Method of molding an article in an expansible mold and removing the

Abstract

A commercially feasible method is provided for molding high quality seamless, irregularly shaped articles such as wax candles which are essentially free of surface defects and other molding imperfections by provision of relatively thin-walled, self-sustaining but distensible molds having high heat transfer properties, in conjunction with mold-receiving housing structure including liquid delivery, circulation and removal apparatus for supporting the molds against perceptible distension under the weight of molding material while accelerating solidification of the wax, and for inducing distension of the molds by the technique of removing only a small portion of the cooling liquid without creating significant liquid-free voids in the mold tank. Thus, the method hereof avoids the necessity of complete draining of the mold tank during each molding cycle which in turn speeds the process and renders it more economical. In preferred forms of candle-making, the mold cavities are preheated with hot air to prevent premature solidification of wax therein to ensure complete and even flow of wax throughout the mold, while also facilitating the escape of any air entrained within the complex surface contours of the mold. Novel apparatus is also provided for supporting the molds in the housing structure, positioning a prefabricated central wax core or plug within the mold cavities, and for permitting essentially automatic wick installation during the candle molding operation itself. Self-extinguishing candles are also disclosed wherein the wicks thereof terminate above the candle base to preclude complete burning of the candle.