Apparatus for heat sealing two superposed layers of plastic film

Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Automatic and/or material-triggered control

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493 8, 493 10, 53 51, 53 64, 53 75, B32B 3100

Patent

active

055408028

ABSTRACT:
An apparatus for heat sealing two superposed layers of plastic film, in which movable sealing bar means are disposed opposite to fixed sealing bar means so that the layers of the plastic film are intermittently passed between the movable and fixed sealing bar means. The movable sealing bar means is reciprocatingly moved whenever the plastic film layers are intermittently fed. The layers of plastic film are sandwiched between and heat sealed by the movable and fixed sealing bar means when temporarily stopped. The feeding speed for the layers of plastic film, the feeding time for the layers of plastic film, the driving speeds of the movable sealing bar drive means and the heat sealing time for the layers of plastic film are computer controlled. The computer is programmed so that a waiting time can be inserted between the plastic film feeding time and the plastic film heat sealing time. Accordingly, the plastic bag making speed can be optionally lowered without changing the length of the plastic bag and heat sealing condition.

REFERENCES:
patent: 2374779 (1945-05-01), Preston
patent: 2676444 (1954-04-01), Gaubert
patent: 3397633 (1968-08-01), Harris
patent: 3494816 (1970-02-01), Fener
patent: 4229244 (1980-10-01), Swope
patent: 4378266 (1983-03-01), Gerken
patent: 4391079 (1983-07-01), Cherney

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