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A METHOD FOR MAKING CAST MOLDS AND MALES
A METHOD FOR MAKING CAST MOLDS AND MALES
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机译:制作铸模和苹果渣的方法
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摘要
Foundry moulds and, more especially, cores are made by the use of a binder comprising ammonium polyacrylate and zinc oxide or a metal salt to form a complex ammonium metal polyacrylate which is mixed with the sand and after the core or mould has been formed in a warm box warm air is passed through it to drive off the ammonia and form a water-insoluble metal polyacrylate which bonds the grains of sand together. The resulting core or mould has a good shelf life combined with excellent knock-out behavior.
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