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Tobacco Smoke Filter and Methods of Making the Same

Inactive Publication Date: 2010-06-17
BRITISH AMERICAN TOBACCO (INVESTMENTS) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]In accordance with the present invention, there is provided a smoke filter for a tobacco product comprising an axially extending filter section defining a path along which, in use, smoke passes through filtration material, wherein the path extends helically around the axis of the filter. By providing a smoke path that thus winds around the axis of the filter, the contact time of the smoke with the filtration material and the surface area of filtration material contacted may be increased.
[0015]In one embodiment, the filtration means occupies substantially all of the space between the helical element and the inner diameter of the enclosure. This ensures that the smoke flowing along the helical element must pass through the filtration means, thereby providing good filtration behaviour. In addition, tight packing of the filtration means within the filter imparts a solid and reassuring feel to the filter. This tight packing can be achieved by using small fibres or such-like of filtration materials.

Problems solved by technology

One challenge faced with the addition of granular or particulate material to the filter filaments is how to adhere the individual particles in such a way that they remain active.
One solution has been to form cavities in the filter and load them with batches of particles, although that presents a different problem, namely, how to channel the smoke stream through such a loose bed of particles during use.

Method used

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  • Tobacco Smoke Filter and Methods of Making the Same
  • Tobacco Smoke Filter and Methods of Making the Same
  • Tobacco Smoke Filter and Methods of Making the Same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065 Filter Manufacture

[0066]Activated carbon is moulded into a helical shape approximately 6 mm in diameter. An average pitch and low porosity, i.e., low permeability, are used. The carbon is cut into lengths of approximately 20 mm. Units of standard cellulose acetate tow approximately 6 mm in diameter and approximately 10 mm long are provided and arranged in alternating fashion with lengths of carbon helix.

[0067]The intra helical space of the carbon helix is provided with a mixture of flavourant and adsorbent before the length of helix / cellulose acetate tow is wrapped with an approximately 0.5 mm thick layer of cellulose acetate about its circumference. Plug wrap may optionally be provided around the cellulose acetate layer as known in the art.

[0068]This provides a length of filter material which may be cut along the middle of the approximately 10 mm lengths of cellulose acetate tow to provide a plurality of filter units each approximately 30 mm in length and each comprising an a...

example 2

[0070 Cigarette Manufacture

[0071]A resin commonly used in tobacco smoke filters is extruded through a die to produce a tight helical shape approximately 7 mm in diameter and 10 meters long. The shape is fed into a machine which applies suction or vacuum, for example a suction garniture, to pack fibres of cellulose acetate around the helix. The packed helix is wrapped in plug wrap and cured on a drying garniture. The cured filter is cut to 60 mm lengths which are provided to a cigarette making machine.

[0072]The cigarette making machine uses the filter to produce cigarettes according to known methods. In brief, two tobacco rods are positioned at either end of the filter and, once secured, the filter is cut at the middle. An optional end segment, for example, a pad of cellulose acetate, is added at the mouth end of the cigarette to mask the helical core unit. The resultant product is a cigarette incorporating a novel tobacco smoke filter according to the invention.

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PUM

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Abstract

A tobacco smoke filter (10) can comprise a spiral core (11) of impermeable or semi-permeable material. A filter spiral core (11) is surrounded by filter material (12) such as cellulose acetate and wrapped in paper (13).

Description

FIELD OF THE INVENTION[0001]The invention relates generally to devices for filtration of tobacco smoke, their manufacture and use. More specifically, the invention relates to filters suitable for use in smoking devices.BACKGROUND OF THE INVENTION[0002]Single-use, disposable filters have been incorporated in smoking products for decades. Filters are commonly made of cellulose acetate, relying on a process whereby cellulose acetate is dissolved in a solvent such as acetone, and polymer filaments are spun out of the solution. The filaments are lubricated and bundled, then crimped and dried. Alternative filter materials include polypropylene and cellulose. Filters may be segmented, potentially with different materials in different segments; they may incorporate granular additives such as carbon.[0003]The filter is located at one end of the tobacco rod so that smoke from the burning tobacco rod, which comprises a particle phase and a vapour phase, passes through the filter before being i...

Claims

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Application Information

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IPC IPC(8): A24D3/06A24D3/04
CPCA24D3/045A24D3/0225A24D3/0245
Inventor FALLON, GARY
Owner BRITISH AMERICAN TOBACCO (INVESTMENTS) LTD
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