JP2767322B2 - Coaxial smoking filter with separate tow and web filters - Google Patents

Abstract

A concentric smoking filter (12) in which one of the filter media (20 or 21) is a fibrous tow, such as fibrous cellulose acetate tow, and one of the filter media (21 or 20) is a web material, such as paper, is provided. The filter improves the taste, particularly, of "ultra-light" cigarettes. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to smoking filters, in particular to coaxial smoking filters. More particularly, the present invention relates to concentric smoking filters having coaxially disposed tow and web filter materials.

[0002] Most smoking filters, especially cigarette filters, which are marketed as part of cigarettes, consist of a towed cylindrical rod or plug of plasticized cellulose acetate fibers. Some filters have a recessed mouth end or consist of two plugs with a space between them end to end, this space being empty or filled with another material such as charcoal. It is a modification of the filter. It is also known to have several plugs adjacent to each other, with each plug having such a filter that differs in density or other properties.

It is also known to use a filter material other than cellulose acetate. One such material is a suitable sheet or web material. The web material focused on the cylindrical plug can be other web materials including cellulose acetate in paper or sheet form. When using such web materials as filters, they are often corrugated before focusing.
Shrinked to improve the tensile strength of the paper web.

[0004] Some of these different materials and different configurations are combined. For example, it is also known to provide a filter having two or more adjacent tows, at least one of which is cellulose acetate tow and at least one of which is web material.

[0005] Finally, it is known to provide a coaxial filter in which two different forms of cellulose acetate tow (eg of different densities) are formed in the filter. One cellulose acetate tow forms a cylindrical core, while the other tow forms an annular surrounding layer.

[0006] Smoking filters have a resistance to inhalation (R
Characterized by a variety of parameters, including the pressure drop measured as the height of the water column, referred to as TD), and the efficiency measured as a percentage of total particulate matter (TPM) in the unfiltered smoke stream captured by the filter. Is represented. The RTD of the filter affects the way the smoker accepts the filter by the stiffness that the smoker must withdraw to accept the desired amount of smoke, while the filter efficiency regulates the amount of TPM delivered in the smoke .

[0007] While web filters, especially paper filters, are more efficient than tow filters, web materials, especially paper, add the lack of taste to smoke which reduces smoker satisfaction. Furthermore, the appearance of the visible smoke component adhering to the edge of the paper filter is much less homogeneous and spotty than cellulose acetate tow, which also affects the aesthetic effect.
This difference in appearance is believed to result from the flow of material deposited in the channels formed by the corrugations and the manner in which the web is collected during plug manufacturing.

[0008] As consumer preferences tend to be toward low-delivery cigarettes, there is an increasing demand for high-efficiency filters that enable low-delivery without increased RTD. However, the high efficiency of paper filters has not previously been available due to the negative consumer effects of paper filters.

It would be desirable to be able to provide a high efficiency filter that provides low delivery while also providing acceptable taste, RTD and other aesthetic benefits.

It is an object of the present invention to provide an acceptable taste, RTD
It is another object of the present invention to provide a high-efficiency filter which produces a low output while giving other aesthetic effects.

In accordance with the present invention, there is provided a smoking filter having a first filter plug having a central core of a first filter material and a surrounding layer of a second filter material surrounding the central core. One of the first and second filter materials is cellulose acetate tow, and the other first and second filter materials are collected and corrugated web material. If a filter is attached to a smoking article and the smoking article delivers a particular concentration of particulate matter when smoked, the taste of the smoking article is a taste associated with a concentration of total particulate matter higher than that particular concentration.

The above and other objects of the present invention will become apparent from the following description with reference to the accompanying drawings. In the drawings, the same parts have the same reference numerals.

According to the present invention, when a coaxial filter is made using paper or other web material for the core and cellulose acetate tow around it, or vice versa, a high quality filter without the absence of taste from the paper. It has been surprisingly found that not only a filtration effect is achieved, but also a cigarette having a low TPM delivery with the taste of a cigarette having a high TPM delivery.

As shown in FIGS. 1 and 2, cigarette 10
Includes a first preferred embodiment of a tobacco rod 11 and a filter 12 according to the invention. The cigarette stick 11 is made of the usual packaging material 1
3 while the filter 12 is wrapped in a conventional mouthpiece 14. The filter 12 includes a cellulose acetate tow peripheral layer 20 and a central paper core 21. The cellulose acetate perimeter layer 20 is preferably a conventional cellulose acetate tow wrapped with a porous plug wrapping material 22, however, if desired, a vapor bond or vapor bonding of the outer surface of the perimeter layer 20 to create a filter that does not need to be wrapped. Self-supporting filter rod techniques such as spray coating can be used. The paper core 21 is a paper web that is corrugated, bundled in a cylindrical shape, and wrapped with plug wrapping paper 23.

