Patent ID: 8070478

Claim:
A mould assembly, comprising: a mould defining a cavity which is completely closeable in an operating state; an injector at least partially accommodated in the mould and having a discharge opening which opens into the closed cavity, said injector including an injector needle having cavity-proximal tip, a material feed duct, and a material return duct, wherein the material feed and return ducts port in a region of the cavity-proximal tip into a connecting chamber so as to be in flow connection with each other via the connecting chamber, said injector needle being switchable to move between a first operating position in which the discharge opening is closed by the tip of the injector needle as the tip sits on the discharge opening, and a second operating position in which the injector needle is lifted from the discharge opening so that the discharge opening has a flow connection with the connecting chamber, thereby opening the injector.