The Varistar was designed to be the most accurate and flexible Star Screen available, due to the unique ability to vary the gaps between the Star Shafts whilst the machine is in operation. Coupled with variable speed drives, this gives the operator the ability to set the shaft speeds to suit the throughput, and the shaft gap to suit the sizing required within a range of 10-40mm on a standard star bed.
Other screening sizes can be accommodated by the addition of spacers between the stars to increase the gaps, or the addition of star collars to reduce the gap between the stars.
The standard star is a 260mm diameter component manufactured from polyurethane, but there are several options depending on the screening size required and the type of material being processed.
* Standard machines are supplied on a Universal Mounting Frame and can be specified to include Electric or Hydraulic Controls.
* A 2.5m long oversize material discharge conveyor is standard equipment, extra conveyors for Fines Collection can be specified.
* Shaft Bearings are sealed and are maintenance free.
* Hydraulic tilt to incline the discharge end of the machine is available as an option.
The Adjustment Mechanism is operated by a simple electric switch on the Control Panel enabling the correct screening size to be chosen for each batch.
Thus, a morning operation might be screening Compost at 10mm whilst in the afternoon the machine could be switched to 30mm – in seconds. See the video on this website to demonstrate this action.
The Varistar Screen is designed to be ultra-reliable. Each Star Shaft is driven by its own independent motor, and the motors are grouped in sets of six per Inverter Speed Control.
If one motor were to fail the machine would just keep operating as the shafts either side of the failed motor would continue to rotate, and the machine would keep screening until such time as a maintenance break could be taken.
As a standard fitment the Varistar includes a 2.5m long Discharge Conveyor which carries the oversize material away either to drop into a bay or onto a conveyor system.
This Conveyor is mounted on the last row of stars and so traverses in and out when the Varistar is adjusted. All bearings are sealed for life so there is no required maintenance on this machine other than the remove any obstacles and to keep it clean.
We produce a comprehensive range of standard build screens and materials handling equipment, which can be supplemented by specially designed bespoke equipment, purpose built to customer requirements.
Formed to service the requirements of the recycling industry, ProStar offer a range of high quality machines for static and mobile applications, plus a range of Conveying Equipment.
Including C&D, C&I, Biomass and Wood Waste, Road Sweepings and Gully Waste to name but a few. Our screens are also used in industrial processes.
From a basic Star Screen for integration in to an existing line, to a complete turn key solution. Versatility, Adjustability, Low Maintenance, Low Noise Level & Positive Drive.
