砂芯脱盒至浸涂料的放置时间、浸涂料后不同的干燥方法及不同涂料对砂芯的强度都有不同程度的影响。
The time from pattern removal to coating, different drying methods and coatings will have different effects on strength of 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。
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.
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