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CHICAGO — A seven-layer blown film line running at Battenfeld Gloucester Engineering Co. Inc.'s exhibit (Booth S1800) will compare two types of bubble thickness gauging.

Battenfeld also is showing a new, movable version of its Traversanip haul-off.

The seven-layer line is equipped with five extruders with 2-inch screw diameters, and two extruders with 21/2-inch screw diameters. It has internal bubble cooling, and a Series 800 adjustable-lip air ring.

The line has data collection systems that use gamma and beta thickness gauges. As the machine runs at NPE, data from the two systems is being compared for accuracy, according to William Hellmuth, senior product manager for blown film systems.

Unlike fixed haul-offs, Battenfeld's Traversanip oscillating haul-off allows the operator to move it up and down easily, by a total of 8 feet. That increases or decreases the nip rolls' center-line height. The mechanism, located on top of the blown film tower, oscillates a full 720 degrees, giving fully random gauge bands across the full width of the web.

A higher nip height is needed to add cooling time, for example with linear low density polyethylene film. The height can be lowered for stiffer films such as high density PE.

Battenfeld Gloucester also will show its low-profile die for single-layer and coextrusion film. The blown film die stands just 40 inches high, from floor to air ring. The firm said the low profile makes bubble thread-up safer and easier than with higher dies. Film quality also is improved, because the resin's residence time inside the die is reduced.

Battenfeld Gloucester also is showing its Acurablend gravimetric blending and feeding systems. The blenders are built at company headquarters in Gloucester, Mass. Acurablend is available in batch, continuous or feed-throat configurations.

An Extrol 6032 process control system is controlling the line.

Battenfeld Gloucester also is introducing a lay-flat control system that uses five sensors to measure bubble diameter. The system differentiates between an actual change in diameter and normal bubble movements. The sensors send out ultrasonic signals.

The lay-flat controller uses a Motorola 32-bit microprocessor.

In cast film, Battenfeld Gloucester has a high-speed film winder with equipment to remove the roll of film automatically, with no operator action. An unloading arm lowers into place and locks onto a sleeve, stripping off the rolls and placing them on a conveyor.

A new oscillation unit permits higher web speeds with no loss of film quality.

Also on display at the company's booth: a 128-inch-wide Model 700 cast film machine, a foam sheet line and two bag-making lines.