Method for manufacturing an elastic mold

A method of manufacturing an elastic mold, which comprises the steps of:

• pretreating an external surface of a pattern mounted on a face of a plate to facilitate rubber adhesion of the pattern, the pretreating step comprising dipping the pattern mounted on the face of the plate into a coagulation liquor, said face of the plate being dipped at a right angle to a surface of the coagulation liquor and withdrawing said pattern from said coagulation liquor to provide a uniform film thickness and avoid air bubble entrainment in the elastic mold product;
• dipping the pattern mounted on the face of the plate into an elastic mold solution, the face of the plate being dipped at right angles to a surface of said elastic mold solution to form an elastic film on the plate and on the external surface of the pattern;
• withdrawing the pattern from said elastic mold solution;
• vulcanizing the film on the pattern;
• and
• peeling the film off the pattern to obtain an elastic mold having an internal surface for receiving and holding casting material, the internal surface of the elastic mold being defined by the external surface of the pattern, said internal surface being in contact with said external surface prior to peeling of the elastic mold, and said elastic mold having a fixing member which corresponds to the face of said plate as an integral part of the mold.