CN1286598A - Cigarette with reduced gas phase - Google Patents

Abstract

The invention relates to a cigarette with a filter containing activated carbon. Said cigarette comprises a tobacco string wrapped in cirgarette paper, a double filter having a string-side part consisting of a tissue paper containing carbon, and a peripherally extending filter ventilation zone and located in the mouth-side part made of cellulose acetate. The tissue paper of the string-side filter part is a very bulky paper which contains 20 to 50 % wt microfine powdered active carbon. The ratio of condensate retention capacities of the string-side filter part to the mouth-side filter part ranges from 1 to 2. The air permeability of the cigarette paper is comprised between 40 and 100 coresta units and the filter ventilation grate is comprised between 5 and 60%.

Description

Reduce the cigarette of gas phase

The present invention relates to a kind of cigarette of defining with claim 1 preamble.

Known, by the material on the rich surface of active carbon one class is introduced the share that filter tip can reduce gaseous component in the smog.This kind optionally is detained and is directed at undesirable mouthfeel and changes, thereby makes the smoker refuse this series products.The trial that compensates this negative seondary effect be very hard (referring to DE4105500), complicated, also be very expensive.

Most of traditional gas-phase activity filter tips are the multiple filtration mouth, and this multiple filtration mouth is divided into three districts, and the mesozone contains surface active material, such as active carbon, sepiolite, silica gel etc.This system is very expensive on making, and has great shortcoming, the compression when promptly Qu stability is owing to smoking and can not be satisfactory.Another kind of solution is two filter structures, and small amount of activated is sprinkled near in the filter element of tobacco end in this structure.This structure is limited to the minimizing effect of gas phase, is not enough to a lot of application.For all known structure, common ground is the variation of taste, and the smoker thinks that this is the carbon flavor.

The thin paper of using carbon containing be a kind of significantly but still unsafty improvement, this carbon containing thin paper is mixed with the carbon dust (granularity＜15 μ m) that grinds superfinely.

The objective of the invention is to develop a kind of filter-tip cigarette of gas-phase activity (gasphasenaktiv) that has, this filter tip is very effective, and manufacturing price is suitable simultaneously.

Feature by claim 1 reaches this purpose.

The present invention relates to the cigarette with filter tip that a kind of band contains the filter tip of active carbon equally, and has:

A) tobacco of wrapping up by cigarette paper;

B) two filter tips, wherein the part of nearly tobacco one end is made up of the carbon containing thin paper, and

C) the filter tip ventilating area that flows to peripheral direction in the nearly mouth end parts, it is made up of acetyl cellulose;

D) thin paper of tobacco end filtration fraction is the bulk paper of a kind of volume, and this paper contains the activated carbon powder that grinds superfinely of 20-50% (weight).

E) the tobacco end filtration fraction is 1-2 with ratio near the condensing of mouth end filtration fraction-retentivity;

F) air permeability of cigarette paper is a 40-100 Coresta unit; And

G) the ventilative rate of filter is 5-60%.

Decision design of the present invention is the theme of dependent claims.

The voidage of the cigarette paper that cigarette with filter tip of the present invention adopts is than the high 30-60% of suitable cigarette that produces with the conventional filtration mouth, and the ventilative rate of its filter tip is than the low 10-60% of the ventilative rate of the filter tip of the suitable cigarette of producing with conventional filter tip.

The area weight of thin paper is about 40-60g/m ², its active carbon content is 15-50%, its thickness is 150-200 μ m.A kind of area weight of preferred version is 50g/m ², active carbon content is 30% (weight), thickness is 180 μ m.

In a special embodiment, core one filter tip that two filter-tip tobacco end filtration fractions are DE 42 05658 C2 is wherein crossed filter core and is made of the carbon containing thin paper, and as described in first embodiment, fuse is with one deck material parcel of saturating main plume hardly.This almost Smoke proof material for example can be made of the cellulose acetate ester fiber of densification.

Be surprised to find that once that not only gas phase was detained when utilizing the gas-phase activity material but also the combination of distinctive delay ratio of each fillter section and cigarette ventilation ratio plays conclusive effect.Delay ratio that table 1 is listed and ventilation are suitable especially than combination B, D and F.Combination A, C and E are known cigarette, and they will be by B of the present invention, D and the modification of F combination institute.

Carried out sense organ relatively by panel of expert, and provided following result: cigarette A and B just have any different on reactivity, and the reactivity of Type B is obviously low, promptly the consumer are said more not jerky and more not pungent.

