SU402191A1 - METHOD OF DRAWING A FILM OF THE MATERIAL FOR PRESSED PREPARATIONS - Google Patents

Description

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The invention relates to panesypia coating pa extruded blanks or articles, for example, tablets, with the use of film-forming materials.

There is a known method of depositing a film of a material on extruded blanks by mixing them in a rotating drum and spraying a solution or suspension of the applied material, followed by drying the resulting film with gaseous body coating. A major disadvantage of this method is the need to create a cloud of material sprayed in the form of the smallest droplets for the coating, and thus not only the blanks are covered with a varnish, but also the inner surface of the drum walls, suction air ducts and the surrounding environment. This leads to a significant increase in costs.

In order to reduce the consumption of gaseous coolant and the applied material according to the proposed method, the solution or suspension is sprayed with gaseous coolant introduced directly into the layer of workpieces being processed. Under these conditions, fine sprays 11H) 1e liquid particles are pressed onto pressed blanks, which eliminates the loss in some cases of an expensive suspension for varnishing and contaminating the drum itself and the environment.

FIG. 1 and 2 illustrate the proposed method.

In a curved immersion tube 1, an outlet is located almost in a vertical plane, in the middle of which is a spray nozzle 2 (Fig. 1).

FIG. 2 and a vertical submersible pipe with a hole 3 located in a horizontal plane. The holes are opened in the direction of rotation of the drum to make dragees (shown in the figure). The displacement nozzle 2 is fixed inside the immersion tube at the lower hole in such a way that the plume of the sprayed liquid comes out almost in the direction of movement of the pressed blanks. In this case, the inlet tube 4 of the nozzle is fixed on the outer surface of the immersion tube. In order to achieve a particularly uniform coating, it is advisable to supply a stream of drying air, and with it a stream of thinly sprayed varnish of lacquer in such a direction of the wall, which would approximately correspond to the movement of the pressed blanks under the influence of rotation of the base.

drum and power of tinplate. With the known drum coating method, separate nozzles need to be used to limit the size of the plume of the sprayed liquid, while the proposed method allows one to restrict one nozzle.

A particular advantage of this method is the possibility of applying lacquer to individual tablets in a strictly predetermined quantity. This allows the introduction of highly physiologically active substances into the composition of the lacquer suspension and to precisely dose them.

Subject invention

The method of applying a film of material to extruded blanks by moving them in a rotating drum and spraying the solution or suspension of the applied material with the subsequent substance of the resulting film with gaseous coolant, characterized in that, in order to reduce

the flow of gaseous coolant and the applied material, the solution or suspension is sprayed with gaseous coolant introduced directly into the layer of workpiece being processed.

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