He has prepared a special core sand and solved the problem of cleaning blind holes successfully.
配制了专用芯砂，成功地解决了异型盲孔的清砂问题。
The results show that the process is a clean process of mold and core sand foundry and does not pollute environment.
实验结果表明，该工艺不污染环境，是铸造型芯砂的清洁生产工艺。
Veining defects have been effectively prevented and eliminated by improvement on gating system, especially by special additive to core sand and sinter coating on surface of sand core.
通过改进浇注系统，特别是采取在进、排气道芯砂中添加特殊抗脉纹添加剂及在砂芯表面涂刷烧结型涂料等工艺，有效地预防和消除了脉纹缺陷。
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