DE1692899A1 - PAPER FILTER PLUGS FOR TOBACCO PRODUCTS AND METHODS FOR IMPROVING TASTEFUL PROPERTIES - Google Patents

Description

Müne.an 22, Sk.i. ^ oristr. 2t-22 1692899

Corner. Zw.ibrud.eniU .. Ul. MM62 \ Ό Ό £. Ό Ό Ό

CELFIL COMPANY ESTABLISHMENT V a d U

(Liechtenstein)

Paper capsules for tobacco products and processes for improving their high-quality properties.

The present invention relates to improvements in paper filter caps for tobacco products and to a method for improving the tasteful properties of such filters. Filters containing paper in a wrap are already known and are widely used as cigarette filters. In a practically applied in large Masstabe method for the treatment of paper for the manufacture of cigarette filters is an endless, smooth paper web pass through at least "is angeord- with a close to one another

4098U / 0S34

- ⁷ - '692899

notes with circumferential ribs held in place against lateral movements, provided with a large number of parallel longitudinal grooves and stretched in the transverse direction until many individual longitudinal cracks formed. This rocking causes the fibers in the paper to be loosened, as a result of which areas covered with a fluff and countless protruding fiber ends are created on the two flat sides of the paper web. The transverse stretching can be reinforced with shredded RSndern to 2um occurrence randomly dispersed unzusammenh & HANGING Längeris & e, without the cross-connection, the paper web is unzulrssiq impaired.

This method, which is successful in practice, is used to treat smooth paper webs in order to make them suitable for cigarette filters to make is known, as well as the longitudinally grooved ones produced with it and rerfiberten paper webs and from this by gathering them together Endless filter strand created transversely to the longitudinal direction of the web and envelope, divided into filters of the desired length will. The process and its products are for example described in the patents:

^ Rider Pntont. Ur. 1.130.74 ^

"" "1,125,754

"" "1.067.95a

"" ^w 1,145,076

"" ⁿ 1,145,077

Must reach down to the desired Langerillung and defibration of the paper web between the rollers provided with circumferential grooves in the desired Ausmas in this successful process, yet the cross-connection of the paper web

409814/0534

not to be completely destroyed, the pap '• r fed to the roller pair must first be made flexible, which in practice mainly by moistening with water - which can also contain additives - takes place. The paper web must accordingly are dried after longitudinal creasing and defibering, with another before, during or after drying Change of the paper web, for example a knurling or compression by rotating pairs of rollers with knurled or smooth surfaces can be made. The dried, longitudinally grooved and frayed endless paper web is then either rolled up into bobbins, in the process to the desired width brought and then fed to the filter plug machine for the production of v ~> n filter stoppers or filter stoppers; rolling up the endless paper web to bobbins can also be avoided and the sufficiently dried, longitudinally grooved and frayed paper web can be used directly to feed the known rod machines for the production of filter rods or filter stoppers. In practice, it has proven to be useful to use the longitudinal creasing and defibration of the moistened paper web perform heated roller pairs, with temperatures at the Surfaces of the rollers provided with circumferential ribs of a few hundred ⁰ C are used; there is the possibility of working with cold rollers.

one hundred ⁰ C can be used; but there is also that

In the production of longitudinally grooved and rerfaterten paper webs according to the known method described above

409814/0534

the moistening of the base paper before entering the scoring roller pairs is not an absolutely necessary process step. Because base papers of a suitable type even without one such humidification in pairs of rollers provided with circumferential ribs is provided with incoherent longitudinal cracks and is frayed can be; In this case, however, the paper web produced has only few or no longitudinal grooves Mistake. If the quality of the filter tab to be produced is less stringent, however, this method can also be used commercially and has the advantage that there is no need to dry the fiberized paper web.

It should also be pointed out that paper webs that are sufficiently shredded can be produced by means other than the above-mentioned pairs of rollers with circumferential grooves. For example is a defibration by perforation according to the patent 316.721 possible, especially if this is done by rolling with long or appropriately shaped spikes crack-like openings with frayed edges are made in the paper web. It has also already been proposed to dry paper webs by means of intermeshing rows of toothed disks and through Pressure from a roller provided with circumferential grooves against a flexible rubber roller to be disintegrated.

