The process of rotational foaming molding of liquid reactive resin was studied, with unsaturated polyester resin as the shell of unfoamed resin moulded part, and polyurethane as foamed core layer.
以不饱和聚酯树脂作为非发泡树脂成型制品的外壳，用聚氨酯树脂发泡形成泡沫芯层，研究了液体反应树脂的旋转模塑发泡成型泡沫夹层制品的工艺过程。
Mechanisim of hot-core box non-occupying coating process, its practical effects on manufacturing the whorl shell core, and its technical essentials have been summarized in detail.
介绍热芯盒法非占位涂料技术的原理，及其在制备螺纹壳芯中的应用效果，并归纳总结其工艺要点。
The intermittent break expansion phenomenon caused by sliding or overturning of clay core during the scouring process of downstream shell break-induced flows is considered.
该模型较好地考虑了漫坝水流对下游坝壳冲蚀过程中黏土心墙滑动或倾覆失稳所引起的溃口间歇性增大现象。
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