CS270123B1 - Filter areal materials - Google Patents

Abstract

Filter plates and flat filter materials comprising an intermediate product, in addition to refined wood cellulose, bleached paper cellulose, calcined diatom earth, epoxide-polyamide bitumen or epichlorohydrin-polyamine polyamide bitumen. These materials can be employed for filtering liquid materials, in particular in the food industry and pharmaceutical industry field.

Description

The subject of the invention is filter sheet materials, in particular filter seals, used for the filtration of liquids, in particular for the filtration of food products, water and medicinal products in pharmacy and other industrial products. _to

So far, fibrous asbestos has been used to produce filter sheet materials and has been taken up by 8 other fibrous raw materials such as refined pulp, cotton linters, or more salty ingredients and chemicals. The amount of asbestos in the filter materials was up to 45 4% by weight (USSR, Pat · 533 385; Filtrox-Werke AG, St. Gallen, Schwiez: Corporate Letter Hike, 1976; Seitz - Werke, Bad Kreuznach, BRO: Corporate Literature, 1974 - 1979 Euzinger Union-Werke, Mannheim AG, BRO: Firemne literatura, 1974). The presence of b asbestos in filter materials 1 despite its excellent effects is undesirable because the finely released asbestos fibers have carcerogenic effects.

The proposed filter sheet materials, in particular filter thatch, are characterized in that they contain a half-fly, which is made from the fine fibers of the fiber plants (cotton liters, ropes, hemp), in an amount of 1 to 50% by weight; wood pulp containing? -cellulose over 92% by weight and white paper pulp in an amount of 5-984% by weight, wherein the ratio of wood pulp may be between 1: 1 to 4: 1 and calcined kieselguhr in an amount of 1 to 454% by weight and a polyamide-epoxy resin or polyamide-polyamine-epichlorohydrin resin in an amount of 0.3 to 1.5% by weight of the absolute dry (as) active ingredient.

Fiber raw materials used for filtering thatch and other filtering surface materials used for filtration of food and medical products are characterized by high purity, must not cause color haze, taste or aromatic defects · Calloated kieselguhr is characterized by high inertia to filtered media and water leachable content substances is a maximum of 0.34% by weight.

Filter-thatch and other filter-surface materials prepared from the aforementioned raw materials of variable composition. The fiber components, the granulometric composition of the silica, the amount thereof in the filter, are characterized by having a wide efficiency and filtration performance. According to industrial use, they are used for direct filtration of thicker and finer dispersions! to colloidal solutions. They are produced by conventional papermaking processes. The prepared pulp according to the marked furnish is rendered on a paper machine sieve, the sale is treated by pressing to the necessary depth and dried in a cylindrical and hot-air dryer to the final dry matter 944 + 24, - 14.

Example,.

From cotton lintter milled to 20 ° SR, scooped bleached eulfine softwood pulp and bleached softwood pulp in a ratio of 2: 1 co-milled in a mixture of no 22 ° 8R aa to prepare pulp, the ratio of cotton linters to 3 : first To the mass of the fibers, calcined diatomaceous earth is added in an amount of 804 wt. After diluting with white papermaking water to a concentration of 0.84, the papermaking is formed on the longitudinal sieve of the papermaking machine, the papermaking is wet-pressed and finally dried to a final dry weight of 944. After drying, sheets of the desired dimensions are prepared. The filter sheet materials produced have a basis weight of 1300 g / m ² , a depth of 3.5 mm with a pore diameter of up to 2.2 µm.

Example 2

Semi-fabric prepared from rope or hemp fibers is pulled and pre-grinded to 20 ° SR in January. Refined sulphite long fiber pulp, refined sulphate short fiber pulp and bisected long pulp paper pulp are added, the wood pulp ratio being 3: 1: 1 and the whole fiber mixture is ground to 24 ° SR, 0.8µ by weight is added to said fiber mixture. polyamide - epoxy resin as of the active ingredient, after thoroughly mixing the resin into fibers, 65% by weight of calcined diatomaceous earth is added and after thorough homogenization, the paper is diluted with papermaking water to a 0.4¾ concentrate and formed on a round sieve of a paper machine to a continuous belt. dry matter channels 95¾. When leaving the dryer, the desired size is prepared on a punching machine. The basis weight of the filter thatch is 1,150 g / m @ 2, the thickness is 3.5 mm, and the average pore size is 4.5 .mu.m.

Claims (2)

OBJECT OF THE INVENTION Filter sheet materials, in particular filter thatch, characterized in that they comprise a semisolid, consisting of fiber fibers of cotton linters, rope or hemp, in an amount of 1 to 50¾ by weight, of wood refined wood pulp containing? 6 -cellulose above 92¾ by weight, and bleached paper pulp in an amount of 5 to 98% by weight, further calcined kieselguhr in an amount of 1 to 45% by weight and polyamide epoxy, or polyamine epichlorohydrin resin in an amount of 0.3 to 1.5% by weight of the absolute dry active ingredient. 2. Filter sheet materials according to claim 1, characterized in that the ratio of refined wood pulp to bleached paper pulp in the mixture is 1: 1 to 4: 1.