Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With cutting – punching – piercing – severing – or tearing
Patent
1972-03-31
1978-07-18
Drummond, Douglas J.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With cutting, punching, piercing, severing, or tearing
156583, B32B 3100, B30B 1534
Patent
active
041013697
ABSTRACT:
Thermoplastic web treating apparatus, particularly adapted for the fabrication of flexible bags and comprising, in combination, a web treating station along with means for intermittently advancing webs through the station. The treating station includes thermal welding or sealing apparatus with a welding bar and sealing pad combination for forming spaced seals in the web, and a cutting blade for cutting or shearing the web. The apparatus is designed to provide tension during cutting operations, and to eliminate tension prior to and during sealing operations to permit "relaxation" of the film prior to formation of the seal, as well as to break away any bond which may form between the thermoplastic web and the sealing pad from the sealing operation. This break-away of the bond is accomplished through an initial short duration reversal of the web draw rolls prior to each web advance.
REFERENCES:
patent: 3053723 (1962-09-01), Plach et al.
patent: 3060075 (1962-10-01), Kincaid
patent: 3257256 (1966-06-01), Lehmacher et al.
patent: 3663338 (1972-05-01), Wech
Drummond Douglas J.
G. T. Schjeldahl Company
Haugen Orrin M.
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