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By A.H. Clark

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Sections of the barrel are at times cooled to remove excessive heat generated by viscous dissipation. The die continuously shapes the melt into the desired form and the product is formed which is infinite in one direction. The molten profile produced is cooled either by air water quench or by running it overchill rolls. Further information on various extrusion processes can be found in existing literature [158,173,175-177,1791821. Thermoforming is the process by which flat polymer sheets or films are shaped into fairly deep-drawn container forms as shown in Fig.

Therefore, a LDPE line cannot be adapted to process HDPE because of the torque limitation. Therefore, a LDPE line can have a maximumscrew speed as high as 150 rpm, whereas the maximum screw speed of a HDPE extruder has to be 100 rpm or less. A good mold design for controlling product quality has to be done also on the basis of the rheology of the system. For example, the optical clarity in a poly(methy1 methacrylate) product is lost due to thermal degradation. When the melt enters the mold through the gate, it experiences high shear rates, leading to viscous heat generation in localized places whereby the polymer degrades and leaves white flow lines in the product.

V. , Polymer Mixing Technology,Applied Science Publishers, New York Fisher, E. G. and Chard, E. , Int. , Compounding of Fillers, AdvancesinChemistrySeries, No. Amer. Chem. Soc. pp. ,Techniques for compounding glass fiber-reinforced thermoplastics, PoEng. , (Jan. , Plastics CompoundingExtruders, ChemicalEngineering No. Instn. Chem. Engrs. pp. , Machinery for the production of coloured thermoplastic compounds, Colour Compoundings in Western Europe Conf. Overview 193. Todd, D. B. and Baumann, D. , l b i n screw reinforced plastics compounding, Polym.

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