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Method of making an insulated metal mold

Image Number 3 for United States Patent #4285901.

An element having a molding surface defining the cavity of a mold for molding thermoplastic resin and a method of making the element. To regulate the cooling speed of the molten resin to be injected or placed into the cavity, the molding surface is provided by a thin metal layer and a layer of heat insulating material is formed on the inner side of the metal layer.

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