Molding of a Mold Using Sugar as a Binder

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  • 糖類を粘結剤とした鋳型の造型
  • トウルイ オ ネンケツザイ ト シタ イガタ ノ ゾウケイ

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Abstract

<p>The purpose of this study was to convert petroleum-derived phenolic resins as an organic binder of mold to natural polymer substances obtained from renewable resources. Starch as natural polymer was thermally decomposed with acid or hydrolyzed with enzyme to afford dextrin. We attempted to use the dextrin dissolved in cold water as a binder of core mold for casting. The binder was uniformly coated on the refractory aggregate to obtain a fluid mold material. The binder is only baked without generation of adhesive strength when the mold material is filled into a heated mold. Condensation of steam occurs by supplying superheated steam to the particle voids of the mold material filled in the molding. The binder gives adhesive strength by swelling and gelatinizing with the condensed water, and the ambient temperature instantly reaches around 100℃ due to the heat of condensation. Subsequently, we found that a core mold can be formed by drying and solidifying or curing the binder though evaporation of the condensed water with the sensible heat of dry steam of 100℃ or higher.</p>

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