- July 10, 2006, David J. Bentley, Jr., Contributing Editor
Providing practical information to the converting and packaging industries…
Automatic Servo Positioned Air Knife Systems for Optimal Cast Film Quenching
by Fred Suppon and Beth Wells, Black Clawson Converting Machinery, Inc.
These features have all been combined into one system that provides optimal cast film quenching and gentle pressure to lay the film smoothly on the chill roll. It also minimizes the entrapped air layer between the film and the chill roll with superior repeatability over traditional air knives. This paper examines these and other features and lists expected benefits.
To address air knife position with relation to the die and chill roll, this system allows three modes of mobility. They are vertical (orbital around the chill roll axis), radial (linear position from the chill roll surface), and angle of the air knife lips or beak. Each axis of movement relies on control from its own servo positioning system. Repeatable positioning, stable pressure, and temperature aid the pursuit of producing the highest quality film for a converter. The automatic and manual features fully described in the paper combine into one system to give the converter an effective tool toward the goal of optimum film quality.
Inertial Measurement Of Roller Parallelism
by Sebastian Busch, PRUFTECHNIK Service, Inc.
In contrast to all conventional system, inertial alignment is a completely new approach to roll alignment. It uses highly accurate ring laser gyroscopes that have a so-called “inertia.” These high-precision instruments have become known as the backbone of navigational systems in aircraft and satellites. If a point in Cartesian space is specified as a reference point as the ideal point with the device, the device can then specify every other point in the same space with respect to its deviation from the horizontal and vertical planes. An “ideal” roller within the machine becomes a reference point. Inertial alignment stores and remembers its relative position and compares it with each subsequent roller being measured. Their relative angular position can be stored, displayed, and processed automatically, without any need for manual intervention.
By using an inertial measurement, gaining complete insight in a plant is possible. Inertial alignment allows pinpointing the root cause of a problem very quickly and accurately. It also provides the first complete picture ever performed in the lifetime of a machine.
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