DE1794536U - DEVICE FOR PRODUCING DIRECT POSITIVE IMAGES USING THE SILVER SALT DIFFUSION PROCESS. - Google Patents

Description

Procedure and. Device for the production of direct Positive images using the silver salt diffusion process. For the production of direct positives after the silver salt diffusion process, a photosensitive halogen silver layer is developed according to the method of French patent specification 879, 995 after exposure in close contact with a transfer layer in the presence of a halogen silver solvent at least partially dissolves in the developer and diffuses into the transfer layer, where it is developed into a correct-laterally positive image of the original. To carry out this process it is necessary that the aforementioned layers are wetted separately with the developing liquid and then wetted are pressed together. In general, the two layers are C> After a short contact time they were separated again and then dried individually. in German patent 1.003. 580 describes a process according to which the negative and positive layers which are in contact are first, e.g. B. dries hot and then ej-nanderteilnt, which makes the process easier and faster will. This patent also specifies devices with the aid of which the hot drying can be carried out.

These devices correspond in principle to a drying drum, as is generally used for drying photographic papers. The positive and negative layers remain until completely dry under a certain pressure in con- clock. These devices are relatively extensive and need a lot of space.

Since in this device the two papers to the end under If there is a certain amount of pressure, the layers adhere very firmly to one another and are difficult to separate mechanically.

It has now been found that when the papers are hot-dried, the Separating the two layers can be made much easier if you look at the papers after leaving the pair of press rollers of the developing device between one or several heated roller pairs passes through it. When using one or more pairs of heating rollers may be useful, the rollers of one or each Heating roller pairs and, if necessary, also the individual heating roller pairs with one another to heat to different temperatures.

Finally, it is also possible to use the pair of press rollers of the developing device to be designed as a pair of heating rollers.

The rollers can be heated, for example, by hot air, steam, electrical resistances, lamps or infrared emitters.

Not all layers that use the silver salt diffusion process are suitable for hot drying be used. For example, layers in the German Patent 1, oil3,965.

In the figures, embodiments of the drying device in Combination with a developing device, for example in section, shown.

The device shown in Fig. 1 consists of a conventional development device 6 for the diffusion process and a drying device attached to it a pair of heating rollers. The end shields 2 attached to the base plate 1 are used the storage of the pair of heating rollers 3. The web 4 guides the papers from the pair of press rollers 5 of the developing device 6 to the pair of heating rollers.

The device shown in Fig. 2 consists of a conventional development device 10 for the diffusion process and a drying device attached to it several pairs of heating rollers. The end shields 2 attached to the base plate 1 serve to support the pairs of heating rollers 35.

The webs 6,7,8 guide the papers from the pair of nip rollers 9 des Developing device lo through the pairs of heating rollers.

The device shown in Fig. 3 consists of a conventional development device for the diffusion process in which the pair of press rollers of the developing device is designed at the same time as a pair of heating rollers. The developer container is on the base plate 1 8 attached. It also carries the end shields 2, in which the press-heating roller pair 3 and z. B. two further pairs of heating rollers 4, 5 are mounted.

The webs 6, 7 pass the paper on between the roller pairs. It can also be useful4 to use the drying device with a j, 2 e «7H 4 g Development device, for example according to DDr ......... Note. 9147c, in which the positive paper is is neither not moistened at all or only moistened on the front. at Use of suitable layers, for example according to DBP 1013965 the moisture requirement is relatively low.

The drying devices described are also suitable for other transmission methods usable in which an image of a layer during or after the development process is transferred to another layer.

Claims (1)

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