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

By László Halász (Eds.)

ISBN-10: 044498741X

ISBN-13: 9780444987419

This publication discusses the method theories and automation degrees of crucial polymer methods that are essential to in achieving product caliber and method 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 techniques are awarded intimately. The ebook is designed to supply details on static and dynamic techniques and attainable keep watch over structures

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Another group of parameters is the characteristics of the technological equip­ ment and machines used in the specific process which may be the wall temperature of the machinery in which these technological processes take place, the number of revolutions, the torque, the power requirements of the rotating unit, and so on. The ultimate task of the processing method is to maximize productivity with the desired product quality. Thus, all control processes include some parameters that determine some specific flows (for example mass flow).

In order to be able to connect the three-stage servomotor block to the controlled process, a linear relationship must be ensured between the operation velocity and the actuating signal. This may be achieved by providing the three-staged block with a delayed feedback system. + *d :EJ fL SHE Fig. 20. Control loop, fitted with a three-position member in a servo motor (an execution unit) and proportional section Lower diagram: changes of the controlled three-position member, x; the output, y{; and the interfer­ ence, y; with respect to characterization in all three cases.

Parison b. the positioning of the photocells to measure the velocity of the parison. 49 — ultrasonic, — radioactive, — infra-red measuring, and — inductive methods. The particular use of each of the above measuring methods is summarized in tabular form below: Induc­ tive Optical Mechan­ ical Ultra­ sonic Radioisotope + + + + + + + + Tube extrusion length wall thickness + + + + + Sheet extrusion length width thickness + + + + Calendering width thickness + + Film blowing width thickness + + Processing method Profile extrusion length cross-section IR + + + + + + + + + + The optical width and length measuring devices may operate on traversing or on reflection principles.

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


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