The official, made of shredded paper webs on the top described or manufactured in any other way

4098U / 0534

/ ΊΟ

Filter plugs for cigarettes, however, have the disadvantage that when they are used for cigarettes with light, especially With light tobacco varieties, a taste in the smoke can be determined, which is referred to as "paper taste" and in the cigarette industry is generally started. It is true that it is hardly a question of flavoring substances that are emitted from the paper filter into the smoke stream, but rather a consequence of the different ones Absorption of certain smoke components compared to fiber filters, but the nature of the effect of paper filters on some cigarettes, known as "paper taste", is and will be a fact sometimes viewed in the cigarette industry as a disadvantage of all paper filters.

Since the cause of the "paper taste" that occurs is not exactly known, it was initially assumed that the dampening and subsequent drying of the paper web, as well as their contact with hot metal surfaces, possibly causing this taste. Experiments with paper filters made of paper webs, which are sufficiently strong in the dry state by suitable non-metallic means were shredded to act as a smoke filter, but have shown that the "paper taste" also occurs.

On the other hand, a lot of research has been done to help with the manufacture of cigarette filters from paper webs to reduce the observed "paper taste" by either

4098U / 0S34

-β- Ϊ692899

the dry paper web was acidified during moistening or by subsequent spraying, for example with acetic acid, formic acid, aqueous alum solution and the like. It was found that such acidified, fiberized paper webs are processed into cigarette filter stoppers could be that showed a lower "paper scrap", but such acidification always led either to err. unwanted caruch of the filter rods produced or it arose during the creasing and defibering process considerable difficulties due to corrosion on the metallic components used for this purpose. The processing of v-> n F.jhpapieren with a lower than the usual pH value of 6.1 up to 6.3 gave unsatisfactory results, since such papers sometimes showed an undesirably yellowish coloration or a too had poor flexibility and a straw-like character, which was highly detrimental to defibration and resulted in unsatisfactory paper webs without bringing about any noticeable improvement in the "paper taste".

The present invention relates to a method for improving the taste properties of tobacco product filters, that are made of paper in a wrapper because of that is marked that a paper web made of sulfur-free Pulp "and added to the pulp a sulfur-free metal compound of an acid of the group to which acetic acid, propionic acid and formic acid also belong, in such an amount until In the water of the last wire of the paper machine

4098U / 0G34

pH is less than 6.0, whereupon the paper web in controllably shredded, wrapped, formed into an endless strand of paper with an approximately round cross-section and is divided into filter sections of the desired length.

The filter stoppers according to the invention for tobacco products, in particular for cigarettes, produced by dividing an endless strand of approximately round cross-section of paper in an envelope is characterized in that the paper is free from sulfur-containing compounds and is a metal compound contains an acid of the group to which acetic acid, propionic acid and formic acid also belong.

The invention is described below in some exemplary embodiments explained in more detail.

The known paper filter stoppers are normally made from raw paper webs with a weight of about 2 " to 40 gr per square meter. Some aluminum sulphate is usually added to the pulp for these papers in order to increase the strength of the paper webs. This aluminum sulphate has the effect of strengthening the cohesion of the fibers making up the paper , which is desirable , light tobacco blends the smoke the undesirable so-called "paper taste",

40Ö814 / 0 & 34

It has been established and through a number of examinations proven thatr. the "paper button" of paper stoppers can be reduced or made to disappear completely, when such filters are made by the present process.

For this purpose, a paper web nos a pulp is produced as free of sulfur-containing compounds as possible, i.e. the addition of aluminum sulfate is completely dispensed with. However, in order to achieve the absolutely necessary gluing and sufficient cohesion of the fibers in the paper web, other sulfur-free compounds must be added, which have a similar effect to the previously insignificant aluminum sulfate. It has been found that for this purpose, for example, aluminum acetate Al_ (OH). (CH COO) is suitable, which is added in such an amount that a pH value less than β, C or preferably less than 5.8 occurs in the water tank of the last wire of the paper machine. Such a paper, which is practically free of sulfur-containing compounds and has a higher acid content than usual, is then shredded with or without additional moistening in a controllable manner and either wound into bobbins and processed further or cut to the desired width immediately after the shredding process , wrapped in a strand machine, formed into an endless filter strand and divided into sections of the desired length.

