DE1154999B - Filter cloth made of porous, random fiber fleece impregnated with a binding agent for dust separators, gas filters and air purifiers - Google Patents

Description

Filter cloth made of porous, random fiber fleece impregnated with a binding agent for dust collectors, gas filters and air purifiers It is known as filter cloth for the separation of dust from air and industrial gases not only fabrics but also nonwovens from vegetable, animal or mineral natural fibers or from to use inorganic and organic synthetic fibers (man-made fibers). To such To give fiber fleeces for filter purposes cloth-like, self-supporting properties, They are impregnated with a binder, causing the fibers to cross at their points of intersection be connected to each other.

With the help of these known filter materials it is possible to To dedust air or industrial exhaust gases so far that with samples with a certain Test dust the clean gas only has a residual dust content of 4 mg / m3. Will However, an even greater purity of the air or the gas requires, so prepare the fulfillment of this condition difficulties. You can of course get the cleaned one Send air through one of the above filter materials again.

However, only a little of the mostly very fine residual dust is captured, since the latter easily buzw through the pores. Channels carried through between the fibers will.

It has now been found that the degree of dust separation is essential (under otherwise the same conditions in terms of flow velocity, air resistance, type of dust etc.) can be increased if a filter cloth is used in which the cardable Fibers glued together at their crossing points with the binder are that the binding agent is lamellar (like swimming skin) over the gusset (Angle) of the fiber crossings tensions, these binder membranes predominantly lie roughly parallel to the surface of the filter cloth. In these filter cloths according to the invention The particles floating in the air often collide with those between the fiber crossings lying binding membrane on, whereby their deposition is favored.

Serve as fiber material for the filter fleece according to the invention monofilament, cardable synthetic fibers, which optionally contain natural fibers only can be admixed in a small proportion.

The membranes are formed when natural or synthetic rubber is used as a binding agent, Synthetic resins or a similar film-forming adhesive with a wetting agent used, it is important that the binder is opposite to the fiber material materially different, so a different surface tension during impregnation the binder solution works.

The position of the binding agent membrane is kept parallel to the surface of the filter cloth by pressing the fleece while squeezing off the excess solution.

During the subsequent usual heat treatment for vulcanization or hardening of the impregnating agent and drying out of the solvent remain get the binding membrane.

The invention is shown schematically in the drawing. The illustration shows, in high magnification, a section from one designed according to the invention Air filter fiber fleece with several fibers 1 to 4 crossing in one plane, which are glued together at their crossing points by the binding agent. Thin Binder skins 5 stretch lamellar over the gussets of the fiber crossings and act as additional baffle and deflection surfaces. As also from the drawing is apparent, these gusset 5 at the same time result in a labyrinth-like ramifications the pores, which is advantageous for the separation of the finest suspended particles.

Claims (1)

PATENT CLAIM: Filter cloth for dust separators, gas filters and air purifiers, made of porous, random fiber fleece impregnated with a binding agent, whose monofilament, cardable plastic fibers at their crossing points by the binding agent are glued together, characterized in that the binder is lamellar (like a swim skin) over the gusset (angle) of the fiber crossings, whereby these Binder skins are predominantly roughly parallel to the surface of the filter cloth.