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678 --- Industries based on macromolecular materials. Rubber industry. Plastics industry --- 678 Industries based on macromolecular materials. Rubber industry. Plastics industry

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Extrusion process. --- Polymers --- Extrusion. --- Polymere --- Polymeride --- Polymers and polymerization --- Macromolecules --- High energy forming --- Manufacturing processes --- Power presses

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The plastics engineer working on the shop floor in a plastics manufacturing plant often needs quick answers to questions such as why the extruder output is low or whether he can expect better quality product by changing the resin or if the die pressure can be lowered. Applying state-of-the art numerical software to address these issues is time-consuming and costly. Starting from practical design formulas which are easily applicable, and yet take the resin rheology into account, this guide provides answers to these questions quickly and effectively by guiding the user step by step through the computational procedures on the basis of illustrative technical examples. Problems related to melt fracture, homogeneity of the melt, effect of screw geometry on the quality of the melt and the effect of die pressure on the pellet surface and their troubleshooting are only few of the topics among many that are dealt with in detail. All the calculations involved can be handled by pocket calculators and hence can be performed right on the site where the machines are running. This guide is a valuable tool not only to troubleshoot but also to estimate the effect of design and process parameters on the product quality in plastics processing

Plastics --- Molding --- Mathematical models. --- Plastic materials --- Plastic products --- Polymers --- Synthetic products --- Condensation products (Chemistry) --- Elastomers --- Plasticity --- Chemistry --- Polymers and Plastics