装盒充填出的塑料上粘附石膏较常发生。本文就其发生原因和改进方法进行讨论。可能的原因有: 1.分离剂过稀或过稠,造成成膜质量差。除了配制中配比不合适会造成分离剂过稀外,贮存期过长或防腐不良均可造成海藻酸盐降解,使分离剂变稀,使用前应注意观察。过稠则常由于使用时不及时加盖或反复涂蘸,将微小的石膏颗粒混入分离剂中,形成不溶的海藻酸钙; Box filled with plastic filled plaster occurs more often. This article discusses its causes and ways to improve. Possible reasons are: 1. Separating agent is too thin or too thick, resulting in poor film quality. In addition to the preparation of the ratio of inappropriate will result in the separator too thin, too long shelf life or poor corrosion can cause alginate degradation, so that the separation agent thinning, should be observed before use. Too thick often due to the use of not timely stamped or repeatedly dipped, the tiny gypsum particles mixed with the separating agent to form insoluble calcium alginate;