NO741922L - - Google Patents

Description

"Method of making a filter material for cigarette end filters".

The present invention relates to a method for the production of a filter material which is used alone or in combination in cigarette end filters in which method electrostatic attraction forces are used, which in and of themselves are known for other applications.

There are known cigarette filters, called "multi-filters", where

at least one of the components contains powdered or granular activated carbon and/or other adsorbent products.

More specifically, the following will deal with end filters known as dual carbonized ("DUAL charbonnés"), i.e. consisting of a short section of cellulose acetate at the end near the mouth of the smoker and a section of paper of ey lindr lak for» formed by 1®$ belagt®ed palves or granules of carboa vad «aden near the tobacco island.

Fragile freægangaæåts «r known before g>åf#ri»fav 6*t powdered «lia? granulated aktlvcoal on ©a fiferøø feltjrørcaée åote©red anveadea £©r tumoXc© 'of paper sack the janen in'©t such double&elt vessel» teoniised felttar.

®ssei#®ivi© is dat known to {3ia$>eff£iare e&ttvisall in f in-jjrøXveritserfe fora 'to ém aqueous euepenejon of output aateriele? before the paper web is émmts in the psj?irDaafcinen, Aktivkuilet 'aeso'åa egiller©ame 'rolla oem conventional inert paper fillers, So j^vafe £«r-Selt in flbcrøaaeca, cos «Saltkar dat a like that it loses ea cj©i <9o£. cv ai$£ active©verflote sos aka! hold back the to&ak kingdom's <gi£fc£c?e. lagers and gases,.

■ ViSare a» it is known to p&fer palvoarioart ssktivSmil $d the layers of fibrtfat £ilfeer?»ateriale at v-duajisf) tinder tyngéekr&<g>tea's effect all®» veÆ ferat^vniag. 'The akfe&ve surface© of^ulverofc will €a benoldea, nän $a raidler to bia3a pslveret tii <§©t fi&føuøse'Urø .not muchaieQ, te the powder a tendess to & fal,!© of ve$ Sm sainote shaking « nder the training of the filter medical safe in the filtenaaa&iaea. .©that is©geå known different fref^Qngaaaåt- MS, iådning of'the'panels -of activeksaXl to the surface of the filtor#akcn vod -kja!L$ ©v fclefeen&dler øco f „efeo. Xatekr and eellttlo«e«3tere. Se£fe£a3tS*3fce» oelXesT oktivkullot©ø Sofereae sla' satisfiest© eg vari®, Ban <2@fe en* turned'kiefeeEai€$©3> 'tørølwttck an considerable <åél .av gratsaoverglanes, k^eæveé diae ©. fsøpstsf aérø^ejoneoktivitet-: $v«s?f©r' the rake's toxic •gases eXXer (åaæ^r, ©^ÆiasaeXoen elit&inerer disoe .itøatis&joXXig © raloo^a?@gfan^år a frcsEs^aia^Binåt for the production of red<w?ialeir wrong feruk in siga-æ$tfafiltre» olene©Iler combination rrteå cnfee ad»©rberea<S©' «fflterialear,@$ Sseisganf srøåtasi^s 1 vessel aft iaert vad at tåa© p& el©ktif© at©t&Qis way pa in which ffliaat© one of the eides of a band of saetsrial is attached? a layer of the activity!!, whereby a filterenterial is obtained mé stos a^aasEj&ojens*

weB jfisressøsa^«æ&tan according to©ppfinaaisoa is used- efe segnt _ gint pxlvcsif k^G.k®rast^rrela© is always wn^esr ©, t oøLtfevilke^. golvar $å£Øreo on. the rim ■ mv ®at««ial« at chain island of :®t ••øl<sktr^8tatiak arraa-geoent a©a is v@l kjant for other anveadelaar*Bån^st of material, mm cam v3®e ot fl @ratof£ of eelluloaeaoetafe* kmnstsilke, «vntetiake, ktmDtife ©11©^ natural non-woven fibers, ssen also a paj?iréck o&-

such as cellulose wadding, crepe paper, corrugated paper or other similar material used in the manufacture of eyelet filters,

can be coated with carbon in amounts of l-30g per m and evenly distributed over the entire surface.

The electrostatic application of the carbon was chosen because it avoids the use of adhesives to bind the grains to the substrate. The absence of adhesive is very, very important, because this usually will enclose a significant part of the activated carbon surface,

so that part of the adsorption capacity is lost.

It can further be ascertained that the binding of dot adsorbing powder used according to the invention lasts in any case beyond the time required for the transformation of the aforementioned layers into a cylindrical filter body.

After the formation of the filter leg, the carbon powder will be enclosed in the interior of the filter, which allows convenient use of the filter leg in connection with the specialized machines developed for the manufacture of cigarettes.

Another important advantage of the invention consists in the fineness of .dot actiorto carbon powder which can be used and which enables • exceptionally good opportunity for contact between the carbon and the gases and vapors of the smoke. Moreover, this fineness makes it dot.possible to bond © the activated carbon powder to the fibers or threads of the substrate material. Finally, the material asm deposited by the method according to the invention > will be: very homogeneous over the entire surface of the treated paper.

It will be understood that the invention is not limited to

the embodiment described above, as variants will be obvious to the person skilled in the art within the framework of the invention.

Claims (3)

1. Process for the production of a filter material for use in cigarette filters, either alone or in combination with other adsorbing materials, characterized in that a coating of active charcoal, whereby a filter material with high adsorption capacity is obtained. 2. Strips of material for cigarette filters or other tobacco products, characterized by the fact that, at least on one side, it has a coating of finely divided activated carbon or other adsorbing materials, the weight of which is m per l-30g. 3. Cigarette filters produced from the band of the material according to claim 2, optionally combined with other materials, which can be adsorbing or non-adsorbing.