40Ö8U / 0S34

1592999

It has been found that, according to the new process, a fiberized paper web can be produced by means of the continuous process described, which is difficult to process into filter plugs and its mechanical properties, such as tensile strength and dimensional stability. hitherto customary paper webs at least the same size. Also the Characteristics of the paper produced in this way are at least equal to or better than those of the previously customary Rchpapierbahnen. The table below shows the best comparative values Base papers, as they have been used up to now for filter plugs v.nd of a backing paper produced according to the present process.

Prior to comparison of the raw paper previously used for filter plugs with the. jeniarn according to the legends procedure.

Example I. Example II previous
Base papers Base paper after
the present
procedure White content in% 89.5 88.4 Weight per unit area gr / r *. 35.0 35.0 Thickness in me 0.060 C. 060 ReisslSlSnge in m: \ Sngs 3% OO 5000 qu-jr 146C 2593 across / lengthways in% 41.7 51.9 pH value in white water 6.3 5.8

From the numerical values shown, it can be seen that the raw paper according to the present method is more favorable in practically all of its properties than raw paper

U / Ub34

! «392899

of the type previously used for cigarette filters. From lSr.gsgerillten and frayed endless paper webs present procedures and in accordance with the above-.den Table were Filtorstfibe and from it in bek? intor '.-.' rise filter plug manufactured for cigarettes and in extensive smoking tests checked. It has been shown that <? In "ppper taste "as he has found so far with paper filters will, only to a negligible extent or not at all there is more. In further experiments it was found that this phenomenon is not only due to the higher acidity of the longitudinally grooved and frayed paper webs, but from the fact that in the cellulose fiber Filter plug not aluminum sulfate, but an acetate compound is available. In any case, there is a noticeable improvement in taste compared to all of them by means of the present filter plugs other known paper filters achievable.

Further investigations have shown that in one Reduction of the pH value below 5.8 down to about 5.4, any residues of the "paper taste" that can still be detected disappear and in any case a further improvement in taste can be determined. With a further increase in the acidity in the paper up to pH = 5.2 to 5.0 no taste disadvantages were found: the most expedient The pH range is 5.6 to 5.3.

With putters made from a base paper in which the usual aluminum

sulfate had been completely replaced by aluminum acetate, Extensive experiments were conducted. The filters were after the procedure according to Examples III and IV below manufactured.

Example III: That prepared in the usual known manner

Pulp was used in the Dutch, omitting the '' Then add a small amount of aluminum sulphate

Amounts of Αΐυ-iniumacetnt Al- (CH) - (CH-COO) in added in liquid form and the pH value in the water of the last wire of the paper machine supervised. The addition of Al- (OH) (CH-COO) was so long; continued until the pH by adding this substance no more further decreases, which point is reached in the range from pH = 5.8 to 5.6. From the pulp A base paper weighing about 32 to 34 grams per square meter with a cloudy structure was produced and wound up into a roll.

From the raw paper roll was then at a speed of 60 to 100 cm per lake. peeled off a base paper web, moistened, through the gap between heated with interlocking. Rotating steel rollers with ribbed edges are moved through and then to dry

U / Ob3A

.η.

passed continuously through a heating device. The so generated, with lingual ribs, Longitudinal gutters and a large number of irregular distributed, unrelated longitudinal cracks provided paper web would be fed to a filter rod machine of known design, in the transverse direction into an endless strand of about 8.3 now Gathered together, wrapped in paper and finally divided into filter rods of the desired length.

