Method for t or butt sealing of laminated all-plastic material

Details Method for t or butt sealing of laminated all-plastic material Method for t or butt sealing of laminated all-plastic material

B - Operations, Transporting

31

F

18/972

B31F 7/00 (2006.01) B29C 65/02 (2006.01) B29C 65/10 (2006.01) B29C 67/00 (2006.01) B29C 35/04 (2006.01)

Patent

CA 1077666

ABSTRACT OF THE DISCLOSURE The present invention provides a method of improving, in the T or butt sealing of a laminated thermoplastic material of the type which comprises a carrier layer of porous plastic material and outer layers of compact plastic material, the strength of the seal by heat treatment of the edge surface at which the sealing is to be carried out, the said edge surface before the sealing being heated by a jet of hot air, whose main stream has a greater thickness than the carrier layer of the material and is directed substantially at right angles against the edge surface so as to provide before sealing, melting of the edge surface such that the carrier layer draws back and the two outer layers are melted toward ?ther and me? ??stantailly in the centre

268196

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