SU1555188A1 - Method of packing fine-particle material in thermospliceable film - Google Patents

Abstract

The invention relates to methods for packing dispersed materials in a heat-sealing film that protects the welding site from dust, and can be used in the chemical, food, pharmaceutical and other industries. The aim of the invention is to improve the quality of packaging by increasing the strength and tightness of the weld. The method of filling the film sleeve with material 4 and forming a transverse weld 5 on the sleeve with discretely located perforated transverse weld joints on it involves the discrete processing of the film. The joints in the weld seam 5 are formed by means of spark discharges with a voltage exceeding the breakdown voltage of the film and in a pitch of 2-10 mm. As a result, cleaning of the film in the area of the spark sample is achieved. 2 Il.

Description

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The invention relates to methods for packing dust products into film casings, which protect the welding site from dust, and can be used in the chemical, food, pharmaceutical and other industries.

The aim of the invention is to improve the quality of packaging by increasing the strength and tightness of the weld.

FIG. 1 shows a weld; in fig. 2 is a schematic of an apparatus for carrying out the method.

The device contains electrodes 1, which are powered from a source 2 of pulsed high voltage.

The method is implemented as follows.

The film sleeve 3 is filled with the dispersed material 4, while on the film, which, in particular, can have an electrostatic charge, is deposited and sorbed

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The effect and breakdown of the film with an electric-spark discharge promotes desorption of mono-molecular layers of substances sorbed on it from the film surface, which significantly activates its surface and also increases the strength and tightness of the weld. Thus, the proposed method allows to obtain a strong and tight joint along the axes of the length due to the cleaning of the film from dust particles.

The maximum spacing of spark breakdowns is 10 mm due to the maximum diameter of the cleaned part of the film, and the minimum spacing is related to the strength characteristics of the seam. If the pitch between the points of impact of an electric spark above 10 mm is increased, there may be areas of poor weld inspection, which leads to a leakage of the package. Decreasing the spacing between points of spark breakdowns less than 2 mm weakens the seam as a result

the part of material 4, which prevents the reduction of the amount of polymer in the zone in the zone to the formation of monolithic transverse welding, weld 5 during welding. After the material 4 is loaded into the sleeve 3, the dusty zone of the seam 5 is passed at a constant speed in the gap between the discharge electrodes 1, which are sealed from a source 2 of pulsed high voltage. The frequency of high voltage pulses exceeds the breakdown voltage of the film and is chosen so that when the sleeve moves with material 4,

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For example, the discharge electrodes, the distance between the points of spark breakdowns is 5-10 mm. During the breakdown of an electric spark of two layers of film with dispersed material 4 sorbed on it, an opening with a diameter of 0.5 mm is formed, and around the opening an area with a diameter of 10 mm is cleaned 35 of dust particles. Removal of particles from the film occurs due to the weakening of the forces of the adsorption interaction between the particles of material 4 and the film and the change in the nature and direction of this interaction under the action of electric fields, as well as due to the vibration of the film in the sample zone and the localized shock wave produced by a high-voltage spark raz de.

After the electric-spark breakdown, the discretely-forged seam zone is welded using conventional irons using conventional technology, and during the welding process, due to perforation, the heat-sealing film has the ability to flow in all directions

The need to use sparks with a voltage that guides the breakdown voltage of a film is associated with the need to make microholes and a spark effect on the internal dusty surfaces of the film. Increasing the spark power may contribute to an increase in the diameter of the area being cleaned, however, partial burning of the polymer film is also possible, which does not always contribute to improving the quality of the seam.

Thus, the use of the proposed packaging method allows increasing the seam strength by 30% and ensuring its tightness, thereby increasing the quality of packaging of dispersed materials in a heat-sealing film.

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Claims (1)

Invention Formula The method of packing dispersed materials in a heat-sealing film, including filling the film sleeve with dispersed material and forming a transverse weld on the sleeve with joints located on it, characterized in that, in order to improve the quality of the package by increasing the strength and tightness of the weld, the joint on the weld form by means of spark discharges with the weld plane, which increases strength 50 by a voltage greater than the breakdown on the welded joint. In addition, film exposure, and a pitch of 2-10 mm. 0 The effect and breakdown of the film with an electric-spark discharge promotes desorption of mono-molecular layers of substances sorbed on it from the film surface, which significantly activates its surface and also increases the strength and tightness of the weld. Thus, the proposed method allows to obtain a strong and tight joint along the axes of the length due to the cleaning of the film from dust particles. The maximum spacing of spark breakdowns is 10 mm due to the maximum diameter of the cleaned part of the film, and the minimum spacing is related to the strength characteristics of the seam. If the pitch between the points of impact of an electric spark above 10 mm is increased, there may be areas of poor weld inspection, which leads to a leakage of the package. Decreasing the spacing between points of spark breakdowns less than 2 mm weakens the seam as a result reducing the amount of polymer in the weld zone, The need to use sparks with a voltage that guides the breakdown voltage of a film is associated with the need to make microholes and a spark effect on the internal dusty surfaces of the film. Increasing the spark power may contribute to an increase in the diameter of the area being cleaned, however, partial burning of the polymer film is also possible, which does not always contribute to improving the quality of the seam. Thus, the use of the proposed packaging method allows increasing the seam strength by 30% and ensuring its tightness, thereby increasing the quality of packaging of dispersed materials in a heat-sealing film. discretely Invention Formula The method of packing dispersed materials in a heat-sealing film, including filling the film sleeve with dispersed material and forming a transverse weld on the sleeve with joints located on it, characterized in that, in order to improve the quality of the package by increasing the strength and tightness of the weld, the joint on the weld form by means of spark discharges with FIG. 2