Abstract
Residual stresses have been measured in sepiolite-filled and talc-filled polypropylene compounds having filler levels of 10%, 25% and 40% by weight. The stress distributions depart significantly from parabolic in shape after ageing at 20° C, and have also been determined after annealing and after storage at −80° C. Complex changes occur, especially with the talc-filled materials. Some of the changes occurring during annealing can be attributed to changes in molecular orientation, primarily in the skin. The significance of these results is discussed with reference to distortion of injection mouldings.
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