Abstract
The quantitative description of the flow properties of non-newtonian thermoplastic melts in channels of various geometries is generally satisfactory for application to the design of plastics processing equipment. Mixtures of short glass fibres and non-newtonian thermoplastic melts have been shown to cause special flow problems; furthermore, the properties of short fibre-reinforced thermoplastics in the solid state are known to depend strongly on fibre orientation and fibre length which, in turn, are strongly influenced by the flow of the mixture in the molten state. A knowledge of the flow characteristics of short fibre-reinforced thermoplastics in the molten state as a function of the characteristics of the components is now very much needed. Two special rheometers have been constructed for investigating the flow of these composite melts in channels of rectangular and circular cross-section. They enable study of the effect of channel length, diameter, gap thickness and entrance conditions. Quantitative results illustrating the influence of fibres on the flow are discussed in view of their use for design purpose.
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