| 摘要 |
1468576 Mixing apparatus DEMAG KUNSTSTOFFTECHNIK GmbH 24 April 1974 [26 April 1973] 17950/74 Heading B1C In a mixing apparatus for mixing the constituents of a plastic composition during injection into a mould cavity nozzles 4 are provided for directing the constituents into a mixing chamber 3 each nozzle having a closing element 10 which is urged in the nozzle closing direction by a hydraulic piston 14 and urged in the reverse direction by the pressure of constituent supplied to a nozzle chamber 7, control means being provided to reduce the hydraulic pressure acting on the pistons 14 so that the closing elements 10 open under the pressure of the constituents to allow inflow thereof for a predetermined period into the chamber 3. The chamber 3 is connected directly to the mould and the period of supply of plastics composition is terminated by application of increased hydraulic pressure to pistons 14. Two embodiments of the nozzles 4 are shown, that on the right differing in having an adjustable screw stop member 21 which limits the travel of piston 14' and thus also of the nozzle closing element.
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