SU1393450A1 - Method of producing cartridge filtering element - Google Patents

Abstract

The invention relates to filtering and can be used in the semiconductor, microbiological and other industries. The aim of the invention is to improve the reliability of sealing the longitudinal seam of the filter element while reducing the filtrate impurities with organic compounds. The method includes the corrugation of a package containing a filter membrane placed between layers of structural materials, forming preforms of a heat-sealed package and sealing a longitudinal seam by welding the extreme corrugations of the package. A distinctive feature of the method is that before welding on the outer corrugations, the inner layer of structural material is removed along the entire length, and the sealing of the longitudinal seam is carried out through the ends of the membranes of these corrugations. 1 il. with (L

Description

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The invention relates to filtration and can be used in the purification of liquids from mechanical and biological contaminants in semiconductor, pharmaceutical, microbiological, food, chemical and other industrial sectors.

The purpose of the invention is to increase the tightness of the longitudinal seam with a decrease in contamination of the filtrate with organic compounds,

PRI m le p 1. In the manufacture of a cartridge filtering element, a package is preliminarily corrugated, consisting of two polypropylene perforated supporting grids, between which are placed on the outside a distributor substrate of thermally bonded non-woven monofilament nonwoven fabric and a filtration membrane Type nuclear filter based on a dacron film 5-10 microns thick. At the end of the package, along the entire length of the package, the internal grid is cut, the ends of the external grid are folded over, and the remaining ends of the membrane are welded on a thermo-impulse machine.

Example 2. A packet consisting of two polyvinyl chloride or polyamide filter membranes placed between two polymer-supported polyethylene-propylene block copolymer grids is crimped; the pore size of the outer membrane (when the bag is welded into the cylinder) is higher than the inner membrane . Then the internal reference grid on

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the outermost corrugation is cut, the outer one is folded over, and the ends of the membrane are connected by thermal pulse welding.

The drawing shows a diagram of the welding of the ends 1 of the membrane 2, placed between the outer 3 and inner 4 reference grids. For the production of welding, the ends of the external grid in the welded area are folded over, and the ends 1 of the membrane 2 are placed between the electrodes 5 of the thermo-pulse machine (not shown).

The invention makes it possible to increase the reliability of the sealing of the filter element and to reduce the contamination of the filtrate with organic compounds.

Claims (1)

Invention Formula: A method of manufacturing a cartridge filter element comprising corrugating a bag comprising a filter membrane placed between supporting layers of structural materials, forming corrugated bag blanks and sealing a longitudinal seam by welding extreme corrugations of the bag, characterized in that, in order to increase the reliability of sealing the longitudinal seam while reducing contamination of the filtrate with organic compounds; before welding, the inner layer of the structural material is removed along the entire length before welding. ala, and the longitudinal seam sealing is accomplished by welding the ends of the corrugation of the membrane.