Apparatus for perforating webs of wrapping material for tobacco

Details Apparatus for perforating webs of wrapping material for tobacco Apparatus for perforating webs of wrapping material for tobacco

1981-08-20

1984-09-04

Millin, Vincent

Tobacco

Cigar or cigarette making

Including perforating

A24C 500, A24C 560

Patent

active

044691114

ABSTRACT:
Apparatus for making holes in a running web of tipping paper for filter cigarettes has a carrier for a battery of suitably distributed perforating units each of which has an optical system for focusing upon the running web a discrete beam of coherent radiation which is furnished by a laser. The making of holes entails the development of contaminants, and such contaminants are removed by air streams which are circulated through the perforating units not only to remove the contaminants but also to cool the optical systems of the respective perforating units. The web advances along the convex side of a shroud which maintains the web at an optimum distance from the optical systems of the perforating units. The shroud is installed between the web and the perforating units and has elongated slot-shaped apertures for the beams of radiation. The perforating units form several rows, and the shroud has or can have one elongated aperture for each row of perforating units. Air streams are caused to flow along the concave side of the shroud as well as along the exposed side of the web in the region of the shroud; such air streams remove those contaminants which would tend to accumulate along the edges bounding the apertures of the shroud.

REFERENCES:
patent: 2763759 (1956-09-01), Mito et al.
patent: 3862396 (1975-01-01), Machida et al.
patent: 4040425 (1977-08-01), Goodling et al.
patent: 4207458 (1980-06-01), Lilly et al.
patent: 4219727 (1980-08-01), Bolt
patent: 4232574 (1980-11-01), Hall
patent: 4236062 (1980-11-01), Lilly et al.
patent: 4253010 (1981-02-01), Brown et al.

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