The filter plugs created according to Example III were tested for their nicotine and tar removal and for theirs Taste compared with filters that are out of the ordinary. Base paper containing aluminum sulfate and of the same weight per unit area and had been produced with the same moistening and further processing and had the same tensile resistance. The separation effect was at least as great in many measurements even a bit larger for filters made from the acetate-containing base paper. The improvement in taste of the acetate-containing filters compared to the eulphate-containing filters was demonstrated in blind smoke tests unequivocally established.

Example XVt The pulp was initially prepared as in Example XXX

as much aluminum _{acetate Al 2} (OH) ₂ (CH ₃ COO) was added. until the water in the last wire of the paper machine

shows about the value pH - 5.8 to 5.6. then

acetic acid CH-COOH was added until

until there is a pH value in the water of the last sieve

of 5.4. The further processing to raw paper

and to filter stoppers as in Example III.

With filters of 20 mm length, produced according to Example IV and investigations were attached to a tobacco column of 65 ir.a. compared to filters of the same length with the same tensile resistance made of cellulose acetate fibers (type 3.3-40) placed on the same tobacco columns. While the filters according to Example IV without Any further preparation used were the cellulose acetate fibers in a known manner with triacetin as a plasticizer processed into filters. The filtering effect was determined in smoke tests and the following proportions in the smoke determined per cigarette:

milligram

Milligrams of solid-nicotine parts

Filtered Cigarette Example IV 0.8 16 Cigarette with cellulose acetate filter 1,2 21

Despite the considerably stronger filtering effect of the filter according to Example IV in comparison to cellulose acetate fiber filters no "paper taste" in the case of comparative smoking experiments cigarettes fitted with paper filters were found.

Ee «^ ^: thereupon Mnnewsp. That the ctenas Example III and IV

produced paper webs and filters are completely tasteless and odorless. Even after prolonged storage such Base paper or the filter rods in closed rooms no trace of an odor can be detected, in contrast to the already known above-mentioned subsequent treatment of finished base paper webs with acids or acidic ones Substances. Also with the defibering and creasing or after paper webs produced in the present process after moistening by means of hot rollers and subsequent drying no odor detectable, which is a conclusion about the acetate compounds added to the pulp, i.e. aluminum acetate or acetic acid allows »there is also no trace of corrosion of metallic components when processing paper webs produced according to the present process.

The chemical-analytical determination is also corresponding critical admixtures are not easy, but suitable tests can be carried out on both raw paper webs and filter rods to determine the characteristic admixtures will. For the detection of usually present, but vegetables Sulfur-containing compounds in the paper to be avoided in the present process can be tested in a known manner Barium chloride take place, which, if a sulfate content is present, results in a precipitate of barium sulfate. The proof of compounds containing cotate is more difficult, but it can at least qualitatively above the i'adodyl or

4098U / 053 *

ΊΟ

1S92899

- 15 -

the potassium bisulfate samples are taken. In the first-mentioned test procedure, there is a reaction with arsenic trioxide and, in the presence of acetates, a garlic-hard odor occurs. In the second sample, on the other hand, a typical vinegar whore odor can be detected.

Thus, the absence of sulfates and the presence of acetates in the paper web and in the finished filter can be ascertained, and both are physical characteristics of the products rr.with sufficient distinctive character.

The above-mentioned examples of the present process and the paper products produced herewith relate to dor. He ·. with aluminum sulfate usually present in paper webs by aluminum acetate with or without the addition of acetic acid. The process and its products are not limited to this, however , and filter cigarettes with filters made from paper beans, "those in which aluminum sulfate has been replaced by other compounds of aluminum with sulfur-free monovalent inorganic carboxylic acids, such as meisenwilure HCOOH or propionic acid CH COOH , have taste" improvements and at least one partial elimination of the "paper taste" gezeig. also, a replacement of aluminum sulfate by CaIciumacetat and magnesium acetate or other calcium or magnesium compounds dsr sulfur-free monovalent inorganic carboxylic acids Verl countries the taste of paper filter cigarettes in a favorable sense, influence aller- ding · also the mechanical and other properties of the paper webs.

