Abstract: An injection apparatus of a plunger type for injecting reinforced materials such as BMC is of a single barrel type or a double barrel type comprising a rotatable plunger disposed in the barrel. A check valve means for preventing a back flow of the materials in a metering process is provided such that it is closed when the plunger is actuated to move axially for injection.

Abstract: An injection apparatus of a plunger type for injecting reinforced materials such as BMC is of a single barrel type or a double barrel type comprising a rotatable plunger disposed in the barrel. A check valve means for preventing a back flow of the materials in a metering process is provided such that it is closed when the plunger is actuated to move axially for injection.

Abstract: A plasticating control apparatus for an in-line screw type injection machine, including: a resin pressure sensor for detecting as an electrical signal pressure of a molten material at a distal end of a heating cylinder during plastication; means for directly converting the rotational speed of an electric motor to reciprocal movement of a hydraulic piston for driving a screw; and a control circuit for receiving the electrical signal from the resin pressure sensor and supplying the control signal to the electric motor in accordance with the electrical signal, the control signal supplied from the control circuit to the electric motor being adapted to control the rotational speed of the electric motor and hence a backward speed of the screw such that the pressure of the molten material at the distal end of the heating cylinder is not a negative pressure but substantially zero kg/cm.sup.2.

Abstract: The severing apparatus comprises a horizontal frame, a first pair of a lower stationary die and an upper swinging die, and a second pair of a lower movable die and an upper movable and swinging die. Each die is formed with a semicircular recess for receiving a billet. The first and second pairs are juxtaposed on the horizontal frame in the axial direction of the recesses. The second pair is slidable with respect to the first pair in the horizontal direction perpendicular to the axial direction of the recesses for severing the billet. The upper swinging die of the first pair and the upper movable and swinging die of the second pair are swung with respect to the lower stationary die and the lower movable die for receiving the billet.