WO2016025967A1 - Absorbent article and its use - Google Patents

Absorbent article and its use Download PDF

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Publication number
WO2016025967A1
WO2016025967A1 PCT/AT2015/000061 AT2015000061W WO2016025967A1 WO 2016025967 A1 WO2016025967 A1 WO 2016025967A1 AT 2015000061 W AT2015000061 W AT 2015000061W WO 2016025967 A1 WO2016025967 A1 WO 2016025967A1
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WO
WIPO (PCT)
Prior art keywords
absorbent article
filaments
dtex
lyocell
cigarette
Prior art date
Application number
PCT/AT2015/000061
Other languages
French (fr)
Inventor
Andrew Slater
Gert Kroner
Gisela Goldhalm
Original Assignee
Lenzing Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lenzing Ag filed Critical Lenzing Ag
Publication of WO2016025967A1 publication Critical patent/WO2016025967A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/02—Loose filtering material, e.g. loose fibres
    • B01D39/04—Organic material, e.g. cellulose, cotton
    • 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
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
    • A24D3/10—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/45—Gas separation or purification devices adapted for specific applications
    • B01D2259/4541—Gas separation or purification devices adapted for specific applications for portable use, e.g. gas masks

Definitions

  • This invention relates to an absorbent article which comprises crimped continuous Lyocell filaments and its use, particularly for the manufacture of cigarettes.
  • Fiber-containing filters for cigarettes are well-known.
  • the patent US 5,839,448 proposes filter body elements comprising entangled continuous Lyocell filaments.
  • the filaments are preferably in the form of hydroentangled spread tow.
  • US 2014/0026909 A1 discloses mixed fiber slivers for use in the manufacture of cigarette filter elements. Despite it was field 17 years after the publication of US 5,839,448 the problem of degradability of used cigarette filters was still unsolved and the use of pure cellulose acetate filters was still state of the art. As an approach to solve this problem US 2014/0026909 A1 describes blends of discontinuous cellulose acetate staple fibers with second kinds of staple fibers, amongst others regenerated cellulose staple fibers. Thick fiber tows of about 1 ,5 mio deniers are cut, the resulting staple fibers are blended and by carding and subsequent drafting slivers of about 40,000 denier are obtained.
  • Example 1 of US 2014/0026909 A1 describes the use of rayon staple fibers as the second kind of staple fibers to be blended with cellulose acetate staple fibers, but states that nevertheless no optimal product was obtained. The resulting product was splotchy in several areas, while the manufacturing process is expensive due to the manifold steps.
  • WO 2014/009498 describes another way to obtain degradable cigarette filters. It discloses a set of means including the use of Lyocell fibers with a linear density of from 0,5 to 8,0 denier, but preferably of from 2,0 to 3,2 denier, and a crimp rate of from 30 to 100 crimps per 10 cm, but preferably of from 60 to 80 crimps per 10 cm. This manufacturing process, too, is expensive due to the numerous steps of cutting and eventually blending.
  • the filaments have a single filament titer of between 0,7 and 2,4 dtex and a crimp rate of from 40 to 75 crimps per 10 cm.
  • the single filament titer is between 0,7 and 1 ,5 dtex.
  • the crimp rate is between 50 and 65 crimps per 10 cm. The smaller titer surprisingly results in a more even filter structure than with thicker titer.
  • the Lyocell tow can be manufactured according to the generally known Lyocell process as described among others in US 5,839,448.
  • the absorbent article according to this invention preferably consists of a segment of a continuous tow which has a total linear density of between 35,000 and 60,000 dtex, preferably between 45,000 and 55,000 dtex.
  • Such a tow can be directly converted into a filter element, usable e.g. in a cigarette filter.
  • this absorbent article contains only said crimped continuous Lyocell filaments. This has the additional advantage that it can be obtained directly from a Lyocell spinning machine without further blending with fibers of other nature. This again is more economic than the known methods of manufacturing filter elements for e.g. cigarette filters.
  • the absorbent article is a filter body for the filtration of fluid media, such as gases or liquids.
  • the fluid media is a gas, preferably origination from a combustion process.
  • the absorbent article is a filter body for a cigarette filter. Equally usable is the absorbent article as a filter body for other smoking articles like cigars, cigarillos, pipes or mouthpieces for such smoking articles.
  • the absorbent article according to the invention can be used advantageously due to its easy and economic manufacture, the chemically stability of cellulose against many solvents and other chemicals and its structurally good filtration properties.
  • the single filament titer is between 0,7 and 1 ,5 dtex.
  • the crimp rate is between 50 and 65 crimps per 10 cm.
  • smoking articles include cigars, cigarillos, pipes or mouthpieces for smoking articles.
  • the filaments can be coated with cellulose acetate- and/or cellulose acetate derivate-containing coatings, possibly in combination with triacetin.
  • Lyocell filaments are used which are containing polyethylene glycole which was incorporated into the never-dried Lyocell filaments during their manufacture before drying the coagulated and washed filaments.
  • This process step can generally be done only by a Lyocell producer.
  • other functional additives can be incorporated into the filaments during or after their manufacture.
  • Polyethylene glycole and similar substances can be applied to the filaments even after the crimping process before packaging.
  • Example 1 A cellulose acetate tow according to the state of the art (example 1) and an uncrimped Lyocell tow (example 2) were compared to two differently crimped Lyocell tows according to the invention (examples 3, 4).
  • the Lyocell tows were manufactured according to the generally known Lyocell process as described among others in US 5,839,448, but without hydroentanglement. Parameters and properties are listed in Table 1.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

