Apparatus for perforating webs of wrapping material for tobacco or the like

US4469111A · kind A · utility

Assignee

• Hauni-Werke Korber & Co. K.G. · DE

Inventors

• Peter Pinck · Bargteheide, DE
• Elke Kohler · Hamburg, DE

Key dates

• Filing date: Aug 20, 1981
• Grant date: Sep 4, 1984
• Expiry date: Aug 20, 2001

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K26/0665
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

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 th…