide rollers,

The subject of the patent.

1. A method for producing a photosensitive paper with gaseous ammonia, characterized in that the paper to be developed is pulled in one way and in contact with a tape moistened with a thin layer of developing liquid.

2. To implement the method specified in paragraph 1, a device, characterized in that it consists of: a) a box 1 provided with two openings 6 and 7 for feeding and removing developed fingerprints, b) guide rollers 3 in which the protruding tape of the impregnating tape 4, between which the drum 2 is printed, and c) of the developer tank 5 with the roller 8 inserted into it to transfer the developer with a thin layer on the inner surface of the dent 4.