The paper wrapping material 23 improves the workability of the core 21 as well as its aesthetic appearance, and also helps to ensure substantially perfect coaxiality. Flavors and other additives, such as soluble tobacco components, can be applied to plug wrap 23 to enhance the subjective effect of the filtered smoke. Similar results are obtained from plug-containing material 2 from tobacco-containing materials such as reconstituted tobacco materials.
3 can also be achieved. The plug wrapping material 23 is preferably porous to allow free movement of smoke and air in the radial direction between the surrounding layer 20 and the core 21. At the same time, the presence of the plug wrapping material 23 helps prevent smoke from flowing along the interface between the surrounding layer 20 and the core 21.

The most preferred example of the filter 12 is about 24.4
It has a circumference of 5 mm and an average weight of about 258 mg. Core 21
Is preferably about 60% of the total cross-sectional area of the filter 12. Filter 12 is preferably about 130 mm
W. G. FIG. Or about 160 mmW. G. FIG. The center core 21 has an RTD of about 350 mmW. G. FIG. Or about 450
mmW. G. FIG. It is preferred that More preferably, the filter 12 is about 146 mmW. G. FIG. The center core 21 has an RTD of about 400 mmW. G. FIG. It is.

In a particularly preferred embodiment, the cellulose acetate tow of the perimeter layer 20 has a denier per fiber of 8 deniers, a total denier of 3000 and a Y cross section of 8.0.
/ 30000 cellulose acetate tow is preferred. The core 21 is preferably 100% cellulose semi-creped softwood pulp with 10% transverse crepe to add tensile strength. Such papers are available from Tela Papilluf Abrik A. G. of Baruchutal, Switzerland.

The cigarette 10 has a suitable vent 15 in the mouthpiece 14, and is preferably vented from about 65% to about 75%, more preferably about 67%. If the surface of the filter 12 is not air permeable, appropriate holes are also provided in the filter 12.

FIGS. 3 and 4 show a cigarette having a second preferred example of a filter 31 similar to the construction of the filter 12, except that the core 40 is a tow material and the surrounding layer 41 is a web material. Similarly, in this example, the plug packaging material 42 necessarily contains the web material of the surrounding layer 41, while the tow core 40 can be made using a self-supporting filter rod as described above, so that the Plug packaging material or other permeable packaging material 4
3 is optional.

The most preferred example of the filter 31 is about 2
It has a circumference of 4.45 mm and an average weight of about 240 mg. The average sectional area of the core 40 is about 60% of the total area of the filter 31.
Preferably. Filter 31 is about 165mm
W. G. FIG. To about 195 mmW. G. FIG. The center core 40 has an RTD of about 285 mmW. G. FIG. Or about 385
mmW. G. FIG. It is preferred that More preferably, the filter 31 is about 182 mmW. G. FIG. The center core 40 has an RTD of about 334 mmW. G. FIG. It is.

In this example, the cellulose acetate tow of the core 40 is 1.6 denier, 350
1.6 / 350 with a total denier of 00 and a Y-profile
00 cellulose acetate tow is preferred. The web of the surrounding layer 41 was used for the core of the filter 12,
Preferably, it is the same 100% cellulose semi-creped softwood pulp paper creped 10% transversely for added tensile strength.

Preferably, the cigarette 30, as in the cigarette 10, is provided with a suitable vent in the mouthpiece 14 and is ventilated to about 65% to about 75%, more preferably up to about 75%.

FIG. 5 shows a cigarette 50 having a third preferred embodiment of a filter 51 according to the present invention. Filter 51 is a so-called double filter and is made up of two adjacent filter segments 52,53. The filter segment 52 adjacent to the tobacco rod 11 is a coaxial filter as described above, and includes the core 54 and the surrounding layer 5.
One of the webs 5 is of a web material, the core 54 and the surrounding layer 55.
The other is of tow material. The filter segment 53 at the mouth end is a normal toe filter such as a cellulose acetate filter, and is provided mainly for cosmetics. Nevertheless, segment 53 has filtering and RTD characteristics, and segment 53 is
1 must be adjusted to have the desired properties.

In the preferred form of this example, segment 52 is constructed like filter 12, but 18-2.
It has a length of only 0 mm, while the segment 53 is a plug having a length of 7-9 mm, 2.6 denier per fiber, 42,000 total denier and 2.6 / 42000 denier for a tow having a Y-profile. All Filter RTD
Is about 125 mmW. G. FIG. To about 175 mmW. G. FIG. , Preferably about 141 mmW. G. FIG. It is. R of segment 53
TD is about 15mmW. G. FIG. To about 45 mmW. G. FIG. , Preferably about 36 mmW. G. FIG. It is. RT of segment 52
D is about 85 mmW. G. FIG. To about 175 mmW. G. FIG. , Preferably about 93 mmW. G. FIG. It is. The RTD of the paper core of the segment 52 is about 250 mmW. G. FIG. To about 450 mmW.
G. FIG. , Preferably about 267 mmW. G. FIG. It is. The cigarette 50 made in this example of the filter 51
And has a suitable vent and is ventilated with about 65% to about 75% ventilation, preferably about 71% ventilation.

