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A study has been carried out which demonstrates a technique for measuring long fibre lengths. This technique has been used successfully to discuss subtle differences in the fibre length distributions arising in a range of long fibre reinforced thermoplastics. These new materials were processed using a wide range of injection moulding conditions, including such variables as the injection speeds and the preplasticising screw back pressures. This work proposes mechanisms of fibre attrition in the injection moulding process and makes recommendations for the optimisation of fibre lengths in moulded articles. It is shown that alternative polymer matrices in the long glass fibre attrition. It is also demonstrated that this family of long fibre reinforced thermoplastics can be recycled successfully with considerable fibre length advantages over traditional extrusion precompounded short fibre compounds.
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Bailey et al. (1987) studied this question.
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