Low heat capacity gramophone record - press

摘要

Gramophone record mould consisting of two mould halves each with a matrix, with a channel system for heating and cooling by steam or water, has mould halves in the form of pots which consist of a thin lid carrying the matrix with, at its back, heating and cooling ducts and a bottom section which closes off the ducts. A honey-comb mould carrier fits the mould halves without permanent connection and takes the pressure during moulding but allows only a slight heat exchange.