Method for sealing plastic sheets

Details Method for sealing plastic sheets Method for sealing plastic sheets

1978-01-03

1979-01-23

Wityshyn, Michael G.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

93DIG1, 156218, 156273, 156380, 156581, 219 1053, 219 1081, B29C 2704, B29D 2310

Patent

active

041359577

ABSTRACT:
A method and apparatus are disclosed for sealing flexible plastic sheets together. The method is performed by use of a die wherein a pair of longitudinal grooves are provided at the edge of the sealing area. The die is connected to a source of radio frequency energy and the sheets are placed between the die faces to effect the seal. Due to the provision of the grooves the sealing is effected without the extrusion of material into the space between the sheets thereby to produce a stronger and more satisfactory bond.

REFERENCES:
patent: RE27759 (1973-09-01), Leimert
patent: 2631646 (1953-03-01), Gannon et al.
patent: 3236174 (1966-02-01), Hutchinson et al.
patent: 3528876 (1970-09-01), Von Claue-Bouhaben et al.
patent: 3791908 (1974-02-01), Gidge
patent: 3809596 (1974-05-01), Gidge
patent: 3817816 (1974-06-01), Watt
patent: 3826702 (1974-07-01), Chapman
patent: 3960636 (1976-06-01), Moffitt
patent: 3986914 (1976-10-01), Howard

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