Automatic and Continuous screenchanger
John and Peter Kalman invented and patented the AutoScreen automatic,
continuous screenchanger using filter screens in the form of woven steel ribbons
in the 60s. Since that time the AutoScreen has been manufactured and
used by thousands of plastic processors worldwide.
Today's AutoScreen Next Generation has been deeply renewed meeting all the new needs of the plastic industry.
Thanks to a totally new internal design as well as a new advanced control panel, today we are talking about one of the finest screenchangers for the production of film (blown and cast), sheet, pipe, tubing, profiles, tape, filaments, wire coating, foamed extrusions and other products, such as blow molded parts, which benefit from uninterrupted extrusion and steady process conditions. With no electric motors or hydraulics, the only moving part in the AutoScreen is the filter itself.
Our screenchangers are very compact. They can easily fit in the crowded space around extrusion and blow molding dies.
The AutoScreen has no motor, gearbox, hydraulics or pneumatics and has no moving parts at all, except for the screen itself, so that there is virtually no wear.
With no replacement of screen packs and breaker plates we have eliminated down time and operator dependency associated with slide plate and rotary type
screenchangers.
Control System
The standard control system is an advanced plc based system, powerful and user friendly, with touch screen user interface, and can move the screen at a wide range of speeds to suite the contamination level. Both timer and pressure logic of controls can be used:
- Timer Controller: the timer control simply moves the screen at fixed time intervals.
- Pressure Controller: for unstable level of pollution, a pressure based control is preferred. A digital pressure controller maintains the user-set pressure differential or inlet pressure. When the selected targeted pressure differential or inlet pressure has been reached, the AutoScreen introduces new screen segment. This arrangement ensures stable process conditions even when using materials of varying quality. It also facilitates economic screen consumption.
- Dual Control: the screen advance can be triggered by both time expire and pressure threshold.
- Manual control: manual override is possible.
- Two additional zones, usually for inlet and outlet,can be controlled.
From the control panel you can monitor all the main Screenchanger functional parameters:
- AutoScreen downstream and upstream pressure.
- Temperature and set points of the heating zones.
- Power consumption of the heating zones.
- Interval timers.
The controller's touch screen panel allows for a very simple set-up of all the working parameters.
The system configuration parameters pages are accessible only by password.
The control system is multi language; it is possible to select the request language
from the configuration page.
The control system can be integrated with the extruder:
- The AutoScreen heating can be switched on directly by the extruder.
- AutoScreen can communicate with the extruder to confirm that it is up to temperature and is ready to start-up.
| Technical data | |
|---|---|
| Processing | Continuous flow, automatic |
| Type of material | Steel |
| Diameters of filtering unit | From 35 to 200 mm (1-1/4" to 8") |
| Heaters | Cartridges |
| Material status | Medium pollution |
| Operating temperature | Up to 350° C (662° F) |
| Pressure | Up to 700 bar (10.000 psi) |
| Hourly capacity | Up to 2500 kg/h (4000 pounds) |
| Machined material | Polymer HDPE, LDPE, LLDPE, PP, ABS, PET, PS, Nylon, etc. |
| Resulting product | Process Film (Blow), Sheet, Pipe, Tubing, Profile, Tape, Foamed extrusion, Wire coating,Thermoformed products, Expanded sections, Orientated tapes, twines, Rope, Tubing, Filament, Yarns, Master batch, etc. |