This invention relates to an absorbent article which comprises crimped continuous Lyocell filaments and its use, particularly for the manufacture of cigarettes.

Description

Absorbent article and its use
This invention relates to an absorbent article which comprises crimped continuous Lyocell filaments and its use, particularly for the manufacture of cigarettes.
Prior Art
Fiber-containing filters for cigarettes are well-known. In addition to the widely used cellulose acetate fibers the patent US 5,839,448 proposes filter body elements comprising entangled continuous Lyocell filaments. The filaments are preferably in the form of hydroentangled spread tow. The
hydroentanglement is in principle well known but creates additional efforts and production costs. US 5,839,448 also discloses that the Lyocell filaments may be crimped, but gives no further details in this respect.
US 2014/0026909 A1 discloses mixed fiber slivers for use in the manufacture of cigarette filter elements. Despite it was field 17 years after the publication of US 5,839,448 the problem of degradability of used cigarette filters was still unsolved and the use of pure cellulose acetate filters was still state of the art. As an approach to solve this problem US 2014/0026909 A1 describes blends of discontinuous cellulose acetate staple fibers with second kinds of staple fibers, amongst others regenerated cellulose staple fibers. Thick fiber tows of about 1 ,5 mio deniers are cut, the resulting staple fibers are blended and by carding and subsequent drafting slivers of about 40,000 denier are obtained. Example 1 of US 2014/0026909 A1 describes the use of rayon staple fibers as the second kind of staple fibers to be blended with cellulose acetate staple fibers, but states that nevertheless no optimal product was obtained. The resulting product was splotchy in several areas, while the manufacturing process is expensive due to the manifold steps.
WO 2014/009498 describes another way to obtain degradable cigarette filters. It discloses a set of means including the use of Lyocell fibers with a linear density of from 0,5 to 8,0 denier, but preferably of from 2,0 to 3,2 denier, and a crimp rate of from 30 to 100 crimps per 10 cm, but preferably of from 60 to 80 crimps per 10 cm. This manufacturing process, too, is expensive due to the numerous steps of cutting and eventually blending.
Problem
In view of this state of the art the problem underlying this invention was to provide an absorbent article which is biodegradable and can be manufactured less expensive than the known absorbent articles, especially those which are used for the manufacture of cigarette filters.
Description
It is an object of the present invention to provide an absorbent article which comprises continuous Lyocell filaments, wherein the filaments have a single filament titer of between 0,7 and 2,4 dtex and a crimp rate of from 40 to 75 crimps per 10 cm. Surprisingly it was found that by the use of low titre Lyocell fibers a high crimp intensity as well as a high radial expansion of the tow after the blooming step can be attained. Blooming - extending the as-produced tow to de-synchronise the crimp between neighbouring filaments - is useful to fill the filter rod to attain good roundness and a firm filter rod. It is also used to control the so-called "draw" - the pressure drop along the filter rod. US 3,202,155 describes a possible blooming method and the expert skilled in the art knows even more.
Preferably the single filament titer is between 0,7 and 1 ,5 dtex. Also preferably the crimp rate is between 50 and 65 crimps per 10 cm. The smaller titer surprisingly results in a more even filter structure than with thicker titer.
