Method of producing an adsorber filter body

Details Method of producing an adsorber filter body Method of producing an adsorber filter body

1998-08-31

1999-12-21

Stemmer, Daniel

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Utilizing diverse solid particles

55524, 264123, 264DIG48, 2105101, B01D 3914

Patent

active

060044950

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a method of producing an adsorber filter body.


BACKGROUND OF THE INVENTION

Filter bodies comprising adsorber particles tightly connected to each other by an adhesive, with the filter bodies having through passages, have hitherto been produced for example by an extrusion process, as is described for example in EP 0 492 081 A1. For that purpose the adsorber particles must be mixed with a plasticising agent. That mode of manufacture requires an extrusion apparatus which is expensive to buy. For that reason an extrusion apparatus of that kind is not suitable for the production of relatively small numbers of filter bodies comprising adsorber particles and having through passages therein, because the purchase price of the apparatus would have an excessive influence on the price per item of the filter bodies.
DE 40 34 798 A1 discloses a method of producing an adsorption flat filter comprising an air-permeable carrier in web form, on which a melt adhesive is applied in uniformly distributed fashion, but only partially covering the surface of the carrier, whereupon adsorber particles are fixed to the adhesive. The melt adhesive used in that known method is a reactive polyurethane-based melt adhesive which cross-links under the effect of moisture in the air and/or moisture of the carrier. As cross-linking of the adhesive does not take place at elevated temperatures, it is possible to use temperature-sensitive materials both for the carrier and also for the adsorber particles.


SUMMARY OF THE INVENTION

An object of the present invention is to provide a method of producing an adsorber filter body with which adsorber filter bodies with through passages can be inexpensively produced in a simple fashion.
Another object of the invention is to provide a method of producing an adsorber filter body having passages therethrough, which can be carried into effect by simple apparatus structure which also affords versatility of operation for producing different forms of filter bodies.
According to the invention those and other objects are attained by a method of producing a filter body comprising adsorber particles tightly connected together by adhesive, with through passages, wherein a base member provided with through holes is used, through the through holes in which are passed needles which close off the through holes. The needles project into a housing space or chamber which is defined by the base member. The adsorber particles are then introduced into the housing chamber, with the needles projecting with end portions out of the adsorber particle bed. Then the adsorber particles are consolidated or fixed together by the adhesive to form the filter body, and thereafter the needles are withdrawn from the filter body.
The through holes in the base member are of an internal cross-section which is matched in a close-tolerance relationship to the cross-section of the needles. The said cross-sections can be of a round or polygonal configuration. Round cross-sections have the advantage of being simpler and less expensive to produce. The needles may also be of a configuration involving a variable cross-section along their longitudinal extent. It has been found advantageous for the needles to be coated on their surface for example with TEFLON or the like in order to avoid or at least reduce adhesion of adsorber particles or adhesive, in such a way that removal of the needles can be effected without problem.
A peripherally extending side wall can be arranged on the base member and projects upwardly from the base member to establish the housing chamber, that is to say the adsorber particle bed. That peripherally extending side wall can be integrally connected to the base member, but it is also possible for the peripherally extending side wall to form a member which is separate from the base member. In the first-mentioned case the base member and the peripherally extending side wall can form a container which is repeatedly employed for implementing the method according to the invention

REFERENCES:
patent: 4061807 (1977-12-01), Shaler
patent: 4665050 (1987-05-01), Degen
patent: 5256360 (1993-10-01), Li
patent: 5510063 (1996-04-01), Gadkaree
patent: 5593626 (1997-01-01), Yagashita
patent: 5665148 (1997-09-01), Muhlfeld
patent: 5820967 (1998-11-01), Gadkaree

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