Cutting and sealing process for thermoplastic materials

Details Cutting and sealing process for thermoplastic materials Cutting and sealing process for thermoplastic materials

B - Operations, Transporting

26

D

164/18, 164/64

B26D 1/00 (2006.01) B29C 65/02 (2006.01) B29C 65/22 (2006.01) B29C 65/74 (2006.01)

Patent

CA 1202877

Abstract of the Invention A method for reducing wax build-up on sealing equipment where a heated element, such as a hot wire, cuts through and seals adjacent layers of a film or sheet of thermoplastic material containing thickened thermoplastic sections. The wax build-up is related to the contact between the wire and the thermoplastic material. The improvement results from a proper shaping of the wire, by regulating the height of wire elevation with respect to the film and thickened sections, by using a wire having a generally elongated cross-sectional shape, and by employing relatively high wire travel speeds whereby it is possible to take advantage of the shrink back characteristics resulting from the orientation built into the thermoplastic material, so that minimum contact between the wire and the thermoplastic material is realized.

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