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1. (WO1984004486) METHOD AND MEANS FOR JOINING AND SEALING OF MATERIAL PARTS AND USE OF SUCH MEANS IN CONTAINERS

Pub. No.:    WO/1984/004486    International Application No.:    PCT/SE1984/000183
Publication Date: Nov 22, 1984 International Filing Date: May 15, 1984
IPC: B29C 65/50
B31F 5/06
C09J 5/06
G01R 31/36
Applicants:
Inventors:
Title: METHOD AND MEANS FOR JOINING AND SEALING OF MATERIAL PARTS AND USE OF SUCH MEANS IN CONTAINERS
Abstract:
A method and a means for joining and sealing of material parts, and use of such a means, in particular for joining and sealing of parts of containers of cardboard or a similar material in which a joining piece (5) comprising a laminate of a heat receiving and heat conducting layer of material (1) and on one or both sides thereof a heat adhesive or heat weldable layer (2) is put with the heat adhesive or the weldable layer (22) to the material parts (3, 4) to be joined or sealed and is pressed with a predetermined pressure to said parts, whereupon the joining piece (5) is subjected to high frequence or ultrasonic energy of such intensity and duration that the heat receiving and heat conducting layer of material (1) provides a softening or melting the adhesive or weldable layer or layers (2) of material, whereby the joining piece (5) and the material parts (3, 4) are joined. The connection piece may be a triple laminate consisting of an intermediate layer (1) of a conductive material and on both sides thereof a weldable layer, and the material of the conductive layer may be any metal like aluminum, whereas the weldable layer or layers may be a synthetic resin.