Method of filling a mould with plastifiable material by means of an injection ram or a ram screw acting as an injection ram, and apparatus for carrying out the method

摘要

The method is based on the object of avoiding the disadvantages and difficulties occurring during the filling of a mould (18, 19). The method is to allow the pressure to be regulated in such a way as to allow the cooling which occurs concurrently with compression to take place entirely or partially with the specific volume of the moulding compound remaining constant, to allow the beginning of such a stage to be set and also to allow a melt cushion to be retained. The object is achieved by switching within the pressure-controlled filling phase, after an initial increase in the melt pressure in the mould cavity (17) immediately or with a delay from a driving pressure differential between injection ram or ram screw (11) and the mould cavity (17) to a pressure balance between injection cylinder (10) and mould cavity (17) and/or by the injection ram or ram screw (11) being held against melt back-pressure in the position reached at the switching instant. IMAGE