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随着制芯工艺技术的发展，对射砂紧实机理的研究日趋深入，以便更好地解决目前射砂机构存在的诸多问题。本文对射砂紧实机理进行了系统分析，认为：动能是紧实的实质。根据这一观点，对射砂机构的演化进行了探讨，指出低压射砂是目前最优秀的射砂工艺。
With the development of core technology, the research on compacting mechanism of shotcrete is going deeper and deeper, so as to solve many problems existing in shotcreting mechanism. This paper systematically analyzes the compaction mechanism of shotcrete, and thinks: kinetic energy is the essence of compaction. According to this view, the evolution of sand shooting mechanism was discussed. It is pointed out that low pressure shot sand is the best shooting sand technology at present.