An injection unit for a moulding machine includes an injection cylinder, and an injection piston is provided in the injection cylinder. During an injection process, the injection piston is configured to push out a plasticized mass—in particular plasticized plastic—from the injection cylinder and to feed it to a moulding tool via an injection nozzle. At least two plasticizing units and two supply channels are provided, and the at least two plasticizing units can be fluidically connected with the injection nozzle by the supply channels. The at least two plasticizing units are configured to supply the injection cylinder with the plasticized mass via the supply channels and the injection nozzle prior to the injection process.

An extruder has a barrel extending from a feed inlet end to an extruder outlet end. The barrel has an inner surface, an outer surface, and a wall thickness between the inner and outer surfaces. The extruder also has at least one heating member positioned provided on the barrel; a screw drive motor drivingly connected to a rotatably mounted screw positioned within the barrel, whereby the screw is rotatable at various revolutions per minute (RPM); and a controller is operably connected to the screw drive motor to adjust the RPM of the screw based upon a temperature of material passing through and/or being extruded from the barrel. Methods for operating an extruder filling a mold are also provided.

An extruder has a barrel extending from a feed inlet end to an extruder outlet end. The barrel has an inner surface, an outer surface, and a wall thickness between the inner and outer surfaces. The extruder also has at least one heating member positioned provided on the barrel; a screw drive motor drivingly connected to a rotatably mounted screw positioned within the barrel, whereby the screw is rotatable at various revolutions per minute (RPM); and a controller is operably connected to the screw drive motor to adjust the RPM of the screw based upon a temperature of material passing through and/or being extruded from the barrel. Methods for operating an extruder filling a mold are also provided.

An injection molding apparatus includes: a first upstream mold formed with a first gate opening into which a first molding material flows; a second upstream mold formed with a second gate opening into which a second molding material flows; a first injection unit configured to inject the first molding material; a second injection unit configured to inject the second molding material; and a downstream mold configured to be clamped to each of the first upstream mold and the second upstream mold. The first injection unit includes a plasticizing mechanism that plasticizes at least a part of a thermoplastic material containing a thermoplastic resin to generate the first molding material. The second injection unit includes a mechanism that mixes a resin and a curing agent to generate the second molding material that is a thermosetting mixture.

A thermosetting composition comprising: (A) a (meth)acrylate compound having a viscosity at 25° C. of 1 to 300 mPa.Math.s with which a substituted or unsubstituted aliphatic hydrocarbon group including 6 or more carbon atoms is ester-bonded; (B) spherical silica; and (C) a white pigment, and having a shear viscosity at 25° C. and 10 s.sup.−1 of 1 Pa.Math.s or more and 500 Pa.Math.s or less and a shear velocity at 25° C. and 100 s.sup.−1 of 0.3 Pa.Math.s or more and 100 Pa.Math.s or less.

A thermosetting composition comprising: (A) a (meth)acrylate compound having a viscosity at 25° C. of 1 to 300 mPa.Math.s with which a substituted or unsubstituted aliphatic hydrocarbon group including 6 or more carbon atoms is ester-bonded; (B) spherical silica; and (C) a white pigment, and having a shear viscosity at 25° C. and 10 s.sup.−1 of 1 Pa.Math.s or more and 500 Pa.Math.s or less and a shear velocity at 25° C. and 100 s.sup.−1 of 0.3 Pa.Math.s or more and 100 Pa.Math.s or less.

An extruder for polymeric materials, includes: a hollow extrusion cylinder, having an inlet for receiving pellets of polymeric material, and an outlet for expelling molten polymeric material; an extruder screw connected to a motor to rotate inside the extrusion cylinder and to move the polymeric material from the inlet to the outlet; heaters coupled to the extrusion cylinder; a sensor system configured to measure values of a recipe parameter and of a monitoring parameter; a processing unit, programmed to store a target value for the recipe parameter and to perform a feedback control to bring the recipe parameter to the target value and to keep it at the target value.

A material delivery device includes: a plasticizing unit including a screw; a nozzle through which a plasticized material is delivered to outside; a communication flow path provided between the screw and the nozzle and through which the plasticized material flows; a pressure detection unit including a first cylinder coupled to the communication flow path, a rod inserted into the first cylinder, and a pressure sensor disposed with the rod separated from the communication flow path, in which the rod is configured to receive a pressure of the plasticized material in the communication flow path at a first end surface facing the communication flow path, and transmit the pressure to the pressure sensor through a second end surface opposite to the first end surface; and a rotation regulation mechanism configured to regulate rotation of the rod about a central axis along a longitudinal direction of the rod by engaging a first engaging portion provided on a side surface of the rod and a second engaging portion to be engaged with the first engaging portion.

An injection molding apparatus that employs a stationary plasticating screw relative to feed port, non-reciprocal helical plasticating screw housed within an inner barrel that is coupled to a plunger head assembly, drive housing, motor and injection cylinders that is housed within an outer barrel/pressure vessel that conveys, melts, homogenizes and pumps polymeric plastic material precisely and efficiently along One axis. The helical plasticating screw is fixed in relative position within the inner barrel so that the material feed opening of the inner barrel and helical plasticating screw are aligned to accept pellets, powder or liquid of polymetric substance. The inner barrel is fixed to a plunger head assembly on the distal end that is housed within a pressure vessel with close proximity between the outside diameter of the plunger head and the inside diameter of said pressure vessel that upon screw rotation transfers polymetric material through the center passageway of said plunger head opening a normally closed one-way shut-off mechanism into said pressure vessel precisely for future displacement of polymeric mass into a mold or other. The apparatus and process of feeding, melting and injecting Polymeric material all occurs on one axis.

Disclosed is a method of adjusting a motion profile of a shooting pot plunger for use in a molding system, the shooting pot plunger slidably movable within a shooting pot cavity, the method comprising: sensing a characteristic at a predetermined location in an injection circuit of the molding system; determining that the sensed characteristic is outside of a threshold range; adjusting the motion profile of the shooting pot plunger to account for determining that the sensed characteristic is outside of the threshold range; and storing the adjusted motion profile in a memory.