Cutting and sealing process for thermoplastic materials

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

1981-10-13

1983-08-02

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156515, B32B 3118

Patent

active

043964494

ABSTRACT:
A method for reducing wax build-up on a sealing equipment where a heated element, such as a hot wire, cuts through and seals adjacent layers of thermoplastic material containing thickened thermoplastic sections. The wax build-up is related to the contact between the cutting and sealing wire and the thermoplastic material. The improvement results from a proper shaping of the cutting and sealing wire, by regulating the rising height and profiling of the wire through the film and thickened sections, and by employing relatively high wire travel speeds whereby it is possible to take advantage of the shrink back characteristics resulting from the orientation already built into the thermoplastic material, so that minimum contact between the wire and the thermoplastic material is realized.

REFERENCES:
patent: 3574039 (1971-04-01), Fehr et al.
patent: 4319952 (1982-05-01), Schjeldahl

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