JP2009526540A5 - - Google Patents

Description

The present invention includes a filter for smoking articles having at least two different sections. The first section includes an inner region and a surrounding region, which region includes a smoke channel and a region of material that is relatively impermeable to smoke. This material, which is relatively impervious to smoke, has a greater resistance when compared to the smoke flow resistance of the smoke flow path. In one embodiment, relatively impermeable material to the smoke flow path and the smoke is placed in the core and ring structures by the smoke flow path forming the core. In another aspect, the smoke flow path forms an annular structure and the material that is relatively impermeable to smoke forms the core of the first section.

In another aspect, the present invention includes a vent hole surrounding a second section or space or gap between the first and second sections. As the cigarette is smoked, the smoke passage of the first section begins to concentrate in the smoke passage and begins to fill with the particulate smoke component that accumulates, and the smoke flow through the passage begins to be restricted. This limitation increases the pressure drop in the first section. As the pressure drop increases, more air enters the filter through the ventilation holes, which causes smoking to progress in subsequent puffs, and the known phenomenon of increased smoke component delivery in the second half of the smoking article. It will reduce the variation in smoke component delivery in subsequent puffs that would occur as smoking progresses.

The invention further provides a smoking material rod, a smoking article comprising a filter that by the present invention which is attached to the wrapper and smoking material rod surrounding it.

The first section of the filter according to the present invention, the first end thereof to the rod of smokable material of the smoking article is adjacent, preferably away from the second section of the filter at the opposite end.

The smoke flow path 4 can take many different forms. For example, the smoke flow path 4 can be made of a material having a lower pressure drop than the surrounding region 6 as shown in FIG. 3 , such as a cellulose acetate, as shown in FIG.

Referring again to FIG. 1, the filter 1 further includes an axially arranged second section 8 that includes a core 10 surrounded by an annular portion 12. The core 10 inside the second section 8 is axially aligned with the inner region 4 of the first section 2. As more clearly shown in FIG. 2, the filter 1 further includes a space or gap 14 located between the first section and the second section 8. The length of the gap 14 may be in the range of 0.0001 mm to 4 mm, but in various embodiments of the present invention, the range of 0.1 to 3.8 mm, the range of 0.5 to 3.5 mm, It may be in the range of 1 to 3 mm, or in the range of 1.5 to 2.5 mm, and in one particular embodiment of the invention is about 2 mm. If this gap is too wide, the heavy smoke component will be dispersed in the gap between the first and second filter sections before impinging on the second section 8 and will negatively affect the performance of the filter 1. The gap 14 along with the rest of the filter 1 is wrapped with plug paper and attached to the rest of the cigarette with conventional tipping paper.

When the smoke passage of the first section 2 is the surrounding area 6, the collision area of the second section 8 is in the area of the annular portion 12. This can be an annular portion 12 made of a relatively impermeable material along the entire length of the second section 8 as shown in FIGS. 1 to 3, or a normal filter section as shown in FIG. It is also possible to have an annular disc 36 made of the same material attached to the end of 34.

In one aspect, the filter 1 includes ventilation holes 20 that are located in either the second section 8 or the gap 14.

The method of reducing the second bandwidth uses a ventilation hole. When the cigarette is smoked, the tube 4 of the first section 2 is gradually filled with the particulate smoke component, making it difficult for the smoke to flow through the tube 4. This increases the pressure drop through the first section 2 and more diluted air is taken in through the ventilation holes 20 as the smoker smokes. Dilution air enters the gap 14 or the second section 8 through ventilation holes 2 0 surrounding the second section 8 or between gap 14. This further concentrates the smoke in the center of the gap 14, thereby causing most of the smoke to impinge on the wick 10, which in the preferred embodiment includes the impact area of the second section 8.

Claims (15)

A first section comprising smoke impermeable material having a longitudinally extending smoke flow path;
A second section separated from the first section by a hollow gap and including a core portion axially aligned with the first section and surrounded by an annular portion;
A filter for a smoking article comprising the second section or a ventilation hole provided in the gap,
Either one of the core portion and the annular portion includes a high pressure drop material, and the other includes a low pressure drop material,
The smoke flow path is axially aligned with the annular portion or core including the high pressure drop material ; and
The filter for smoking articles, wherein the first section and the second section are separated by 2 mm or less . A first section comprising smoke impermeable material having a longitudinally extending smoke flow path;
A smoking article filter comprising a second section separated from the first section by a hollow gap and axially aligned with the first section and comprising a mouth end and a gap end.
A ventilation hole is provided in the second section or gap,
A smoke-impermeable block patch is attached to the gap-side end of the second section;
The smoke flow path is longitudinally aligned with respect to the block patch ;
The filter for smoking articles, wherein the first section and the second section are separated by 2 mm or less . Smoking article filter according to claim 1 or 2, wherein the said smoke flow path is an opening centrally disposed in the first section. The smoking article filter according to claim 3, wherein the smoke flow path includes a tube therein. Claim 1 or 2 smoking article filter according the smoke flow path, characterized in that it comprises a lower-pressure drop of the material the smoke impermeable material. The smoking article filter according to claim 5, wherein the low pressure drop material is disposed in the center of the first section. The smoking article filter according to claim 5, wherein the low pressure drop material surrounds the smoke-impermeable material in a ring / core relationship. Smoking article filter according to claim 1 or 2, wherein the ventilation hole is equal to or surrounding the second section. The smoking article filter according to claim 1 or 2, wherein the ventilation hole is located between the first section and the second section. 3. The smoking article filter according to claim 1, wherein the ventilation hole allows outside air to flow into the filter. 5. The smoking article filter of claim 4 , wherein the amount of air drawn through the ventilation holes increases as the tube is filled with tar. The smoking article filter according to claim 1 or 2, wherein the smoke channel has a length of 5 to 10 mm. The filter for smoking articles according to claim 1 or 2, wherein the smoke channel has a diameter of 0.5 to 3 mm. The smoking article filter according to claim 1 or 2, wherein the diameter of the core of the second section is about 60% of the diameter of the filter. A smoking rod,
A wrapper that wraps this smoking rod,
A smoking article comprising the filter according to any one of claims 1 to 14 ,
A first section of the filter has a first end and an opposite end thereof, the first end is attached to the smoking material rod, and a second section of the filter is connected to the first section by the hollow gap. apart down or al and aligned on the opposite ends in the axial direction of the first section, further smoking article said first section and said second section is characterized that you have away 2mm or less.