DE1051813B - Process for the production of edge-fixed filter layers from organic and / or inorganic fibers - Google Patents

Description

GERMAN

The invention relates to the production of edge-proof filter layers or filter cardboard from organic or / and inorganic fibers.

Filter layers are put under pressure in the filter press in order to achieve a good edge seal pressed against the support points, with a considerable mechanical stress at these points of the layer structure occurs. Too much stress leads to the tearing of the filter layer, we said pressing the layers under too little pressure causes the filter device to leak.

Processes have already become known which strive to consolidate the entire layers, by means of chemical agents such as melamine or urea dispersions or solutions. These effect however, only one or both surfaces of a layer are secured against detachment Fibers. The inside of the layer between these two surfaces secured against fraying may, however, be used cannot be affected by the treatment with chemical agents, because this would reduce the porosity and elasticity of the filter layers are severely impaired.

In addition, with these treatment agents, since they do not spread through the entire thickness of the layer, but only extend on their surfaces, a noticeable increase in mechanical strength can not be achieved, the wet strength of these filter layers is smaller than that Dry strength.

It is also known to soak the edges of the layers with paraffin and the like good edge sealing is achieved, however, due to the brittleness of these areas, there is an increased tendency to the edge break occurs. It is also known to have a filter surface on both sides of its edges To cover plastic strips and to connect these strips together through the fabric.

In contrast, filter layers made of organic and / or inorganic fibers, which also Filter aids, such as kieselguhr, kaolin and the like, can be mixed in according to the invention in such a way that that on the mechanically particularly highly stressed parts of the filter layers, z. B. on their edges, the porosity and elasticity of the layers are applied, which leave unaffected anti-wetting agents. According to the invention, a dispersion or dispersion which is drawn into the layer and penetrates it is used for this purpose Solution of silicones applied and dried.

After this, these substances became water-insoluble and were continuously impregnated in this way Locations of the filter layers are affected by the liquid

of edge-fixed filter sheets

from organic and / or

inorganic fibers

Applicant:
Enzinger - Union -Werke

Stock corporation,
Mannheim, Neckarauer Str. 138/162

Reinhold Bock, Wallau / Lahn (district of Biedenkopf),
has been named as the inventor

not wetted and have an unchanged elasticity as well as their during the filtration process Dry strength, which not only presses the contact pressure and thus the tightness of the filter press can be increased, but also the durability of the layer by avoiding edge tears and the like is increased. Furthermore, this is compared to known edge seals Filter surfaces avoids thickening at the edges.

Claims (2)

Patent claims: 1. Process for the production of edge-fixed filter sheets made of organic and / or inorganic fibers to which filter aids are also added can be, characterized in that the filter layer on the mechanically particularly highly stressed areas with porosity and elasticity of the layer unaffected by anti-wetting agents is impregnated. 2. The method according to claim 1, characterized in that a is absorbed in the layer ^1, and they applied penetrating dispersion or solution of silicones and dried as anti-wetting agent. Considered publications:
German Patent No. 859 141;
Austrian Patent No. 71 730;
German patent application S 26512 IVc / 12 d (published on July 30, 1953). © 809 768/328 2.59