CS247271B1 - Device for heating and digesting photographic emulsions - Google Patents

Abstract

The efficiency of heating and digesting photographic emulsions is achieved by a device consisting of a high-frequency dielectric generator with terminals to the working electrodes and containers for the emulsion batch.

Description

247271

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to devices for heating and digesting photographic emulsions.

Up to now, heating and digestion of photographic emulsions has been carried out in the pots, or in duplicate vapor supply or hot water by means of pipes, by injecting the temperature transfer method. The emulsion must still be stirred in the pot or in the containers, usually by rotating 100 to 300 X per minute. Small batch production needs a lot of space. It is not possible to guarantee rapid and uniform heating of the whole batches in large volumes, as desired in the uniformity of the product. At high propeller speeds, centrifugation of the emulsion grains, foaming and emulsion spraying also occurs by rapid centrifuging, and the emulsion may be thoroughly mixed in some parts of the vessel, such as, for example, in the discharge valve, digging is not uniform. noisy, which circumstance is not desirable for operators.

At the first, second, possibly further digestion and heating it is important that the emulsion charge is heated uniformly throughout its volume from about 10 ° C to 70 ° C in a short time. Upon sufficient heating of the emulsion, it requires cooling of the entire volume during manufacture, which is according to the state of the art associated with the deterioration and the loss of working time.

The aforementioned drawbacks are eliminated by the apparatus for heating and digesting photographic emulsions according to the invention, which consists in that it consists of a high-frequency dielectric generator with outlets to the working electrodes as well as containers for charging the emulsion.

According to one embodiment, the high-frequency dielectric generator outlet terminates with a metal electrode mounted below the sliding belt, the second generator outlet terminates in electrodes mounted above the sliding belt and above the batch-emulsion material, the low-loss material.

According to a further embodiment, one outlet of the high frequency dielectric generator is conductively bonded to the metal container of the fume hood, which represents one working electrode and the other outlet terminates in the electrode as the second working station, submerged into the emulsion batch.

The devices disclosed herein achieve uniform heating throughout the volume of the emulsion because the dielectric field acts simultaneously in the entire volume and the heating does not start from the container wall. The high frequency generates an internal friction in the dielectric and thus generates heat at the same time in the entire volume of the charge. The heating rate increases many times, the losses are reduced, thermal and chemical reactions accelerate.

The heating is regulated by the generator itself by the apparatus, by switching off the current through the electrodes. The interruption of the high frequency current results in immediate heating interruption. Emulsion charge vessels are transferred to the cooling room. The production process accelerates. Preferred dielectric parameters of the photographic emulsions, such as the permittivity values ε and the loss angle tg S, allow the simultaneous, that is, the loss number ε. tg δ was highest, which is required to achieve the heat output of the generator. The power of the high-frequency source, as well as the frequency and voltage, are adapted to the charge volume and to the desired heating speed.

FIG. 1 shows a container of side-view rollers, FIG. 2 shows a slide with a container of view, FIG. rod electrode container in outline. Container 1 of low loss material ε. tg δ (Fig. 1j on the wheels 4 of the emulsion feed 5 is moved between two electrodes 2 and 3, which are fed by a co-axial cable or conductors from a high-frequency dielectric source 7.

Emulsion S feed containers 1 (Fig. 2) are mounted on sliding belt 10, outlet 8z of generator 7 ends with electrode 9 settled by sliding belt 10, outlet 11 ends with electrodes 12 and are mounted over containers 1 which are moved from the "A" spaces. to the "B" area of the cooling surface 13. The outlet 14 of the generator 7 (Fig. 3) is a conduit 15 connected to the metal container 16 and the second outlet 17 of the generator 7 ends with a metal electrode 18 embedded in the charge e - mules 5.

Claims (3)

247271 PREDMET An apparatus for heating and digestion-emulsion emulsions, characterized in that it is dispensed from a high-frequency dielectric generator (7) with outlets (8) to the working electrodes (2, 3) and from the emulsion charge vessels (1). 2. Apparatus for heating and digestion emulsions according to claim 1, characterized in that the outlet (8) of the high frequency dielectric generator (7) ends with a metal electrode (9) mounted below the sliding band (10). and the second outlet (11) terminates in the electrodes (12) above the sliding belt and the invention over the emulsion feed containers (1) (5), the low loss number material (ε-tgO). 3. Apparatus for heating and digestion-emulsion emulsions according to claim 1, characterized in that the outlet (14) of the high-frequency dielectric generator (7) is conductively bonded (15) to the metal container (16) of the hood as the working electrode. the second outlet (17) terminates in a metal electrode (18) as a working electrode (18) embedded in the emulsion batch (5). 2 sheets of drawings