Method of and apparatus for treating webs of wrapping material

US6325068A · kind A · utility

Assignee

• HAUNI MASCHINENBAU GMBH · DE

Inventors

• Manfred Dombek · Dassendorf, DE
• Helmut Voss · Hamburg, DE

Key dates

• Filing date: Jun 4, 1999
• Grant date: Dec 4, 2001
• Expiry date: Jun 4, 2019

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A24C5/007
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

An elongated strip of tipping paper is advanced in a tipping machine for the making of filter cigarettes. The strip advances past a perforating unit and thereupon past a cutting unit which subdivides the perforated strip into a series of uniting bands ready to be convoluted around abutting ends of plain cigarettes and filter rod sections. One side of the strip is coated with a film of an adhesive which can be inactivated by exposing it to coherent radiation. The perforating and cutting steps are carried out by one or two beams of coherent radiation which can further serve to inactivate the adhesive around each perforation and along the edges which extend across the strip to thus reduce the likelihood of penetration of active adhesive into the perforations and/or a contamination of the products by active adhesive being expelled beyond the marginal portions of the uniting bands. A single source can suffice to furnish coherent radiation for the carrying out of the perforating, cutting and inactivating operations.