FIG. 6 shows a cigarette 60 having a fourth example of a filter 61 according to the present invention. Filter 61
Is a recessed filter made from a filter segment 62 recessed into the mouthpiece 14 at 63. Cigarette stick 1
The filter segment 62 adjacent to 1 is a coaxial filter as described above, one of the core 64 and the surrounding layer 65 is of a web material, and the other of the core 64 and the surrounding layer 65 is of a tow material.

The filter parameters described herein are for an 85 mm cigarette. It should be understood that the filter according to the invention can also be used for longer cigarettes. When applied to long cigarettes, the filter parameters must be adjusted according to the knowledge of those skilled in the art.

[0027]

[Example 1] Tow in the surrounding layer was converted to one fiber.
8.0 denier, 8.0 / with a total denier of 25000
Except that 25000 cellulose acetate tow was used, a filter according to the most preferred example described above in connection with FIGS. 1 and 2 was made and incorporated into an ultralight tobacco rod having the following characteristics: cigarette 487 mg total RTD 107 mmW. G. FIG. Filter RTD 146 mmW. G. FIG. Ventilation 67% Suction length 32.0mm

The cigarette was smoked in a smoking machine under FTC conditions and the following results were obtained: TPM 1.8 mm nicotine 0.16 mg water 0.21 mg tar 1.5 mg number of inhalations 6.2

[0029] A cigarette producing 1.5 mg of tar was also smoked by a professional smoker;
Reported to have a cigarette taste producing mg of tar. With 67% ventilation, the filter has about 76% efficiency. With no ventilation, the efficiency had about 61%.

Even though most of the filtrate adhered to the web core, the cigarette adhered more to the tow filter when compared to the web filter, and showed a visible deposition pattern of the filtrate at the end of the filter. This is believed to be the result of smoke being forced into the wick 21 as ventilation is introduced at the holes 15 and then spreading back through the permeable wrap 23 into the surrounding tow layer 20.

[0031]

Example 2 A filter according to the preferred form of the example of FIG. 5 was made and incorporated into a super light tobacco rod having the following characteristics: Tobacco 429 mg Total RTD 93 mmW. G. FIG. Filter RTD 141 mmW. G. FIG. Ventilation 71% Suction length 32mm

The cigarette was smoked in a smoker under FTC conditions and the following results were obtained: TPM 1.6 mg nicotine 0.13 mg water 0.10 mg tar 1.4 mg number of inhalations 5.3

As in Example 1, the cigarette was smoked by a professional smoker, who had 4-5 cigarettes.
Reported as having a cigarette taste producing mg of tar.

The filters of the present invention improve the taste of low delivery cigarettes. Also, the filters of the present invention can provide performance similar to high delivery performance. For example, a medium outgoing cigarette may be perceived as a full flavor cigarette. Thus, it has been found that there is provided a high efficiency filter that produces low delivery while providing acceptable taste and other aesthetic effects. Those skilled in the art will recognize that the present invention may be practiced other than by way of the foregoing examples, which are by way of illustration and not limitation, and the invention is limited only by the claims.

[Brief description of the drawings]

FIG. 1 is a mouth end perspective view of a cigarette having a first example of a filter according to the present invention.

FIG. 2 is a radial cross-sectional view of the filter of FIG.

FIG. 3 is a mouth end perspective view of a cigarette having a second example of a filter according to the present invention.

FIG. 4 is a radial sectional view of the filter of FIG. 3;

FIG. 5 is a mouth end perspective view of a cigarette having a third example of a filter according to the present invention.

FIG. 6 is a mouthpiece perspective view of a cigarette having a fourth example of a filter according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cigarette 11 Tobacco stick body 12 Filter 13 Packaging material 14 Inlet 15 Vent hole 20 Surrounding layer 21 Central core 22 Plug packaging material 23 Plug wrapping paper 30 Cigarette 31 Filter 40 Core 41 Surrounding layer 42 Plug packaging material 43 Permeable packaging material 50 Cigarette Reference Signs List 51 filter 52 filter segment 53 filter segment 54 core 55 peripheral layer 60 cigarette 61 filter 62 filter segment 63 recess 64 core 65 peripheral layer

