Method of and apparatus for increasing the permeability of wrappers of rod-shaped articles
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United States of America Patent
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Jan 13, 2004
Issued Date -
N/A
app pub date -
Feb 5, 2001
filing date -
Feb 4, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for increasing the permeabilities of central portions of tubular wrappers which form part of successive filter cigarettes of double unit length being turned out by a tipping machine. The central portions of the wrappers include adhesive-coated uniting bands which are convoluted around filter mouthpieces in a first portion of a rolling channel for successive filter cigarettes. A perforating unit which employs laser beams is set up to simultaneously perforate the central portions of the wrappers of several successive cigarettes in a second portion which immediately follows or partially overlaps the first portion of the channel. Each wrapper can be provided with two or more annular arrays of perforations.
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