Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H5/00—Special paper or cardboard not otherwise provided for
  • D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
  • D21H5/14—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of cellulose fibres only
  • D21H5/16—Tobacco or cigarette paper
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/03—Non-macromolecular organic compounds
  • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
  • D21H17/14—Carboxylic acids; Derivatives thereof

Definitions

• Tobacco smoke filters especially for filter-tip cigarettes, which do not impart a so-called paper taste to tobacco smoke passing therethrough in which the paper is substantially free of sulphurous compounds and ismade from a pulp into which is added a sulphur-free metallic compound of an acid from the group comprising acetic acid, propionic acid and formic acid in an amount to achieve a pH value less than 6.0 in the water container of the last screen of the paper-making machine.
• the compound preferably is aluminum acetate.
• the present invention relates to improvements in tobacco smoke filters made of paper, particularly for filtertip cigarettes, in paper for such filters and in methods for producing such filters. More particularly, this invention relates to improving the taste qualities of such filters.
• Filters containing paper are known and widely used for filter-tip cigarettes.
• One method, which is now practiced, for treating paper to make it into an efficient filtering material, i.e., filter paper for filter-tip cigarettes, includes passing a web of smooth raw paper between at least one pair of intermeshing grooving or corrugating rolls provided with axially spaced circumferential ribs. The rolls form in the paper a corresponding number of parallel grooves, i.e. corrugate the paper. During treatment by the rolls, the engagement of the ribs with the paper prevents any substantial transverse shrinking or gathering thereof so that, as a result, the paper web is stretched laterally.
• Such stretching loosens the fibers of the paper to form fuzzy areas with numerous projecting fiber ends on the surfaces of the grooved web at locations where the fibers are at least partially separated or pulled apart.
• the stretching may be to such an extent as to cause haphazardly-located, discontinuous longitudinal tears which have frayed fuzzy edges, although the web for all practical purposes substantially retains its transverse continuity.
• This known treatment method includes before, during or after the drying treatment, further deformation or mechanical working of the corrugated and stretched web by any appropriate device, for example, by pinch rolls having smooth or knurled surfaces which partially compress or flatten the corrugations and so minimize the existence of unobstructed through passages in filters made of such paper or greatly restrict such passages.
• the thus produced filter paper may be wound on spools or bobbins to be fed later to filter rod machines of well known design, or may be fed directly into a filter rod machine.
• it also is advantageous to heat the grooving and stretching rolls to a temperature up to several hundred F. though cold rolls are by no means insufficient.
• rolls provided with prongs of determined shape are sufficient for producing slot-like openings of desired shapes in a paper web treated with such rolls so that adhering struck out parts of the paper have frayed edges with a multitude of projecting fiber ends, as disclosed in US. Patent 2,847,286.
• Another object of this invention is to provide a tobacco smoke filter, which is made by subdividing an endless filter rope or cord containing paper in a wrapper and having an approximative round sectional shape, and wherein the paper is free from sulphurous compounds and contains a metallic compound of an acid from the group comprehending acetic acid, propionic acid and formic acid.
• Known tobacco smoke paper filters are normally made from raw paper, preferably of a weight of from about 20 to about 40 grams per square meter.
• aluminum sulfate is incorporated into the paper pulp in order to increase the tensile strength of the dried paper.
• Aluminum sulfate has the property of somewhat increasing the coherence or adhesion of the fibers constituting the paper web.
• the raw paper web should be produced from a pulp substantially free from sulphuric compounds and containing no aluminum sulfate.
• other suitable compounds have to be substituted, for aluminum sulfate in the pulp, which possess the same desired property as aluminum sulfate in this regard but which have no sulphurous components.
• aluminum acetate for example, is such a suitable compound when substituted in an amount such that the pH-value of the water in the container of the last screen of the paper-making machine is reduced to a value less than 6.0 or preferably less than 5.8.
• the aluminum acetate comprises from about 1% to about 2% by weight of the pulp.
• Such a paper Web substantially free of sulphurouscompounds and having a higher acid content than normally, can be corrugated or lacerated by a fiber-loosening treatment in dry or moistened conditionto any desired extent and wound up on spools or bobbins which are made up into filter plugs later on, or may be fed directly into a filter rod machine for wrapping and forming in an endless filter rope which is subdivided into filter rods and/ or plugs of desired lengths.
• the corrugated and/or lacerated paper webs produced continuously by the above described method can be easily made up into filters which possess mechanical qualities, for example tensile strength and dimensional stability, at least equivalent to the corresponding qualities of filters made of hitherto used paper webs.
• the raw paper embodying this invention has been found to possess mechanical qualities at least equivalent, and possibly better, than corresponding qualities of hitherto used raw paper.
• the following table compares relevant characteristics of the best quality raw paper used heretofore for making filter paper according to the above-described known process with raw paper embodying this invention.
• raw paper for filters according to this invention has better mechanical qualities than raw paper used heretofore for tobacco smoke filters.
• Filter-tip cigarettes have been prepared equipped with filters from longitudinally grooved, mutilated and lacerated paper Webs produced from paper according to this invention and having values according to the above table for socalled blind smoking tests by experts. These tests demonstrated that the paper taste hitherto common to cigarettes having paper filters is noticeable only to a negligible extent or not at all with filters embodying this invention. Further tests have shown that this phenomenon probably results from the fact, that in the paper and its cellulose fibers the aluminum sulfate is replaced by aluminum acetate and at the same time the grooved and/ or lacerated paper web is provided with a higher acid content. Without doubt the described filters provide a' noticeable improvement in taste qualities compared to all other known paper filters for cigarettes.
