Packaging laminate, method of producing a packaging container and the packaging container

Abstract

Method in connection with the production of a packaging container, including a) choosing or manufacturing a web shaped packaging laminate according to claim 1, b) converting said packaging laminate to a continuous tube by overlapping two longitudinal edges of the web shaped packaging laminate and heat sealing the overlapped edges to provide a longitudinal seal, c) filling the tube with contents, d) intermittently performing transversal seals by mechanically pressing together two transversal anvil jaws while the filled tube is arranged there between, e) while at the same time providing energy to the packaging laminate at an area of said transversal seal.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of U.S. application Ser. No. 10 / 471,565, filed Mar. 22, 2004, the contents of which are incorporated herein by reference, which was the National Stage filing under §371 of International Application No. PCT / SE02 / 00436 filed Mar. 11, 2002, which in turn claims priority to Swedish Application No. 0100858-0, filed Mar. 12, 2001.TECHNICAL FIELD [0002] This invention relates to a packaging laminate for a packaging container, preferably for liquid food contents, which packaging laminate comprises a structural base layer, and an inside layer. The invention also relates to a method of producing a packaging container from the packaging laminate, and to the packaging container built up from the packaging laminate. PRIOR ART AND PROBLEMS [0003] Food packaging processes of today (with the term “food” is meant all sorts of solid and liquid food, such as juices, milk and other beverages as well as pastes, soups, jellie...

AI Technical Summary

Benefits of technology

The present invention provides a packaging laminate that is more forgiving and can adapt to poor conditions during sealing, such as poor tolerances in the sealing machine, poor tube guiding, disturbed movements of the anvil jaws, and foreign matter. The laminate has an inside layer that is a heat sealable thermoplastic material with lower melt enthalpy than the outermost ply, which allows for a strong and liquid-tight seal to be formed even in the event of poor mechanical settings. The laminate is also well-adapted for use in packaging containers for food. The sealing laminate can be used in ultrasonic vibration heat sealing, where the entire material under pressure between the ultrasonic horn and the anvil jaw is heated up by the vibrations at the same time.

Problems solved by technology

Especially, the object is to provide a packaging laminate which is more forgiving to prevailing circumstances such as poor tolerances in the mechanical settings of the sealing machine, poor tube guiding, disturbed movements of the anvil jaws, poor parallelism between the ultrasonic horns and the cutting rails, presence of foreign matter in the area of the seals, etc.

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