1. Dimensional variation is an unexpected change of part dimension РCauses of dimensional variation РDimensional variation can be caused by 尺寸变化是由于:РUnstable machine control 机台控制不稳定РA narrow process window成型窗口狭窄РImproper process conditions settings 成型条件设计不合理РA broken check ring (within the injection unit) 计量单位不准确РUnstable material property 材料性能不稳定РImprove the material preparation改善成型前准备РContact the material vendor and change the material lot if the material has patch-to-patch variation.联系材料供货商更换材料批次如果材料按批次变化РPre-dry the material before molding if the material is too wet.如果材料太潮,进行成型前预干燥РLimit the percentage of regrind material added to the origin material.限制回收料加入到原料的比例РThe irregular particle size can cause different levels of mixed melt material, and lead to unstable molded part dimensional
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