• Al (OH) (CH COO) Al (OH)
• a paper web was continuously wound off with a speed of about 60 to 100 cm. per second, moistened, passed through the nip between a pair of heated rotating steel rolls provided with interfitting axially-spaced circumferential ribs to stretch the paper laterally and then dried by passing a heated dryer.
• the treated paper web was provided with narrow longitudinal ridges, intermediate longitudinal grooves, i.e., a corrugated structure, and a multitude of irregularly distributed disconnected longitudinal tears.
• the web was fed into a filter rod machine of known design, gathered laterally to an endless rope of about 8.3 mm. diameter, wrapped, and subdivided into filter rods of desired length.
• the filters produced according to Example I were attached to cigarettes and checked in respect to the nicotine and tars absorption as well as to the taste quality and compared to filters having the same draw resistance made from aluminum sulfate containing raw paper of the same weight treated in the same manner.
• the filtering effect of the acetate-containing paper filter is at least of the same value and according to many test results even higher than the sulfate-containing paper filter.
• the taste improvement of this acetate containing paper filter compared to sulfate containing paper filter has been proved beyond any doubt by so-called blind smoking tests of experts.
• Example 11 The pulp in the beater was prepared as in Example I and aluminum acetate AI (OH) (CH COO) added up to a pHvalue in the water of the container of the last screen of about 5.8 to 5.6. Then diluted acetic acid CH COOH was admixed with the pulp up to a pH-value of the water from the last screen of about 5.4. The production of paper webs and filters was then carried out as described in Example I.
• OH aluminum acetate AI
• CH COOH acetic acid
• Filter plugs of 20 mm. length prepared according to Example 11 were attached to a tobacco column of 65 mm. length and tested and compared to filter plugs of the same length and identical draw resistance made from cellulose acetate fibers (Typ ESTRON 3.340) connected to identical tobacco colums.
• the filter plugs containing cellulose-acetate fibers were prepared in a known manner together with Driacetin as a softening agent whilst the filter plugs according to Example II were used without any additional preparation.
• the filtering efiiciency of the two filter plu-g types was checked and the following values of components in the smoke stream of one cigarette were found:
• paper webs and filter plugs produced according to Examples I and II are completely odorless and insipid. No trace of an odor exists in closed rooms used for long time storing of raw paper, treated paper webs and filter rods produced according to this invention in contrast to the objectionable odor accompanying filter rods which are made from raw paper impregnated subsequent its production with acid liquids as described above. Also the grooving and lacerating treatment of raw paper produced as described in Examples I and II, by passing between heated metal rolls subsequent to a tmoistening step and followed by a drying step, can be carried out without any odor indicating the presence of acetic compounds or acetic acid added into a pulp. Moreover no corrosion of metallic parts exists whilst raw paper embodying this invention is in contact therewith while' being treated in suitable devices.
• a quantitative chemical analysis to ascertain the critical substances in the raw paper or filter rods is rather difficult but suitable methods for a qualitative examination are available.
• an examination using chloride of barium is preferred which shows in known manner a deposit of barytes (barium sulfate) if sulfate compounds are contained in the paper.
• the qualitative detection of acetic compounds in paper filters is more difficult but possible using the known Kadodyl check or the potassium bisulphate check.
• the first mentioned check is performed by a reaction of arsenic trioxyd and the presence of acetates is indicated by an odor of garlic.
• the second mentioned check results in a typical acetic acid odor.
• a tobacco smoke filter especially for filter tip cigarettes, generally in the shape of a cylindrical plug longitudinally permeable to gases and a consisting essentially of paper, characterized in that the paper is substantially free of sulphurous compounds and contains aluminum acetate as a substitute for aluminum sulfate sizing agent.
• a tobacco smoke filter according to claim 1 characterized in that the paper contains the aluminum acetate in a small percentage of the paper weight not exceeding about 2% by weight.
• a tobacco smoke filter according to claim 1 characterized in that the pH-value of the paper is less than 6.0.
• a tobacco smoke filter according to claim 1 characterized in that the pH-value of the paper is less than 5.8.
• a tobacco smoke filter according to claim 1 characterized in that the pH-value of the paper is in the range of from about 5.6 to about 5.3.
• a tobacco smoke filter according to claim 1 characterized in that the paper has a weight of from about 20 to about 40 grams per square meter.
• a tobacco smoke filter according to claim 1 characterized in that the fibers of the paper are loosened and at least partly pulled apart and the paper is covered by projecting fiber ends.
• a tobacco filter plug according to claim 1 characterized in that the paper comprises a transversely gathered sheet having a corrugated structure in transverse section.
• Tobacco smoke filter fibrous sheet material consisting essentially of porous, smoke permeable paper substantially free of sulphurous compounds and containing aluminum acetate as a substitute for aluminum sulfate sizing agent.
• Fibrous sheet material according to claim 9 characterized in that the paper contains the aluminum acetate in a small percentage not exceeding about 2% by weight of the pulp from which the paper was made.
• Fibrous sheet material according to claim 9 characterized in that the pH-value of the paper is less than 6.0, as measured by the water in the container for the last screen of the machine on which the paper was made.
• Fibrous sheet material according to claim 9 characterized in that the pH-value of the paper is less than 5.8, as measured by the water in the container for the last screen of the machine on which the paper was made.
• Fibrous sheet material according to claim 9 characterized in that the pH-value of the paper is in the range of from about 5.6 to 5.3, as measured by the water in the container for the last screen of'the machine on which the paper was made.
• Fibrous sheet material according to claim 9 characterized in that the paper has a weight of from about 20 to about 40 grams per square meter.

