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Filter for a smoking article

A technology for smoking products and filters, which is applied in the fields of e-liquid filter elements, tobacco, and applications, and can solve problems such as reduced suction power, unfavorable smoking experience, and smoke escape

Inactive Publication Date: 2011-06-22
BRITISH AMERICAN TOBACCO (INVESTMENTS) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the size of the perforations increases, then smoke can escape undesirably through these holes
Also, the amount of puff the consumer needs to apply is reduced, detrimental to the smoking experience

Method used

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  • Filter for a smoking article
  • Filter for a smoking article
  • Filter for a smoking article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Introduced herein is a filter for smoking articles configured to utilize the orifice effect to regulate the passage of smoke and the level of smoke filtration.

[0025] As used herein, a "high resistance segment" should be understood as a segment of material having a high ability to resist the passage of smoke. The material is also capable of effectively filtering undesirable components in smoke, for example by virtue of having a high density. The terms "high resistance segment", "high filtration efficiency material" and "high resistance material" are therefore to be understood as having conventional meanings. On the other hand, "low resistance segment", "low filtration efficiency material" and "low resistance material" and similar terms are used to indicate a low capacity (or no such capacity) to prevent the passage of smoke and a low capacity for filtering smoke. Efficient (or inefficient) segments (or pores) of material. When referring to these materials, the terms...

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PUM

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Abstract

The present invention relates to smoking articles incorporating an improved filter in which the amount of smoke filtration varies with increased strength of draw. In particular, the filter comprises a plurality of passageways, at least one primary passageway I comprising a section of material which extends from the rod of smokable material to the mouth end of the smoking article and which has a high capacity to filter smoke and a high capacity to resist the passage of smoke. Via a series of small holes in an otherwise non-porous interface between the different passageways, smoke may be drawn between the primary passageway I and one or more secondary passageways II which have a low capacity to filter and resist the passage of smoke. At lower strengths of draw, smoke may become drawn through the small holes between the primary and secondary passageways. At higher strengths of draw, however, the rate at which smoke may pass through the small holes is limited by the restricted orifice effect and in this way the level of filtration of the smoke at different strengths of draw may be controlled.

Description

technical field [0001] The present invention relates to a filter for a smoking article such as a cigarette. Background technique [0002] The smoke produced by the combustion of smoking articles consists of gaseous components and particulate matter commonly referred to as "tar". Various types of filter constructions are known in the art for removing undesirable components from smoke when a consumer smokes a smoking article. [0003] A number of different filter arrangements have been disclosed for smoking articles including composite filters, wherein the filter comprises a plurality of individual filter segments having different filtering capacities, and the filter is made of different materials such as cellulose acetate and Activated carbon particles. [0004] Measures aimed at reducing the levels of undesirable components in smoke inhaled by consumers often include diluting the smoke by introducing ambient air into the smoking article as the consumer smokes. The most co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A24D3/04
CPCA24D3/045A24D3/04A24D1/045A24D3/0295A24D3/067
Inventor R.费贝尔科恩
Owner BRITISH AMERICAN TOBACCO (INVESTMENTS) LTD