CA1092932A - Method for producing cigarette filters and the filters obtained - Google Patents
Method for producing cigarette filters and the filters obtainedInfo
- Publication number
- CA1092932A CA1092932A CA314,446A CA314446A CA1092932A CA 1092932 A CA1092932 A CA 1092932A CA 314446 A CA314446 A CA 314446A CA 1092932 A CA1092932 A CA 1092932A
- Authority
- CA
- Canada
- Prior art keywords
- fibers
- sheet
- artificial
- plasticizer
- fibrous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/02—Manufacture of tobacco smoke filters
- A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
- A24D3/0212—Applying additives to filter materials
- A24D3/022—Applying additives to filter materials with liquid additives, e.g. application of plasticisers
Landscapes
- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
- Laminated Bodies (AREA)
- Filtering Materials (AREA)
- Nonwoven Fabrics (AREA)
Abstract
ABSTRACT
The method produces cigarette or cigar filters from a fibrous sheet comprising a mixture of artificial fibers such as fibers of cellulose acetate and fibers of natural cellulose. Artificial fibers capable of being plasticized are employed, a specific plasticizer of the material constituting said fibers is applied on this layer. This plasticizer creates, after the shaping of the sheet into a cylindrical roll, an interfiber connection network in the artificial fibrous texture of the sheet on which there is superposed a second interfiber connection network between the contacting zones of the sheet shaped into a fil-tering roll.
The method produces cigarette or cigar filters from a fibrous sheet comprising a mixture of artificial fibers such as fibers of cellulose acetate and fibers of natural cellulose. Artificial fibers capable of being plasticized are employed, a specific plasticizer of the material constituting said fibers is applied on this layer. This plasticizer creates, after the shaping of the sheet into a cylindrical roll, an interfiber connection network in the artificial fibrous texture of the sheet on which there is superposed a second interfiber connection network between the contacting zones of the sheet shaped into a fil-tering roll.
Description
0~Z~32 The present invention rela-tes to a method for producing cigarette or cigar filters from a f;brous sheet comprising a mixture of artificial fibers such as cellulose aceta~e and fibers of na~ural cellulose.
Filtering fibrous materials in the form of a sheet are known which are employed after a suitable transformation for producing cigarette filters and comprise a certain proportion of thermofusible fibers For the purpose of lmparting to the cigarette Filters, after a heat treatment of said material, mechanical properties of standing up well to the efFect of smoking while remaining highly suitable for the inhalation of the smoke by the smoker.
Other filtering fibrous materials in the form of a sheet . are known for producing cigarette filters in the form of superposed mult;ple layers, some of which are formed by natural cellulose fibers . 15 such as cellulose wad, and the others are formed by cellulose acetate for the purpose of producing, cheaply, filters having characteristics equivalent to those of the:so-called multiple cigarette filters, that :: is to say filters comprising a plurality of elements of different type assembled in end-to-end relation.
~ 2Q : These two filtering fibrous materials have as respective :~ ~ drawbacks :
the first, the drawback of requiring one or more high temperature heating devices for bringing the whole of the filtering mass to the temperature of fusion of the thermofusible fibers, : ; 25 the second, the drawback o~ essentiallyirequiring the use . of t~o layers of m~terial of very different type, for example a layer of cellulose wad and a layer of cellulose acetate, requiring for each of the two layers elaborate pretreating operations which are awkward and complex to carry out 30 ~ The present invention permits overcoming these drawbacks ' :
-and relates to a method for producing cigarette filters from afiltering fibrous sheet comprising a mixture of artificial fibers and natural cellulose fibers.
According to the present invention there is provided a method for produeing cigarette filters comprising starting with a filtering fibrous sheet which eomprises a mixture of artifieial fibers eapable of being plastieized and natural eellulose fibers, lmpregnating said sheet with a speeific plasticizer of the material eonstituting the artificial fibers, allowing said plasticizer to start its aetion on the artifieial fibers, and thereafter shaping said impregnated sheet into a roll before the end of the placticization so as to ensure that said plasticizer exerts its action in a further way and achieves a double interfiber connection network, namely a first inter-fiber connection network within the artificial fibrous texture of the sheet and a second interfiber connection network which is superimposed on the first network and is produeed between the zones in contact of the sheet when it has been shaped into said filtering roll.
