Tobacco – Tobacco or tobacco substitute product or component part thereof – Cigar or cigarette
Reexamination Certificate
1998-10-05
2001-03-20
Silverman, Stanley S. (Department: 1731)
Tobacco
Tobacco or tobacco substitute product or component part thereof
Cigar or cigarette
C131S335000, C131S336000, C131S341000, C131S344000, C493S047000, C055S483000
Reexamination Certificate
active
06202650
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a filter-tipped cigarette, and a filter for a cigarette, and more particularly to a filter-tipped cigarette having a filter body composed of a plurality of filter plug sections, and such a filter for a cigarette.
Recently, a tendency of favoring mild tobacco taste for tobacco products such as a cigarette has become increasingly stronger. To obtain mild tobacco taste, techniques of expanding cut tobacco for a cigarette to make the flavor or taste milder, and fitting a filter to the end of tobacco column of a cigarette are used.
In the technique of fitting the filter, in order to make tobacco flavor and taste still milder, it has been a practice that a filter body is composed of a plurality of filter plug sections, such as a so-called dual-filter, and activated carbon or the like is dispersed into the filter plug section arranged at a position away from a mouth end portion. In addition, many ventilation holes are circumferentially made in a so-called tip paper for connecting the filter body to the tobacco column. The taste of the cigarette can be made milder by ambient air sucked through the ventilation holes when smoked. Furthermore, as a filter wrapper for rolling or wrapping a filter body, paper having a higher air permeability is also used.
However, in the technique of making tobacco flavor mild by using the ventilation holes, it is necessary to make a larger number of the ventilation holes (for example, to increase lines of the ventilation holes) in order to make the tobacco flavor still milder. This is not preferable from the viewpoint of the external appearance of the cigarette, and presents a limited ventilation amount. When, for example, 4 lines of ventilation holes are made in the tip paper, the ventilation amount which can be accomplished by means of a filter wrapper having an air permeability of 10000 CORESTA units is at most 70%.
On the other hand, the filter wrapper is more expensive as its air permeability is higher, and thus, use of a filter wrapper having an air permeability higher than necessary is not economical.
BRIEF SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a filter-tipped cigarette having a plurality of filter plug sections as well as such a filter wherein the external appearance of its filter tip is not damaged, and a high ventilation amount can be obtained without use of an expensive filter wrapper having an air permeability higher than necessary.
To accomplish the object, the present invention provides a certain filter portion having a plurality of filter plug sections each wrapped individually by individual filter plug wrappers. These individually wrapped filter plug sections are integrally wrapped by an integral filter wrapper. Such a filter portion is connected to a tobacco portion by a tip paper having ventilation holes perforated therein. Of the individual filter plug wrappers, that individual filter plug wrapper which corresponds to the ventilation holes made in the tip paper is constituted by a low air-permeability paper, and an integral filter wrapper integrally wrapping the filter plug sections wrapped with the individual filter plug wrappers is constituted by a high air-permeability paper.
Accordingly, the present invention provides a filter-tipped cigarette comprising a tobacco portion having a tobacco material wrapped by a cigarette paper, and a filter portion which is connected to one end of the tobacco portion;
the filter portion having a filter body composed of a plurality of individual filter plug sections, a plurality of individual filter plug wrapper wrapping the respective filter plug sections and an integral filter wrapper integrally wrapping the plurality of filter plug sections wrapped by the individual filter plug wrappers,
the tobacco portion and the filter portion being integrally connected by means of a tip paper which entirely covers the integral filter wrapper, and covers the proximal end portion of the cigarette paper,
the tip paper having a plurality of ventilation holes along the circumference direction of the tip paper and at a position away from a smoking end of the filter portion,
the individual filter plug wrapper, that corresponds to the ventilation holes, having an air permeability lower than the integral filter wrapper.
Preferably, the individual filter plug wrapper corresponding to the ventilation holes has an air permeability of about one-third or less (⅓ or less) of that of the integral filter wrapper. Also, preferably, the integral filter wrapper has an air permeability of 30,000 CORESTA units or more.
Further, it is preferred that the air permeability of the individual filter plug wrapper corresponding to the ventilation holes be from 1,800 to 20,000 CORESTA units and/or that a ventilation amount (air inflow amount) through the ventilation holes is 50% or more.
Furthermore, the present invention provides a filter for a cigarette which is to be used in combination with a tip paper having a plurality of ventilation holes made therein, the filter comprising a filter body composed of a plurality of individual filter plug sections, a plurality of individual filter plug wrappers wrapping the respective filter plug sections and an integral filter wrapper integrally wrapping the filter plug sections wrapped by the individual filter plug wrappers,
the individual filter plug wrapper, which is to correspond to the ventilation holes, having an air permeability lower than the integral filter wrapper.
In this filter, too, it is preferred that the individual filter plug wrapper which is to correspond to the ventilation holes has an air permeability of about one-third or less of that of the integral filter wrapper. Also, preferably, the integral filter wrapper has an air permeability of 30,000 CORESTA units or more. Further, it is preferred that the air permeability of the individual filter plug wrapper which is to correspond to the ventilation holes be from 1,800 to 20,000 CORESTA units.
Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter.
REFERENCES:
patent: 4942887 (1990-07-01), Abdelgawad et al.
patent: 5464028 (1995-11-01), Takeda et al.
patent: 5568819 (1996-10-01), Gentry et al.
patent: 0295835A1 (1988-12-01), None
patent: 0532329A2 (1993-03-01), None
patent: 0636324A1 (1995-02-01), None
patent: 0797931A1 (1997-10-01), None
patent: 2100573A (1983-01-01), None
patent: 10-004944A (1998-01-01), None
Kaneki Kazuyo
Komatsubara Osamu
Miura Keigo
Birch & Stewart Kolasch & Birch, LLP
Halpern Mark
Japan Tobacco Inc.
Silverman Stanley S.
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