40981 A / OS34

Claims (1)

Claims 1.) Filter plugs for tobacco products, especially for cigarettes, manufactured by subdividing an endless strand of approximately round cross-section of paper in an envelope, thereby characterized in that the paper is largely free of sulfur-containing compounds and is a metal compound of an acid that group of acetic acid, propionic acid and formic acid include. 2.) Filter plug according to claim 1, characterized in that dan Paper is largely free of sulfates. 3 ·) Filter plug according to claim 1, characterized in that there? Paper contains a metal acetate. 4.) Filter plug according to claim 1, characterized in that the Paper contains aluminum acetate. 5.) Filter plug according to claim 1, characterized in that said compound is present in a small percentage of the weight of the paper, which does not exceed 2 wt. #. 6.) Pilteretöpeel according to claim 1, characterized in that the pH of the paper is less than 6.0 let. 7.) Filteretöpeel according Anepruch 1, characterized in that Dao the pH of the paper is less than 5.0 let. 4U9BU / 0534 0.) Pllterstöpsel according to claim 1, characterized in that the pH of the paper is in the range from 5.6 to 5.3. 9.) Pilter plug according to claim 1, characterized in that the paper weighs 20 to 40 grams per square meter owns. 10.) Pilter plug according to claim 1, characterized in that the paper bit of a multitude of incoherent elongated Provided openings, frayed and covered by protruding fiber ends. 11.) Pilter plug according to claim 1 and dependent claims 9 and IC, characterized in that the paper includes a plurality is provided by longitudinal ribs and longitudinal grooves in between. 12.) A method for improving the taste properties of tobacco / arenic filters, which consist of paper in a wrapping, characterized in that a paper web is made from pulp largely free of beef and the pulp is a sulfur-free metal compound of an acid from the group of acetic acid, propionic acid and Ar RUN .EI sens whore belong, is added in such an amount to the water of the last screen of the paper machine the pH whereupon fiberized less than 6.0 1st "in the paper web reßuli erbarer tfeise, wrapped approximately in an endless papers of Trang 4098U / 0S3 The cross-section is reshaped and into filter sections of the desired Length divided rird. 13.) The method according to claim 12, characterized in that a Pulp largely free. Aluminum sulfate is used. 14.) A method according to claim 12, characterized in that drr pulp Aluniniuracetat in liquid form ugef ^ ^r; gt. 15.) The method according to claim 12 and claim 14, characterized in that the addition of Aluniniunacctüt is continued until the water in the last sieve of the Pcpiemanchi r.rs a pK-üert in range. r, 8 bi. 5, G reached. 16.) Method according to claim 12 and Vr.tomr.spruch 15, thereby gek jnnzeiehi et that only further lowering the pH-TTertec dilute acetic acid CH, COOH is added. 17.) Method according to claim 12 and sub-claim 15, characterized in that that the pH-Tert is set to 5 »6 to 5» 3 * will. 18.) The method according to claim 12, characterized in that a Aluniniun connection with sulfur-free monovalent anorgai see carboxylic acids being added. j. 19.) Method naoh claim 12, characterized in that dees "a Compound % * τ & τ group of parts, which also includes calcium and kegnesiuB "", is added with monovalent inorganic carboxylic acids that are free of sulfur. 20.) Procedure according to claim 12 and one of subclaims 13 up to 19, which means that the pnpierbnhn is through at least one pair of rotating balzen with intertwining Unfancsrippcn through / -, υ leads and thereby transversely to the direction of movement am to the appearance of a large number of ur.r.usan-.enhünner.-. the cracks are stretched, thereby disintegrating and becoming docked with protruding fiber ends. 21.) Procedure according to Anrprueh 1? and sub-claim 20, characterized in that dr.cr die Fnpi.erbr.hn before ¹ . Pass through the rollers moistened, middle heated rollers cuergereckt and then fjotrocknot vriri. 22.) The method according to claim 12 and l'interann claim 20, characterized in that the paper web with a large number of impressed openings / tcn r.it abot "hordes of fiberized inventors rer— will see the corresponding eiron any Kueter About The whole breading area is distributed and can be of any size and shape.