In one embodiment, the proportion of the artificial fibers comprises fibers of cellulose diacetate, the plasticizer used being, in this case,~glycerol triacetate.
The sheet of fibrous material may be obtained by a eonventional paper-making method or also by the well-known technique of non-woven products. It may be employed craped or uncraped. In the first case, the craplng may be carried out on a paper-making machine or outside the machine.
The eellulose acetate fibers in the mixture of the fibrous sheet may come from cuttings of short length, for example `
of 5 to 25 mm, of endless filaments of cellulose acetate which are curled or uncurled eonstituting the "core" or "cable"
commonly employed in the construction of cigarette filters of !
l~Zg3~
acetate.
In a preferred embodiment, the acetate fiber.s in the composition of the sheet represent 25% by dry weight relative to the total fibrous mixture, the remainder consistiny of 75%
of natural cellulose fibers.
This fibrous sheet is in the form of reels and its transformation in accordance with the invention, prior to its shaping into cigarette filters, requires the ~ollowing steps:
unwinding from the reel, , "
':
: -2a-~ . i~
~9Z~3Z
moistening of the sheet with water if necessary, ~epend-ing on the quality of the product to be obtained, imparting a wafer relied configuration in the form of fine longitudinal grooves or 1engthwise craping, possibly drying, application by any of the means known in the fleld of the production of acetate filters~ for example by spraying of a specific plasticizer of the material constituting the artific;al fibers employed in the sheet , in the case of cellulose acetate fibers~ the plastici~er used may be glycerol triacetate and its proportion is necessarily lower than 20 % relative to the total weight of the filter to be obtained.
. The fibrous sheet thus impregnated with plasticizer is shaped, geometrically or in a random manner, into a filtering cylin-drical roll, the plasticization commencing as soon as the plasticizer is deposited on the sheet and continuing well beyond the shaping u~
the sheet, which creates, on one hand, an interfiber connection network in the artificial fibrous texture of the sheet, and~ on the other, an interfiber connection network between the faces, contacting zones or .~ points of the sheet shapeo into a roll.
The present invention results in the following advantages as concerns the cigarette filters obtained: .
good compactness and good elasticity before and during the smoklng operation, owing to the presence of the two interfiber connection networks which, owing to their rigidity and their lack of ~S sensit;vity to the moisture of the tobacco smoke and ~he saliva o~ the smoker, actively participate in the reinforcement o-F the framework of the filter, : : good retention of the tars and the nicotine of the tobacco smoke, owing -to the high proportion of natural cellulose fibers, selective retention of certain toxic products of the . .
: .
:~LO~Z93~ t tobacco smoke, such as the phenols owing to the presence of the plas-ticizer chosen for this purpose, for example the glycerol triacetate, improvement of the organoleptic properties of the to-bacco smoke after its passage through the f;lter, in particular in the case of "flue cured" tobacco owing to the ~resence of cellulose acetaté
in the sheet.
Thus the filter according to the invention combines the : . advantages of a conventional cigarette filter of paper and the advan-tages of a filter of acetate while limiting the respective drawbacks of these two types of filters.
.
.
.
~, . .
Filtering fibrous materials in the form of a sheet are known which are employed after a suitable transformation for producing cigarette filters and comprise a certain proportion of thermofusible fibers For the purpose of lmparting to the cigarette Filters, after a heat treatment of said material, mechanical properties of standing up well to the efFect of smoking while remaining highly suitable for the inhalation of the smoke by the smoker.
