一 緒言型砂對鑄造工业產品優良與否关係重大,此為从事铸造工业者所周知,鑄造工作者应依铸件之種類,選擇適當之型砂,型砂之性質应從物理的化學的及的地質的各方面加以研究,如果能够在铸造工场附近地區發现合適之型砂,可以節省很多运费,這是最合乎理想的事。 An introductory sand has a great influence on the quality of foundry industrial products. This is well known to those engaged in foundry industry. Foundry workers should select appropriate type of sand according to the type of casting. The nature of sand should be from the physical chemical and geological ones. In terms of research, if it is possible to find suitable sand in the vicinity of the foundry, it can save a lot of freight, which is the most desirable thing.