The strong point of REP injection: it simply has no weak points.
The expert's opinion
« The Y-structure: a proven principle, optimized on the G9. Separating the plasticizing and injection functions, in combination with the control system, gives the entire injection unit unrivaled accuracy and regularity throughout the injection process.
For the same volume, the REP injection technique, with separation of the plasticizing and injection functions, means an injection plunger diameter 25% smaller than with the FIFO technique. For the same injected volume, the REP injection unit is twice as accurate as a FIFO injection unit. Metering accuracy is further improved by programming the extruder to slow down before the set point is reached. »
Hervé Revel, Head of REP's Industrial and Technical Division
From feeding to injection, the right answers at every key area
Preventing feed strip rupture, means preventing production hold-ups.
Feed: Intake chamber with a helicoidal sleeve.
Progressive start and stop of the extruder to prevent any risk of feed strip rupture.
Temperature control of all critical areas means guaranteeing the quality of the parts.
Rigorous temperature control through-out all phases of the mixing process.
Material temperature sensor at the extruder outlet for perfect self-heating control.
Bringing the material to the ideal temperature means saving cycle time.
A regulator fitted to the injection unit, with 2 independent circuits and with rapid response times, is used to homogenize the temperature and ensure accurate regulation.
Perfect shot size control means avoiding material waste and manual deflashing.
Shot size metering accuracy is ensured by a check-valve with a short consistent stroke and a perfect seal.
Material flow with low restrictions means preventing spoiled and stagnating compounds.
The shape of the valve ensures an effective sweep and perfect renewal of the material with each cycle. The direct injection runner reduces head pressure drops.
Easy extruder removal means reduced cleaning time.
In the case of compounds with widely varying viscosity, the extruder-uncoupling device ensures rapid cleaning of the screw and the check-valve area.
Controlling expansion means a longer life.
The traverse casting, "free"-mounted on the extruder-side absorbs thermal expansion and adjusting rings are used to ensure accurate centering of the injection unit.
Adapting to special cases means access to all types of production.
For special cases,injection units can be produced for the injection of low viscosity or liquid silicone and thermoplastic elastomers using a 30-litre silicone stuffer.
Want to learn the basics about injection molding? See REP's Tutorial
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