Other filtering fibrous materials in the form of a sheet . are known for producing cigarette filters in the form of superposed mult;ple layers, some of which are formed by natural cellulose fibers . 15 such as cellulose wad, and the others are formed by cellulose acetate for the purpose of producing, cheaply, filters having characteristics equivalent to those of the:so-called multiple cigarette filters, that :: is to say filters comprising a plurality of elements of different type assembled in end-to-end relation.
~ 2Q : These two filtering fibrous materials have as respective :~ ~ drawbacks :
the first, the drawback of requiring one or more high temperature heating devices for bringing the whole of the filtering mass to the temperature of fusion of the thermofusible fibers, : ; 25 the second, the drawback o~ essentiallyirequiring the use . of t~o layers of m~terial of very different type, for example a layer of cellulose wad and a layer of cellulose acetate, requiring for each of the two layers elaborate pretreating operations which are awkward and complex to carry out 30 ~ The present invention permits overcoming these drawbacks ' :
-and relates to a method for producing cigarette filters from afiltering fibrous sheet comprising a mixture of artificial fibers and natural cellulose fibers.
According to the present invention there is provided a method for produeing cigarette filters comprising starting with a filtering fibrous sheet which eomprises a mixture of artifieial fibers eapable of being plastieized and natural eellulose fibers, lmpregnating said sheet with a speeific plasticizer of the material eonstituting the artificial fibers, allowing said plasticizer to start its aetion on the artifieial fibers, and thereafter shaping said impregnated sheet into a roll before the end of the placticization so as to ensure that said plasticizer exerts its action in a further way and achieves a double interfiber connection network, namely a first inter-fiber connection network within the artificial fibrous texture of the sheet and a second interfiber connection network which is superimposed on the first network and is produeed between the zones in contact of the sheet when it has been shaped into said filtering roll.
In one embodiment, the proportion of the artificial fibers comprises fibers of cellulose diacetate, the plasticizer used being, in this case,~glycerol triacetate.
The sheet of fibrous material may be obtained by a eonventional paper-making method or also by the well-known technique of non-woven products. It may be employed craped or uncraped. In the first case, the craplng may be carried out on a paper-making machine or outside the machine.
The eellulose acetate fibers in the mixture of the fibrous sheet may come from cuttings of short length, for example `
of 5 to 25 mm, of endless filaments of cellulose acetate which are curled or uncurled eonstituting the "core" or "cable"
commonly employed in the construction of cigarette filters of !
l~Zg3~
acetate.
In a preferred embodiment, the acetate fiber.s in the composition of the sheet represent 25% by dry weight relative to the total fibrous mixture, the remainder consistiny of 75%
of natural cellulose fibers.
This fibrous sheet is in the form of reels and its transformation in accordance with the invention, prior to its shaping into cigarette filters, requires the ~ollowing steps:
unwinding from the reel, , "
':
: -2a-~ . i~
~9Z~3Z
moistening of the sheet with water if necessary, ~epend-ing on the quality of the product to be obtained, imparting a wafer relied configuration in the form of fine longitudinal grooves or 1engthwise craping, possibly drying, application by any of the means known in the fleld of the production of acetate filters~ for example by spraying of a specific plasticizer of the material constituting the artific;al fibers employed in the sheet , in the case of cellulose acetate fibers~ the plastici~er used may be glycerol triacetate and its proportion is necessarily lower than 20 % relative to the total weight of the filter to be obtained.
. The fibrous sheet thus impregnated with plasticizer is shaped, geometrically or in a random manner, into a filtering cylin-drical roll, the plasticization commencing as soon as the plasticizer is deposited on the sheet and continuing well beyond the shaping u~
the sheet, which creates, on one hand, an interfiber connection network in the artificial fibrous texture of the sheet, and~ on the other, an interfiber connection network between the faces, contacting zones or .~ points of the sheet shapeo into a roll.
The present invention results in the following advantages as concerns the cigarette filters obtained: .
good compactness and good elasticity before and during the smoklng operation, owing to the presence of the two interfiber connection networks which, owing to their rigidity and their lack of ~S sensit;vity to the moisture of the tobacco smoke and ~he saliva o~ the smoker, actively participate in the reinforcement o-F the framework of the filter, : : good retention of the tars and the nicotine of the tobacco smoke, owing -to the high proportion of natural cellulose fibers, selective retention of certain toxic products of the . .
