Pressure injection moulding method and device for after- pressure at pressure injection moulding

摘要

Pressure injection moulding method with phases of the mould closing, of the approaching of an injection unit to a form, of the cavity filling with a thermoplastic, of the removal of an injection unit, of the plasticizing and of the cooling of a moulding, of the mould opening and of the extension of a ejection system is solved so, that after the phase of filling of the cavity of the thermoplastic followed the phase of the after-pressure of at least one local feeding on the mould cavity adjustable defined volume. The pressure of the after-pressure of the local feedings on the mould cavity is independent of the pressure of the cavity filling with thermoplastic by the injection unit. The after-pressures of the individual local feedings on the mould cavity are independent of each other. For the after-pressure of the local feedings on the mould cavity closes a nozzle of the injection unit. Device for after-pressure at pressure injection moulding consists of at least one local feeding cavity (9) formed in a shaper (2) and / or in a block (1) and opening up into a mould cavity (10), while in the local feeding cavity (9) is arranged a moving core (6) of a moving mechanism. The moving mechanism consists of the moving core (6) and referring to a moving sliding element (7), which is connected to a hydraulic cylinder (8), wherein the moving core (6) is with the moving sliding element (7) in contact over an inclined plane surface.