MOLD, METHOD FOR MAKING A MOLD AND METHOD FOR MAKING A PLASTIC-MATERIAL OR COMPOSITE PRODUCT USING SAID MOLD

摘要

The invention relates to an induction-heated mold that includes at least one lower portion and one upper portion defining a cavity in which a material to be molded and to be heated to a temperature Ttr higher than 200C is fed so as to be shaped, at least one of the portions of the mold having an integral area for thermal transfer with the material to be molded, extending to a depth e such that: (I) ReI is the average electric resistivity of the thermal transfer area and f is the frequency of the inductor current, the thermal transfer area including at least one sub-area consisting of at least one ferromagnetic material having a Curie point TC of between 20 and 800C and in contact with the material to be molded and/or with a non-ferromagnetic coating having a thermal conductivity higher than 30 W.m-1 K-1 and a thickness lower than e/10. The invention also relates to a similar mold including at least two thermal transfer sub-areas having different magnetic permeability from one another close to the temperature Ttr, and to methods for making molds according to the invention and to a method for making a plastic-material or composite product using the molds of the invention.