Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Presses or press platen structures – per se
Patent
1975-03-11
1977-04-26
Drummond, Douglas J.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Presses or press platen structures, per se
100171, B32B 3100, B30B 304
Patent
active
040199495
ABSTRACT:
A heat sealing apparatus for sealing together two layers of heat softenable plastics material, for example two sides of the top of a bag or sack, comprising a pair of rollers arranged to nip said layers together to form a seal after they have been softened, means loading one roller towards the other roller and permitting said one roller to be urged away from said other roller against the load exerted by said loading means on passage of layers of plastics material between the rollers, and stop means arranged such that said loading means exerts a reduced loading on the rollers in the absence of layers of plastics material to be sealed.
REFERENCES:
patent: 1296112 (1919-03-01), Peiler
patent: 2385583 (1945-09-01), McLauchlan
patent: 2680470 (1954-06-01), Stanton
patent: 2818904 (1958-01-01), Ambrose
patent: 3138695 (1964-06-01), Bracich
patent: 3218218 (1965-11-01), Bratt et al.
patent: 3218961 (1965-11-01), Kraft et al.
patent: 3531361 (1970-09-01), Grandinetti
patent: 3623933 (1971-11-01), Staats
Drummond Douglas J.
The Thames Sack and Bag Company Limited
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