The Lyocell tow can be manufactured according to the generally known Lyocell process as described among others in US 5,839,448. The absorbent article according to this invention preferably consists of a segment of a continuous tow which has a total linear density of between 35,000 and 60,000 dtex, preferably between 45,000 and 55,000 dtex. Such a tow can be directly converted into a filter element, usable e.g. in a cigarette filter.
In a preferred embodiment this absorbent article contains only said crimped continuous Lyocell filaments. This has the additional advantage that it can be obtained directly from a Lyocell spinning machine without further blending with fibers of other nature. This again is more economic than the known methods of manufacturing filter elements for e.g. cigarette filters.
Preferably the absorbent article is a filter body for the filtration of fluid media, such as gases or liquids. Preferably the fluid media is a gas, preferably origination from a combustion process. In an especially preferred embodiment the absorbent article is a filter body for a cigarette filter. Equally usable is the absorbent article as a filter body for other smoking articles like cigars, cigarillos, pipes or mouthpieces for such smoking articles.
But also for other filtration processes the absorbent article according to the invention can be used advantageously due to its easy and economic manufacture, the chemically stability of cellulose against many solvents and other chemicals and its structurally good filtration properties.
It is another object of the present invention to provide the use of an absorbent article for the manufacture of a smoking article, preferably a cigarette, wherein the absorbent article comprises crimped continuous Lyocell filaments which have a single filament titer of between 0,7 and 2,4 dtex and a crimp rate of from 40 to 75 crimps per 10 cm. Preferably the single filament titer is between 0,7 and 1 ,5 dtex. Also preferably the crimp rate is between 50 and 65 crimps per 10 cm.
Other smoking articles include cigars, cigarillos, pipes or mouthpieces for smoking articles. In a preferred embodiment the filaments can be coated with cellulose acetate- and/or cellulose acetate derivate-containing coatings, possibly in combination with triacetin.
In an as well preferred embodiment of the invention Lyocell filaments are used which are containing polyethylene glycole which was incorporated into the never-dried Lyocell filaments during their manufacture before drying the coagulated and washed filaments. This process step can generally be done only by a Lyocell producer. Also other functional additives can be incorporated into the filaments during or after their manufacture. Polyethylene glycole and similar substances can be applied to the filaments even after the crimping process before packaging.
The invention will now be illustrated by examples. These examples are not limiting the scope of the invention in any way. The invention includes also any other embodiments which are based on the same inventive concept
Examples
A cellulose acetate tow according to the state of the art (example 1) and an uncrimped Lyocell tow (example 2) were compared to two differently crimped Lyocell tows according to the invention (examples 3, 4). The Lyocell tows were manufactured according to the generally known Lyocell process as described among others in US 5,839,448, but without hydroentanglement. Parameters and properties are listed in Table 1.
Table 1:
Figure imgf000006_0001

