49594 ⎘
Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor; Component parts, details or accessories; Auxiliary operations; Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs using vacuum means for holding the disc on one of the mould walls during opening of the mould