Importance

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Abstract

An improved tobacco smoke filter is characterized by an undiluted air passage formed between a smoke-impervious plug wrap and an air-impervious tipping wrap by loosely wrapping the tipping wrap about the plug wrap along a section of the filter extending from its smoke discharge end. In a preferred embodiment, the loose wrapping is effected by reducing the cross-sectional perimeter of the rod and plug wrap along the aforesaid section while keeping the tip of the cross-sectional perimeter substantially constant throughout its length. A raised lip is provided at the smoke discharging end of the rod and plug wrap to define a cigarette holder in the filter. For circumstances where the cross-section of the filter plug becomes too complex for adherence of the tipping paper, heat shrinkable film can be laminated in the tipping paper so that after the entire cigarette is assembled, it can be subjected to heat and cause the tipping paper to shrink to the appropriate size. In addition, particles of material which impart flavor to the smoke may be embedded into the plug wrap. Apparatus and method for manufacturing the filter as described are disclosed.

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First Claim