초록 ▼

An apparatus for the production of marbled articles by injecting into the injection molding die of an injection molding machine two confluent streams of plastic raw material of different hue or color which are supplied from two injection units, via separate pulsation channels which open into a commo

An apparatus for the production of marbled articles by injecting into the injection molding die of an injection molding machine two confluent streams of plastic raw material of different hue or color which are supplied from two injection units, via separate pulsation channels which open into a common nozzle channel, just ahead of the mold cavity. The plastic raw materials flowing in the two pulsation channels are subjected to an intermittant and alternatingly pulsating advance by means of feed thrust pulsation controls which generate an intermittant advance of the plastification screws of the injection units. At the junction between the two pulsation channels may be arranged a pulsation chamber with oppositely oriented material entry ports which are alternatingly closed by a reciprocating pulsating element which moves with the pulsating plastic streams.

대표청구항 ▼

An apparatus for injecting confluent streams of plastic raw material from separate sources into the molding die of an injection molding machine, which machine has a die closing unit carrying a stationary die half on a stationary die carrier plate and a movable die half on a movable die carrier plate

An apparatus for injecting confluent streams of plastic raw material from separate sources into the molding die of an injection molding machine, which machine has a die closing unit carrying a stationary die half on a stationary die carrier plate and a movable die half on a movable die carrier plate, guiding the latter for axial die opening and closing movements on at least two parallel tie rods, the plastic materials injecting apparatus comprising in combination: an injector head in the form of an intermediate stationary die plate which is mounted on the stationary die carrier plate and supports a stationary cavity plate, as part of the stationary die half; a generally axially oriented sprue opening in the stationary cavity plate; a generally axially oriented first injection unit with a plastification screw surrounded by a plastification cylinder having a cylinder nozzle at its discharge end and hydraulic drive means operable to rotate and axially advance the plastification screw for plastification and injection of a first raw material through said cylinder nozzle; an axial pulsation channel in the injector head linking the opening of the cylinder nozzle of the first injection unit with the sprue opening of the stationary cavity plate; a generally radially oriented second injection unit with a plastification screw surrounded by a plastification cylinder having a cylinder nozzle at its discharge end and hydraulic drive means operable to rotate and axially advance the plastification screw for plastification and injection of a second raw material through said cylinder nozzle; a radial pulsation channel linking the opening of the cylinder nozzle of the second injection unit with the sprue opening of the stationary cavity plate; a centrally located injector nozzle as part of the injector head, the injector nozzle having a cavity which forms a flow junction at an acute angle between the axial and radial pulsation channels and a common nozzle discharge channel at its discharge end, the latter leading directly into the sprue opening of the stationary cavity plate; a pair of supporting rods guiding the first injection unit for axial movements in relation to the injection head; and a pair of supporting rods similarly guiding the second injection unit for radial movements in relation to the injection head, both pairs of supporting rods being rigidly connected to the stationary structure of the die closing unit.