| 摘要 |
A mould for the moulding of plastics by means of a method in which the necessary heat is applied to the plastic (K) during moulding by applying an electromagnetic field, this mould being principally constituted by a material (3, 4) which does not conduct electricity, in which one or more conducting members (5, 6, 7) are incorporated for the electromagnetic field, these conductors being arranged and shaped in order to guide the electromagnetic field so as to produce, in the active moulding regions (K), a substantially controlled distribution of the field lines and of the strength of the electromagnetic field. These conducting members may have substantially the sole function of rendering uniform the electromagnetic field corresponding to the moulding regions (K), or alternatively they can also have, or only have, the function of concentrating (focusing) the electromagnetic field corresponding to the moulding regions (K), so as to avoid or limit unnecessary heating of the other regions. If metallic inserted components (inserts) or components including conducting portions are present in the mould, these components may be used to constitute some of the conducting members incorporated in the mould for the purpose indicated. <IMAGE> |
