Patent ID: 7964129

Claim:
A method of uniformly cooling of a molding surface of a mold for dies and molding of articles using dies wherein the mold comprises at least one completely closed chamber having air substantially removed therefrom and having a single quantity of liquid therein which extends to cover at least one area adjacent to and on an opposite side of the molding surface of said mold, wherein said molding surface comprises a separating wall or walls having a uniform thickness through all of the wall or walls through which cooling is effected and wherein the level of the liquid is sufficient to cover all of said at least one area including said wall or walls of the chamber from which heat is to be taken and wherein each of said at least one completely closed chamber being integrated within the mold and a space above the single quantity of liquid and within the completely closed chamber in which pressure within the space is caused to be set at a level which will enable the single quantity of liquid to boil at a selected temperature, said selected temperature being at a level such that the temperature is below a temperature of the at least one area adjacent to the molding surface this being by reason of, as a first step, filling of the completely closed chamber with the single quantity of liquid and then extracting a selected portion of the single quantity of liquid without allowing air to replace the extracted liquid, and passing at a selected cooling temperature, the single quantity of liquid through condensing means to effect, by such cooling, condensation of vapor of the single quantity of liquid in the space to return the condensed vapor to the single quantity of liquid by gravity.