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Gas Day Kerithosis 23236, Virginia, USA, Richmond, Kings, Crown, Road 9030 (72) Inventor Morris F. White Jr., 22228, Virginia, United States 23228 , Forest, Glen, Drive 1734 (56) References JP-A-58-198284 (JP, A) JP-A-58-155073 (JP, A) JP-B-61-12676 (JP, B1) JP-B-2 -4275 (JP, B2) U.S. Pat. No. 3,906,611 (US, A) UK Patent 2012554 (GB, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A24D 3/00

Claims (23)

(57) [Claims] 1. A central core (21, 4) of a first filter material.
0 , 54 , 64) and a filter plug (12, 31, 52, 62) having a peripheral layer (20, 41, 55, 65) of a second filter material surrounding the central core.
And, wherein one of the first and second filter materials is a fibrous tow, said first and second filter others web material der which is the waveform is focused Ru smoking filter odor materials
And the filter is about 130 mmW. G. FIG. Or about 1
95 mmW. G. FIG. And the central core (2
1,40) is about 285 mmW. G. FIG. Or about 450mm
W. G. FIG. A smoking filter having a suction resistance . 2. A smoking filter according to claim 1, wherein said first filter material (21) is said web material and said second filter material (20) is said fiber tow. 3. The smoking filter of claim 2 wherein said second filter material is a cellulose acetate tow having about 8.0 denier per fiber and a total denier of 25,000 to 30,000, preferably 30,000. Wherein said first filter material (40) is said fibrous tow, smoking filter of claim 1, wherein the second filter material (41) is said web material. 5. The smoking filter of claim 4 wherein said first fiber material is a cellulose acetate tow having about 1.6 denier per fiber and about 35,000 total denier per fiber. 6. Any of smoking filter of claim 1 to 5, characterized in that said web material is paper. 7. A smoking filter according to claim 6 , wherein said paper is creped before corrugating and converging. 8. Any of smoking filter of claim 1 to 5, characterized in that said web material is a nonwoven web. 9. The smoking filter according to claim 8 , wherein said nonwoven web is a cellulose acetate sheet. 10. Any of the smoking filter of claim 1 to 9, characterized in that the focusing waveform web material is wrapped in a plug wrap material (23 and 42). 11. The smoking filter according to claim 10 , wherein the plug wrapping material (23) is porous. 12. The method of claim 10 or 1 wherein the plug wrap material (23) is characterized in that it contains a flavor ingredient
1 smoking filter. 13. The plug packaging material (23) is reconstituted.
Smoking filter of claim 12, characterized in that it contains such smoke grass containing material of the tobacco sheet. 14. A smoking filter according to claim 12 , wherein the plug wrapping material (23) comprises a plug wrapper with a flavor component, preferably a soluble tobacco component . 15. A smoking filter according to claim 1 , 2 or 3 having a filtration efficiency of about 61% non-aerated. Either smoking filter of 16. Claim 1-15, characterized in that it comprises a ventilation rate of 65% to 75%. 17. Any of the smoking filter of claim 1-16, characterized in that said core (21,40) has a cross-sectional area occupying about 60% of the total cross-sectional area of the filter. 18. The filter according to claim 1, wherein said filter is about 146 mmW.
G. FIG. And the central core (21) is about 400
mmW. G. FIG. Claim 1, 2 or 3 of the smoke filter is characterized by having a resistance to draw. 19. The filter according to claim 19, wherein the filter has a width of about 165 mmW.
G. FIG. To about 195 mmW. G. FIG. And the central core (40) has a suction resistance of about 285 mmW. G. FIG. Or about 38
5 mmW. G. FIG. Smoking filter of claim 1, 4 or 5, characterized in that it has a resistance to draw. 20. Further, the first filter plug (5)
Either smoking filter of claim 1 to 17, characterized in that it contains cellulose acetate tow adjacent to 2) the second filter plug (53). 21. The first filter material is the web material, the second filter material is the fiber tow, and the first filter plug (52) is 85 mm.
W. G. FIG. To about 175 mmW. G. FIG. Of about 250 mmW. G. FIG. Or about 450
mmW. G. FIG. And the second filter plug (53) has a suction resistance of about 15 mmW. G. FIG. Or about 45mm
W. G. FIG. The filter has a suction resistance of about 125
mmW. G. FIG. To about 175 mmW. G. FIG. 21. The smoking filter according to claim 20 , wherein the filter has a suction resistance. 22. Surrounding mouthpiece (14) , said mouthpiece extending beyond one end of said filter plug (62) for attaching said filter to a cigarette and beyond the opposite end of said filter plug. The smoking filter according to any one of claims 1 to 19 , which extends to form a mouth end recess in the filter. 23. The peripheral layer (20) is formed from a central core (21).
19. It has a low suction resistance.
Any of the smoking filters.