Package making – Methods – Applying a partial cover
Patent
1986-05-20
1987-06-30
Sipos, John
Package making
Methods
Applying a partial cover
53441, 53556, 53588, 53210, 53465, B65B 1304
Patent
active
046760482
ABSTRACT:
A rotatable film wrapping apparatus for wrapping a load on a conveyor with an overwrap of stretched plastic film web, having a ring-mounted film web pre-stretch mechanism which stretches and dispenses film at a varying speed controlled independently of variations in film tension and speed between the pre-stretch mechanism and the load, and a supply speed control mechanism which varies the supply speed of web from the pre-stretch mechanism as the ring rotates. The supply speed control mechanism is configured as a predetermined model of the load to minimize variation in film elongation and containment as successive load edges intercept film web during wrapping, thereby locking in these characteristics at predetermined levels for film web wrapped across the load side which ends at the edge. The pre-stretch mechanism comprises a downstream roller across which the film is drawn at a speed which varies, an upstream roller engaging the film and linked by gears to the downstream roller so that the upstream roller rotates at a fixed fraction of the downstream roller speed to stretch film between the rollers, and a power pulley or roller which extends to one side of the pre-stretch mechanism and engages the supply speed control mechanism to accelerate and decelerate the upstream and downstream rollers. Because the supply speed control mechanism drives the pre-stretch mechanism independently of the moving film web, tension reductions in the web caused by holes at web imperfections do not slow or stop the pre-stretch mechanism, so that holes move to the load without expansion and web destruction. The supply speed control mechanism overcomes rotational inertia of the film roll and pre-stretch mechanism to accelerate and decelerate film supply without delay caused by inertia.
REFERENCES:
patent: 4317322 (1982-03-01), Lancaster
patent: 4387548 (1983-06-01), Lancaster
patent: 4418510 (1983-12-01), Lancaster
Lancaster Patrick R.
Lancaster William G.
Lantech Inc.
Sipos John
LandOfFree
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