: .
:~LO~Z93~ t tobacco smoke, such as the phenols owing to the presence of the plas-ticizer chosen for this purpose, for example the glycerol triacetate, improvement of the organoleptic properties of the to-bacco smoke after its passage through the f;lter, in particular in the case of "flue cured" tobacco owing to the ~resence of cellulose acetaté
in the sheet.
Thus the filter according to the invention combines the : . advantages of a conventional cigarette filter of paper and the advan-tages of a filter of acetate while limiting the respective drawbacks of these two types of filters.
.
.
.
~, . .
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for producing cigarette filters comprising starting with a filtering fibrous sheet which comprises a mixture of artificial fibers capable of being plasticized and natural cellulose fibers, impregnating said sheet with a specific plasticizer of the material constituting the artificial fibers, allowing said plasticizer to start its action on the artificial fibers, and thereafter shaping said impregnated sheet into a roll before the end of the plasticization so as to ensure that said plasticizer exerts its action in a further way and achieves a double interfiber connection network namely a first interfiber connection network within the artificial fibrous texture of the sheet and a second interfiber connection network which is superimposed on the first network and is produced between the zones in contact of the sheet when it has been shaped into said filtering roll.
2. A method as claimed in claim 1, comprising using artificial fibers consisting of fibers of cellulose diacetate.
3. A method as claimed in claim 1, wherein the dimensions of the artificial fibers are in the neighbourhood of the dimensions of the fibers of natural cellulose.
4. A method as claimed in claim 1, wherein the percentage of artificial fibers in the sheet is about 20 to 30%
by dry weight relative to the fibrous mixture, the remainder consisting of 80 to 70% of natural cellulose fibers.
by dry weight relative to the fibrous mixture, the remainder consisting of 80 to 70% of natural cellulose fibers.
5. A method as claimed in claim 2, wherein the plasticizer is glycerol triacetate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7738958A FR2412272A1 (en) | 1977-12-23 | 1977-12-23 | PROCESS FOR THE REALIZATION OF CIGARETTE FILTERS AND FILTERS THUS OBTAINED |
| FR7738958 | 1977-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1092932A true CA1092932A (en) | 1981-01-06 |
Family
ID=9199267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA314,446A Expired CA1092932A (en) | 1977-12-23 | 1978-10-26 | Method for producing cigarette filters and the filters obtained |
Country Status (20)
| Country | Link |
|---|---|
| JP (1) | JPS597312B2 (en) |
| AT (1) | AT366896B (en) |
| BE (1) | BE870184A (en) |
| CA (1) | CA1092932A (en) |
| CH (1) | CH626238A5 (en) |
| DE (1) | DE2841077A1 (en) |
| DK (1) | DK576978A (en) |
| ES (1) | ES473548A1 (en) |
| FI (1) | FI66112C (en) |
| FR (1) | FR2412272A1 (en) |
| GB (1) | GB2012553B (en) |
| GR (1) | GR64988B (en) |
| IT (1) | IT1192751B (en) |
| LU (1) | LU80358A1 (en) |
| NL (1) | NL7809454A (en) |
| NO (1) | NO148139C (en) |
| OA (1) | OA06066A (en) |
| PT (1) | PT68581A (en) |
| SE (1) | SE7810911L (en) |
