The occurrence of weld lines throughout the field of polymer processing has been recognized as one of that discipline's unsolved problems [1]. A recent review has been made of this phenomenon which occurs wherever molten polymer flow fronts meet [2]. The mechanical properties of weld regions have been determined to be very sensitive to processing conditions in both amorphous and semicrystalline injection-molded thermoplastics [3–8].
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Malguarnera et al. (1981) studied this question.
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