The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 2005
Filed:
Sep. 27, 1996
Peter Öhman, Lund, SE;
Rolf Lasson, Lund, SE;
Peter Öhman, Lund, SE;
Rolf Lasson, Lund, SE;
Tetra Laval Holdings & Finance S.A., Pully, CH;
Abstract
The disclosure relates to a method of producing a well-integrated laminate material, for example a packaging laminate, in which method a first web () of plastic, and a second web () of plastic are brought together and permanently united to one another by the simultaneous application of heat and pressure, for the formation of the laminate material (). In order to improve the adhesion between the webs (and), these are subjected to a surface-activating treatment of non-chemical nature, preferably a corona treatment, prior to the uniting of the webs, whereby good adhesion and bonding between the webs is achieved without the employment of interjacent chemical adhesives. The method is preferably reduced into practice employing rollers (and) which are of different hardnesses, the relatively softer roller () being disposed to be movable in relation to the relatively harder roller () in such a manner that the nip between the rollers (and) through which both of the united webs are led may be adjusted at a suitable pressure, and that the nip obtains a certain width or extent in the linear direction of the webs as a result of the penetration of the relatively harder roller () into the surface of the compressing, relatively softer roller ().