Method of producing a laminate material

US6893529B1 · kind B1 · utility

Assignee

• Tetra Laval Holdings & Finance S.A. · CH

Inventors

• Peter Öhman · Enebyberg, SE
• Rolf Lasson · Lund, SE

Key dates

• Filing date: Sep 27, 1996
• Grant date: May 17, 2005
• Expiry date: Sep 27, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2009/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

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 (10a) of plastic, and a second web (10b) 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 (10). In order to improve the adhesion between the webs (10a and 10b), 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 (20 and 21) which are of different hardnesses, the relatively softer roller (20) being disposed to be movable in relation to the relatively harder roller (21) in such a manner that the nip between the rollers (20 and 21) 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 har…