Method and an arrangement for the heat-sealing of packing...

Details Method and an arrangement for the heat-sealing of packing... Method and an arrangement for the heat-sealing of packing...

B - Operations, Transporting

29

C

154/29.04

B29C 65/02 (2006.01)

Patent

CA 1211356

ABSTRACT OF THE DISCLOSURE In the manufacture of non-returnable packages for milk and other beverages laminated packing material is seal- ed to itself along linear sealing zones by causing outer thermoplastic layers of the packing material to fuse together. The strength of the seal obtained depends upon the thermo- plastic surfaces being free of impurities, e.g., oxide coat- ings or residues of the contents of the package. In spite of the presence of impurities a strong seal can be obtained if the thermoplastic layers, within a limited region of the seal- ing zone, are pressed against each other with such a force that molten thermoplastic material is made to flow to adjoin- ing regions, since in this case the thermoplastics are blend- ed to such a degree that the seal-preventing layer of impuri- ties is broken.

419047

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