SU1733949A1 - Method of express control of photoemulsion sensitometric properties - Google Patents

Abstract

This invention relates to a technique for sensitometric testing of photoemulsions. The purpose of the invention is to reduce the control time. For this, the liquid emulsion under study is applied to an opaque porous substrate impregnated with an interlayer, exposed from the substrate side, illuminated with inactive radiation, and the intensity of the scattered radiation is measured depending on the time of manifestation. 2 hp f-ly, 4 ill.

Description

The invention relates to sensitometric tests of photo emulsions and can be used in the chemical-photographic industry to control changes in the sensitometric properties of a photo emulsion during chemical maturation.

A known method of express control of the sensitometric properties of photoemulsions includes sampling a concentrated liquid emulsion, diluting it with a solution of gelatin, exposing the sample, mixing it with a projectile, illuminating the sample with non-actinic radiation, and measuring the optical characteristics during the process of development.

A disadvantage of the known method is the long duration of a full sensitometric analysis, due to the difficulty of imprinting several exposures into a liquid sample.

Closest to the present invention is a method for controlling changes in the sensitometric properties of photoemulsions, including applying a liquid emulsion to a substrate, styling an emulsion sample, exposing a sample, bringing it into contact with a pro- jector, illuminating non-actinic radiation from the emulsion, and measuring the intensity of scattered radiation.

However, this method is characterized by a lack of rapid control due to the duration of emulsion freezing and a low rate of onset at a temperature below the temperature of the gel.

The purpose of the invention is to reduce the control time.

FIG. 1 shows a diagram of the device that implements the proposed method; in fig. 2-4 - the curves of the sample

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emulsions applied to opaque porous substrates of various types.

The method of express control of the sensitometric properties of photoemulsions is carried out as follows.

During chemical ripening, a sample of the concentrated liquid emulsion 2 is taken from the cooking apparatus 1 and applied to the porous substrate 3 impregnated with the developer. On the other side of the substrate, the emulsion diffused into the substrate is exposed to light from lamp 4 through shutter 5. Then the exposed sample is illuminated with non-actinic radiation from source 6. The desired spectral composition of the measuring radiation beam (0, 0.65 µm) is extracted with an infrared filter 7. Non-actinic radiation using lens 8, it is focused on the area of the substrate on which the emulsion is applied, and using lens 9, scattered radiation is collected on the photodetector 10. The developer, with which the substrate is impregnated, interacts with With an emulsion, this changes the flux of radiation reaching the photodetector. The signal from the photodetector is processed by the electronic unit 11 and is fed to the recorder 12, which records the dependence of the signal from the photodetector 10 on the development time (manifestation curve). The appearance of one or several curves of the manifestation, corresponding to different exposures, determines the sensitometric properties of the photoemulsion and the change of these properties during chemical ripening.

Filter paper, cloth and other porous materials can be used as the substrate. The emulsion can be applied to the substrate both from above and below. In this case, exposure and measurement of the scattered radiation is carried out from the side of the substrate. The substrate impregnated with the developer can be mounted on glass or other waterproof transparent substrate. The porous substrate impregnated with the developer may be pre-dried.

Since in this method there is no gelation operation, the execution of which takes 30-40 seconds, the control time is reduced by 30-40 seconds. An even greater effect is achieved by carrying out the development process at an elevated temperature, which is unattainable in the known method. Thus, with an increase in the temperature of the emulsion from 25 to 35 ° C (at 35–40 ° C, chemical ripening usually occurs) the process of development is accelerated by 4–8 times.

When analyzing the sensitometric properties of photoemulsions, a substantial error (up to 15%) introduces an inhomogeneity of the surface of the emulsion layer, which is caused by the foam bubbles entering the surface. Since foam does not penetrate through porous materials, in the proposed method this source of errors is absent and, consequently, the accuracy of measurements increases.

In addition, in this method (p. 2), the exposure conditions are improved, since

The imprinted wedge can be installed close to a waterproof transparent substrate. This eliminates errors due to parasitic illumination of the emulsion reflected from the wedge.

radiation.

Example 1. White filter paper is impregnated with a UE-2 developer and dried. The impregnated paper is placed on the glass bottom of a glass with a diameter of 30 mm and pressed along the edges with a sleeve that fits tightly into the glass. The emulsion is melted, the microcrystals of which have an average projection area (S) of 1.2 µm 2, at 45 ° C. The molten emulsion is poured into a glass, exposed from the bottom through the glass bottom with a petal shutter from the camera.

Photodiode PD-24K measures the dependence of the intensity of scattered radiation on the time of manifestation.

FIG. 2 shows the appearance curves at different exposures: 0.1 1/30; 2 1/30;

4-1 / 30 (s).

EXAMPLE 2 A white filter paper is placed on the glass bottom of a glass with a diameter of 30 mm. Poured into a glass propulsion unit UP-2 and soaked the paper,

the remains of the wittel poured. Illuminate the bottom of the cup with a beam of infrared radiation from the AL-107 light guide. modulated with a frequency of 1 kHz, and collect the scattered radiation on the photodetector FD-24K. Melted down

0 emulsion, microcrystals of which have an average projection area of 0.66 μm2 at 42 ° C. The molten emulsion is poured into a cup, exposed from the bottom through the glass bottom of the cup with the help of a petal shutter from the camera. Change by radiation from a KGM-40 lamp. The signal from the photodetector is amplified, detected and recorded with the aid of the KSP-4 chart recorder.

FIG. 3 shows the curves of the manifestation at different exposures: 0.1; 1/30; 2 1/30; 4-1 / 30; 8.1 / 30 (s).

Example Measurements are carried out analogously to example 2, but white cloth (batis) is used as the substrate. The resulting curves are shown in FIG.

four.

The proposed method makes it possible to reduce the monitoring time by 2-4 times and simplify its process.

Claims (3)

Claim 1. A method of express control of the sensitometric properties of photoemulsions, based on the fact that a liquid emulsion is applied to a substrate, is exposed, brought into contact with a propellant, illuminated with a beam of non-actinic radiation, and the time dependence of the scattered radiation intensity is measured. effects on which the sensitometric properties of a photo emulsion, differing in that, are judged. what. in order to reduce the control time, the emulsion is applied on a porous substrate impregnated by the manufacturer, and exposure, irradiation with non-actinic radiation and intensity measurement scattered radiation is carried out from the side of the substrate. 2. The method according to claim 1. characterized in that. That the substrate impregnated with the propellant is fixed on the transparent for the exposure and non-actinic radiation to the waterproof substrate. 3. Method according to paragraphs. 1 and 2, characterized in that the substrate impregnated with the developer is predried. tf FIG. one ojs 0.5 R (yc / t. Erf) as 11.5 tnfflfirs /) fig 2 2 FIG 3 J t / ff / Wff)  yc / t.eef) 0.2 0.1 J in / mshG) FIG. four