Tobacco – Tobacco or tobacco substitute product or component part thereof – Cigar or cigarette
Patent
1994-08-01
1995-03-07
Grieb, William H.
Tobacco
Tobacco or tobacco substitute product or component part thereof
Cigar or cigarette
131336, A24D 104
Patent
active
053948955
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a tipping paper used for a cigarette, with which the variation in the amount of air flow from the vented filter (filter ventilation) can be reduced, and to a cigarette using such a tipping paper.
DESCRIPTION OF THE PRIOR ART
A conventional cigarette filter is made of a fiber filter material such as cellulose diacetate wrapped by a plug wrap paper to form a cylindrical shape. A tipping paper is used for connecting the filter rod and a tobacco rod. Recently, vented filters each made by combining an air-permeable plug wrap paper and a tipping paper having pores or perforations formed by means of static electricity, laser, etc. with each other, are widely used to reduce the yield of smoke effusing through the filter rod by allowing air to enter through the periphery of the filter. With the vented filter having the above-described structure, dilution air drawn into the filter is inhaled into the smoker's mouth from the outer portion of the mouth end face of the filter, whereas tobacco smoke is inhaled into the mouth from the center portion of the mouth end face.
However, the conventional vented filter cigarette generally entails the problem of a large variation in filter ventilation even though the filter material, plug wrap paper, and tipping paper of the cigarette are the same, respectively. Since the filter ventilation and the amount of smoke inhaled are strongly correlated, the variation of the filter ventilation should be suppressed as much as possible.
The present invention has been proposed to solve the above-described problem, and the purpose thereof is to provide a cigarette which can surely control its filter ventilation.
SUMMARY OF THE INVENTION
In order to achieve the above-mentioned purpose, the authors of the present invention researched intensively about the variation in filter ventilation of the vented filter cigarettes. The inventors conducted a variety of tests on the filter ventilation, the following results were obtained. The degree of the variation is correlated to the tightness between the plug wrap paper (or the circumference surface of the filter, in the case where no plug wrap paper is used) and the tipping paper, rather than the variation in permeability of the materials. Depending on the degree of the tightness, the ventilation area of the plug wrap paper through which the dilution air passes differs from one product to another. As a result, the filter ventilation cannot be uniformly controlled even if the same material is used.
In consideration of the above results of the research, the inventors further carried out a number of tests, and discovered that the filter ventilation can be increased, and the variation therein can be reduced by separating vent zone of the tipping paper from the plug wrap paper of the filter by means of an embossment formed around the vent zone of the tipping paper.
According to the first aspect of the invention, there is provided a tipping paper to be used in combination with a filter having a highly permeable circumferential surface to produce a vented filter cigarette, the tipping paper includes a plurality of pores or perforations, and an embossment formed in the region including the vent zone.
Further, according to the second aspect of the invention, there is provided a vented filter cigarette produced by combining a filter having a highly permeable circumferential surface and a tipping paper having a plurality of pores or perforations, the vented filter cigarette having an embossment on the tipping paper in the region including the vent zone.
The present invention is characterized by the above-described structure in which the embossment provides a slight gap between the tipping paper and the circumferential surface of the filter around the area including the vent zone. With this gap, the tightness between the tipping paper and the circumferential surface of the filter is loosened, thereby increasing ventilation of air from the vented portion of the filter, and decreasing the variation in the
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Futamura Yasuyuki
Muramatsu Motohiko
Sagawa Takayoshi
Takeda Kazuko
Grieb William H.
Japan Tobacco Inc.
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