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F.I.F.O. INJECTION SYSTEMS
Machinery is based on the proven First In – First Out (FIFO) principle. Direct injection via a screw cylinder, piston cylinder and nozzle ensures a short injection path. Top, bottom as well as horizontal injection versions are available from 45T to 400T.
The maximum shot volume amounts to 6000 cm³. The screw is directly driven by means of a slow turning hydraulic motor, therefore the speed is infinitely variable and suitable for all types of material.
The injection unit is highly efficient due to the high plasticizing rate and the low energy consumption. Curing of the rubber in the nozzle of the injection chamber is prevented by the presence of a cooling zone.
Special characteristics:
- Screw with special intake toothing and compression zone
- Plasticising cylinder with intake pocket and effective temperature regulation
- High injection pressure which continues into the mould without mentionable pressure loss due to the nozzle design.
- Back pressure control
- Controlled temperature in the intake zone
NON RETURN VALVE
The special feature of the non return valve is the short closing movement which ensures high precision of the short volume. This non return valve is activated by the injection pressure. The design of the check valve ensures that the passing rubber mass creates a constant purging effect in the injection chamber thereby preventing any rubber residue.
The non return valve is designed for long life.
EASY CLEANING
Cleaning of the injection unit is carried out just before machine switch-off or at the change of compound. Any residual material is purged into the injection chamber and this rubber cushion is allowed to cure after switching off the cooling system. Then, after a short dwelling time, the cushion remains on the check flow cap while the injection piston is driven back into the cleaning position. This small amount of remaining rubber is easily removed manually.
OPERATORS CONTROL PANEL
Machines are equipped with a state-of the art PLC (Programmable Logical Controller) for optimal process control. The PLC ensures high control and therefore process precision. Storage of necessary control data is standard. The PLC is designed to be operator friendly and is highly reliable in an industrial environment.
The operating panel features as standard:
- High resolution VGA-display, 26 lines, 80 characters each
- Internal 3.5” floppy drive (capacity 500 mould data sets)
- Shuttle wheel for cursor functions
- Friendly operation through menu and softkey technics
- Two-way setpoint selection (numerical and teach-in)
- Operator level authorization
- Automatic 2-channel timer for mould heating (weekly; time & date)
- Clear alarm indication on display
- Cycle step display on all pages
- Measured values in physical units
- Limit checks on entered set points
- Extensive controls and auxiliary functions
- Fault analysis and diagnostics in manual and automatic mode
STANDARD FEATURES
- Variable pump with proportional pressure and flow control
- Hydraulic safety interlock for clamp
- Light screens at product take-out
- Heating platen with T-slots
- Asbestos free insulation platen
- Heating/cooling unit for plasticizing cylinder (water)
- Cooling zone at material intake and injection pot
- Adaptive temperature control of 6 zones
- Controlled 3-step injection
- 3 speeds for opening and closing movement
- Mould protection phase with monitoring
- Injection compression cycle
- Ventilation cycle (0-99 strokes)
- Temperature monitoring
- Monitoring of electric current to heaters
- Strip intake control
- Cycle material decompression by means of lifting of the injection unit
- Pre-cycle purging and post-cycle purging
- Alpha numeric input of product and compound number
- Extensive operation and production data recording (if required)
- Alarm message and cycle step display in clear text (highlighted)
- Status test for trouble shooting
- Operation hour counter
- Cycle counter, Shift counter
- Display of actual values of: cycle time, unload time, remaining curing time
- Display of injection speed, injection time, recharge time, screw speed
- “Teach-In” – function for clamping unit and ejectors
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