| ZA (1) | ZA785665B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2119224A (en) * | 1982-04-26 | 1983-11-16 | Christopher Ralph Bale | Wrapped cigarette filter |
| CA2213449A1 (en) * | 1995-03-06 | 1996-09-12 | Weyerhaeuser Company | Fibrous web having improved strength and method of making the same |
| GB2474694B (en) * | 2009-10-23 | 2011-11-02 | Innovia Films Ltd | Biodegradable composites |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE536168A (en) * | 1952-12-05 | |||
| GB1014223A (en) * | 1961-07-03 | 1965-12-22 | Kurashiki Rayon Kk | Tobacco smoke filters and method of making the same |
| US3227164A (en) * | 1963-07-23 | 1966-01-04 | Eastman Kodak Co | Tobacco smoke filter |
| DE2127293C3 (en) * | 1971-06-02 | 1980-07-31 | Hauni-Werke Koerber & Co Kg, 2050 Hamburg | Device for applying a plasticizer to a continuous strip of spread filter rope for the manufacture of filters for rod-shaped articles in the tobacco processing industry |
| JPS5115120B2 (en) * | 1972-08-17 | 1976-05-14 | ||
| CH583529A5 (en) * | 1974-03-28 | 1977-01-14 | Hoechst Ag |
-
1977
- 1977-12-23 FR FR7738958A patent/FR2412272A1/en active Granted
-
1978
- 1978-09-04 BE BE190236A patent/BE870184A/en not_active IP Right Cessation
- 1978-09-11 GR GR57195A patent/GR64988B/en unknown
- 1978-09-18 NL NL7809454A patent/NL7809454A/en not_active Application Discontinuation
- 1978-09-21 ES ES473548A patent/ES473548A1/en not_active Expired
- 1978-09-21 DE DE19782841077 patent/DE2841077A1/en not_active Withdrawn
- 1978-09-21 PT PT68581A patent/PT68581A/en unknown
- 1978-09-22 CH CH990378A patent/CH626238A5/fr not_active IP Right Cessation
- 1978-10-03 OA OA56626A patent/OA06066A/en unknown
- 1978-10-06 ZA ZA00785665A patent/ZA785665B/en unknown
- 1978-10-10 LU LU80358A patent/LU80358A1/en unknown
- 1978-10-19 SE SE7810911A patent/SE7810911L/en unknown
- 1978-10-26 CA CA314,446A patent/CA1092932A/en not_active Expired
- 1978-10-27 IT IT83492/78A patent/IT1192751B/en active
- 1978-10-27 FI FI783283A patent/FI66112C/en not_active IP Right Cessation
- 1978-11-09 GB GB7843893A patent/GB2012553B/en not_active Expired
- 1978-11-10 NO NO783790A patent/NO148139C/en unknown
- 1978-12-04 JP JP53149897A patent/JPS597312B2/en not_active Expired
- 1978-12-22 DK DK576978A patent/DK576978A/en not_active Application Discontinuation
- 1978-12-27 AT AT0929378A patent/AT366896B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CH626238A5 (en) | 1981-11-13 |
| PT68581A (en) | 1978-10-01 |
| ATA929378A (en) | 1981-10-15 |
| DK576978A (en) | 1979-06-24 |
| ES473548A1 (en) | 1979-04-01 |
| FI66112C (en) | 1984-09-10 |
| NL7809454A (en) | 1979-06-26 |
| NO148139C (en) | 1983-08-17 |
| IT1192751B (en) | 1988-05-04 |
| FR2412272B1 (en) | 1980-08-22 |
| IT7883492A0 (en) | 1978-10-27 |
| ZA785665B (en) | 1979-09-26 |
| AT366896B (en) | 1982-05-10 |
| GB2012553B (en) | 1982-06-16 |
| OA06066A (en) | 1981-06-30 |
| SE7810911L (en) | 1979-06-24 |
| FI66112B (en) | 1984-05-31 |
| NO148139B (en) | 1983-05-09 |
| LU80358A1 (en) | 1979-03-19 |
| JPS54117099A (en) | 1979-09-11 |
| NO783790L (en) | 1979-06-26 |
| GB2012553A (en) | 1979-08-01 |
| BE870184A (en) | 1979-01-02 |
| FI783283A (en) | 1979-06-24 |
| GR64988B (en) | 1980-06-11 |
| JPS597312B2 (en) | 1984-02-17 |
| FR2412272A1 (en) | 1979-07-20 |
| DE2841077A1 (en) | 1979-07-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |