Control methods in polymer processing by László Halász (Eds.) PDF

By László Halász (Eds.)

ISBN-10: 044498741X

ISBN-13: 9780444987419

This publication discusses the method theories and automation degrees of crucial polymer procedures that are essential to in achieving product caliber and strategy economic climate. It describes blending, calendering, screw plastications, sheet and tube extrusion, movie blowing, blow moulding and injection moulding. The keep watch over tools hired for every of those person techniques are awarded intimately. The ebook is designed to supply info on static and dynamic methods and doable keep an eye on platforms

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Sample text

Depending on the specific nature of the process, static and dynamic models may be derived. In the former case time is not included as one of the variables, while in the latter case time is an independent variable. In spite of the fact that the processes taking place are obviously time dependent, in several instances the static model is well suited for the representation of processes, where the rate of change is slow, and states regarded as steady develop. Such static models reflect the basic inner relationship of the technology and, for this reason, significant help is provided by such a static model to bring about near-optimal controls over a process characterized by a slow rate of change.

Radiometric thickness gauges are used in the range 10 jim to 800 um, up to a maximum tem­ perature of about 80 °C. Where infrared absorption is employed as the measuring technique, the method involves the absorption of an infrared light beam that either penetrates through the 6 7 Fig. 31. Isotopic measuring device used in calenders 1. radiation source, 2. foil, 3. ionization chamber, 4. resistance, 5. counter, 6. reference plate, 7. com­ pensating radiation source, 8. synchronizer, 9. deflection device, 10.

The algorithm itself describes the logical and mathematical relationships in the control of the given process, and the programme realising it means a complex set of instructions, which may be regarded to be a representation of the control algorithm in a more or less idealized and simplified format, to make possible mathematical description of the relationships between the phenomena in the process. In fact, the model of the process is equivalent to the control technical description of the laws governing the process.

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Control methods in polymer processing by László Halász (Eds.)

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