Landscapes

• Cigarettes, Filters, And Manufacturing Of Filters (AREA)
• Paper (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Fodder In General (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=4237983

Family Applications (1)

Country Status (18)

Cited By (1)

Citations (8)

• 1966
  • 1966-02-23 CH CH262666A patent/CH454714A/de unknown
• 1967
  • 1967-02-17 AT AT158267A patent/AT265940B/de active
  • 1967-02-17 GB GB7748/67A patent/GB1125366A/en not_active Expired
  • 1967-02-17 DE DE19671692899 patent/DE1692899A1/de active Pending
  • 1967-02-20 SE SE02297/67A patent/SE333702B/xx unknown
  • 1967-02-20 US US617084A patent/US3400723A/en not_active Expired - Lifetime
  • 1967-02-20 YU YU0313/67A patent/YU32485B/xx unknown
  • 1967-02-20 IL IL27459A patent/IL27459A/en unknown
  • 1967-02-20 FI FI670494A patent/FI46796C/fi active
  • 1967-02-21 GR GR670133498A patent/GR33498B/el unknown
  • 1967-02-22 CS CS671293A patent/CS190304B2/cs unknown
  • 1967-02-22 BE BE694447D patent/BE694447A/xx unknown
  • 1967-02-22 FR FR96058A patent/FR1516311A/fr not_active Expired
  • 1967-02-22 NO NO166962A patent/NO116794B/no unknown
  • 1967-02-22 ES ES337161A patent/ES337161A1/es not_active Expired
  • 1967-02-22 DK DK96467AA patent/DK124348B/da unknown
  • 1967-02-23 OA OA52772A patent/OA02334A/xx unknown
  • 1967-02-23 NL NL6702817A patent/NL6702817A/xx unknown

Patent Citations (8)

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