Heat sealing of thread to a web

Details Heat sealing of thread to a web Heat sealing of thread to a web

B - Operations, Transporting

29

C

B29C 65/18 (2006.01) B31D 1/02 (2006.01) B65B 29/04 (2006.01)

Patent

CA 2144755

A tagged packet carries a tag (T) which is attached to the main body (B) of the packet by a thread (S). The thread comprised polypropylene so as to be attachable by heat sealing to the body. The body is made up of layers of sheet material also comprising thermoplastic material to allow the body to be closed by heat seals. The thread is secured to the face of the body at one edge at the same time as that edge is heat sealed and the heating for the thread seal is applied from the opposite face of the body whereas the adjacent regions of edge seal spaced from the thread has the heating applied through the first face. This arrangement gives closer control of the different conditions required for securing the thread and for seal- ing together only the sheet material of the body.

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