DE1948336A1 - Smoking articles - Google Patents

Description

BRITISH-AMERICAN TOBACCO COMPANY LIMITED, Westminster House, 7 Millbank, London, S. V /. l / England

"Smoking articles"

The invention relates to a smoking article, in particular a cigarette.

From experimental work with automatic smoking machines it is known that the composition of the tobacco smoke of smoking articles by changes in the puff volume, the puff frequency and the speed the air flow can be changed while pulling. An examination of the results obtained from such experiments has show that the concentration of less volatile, undesirable components occurring in tobacco smoke during the first part of the puff is higher than during the later part.

The smoking article according to the invention is characterized by means for automatically dividing a puff into two successive ones Sections and by means for differently strong and / or separate filtering of the drawn during the two sections Smoke.

According to the invention an arrangement for attachment to conventional smoking articles has also been created, the means for automatically splitting a train into at least two

and
has the following sections / means for filtering the smoke drawn during the at least two SECTIONS to different degrees.

The first section of the train advantageously extends over the first quarter to the first half of the train.

009-824 / 1213 -2-

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Further advantages and features of the invention emerge from the description of two exemplary embodiments with reference to the drawing. In the drawing, ^L

Pig. 1 shows a longitudinal section through an embodiment of the invention in a schematic representation,

Fig. 2 shows a longitudinal section through a further embodiment of the invention in a schematic representation and

5 shows a diagram in which the pressure drop is plotted over time is.

The smoking article shown in Fig. 1 consists of a with Tobacco filled section 1, a valve assembly 2 and a filter section J5. For section 1, which is filled with tobacco it can be a conventional cigarette in which tobacco 4 is contained in a paper tube 5. The valve arrangement 2 has a short cylinder 6 the diameter of the cigarette made of metal or plastic and is connected to the tobacco-filled section 1 by means of an adhesive tape 7 in close contact with this j. A ; approximately completely circumferential, in the vicinity of the outer circumference 3 by:

/ the cylinder 6 extending, narrow annular passage ο j or ring of narrow passages allows a free flow of smoke during drawing. A larger axial passage 9 extending through the cylinder 6 is connected with addk axially extending radial openings lo, 11 with a further approximately annular passage 12, which extends over a considerable distance, but not completely over the length of the ^^ linder 6 extends, j the axial passage 9 is normally closed with a resiliently mounted adjacent the end j valve body to / filled with the tobacco overall j portion. In the exemplary embodiment, the valve body consists of a ball or a spherical shut-off element 15, which in the illustrated closed position, ie, viewed in the direction of flow, is above the radial opening

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009824/1213

openings lo, is held by a soft helical compression spring l4 which is arranged in the axial passage 9. The filter section 5, which is tightly and firmly connected to the valve arrangement 2 by means of an adhesive tape 15, consists of fibrous or leaf-shaped tobacco smoke filter material, known per se, in a casing 16. At least the outer area of the filter connected to the outlet opening of the annular passage has a higher density or higher smoke filter properties than the inner or axial area 18, from which it is separated by means of a cylindrical paper cuff 17 ¹ . A higher pressure drop occurs in the outer region 17 than in the inner or axial region 18.

If such a smoking article is used, so if on Filter section 3 is drawn, smoke is initially drawn only through the narrow continuously open passage 8 while the shut-off element 13 remains closed. This beginning section of the train flowing through the continuously open passage 8 is filtered by the filter section 17 at a high density. If the train is continued, the shut-off device is pulled back just behind the radial openings Io, whereby the smoke is made possible - since the axial passage 9 in middle region of its length is still "closed" via the annular passage 12 and the openings 11 to the Filter section l8 to flow with a smaller diameter. This is to the smoke path through the constantly open passage 8 and a bypass has been created for the filter section I7, which is shown in The scope and effect can be precisely determined.

With such an arrangement, the during the first section of the train produced smoke in filter section I7 more than the smoke produced during the later section of the train filtered in the filter section l8, whereby a more effective filtering and one that better suits the needs of the smoker Composition of the smoke emerging from the filter is achieved.

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ίThe smoking article according to Fig. 2 differs from that in ! Fig. 1 shown smoking article in that the inner filter j section l8a with lower density on its rear side as well as on [its scope of filter material higher density of the filter section 17a is surrounded. This makes a similarly differentiated one Filter effect achieved.

In Fig. 3 the pressure drop PD in a smoking article is according to of the invention plotted over time T, the example of one consisting of two sections being merely qualitative Train is shown, which consists of a short inlet section with a high pressure drop peak 19 to which a long one sustained low value 2o of the pressure drop follows. The curve diagram is not represented quantitatively, but the entire one For example, a train can be assumed to last for two seconds.

The invention is particularly advantageous for cigarettes, but can also be used advantageously for all other smoking articles to be brought.

0Ü9824 / -121 3

Claims (1)

Expectations
1. Smoking article, characterized by means for automatically dividing a puff into at least two successive sections and by means for differently strong and / or separate filtering of the smoke drawn during the at least two sections. 2.RAuchartikel according to claim 1, characterized by a valve arrangement (2) with a continuously open passage (8) and with an additional passage (9) closed by a valve. 5. Smoking article according to claim 2, characterized in that the valve arrangement (2) is actuated by the suction of the train, spring-loaded, the additional passage (9) releasing or closing ball valve (IJ, 14). 4. Smoking article according to claim 2 or 5 * characterized in that ' that the continuously open passage (8) opens into a filter area of high density (17, 17a) and the additional passage in a filter area of lower density (l8, l8a). 5. Smoking article according to claim 4, characterized in that the high-density filter area (17, 17a) surrounds the lower-density filter area (l8, l8a) at its periphery and optionally j at its rear end. j 6. smoking article according to one of claims 1 to 5> characterized in that the valve arrangement (2) is arranged behind a section (1) filled with tobacco. 7. A smoking article traces one of claims 1 to 6, characterized marked ■ in that the valve arrangement (2) (8) as outer constantly open passage ι an outer annular channel or on a -2- 009824/1213 1943336 Has ring arranged passages. 8. A smoking article characterized by j according to any one of claims 1 to ¹ J _1, that the additional passage (9) consists of an axial channel and, arranged around it and with this via radial openings (lo, 11) connected to the inner ring channel (12) consists ₃ wherein the ball valve (15) is arranged in front of the front radial openings (lo) and these j enables during the second leg of the train. 00 98 24/12 13 Blank page