Battenfeld Gloucester Engineering Co., Inc.

Gloucester Engineering Co., Inc.

David J Smith

J Corey Michal

Kenneth D Warnock, Jr

Several small diameter short width rolls () of plastic film () are wound from a larger width and length of plastic web in a continuous manner. The disclosed apparatus slits the larger width plastic web into several narrower width plastic webs, positions the slit webs on a single large diameter winding drum () and then winds each narrower width web at a separate winding turret (). At each turret, the plastic web is rolled around a first mandrel until the roll achieves the desired size. Then, a second mandrel contacts, the plastic web and the plastic web is severed between the first mandrel and second mandrel and attached to a second mandrel to be rolled into a roll of desired length. The process is repeated at each turret such that the several plastic webs are simultaneously wound in a continuous fashion.

Stretch film winder

An improved air cooling device for the production of cast film is shown. The device is intended to increase production rates for film without reducing the level of film gauge control. The devices utilizes a soft box for the bulk of the cooling and a directional source of pressurized air to deflect exhaust air from the soft box from striking the web curtain between the die and chill roll.

Cast film cooling device

Apparatus and method are described for controlling thickness of plastic films produced by the blown film process. The apparatus is an air cooling ring modified to include devices for locally modifying the temperature of the air discharged from the air ring onto the blown bubble. Local variations in the temperature of the cooling air applied to the surface of the bubble result in variations in the bubble cooling rate and viscosity, with consequent variations in thinning during transverse bubble expansion. The method includes controlling the location and extent of local temperature variation applied to the bubble in response to comparison of measured film thickness with a desired film thickness.

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Topsfield, MA, United States of America

David J Smith