Low tar retention filter

A - Human Necessities – 24 – D

Patent

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Details

A24D 3/04 (2006.01)

Patent

CA 2502587

A tobacco smoke filter which has a tar retention of at most 50% and comprises a relatively high draw resistance downstream filtering plug (2) of at most 50% tar retention, a relatively low draw resistance upstream filter plug (3) of at most 22% tar retention spaced longitudinally upstream therefrom, and a filter wrapper (4) engaging around and joining the spaced plugs to define a cavity (6) therebetween.

L'invention concerne un filtre de cigarette à 50 % de rétention de goudron, comprenant un obturateur (2) de filtrage en aval présentant une résistance à l'aspiration relativement élevée, et jusqu'à 50 % de rétention de goudron, un obturateur (3) de filtrage en amont présentant une résistance à l'aspiration relativement faible, et jusqu'à 22 % de rétention de goudron, espacés longitudinalement en amont, et une enveloppe (4) de filtre entourant et venant en contact avec les obturateurs espacés pour définir une cavité (6) entre ceux-ci.

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