Identical therewith cigarette C and D be difference to some extent on reactivity, and the tobacco flavor of D kind is more remarkable.

The expert also obtains identical result when relatively E is with F cigarette.The reactivity of F type is obviously low, but higher tobacco flavor is arranged.

Noticeable is that the delay coefficient of single fillter section increases with the reduction of coagulation value and nicotine value.Simultaneously, be identical cigarette flavor quality at least for reaching, must under the prerequisite that the minimizing filter tip is breathed freely, improve all kinds of voidages of comparing the cigarette paper of cigarette simultaneously.The particle size distribution that reason may be main plume that flavor quality improves relatively, this distribution mainly is subjected to different flowing velocities, thus the difference of tobacco is gradually put out Temperature Influence.Test shows, when people are mated test cigarette aspect flowing mutually with contrast cigarette, so-called carbon flavor will occur, and flavor quality descends.

In order to adjust the delay ratio of tobacco end to the filtration fraction of mouth end, the filtration fraction of lip-syncing end, except that the acetic acid vinegar one single-filtering mouth of knowing, also can adopt other embodiment: for example, lean on the coaxial configuration of mouth end filtration fraction that while and the best independently of each other possibility of regulating the expection delay of cigarette and expecting unlimited resistance to suction can be provided.

Table 1

	Full flavor		Light-duty		Ultra-low tar
								????A	????B	????C	????D	????E	????F
Length overall (mm)	????84	????84	????84	????84	????84	????84
							Cigarette long (mm)	????63	????63	????59	????59	????59	????59
Filter tip long (mm)	????21	????21	????25	????25	????25	????25
							Cigarette weight (mg)	????820	????820	????690	????690	????620	????620
Resistance to suction (daPa)			????75	????75	????140
							The filter tip type	Single filter tip	Two filter tips	Single filter tip	Two filter tips	Single filter tip	Two filter tips
Filter-tip material	Cellulose acetate		Cellulose acetate		Cellulose acetate
							Single denier	????3.0y				?????2.1y
Total denier	????35.000				?????55.000
							Factory	????Rhodia				????Rhodia
The tobacco end element:
							Long (mm)		????13		????13		????13
Resistance to suction (daPa)		????13		????65		????97
							Material		Activated carbon paper		Activated carbon paper		Activated carbon paper
Mouth end member spare:
							Long (mm)		????8		????12		????12
Resistance to suction (daPa)		????24		????28		????33
							Material
Single denier		????2.5y		???3.04y		????2.54y
							Total denier		????35.000		???35.000		????35.000
Coagulation (mg/cig.)	????12.2	????12.0	????7.2	???7.0	?????2.3	????2.0
							Nicotine (mg/cig.)	????0.80	????0.83	????0.64	???0.66	????0.22	????0.24
Paper voidage (coresta)	????24	????43	????60	????80	????40	????80

Table 1 is continuous

	Full flavor		Light-duty		Ultra-low tar
								????A	????B	????C	????D	????E	????F
Filter tip gas permeability (%)	????20	????17	????40	????35	????70	????60
							Total holdup (%)	????38	????38	????50	????50	????70	????70
Single delay (%)
							(tobacco end)		????19		????28		????45
(mouth end)		????19		????22		????25
							Be detained coefficient		????1		????1.27		????1.8
(tobacco end/mouth end)

Claims (3)

1. a band contains the cigarette with filter tip of active carbon filtration mouth, has:

A) tobacco of wrapping up with cigarette paper;

B) two filter tips, wherein the part of nearly tobacco end is made up of the carbon containing thin paper; And

C) the filter tip ventilating area that flows to peripheral direction in the part of nearly mouth end it form by acetyl cellulose;

D) thin paper of tobacco end filtration fraction is the bulk paper of a kind of volume, and this paper contains the levigate activated carbon powder for 20-50% (weight);

E) ratio of the condensing of tobacco end filtration fraction and mouth end filtration fraction-retentivity is 1-2;

F) the air gas permeability of cigarette paper is a 40-100 Coresta unit; And

G) the filter tip air penetrability is 5-60%.

2. the cigarette with filter tip of claim 1 is characterized in that, the thin paper of tobacco end filtration fraction contains the levigate activated carbon powder of 30% (weight).

3. claim 1 or 2 cigarette with filter tip is characterized in that the part of the tobacco end of filter tip is a kind of core filter tip, and its core is by constituting by the carbon containing thin paper one of in the aforesaid right requirement, and this filter core is with the material parcel of saturating main plume hardly.