Fresco Systems offer both volumetric (product flow rate is by volume and set over a given time) and gravimetric (product flow rate is by weight and controlled using loadcells) types of metering screw feeders, with throughputs ranging from 1.76 litres/hr up to 13,650 litres/hr.
The crucial factor in achieving accuracy is consistent product bulk density by proper design and selection of an agitator in the conditioning zone above the screw auger. The agitator de-aerates and densifies the product to a uniform density and breaks any bridges, preventing hold up in the hopper.
This combined with a vast selection of screw sizes and types allows a wide cross-section of materials to be fed very accurately. Volumetric accuracy of ±1% to ±2% and gravimetric accuracy’s of ±0.25% to ±1% depending on the material can easily be achieved.
Weigh platforms fitted under the standard feeder linked to a batch controller provide accurate loss in weight feeding. Two-way RS 232 serial ports will send and receive signals from other plant control systems.
An easily removable front section provides access for cleaning and screw changes.
Standard Features of Metering Screw Feeders:
- Integral gear motors direct drive.
- Solid stub shafts
- Safety switch
- Minimal external ledges
- Lip type shaft seals
- Fully welded construction
- Removable end plate for ease of servicing flights
- End discharge
- Operation and maintenance manuals
- Safety grills
- Key-type safety switches
Metering Screw Feeders Materials of Construction:
- Carbon steel
- 304 Stainless steel
- 316 Stainless steel
Other Options Available for Metering Screw Feeders:
- Motor starters
- Abrasion resistance liners
- Sanitary or industrial finish
- DIP motors
- Air purge seals
- Custom designs
- Heating or cooling jackets
- Semi-cylindrical body
- Side discharges
- Solid screw designs
- Weigh platforms