Payout for filling closed casting moulds with plasticised melt - feeds melt from e.g. extruder through two-way valve to fill pressure chamber and then reverses valve so that shot is expressed into mould(s).

摘要

One or more closed casting moulds are filled by the intrusion of measured quantities of plasticised polymer material, and of contaminated recycled thermoplastics in partic. from an intermittently operating extruder/plasticiser with an intermediate pressure-dose reservoir. The recycled material from the extruder etc. is fed into a pressure-dose reservoir through a 2-way valve when a set volume has reached that reservoir through a 2-way valve; when a set volume has reached that reservoir further melt flow is cut off and the feedline to the casting mould is opened; the mould is then filled with the metered quantity of melt under high pressure which flows in at high speed. ADVANTAGE - The process of filling the mould(s) is simple, and the high flow speed means that there is no significant drop in the melt temp. The large volume moulds can be filled from small capacity extruders/plasticisers.