Method of and apparatus for treating webs of wrapping material
First Claim
1. A method of treating a laminate including a web having a first side and a second side, and a film of an inactivatable adhesive at least partially coating at least one side of the web, comprising the steps of:
- severing at least one first portion of the laminate; and
inactivating a portion of the inactivatable adhesive, the portion of the inactivatable adhesive forming part of at least one second portion of the laminate adjacent to the severed first portion, wherein the laminate is a strip consisting of coherent successive uniting bands adapted to attach rod sections of filter material for tobacco smoke to rod tobacco-containing products in a filter tipping machine.
1 Assignment
0 Petitions
Accused Products
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.
20 Citations
14 Claims
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1. A method of treating a laminate including a web having a first side and a second side, and a film of an inactivatable adhesive at least partially coating at least one side of the web, comprising the steps of:
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severing at least one first portion of the laminate; and
inactivating a portion of the inactivatable adhesive, the portion of the inactivatable adhesive forming part of at least one second portion of the laminate adjacent to the severed first portion, wherein the laminate is a strip consisting of coherent successive uniting bands adapted to attach rod sections of filter material for tobacco smoke to rod tobacco-containing products in a filter tipping machine. - View Dependent Claims (2, 3, 4, 5)
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6. A method of treating a laminate including a web having a first side and a second side, and a film of an inactivatable adhesive at least partially coating at least one side of the web, comprising the steps of:
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providing the web with a plurality of perforations, each perforation corresponding to a first portion of the laminate and being surrounded by inactivatable adhesive; and
inactivating a portion of the inactivatable adhesive, the portion of the inactivatable adhesive forming part of at least one second portion of the laminate adjacent to the perforated first portion, said inactivatable step including inactivating the adhesive around at least some of the perforations. - View Dependent Claims (7)
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8. A method of treating a laminate including a web having a first side and a second side, and a film of an inactivatable adhesive at least partially coating at least one side of the web, comprising the steps of:
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severing at least one first portion of the laminate; and
inactivating a portion of the inactivatable adhesive, the portion of the inactivatable adhesive forming part of at least one second portion of the laminate adjacent to the severed first portion, wherein the adhesive is inactivatable in response to coherent radiation, said inactivating step comprising subjecting the portion of the adhesive forming part of at least one second portion of the laminate to the action of said radiation.
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9. A method of treating a laminate including a web having a first side and a second side, and a film of an inactivatable adhesive at least partially coating at least one side of the web, comprising the steps of:
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severing at least one first portion of the laminate; and
inactivating a portion of the inactivatable adhesive, the portion of the inactivatable adhesive forming part of at least one second portion of the laminate adjacent to the severed first portion, wherein the adhesive contains a solvent which is evaporable in response to the action of coherent radiation to thus inactivate the corresponding part of the film, said inactivating step including subjecting the solvent in the portion of the adhesive forming part of said at least one second portion of the laminate to the action of coherent radiation.
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10. A method of treating a laminate including a web having a first side and a second side, and a film of an inactivatable adhesive at least partially coating at least one side of the web, comprising the steps of:
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severing at least one first portion of the laminate; and
inactivating a portion of the inactivatable adhesive, the portion of the inactivatable adhesive forming part of at least one second portion of the laminate adjacent to the severed first portion, wherein said adhesive is inactivatable in response to exposure to coherent radiation and said severing step comprises establishing a source of coherent radiation, directing from said source a first portion of at least one beam of coherent radiation against predetermined sections of said at least one first portion of the laminate to thus provide the laminate with a plurality of perforations, each of which is surrounded by adhesive, as well as with a plurality of elongated cuts dividing the laminate into a plurality of discrete bands, said inactivating step comprising directing a second portion of said at least one beam against the adhesive surrounding the perforations so that the perforations are surrounded by inactivated adhesive.
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11. An apparatus for treating a laminate including a web having a first side and a second side, and a film of inactivatable adhesive at least partially coating at least one side of the web, comprising:
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means for severing at least one area of the laminate; and
means for inactivating at least a portion of the inactivatable adhesive film adjacent to said at least one area of the laminate, wherein at least one of said severing and inactivating means includes at least one source of coherent radiation, and means for directing at least one beam of coherent radiation from said at least one source against the laminate, said means for directing including a diffractive optical element arranged to direct a higher-intensity portion of the at least one beam against the laminate to thus sever the laminate, and to direct a lower-intensity portion of the at least one beam against the film of adhesive. - View Dependent Claims (12, 13, 14)
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Specification