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:
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Faster recovery in that both materials plasticize simultaneously
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Lower cost because there is only one screw rather than two
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The ability to switch to single material molding on the fly
TWINSHOT CO-INJECTION PROCESS
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Core Material (Recycled Resin)
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Skin material (Virgin Resin)
Why is TWINSHOT Unique?
TWINSHOT is easy to install
In most cases, installing TWINSHOTcomponents is no more complex than a conventional screw and barrel changeover.
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No new hydraulic requirements
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No new software
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No new gate valve
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No new manifolding
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No external controls or support equipment
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No additional power requirements
TWINSHOT is easy to retrofit on conventional machines
TWINSHOT is popular with major national and international OEMs and is available on many models of new machines. However, it can also be easily installed on your existing molding systems. Retrofitting for TWINSHOT involves simply replacing your barrel and screw, and mounting an auger feeder to control the ratio of materials. That’s it. It couldn’t be simpler. In most cases a retrofit can be accomplished in a single shift, once the pre-engineered kit is received. Maintenance personnel with experience in replacing screws and barrels will be able to perform a TWINSHOT conversion with similar ease.
TWINSHOT….
Proof Through Performance!
TWINSHOT Gallery
of Successful Applications
There
are a number of other reasons to consider converting
a standard injection moulder to Twinshot.
The
Twinshot co-injection technology enables moulders
to:
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Reduce resin costs by 25 percent….. or more
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Make us of off-spec and regrind materials
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Encapsulate a lower-cost resin within a higher-cost UV inhibitor or colorant
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Use less energy
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Enjoy simpler set-up and lower operational complexity
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Reduce maintenance cost
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Use less floor spacing
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Use a nozzle configuration that is completely standard
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Easy convert back to single-material mode (simple supply the same material to both feed hoppers)
