Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With stretching or tensioning means
Patent
1980-10-24
1982-03-09
Wityshyn, Michael G.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With stretching or tensioning means
156495, 156499, 156515, 493194, 493341, B32B 3118, B32B 3126
Patent
active
043187684
ABSTRACT:
Slit-sealing apparatus for high density plastic sheets is disclosed. The sheets to be slit-sealed are passed over rollers, at least one of the rollers having a brake so that the plastic is put in tension. A curved tensioning bar is urged against the sheets to deflect the sheets and increase the tension, tension being greater in the area to be slit. Slitting is accomplished by an elongate knife blade angularly disposed with respect to the web of material so that the material is slit, then the material drags along the sides of the knife blade. The knife is heated to seal the edges, and the slit edges are held in tension until they reach the next roll. The sealed edges are then heated for final setting to achieve a strong seal.
REFERENCES:
patent: 2423187 (1947-07-01), Haugh
patent: 2759524 (1956-08-01), Davis
patent: 2781079 (1957-02-01), Ruby et al.
patent: 4070222 (1978-01-01), Olson
patent: 4211599 (1980-07-01), Bolter et al.
patent: 4259134 (1981-03-01), Joice et al.
Middleton James B.
Wityshyn Michael G.
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