By László Halász (Eds.)
This publication discusses the method theories and automation degrees of crucial polymer strategies that are essential to in attaining product caliber and approach financial system. It describes blending, calendering, screw plastications, sheet and tube extrusion, movie blowing, blow moulding and injection moulding. The keep watch over equipment hired for every of those person methods are offered intimately. The e-book is designed to supply info on static and dynamic techniques and achievable keep watch over structures
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This ebook discusses the method theories and automation degrees of an important polymer techniques that are essential to in attaining product caliber and strategy economic climate. It describes blending, calendering, screw plastications, sheet and tube extrusion, movie blowing, blow moulding and injection moulding.
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Additional info for Control methods in polymer processing
The ultrasonic thickness gauges measure either the ultrasonic resonance, or the ultrasonic impulse reflections. In the first case, the ultrasonic sound reflected and that emitted from the underside of the film or sheet being measured can resonate and produce standing waves. The standing waves develop only if the required thickness 50 is an integer multiple of the wavelength of the waves. 39) where k is the order of harmonics, v is the velocity of ultrasonic sound in the material under consideration, and/ k is the resonance frequency.
2. summarizes the characteristics of some manometers. 3 Rotational Speed Measurements For processing machinery one of the most relevant parameters is the rotational speed arising from the need to adjust the rate of rotation of the rotors, rolls and the turn of screws. Methods used to measure the rotational speed may involve: — stroboscopes, — tachogenerators and — impulse methods. Stroboscope tachometer The stroboscopic tachometers are generally used in research and development purpose plasticating units.
In a given channel the local distribution of the temperature of the polymer melt may be represented by a parabolic curve, thus, the measuring element in the channel measures the average temperature in the section available for the measuring element used. In practice the following temperatures may be determined: a) b) c) d) e) Fig. 25. Measuring devices employed to measure the temperature of the material a. temperature measuring device, used to measure the temperature near the wall, b. immersion ther mometer, c.