inconsistent shrinkage
Resulting from: a) Material variations such as property variations, varying moisture content, inconsistent melt and pigmentation; b) Process conditions variations such as inconsistent packing and varying mold and melt temperatures; c) Machine variations such as a damaged check ring and unstable controller.是moldflow的帮助文件
material degradation
This can be caused by excessive injection speed, residence time or melt temperature. Improper screw or runner system design may also lead to material degradation.