Claims

Claims
1. An absorbent article which comprises continuous Lyocell filaments, wherein the filaments have a single filament titer of between 0,7 and 2,4 dtex and a crimp rate of from 40 to 75 crimps per 10 cm.
5 2. Absorbent article according to claim 1 which consists of a segment of a continuous tow which has a total linear density of between 35,000 and 60,000 dtex, preferably between 45,000 and 55,000 dtex.
3. Absorbent article according to claim 1 which contains only said crimped continuous Lyocell filaments.
i o 4. Absorbent article according to claim 1 which is a filter body for the filtration of fluid media.
5. Absorbent article according to claim 1 which is a filter body for a cigarette filter.
6. Use of an absorbent article for the manufacture of a smoking article, i s wherein the absorbent article comprises crimped continuous Lyocell filaments which have a single filament titer of between 0,7 and 2,4 dtex and a crimp rate of from 40 to 75 crimps per 10 cm.
7. Use according to claim 6, wherein the smoking article is a cigarette.
PCT/AT2015/000061 2014-08-20 2015-04-30 Absorbent article and its use WO2016025967A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA650/2014 2014-08-20
ATA650/2014A AT515930B1 (en) 2014-08-20 2014-08-20 Absorbent article and its use

Publications (1)

Publication Number Publication Date
WO2016025967A1 true WO2016025967A1 (en) 2016-02-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020207767A1 (en) * 2019-04-10 2020-10-15 Lenzing Aktiengesellschaft Lyocell fiber tow, its manufacture and use

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202155A (en) 1964-06-05 1965-08-24 Eastman Kodak Co Light weight cigarette filter
US5839448A (en) 1994-06-20 1998-11-24 Courtaulds Fibres (Holdings) Limited Absorbent articles
DE102007029831A1 (en) * 2007-06-28 2009-01-08 Reemtsma Cigarettenfabriken Gmbh Process for producing tobacco smoke filters
US20100281662A1 (en) * 2007-07-11 2010-11-11 Lenzing Aktiengesellschaft Filling Fiber With Improved Opening Performance, Method For Its Production And Its Use
WO2014009498A1 (en) 2012-07-13 2014-01-16 Philip Morris Products S.A. Degradable filter for smoking articles
US20140026909A1 (en) 2012-07-25 2014-01-30 R.J. Reynolds Tobacco Company Mixed fiber sliver for use in the manufacture of cigarette filter elements
WO2015046943A1 (en) * 2013-09-26 2015-04-02 코오롱인더스트리 주식회사 Lyocell material for cigarette filter and method for preparing same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9404547D0 (en) * 1994-03-09 1994-04-20 Courtaulds Fibres Holdings Ltd Fibre production process
TW200936065A (en) * 2008-01-23 2009-09-01 Filtrona Int Ltd Tobacco smoke filter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202155A (en) 1964-06-05 1965-08-24 Eastman Kodak Co Light weight cigarette filter
US5839448A (en) 1994-06-20 1998-11-24 Courtaulds Fibres (Holdings) Limited Absorbent articles
DE102007029831A1 (en) * 2007-06-28 2009-01-08 Reemtsma Cigarettenfabriken Gmbh Process for producing tobacco smoke filters
US20100281662A1 (en) * 2007-07-11 2010-11-11 Lenzing Aktiengesellschaft Filling Fiber With Improved Opening Performance, Method For Its Production And Its Use
WO2014009498A1 (en) 2012-07-13 2014-01-16 Philip Morris Products S.A. Degradable filter for smoking articles
US20140026909A1 (en) 2012-07-25 2014-01-30 R.J. Reynolds Tobacco Company Mixed fiber sliver for use in the manufacture of cigarette filter elements
WO2015046943A1 (en) * 2013-09-26 2015-04-02 코오롱인더스트리 주식회사 Lyocell material for cigarette filter and method for preparing same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020207767A1 (en) * 2019-04-10 2020-10-15 Lenzing Aktiengesellschaft Lyocell fiber tow, its manufacture and use
CN113614296A (en) * 2019-04-10 2021-11-05 连津格股份公司 Lyocell fibre tow, its production and use

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Publication number Publication date
AT515930B1 (en) 2016-01-15
AT515930A4 (en) 2016-01-15

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