Steel plate with control-piston intake body attached to stationary platen

Position and configuration of the ancillary injection unit optional H-, L, V-position

Control of the molten mass current of main and secondary component only via two pressurized pistons

Integrated shut-off nozzle function – spring corpus presses piston against interior sealing surface of the nozzle

Starting up of the nozzle towards sprue bush of the mold through main injection unit (horizontal), simultaneously tautening of a spring corpus

Hot-cold-separation at sprue bush of the mold due to the spring corpus pushing the nozzle back into its home position during the shut down of the horizontal injection unit

Injection of the skin component: Both pistons are moved due to the melt pressure

Injection of the core component: Only the piston on the “right” is moved due to the melt pressure, the molten mass runs through the bore inside the “left” piston

Simultaneous injection of the two molten masses: The piston on the “left” takes up an intermediate position (mottling process and transition period during the injection in between skin and core material – no melt flow standstill

At the end of the injection/ holding pressure phase the melt pressure is down to zero, the spring corpus pressures the pistons back into their initial position and the nozzle is shut