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TWINSHOT Co-injection technology enables a conventional machine with a single barrel and single screw to inject two materials in a single shot with one material totally enclosing the other. During injection, the well-known principle of fountain flow causes one material to cool against the mold walls and the other material to form the encapsulated core. A three-layer Sandwich construction is produced.
Unlike a conventional co-injection machine with two barrels, TWINSHOT is remarkably easy to use. Other than the screw recovery style the machine works exactly the same as a standard injection molder. In most cases TWINSHOT can be controlled by the same software that comes with the standard machine.
The ratio of materials is controlled by an external auger feeder mounted to the secondary hopper. Because this design requires no changes to the screw drive mechanism, retrofitting to any model of existing injection moulding machine is simple. Further advantages of this version include:
- Faster recovery in that both materials plasticize simultaneously
- Lower cost because there is only one screw rather than two
- The ability to switch to single material molding on the fly