Inglass-HRSflow has developed the MTS (MUltiTechSpring) injection moulding system which is mainly characterized by simplicity and compact size. The operating principle is simple since air pressure, oil or mechanical movements are not required to drive the shutters. When the melt reaches a set pressure the shutter is automatically opened, and the melt thus flows to the gate. The pressure overcomes the force exerted by the spring and, through a keyed ring on the shutter itself, keeps this latter lowered in the open position. Once the injection ends the spring brings the shutter back to the closed position, which "shears" the residual material at the gate.