Metering Screw Feeders

Principle and Operation

In response to specific customer requirements across the spectrum of industry, Rospen Industries have developed their successful range of Metering Screw Feeders to encompass special designs that are both industry sector and material specific. Whatever the feeder type the result is the continuous metering of all materials from flushing powders to fibrous particulate products at a constant volume to high accuracies. Based on the benefits of the Rospen, Metering Screw Feeder principle, one such machine is the Multi Agitator Feeder.

Discover our Metering Screw Feeders

Multi Agitator Feeders
Single Screw Feeders
Twin Screw Feeders
Special design

Multi Agitator Feeders

Designed with a very large inlet area of 0.25 sq.m to allow the fitting of a large outlet hopper. Also incorporated are two, full length independently driven twin shaft agitator product conditioners, which continuously sweep the conditioning chamber.

The very active live hopper outlet feature allows the feeder to handle difficult products, which may bridge, stick or rat hole, such as cooked cereals. The agitators can be wired to counter-rotate or co-rotate to suit the application and a speed inverter can be fitted to allow different conditioning rates.

Single Screw Feeders

Principle and Operation
Metering Screw Feeder is also known as Volumetric Feeder is designed to continuously meter all materials from flushing powders to fibrous particulate products at a constant volume to high accuracies. The basic feeder consists of a Rospen designed, unique tapered conditioning chamber, complete with a slow rotation agitator and variable control functions, which provides constant or intermittent operation, to suit the nature of the products being handled.

Product is directed into a variable speed metering screw, which runs completely and evenly filled and is linked to an electronic feedback drive ensuring accurate speed holding under all load conditions.

Resulting in the material being metered out at a constant volume of between ±1% to ± 2%. For output capacities see the choice of feeder section below or follow the link to the feeder sizing tables.

Choice of Feeder
The selection of the correct type of feeder from the extensive Rospen range is determined primarily by the type and specification of the material to be handled. Both single and twin screw feeders are equally as efficient, with the single screw mechanically simpler and therefore more economical, and are the prime choice where practical. Both units share the following features and benefits;

  • Large inlet eliminates material bridging.
  • Tapered Conditioning Chamber de-aerates fluidising powders or livens cohesive materials ensuring screw runs completely and evenly filled.
  • Suitable for use with very fine to coarse, or fibrous, particulate products.
  • Easily removable front cover provides a safe and quick access for cleaning.
  • Instant release of feed screw without shaft seal disturbance.
  • Ideally suited to industries that require rapid clean down and product changes.
  • Moving parts kept to a minimum with no drive chains or couplings, resulting in low maintenance requirements.
  • Output Range – 1.0kg/hr to 100,000 kg/hr.

Twin Screw Feeders

Metering Screw Feeder is also known as Volumetric Feeder is designed to continuously meter all materials from flushing powders to fibrous particulate products at a constant volume to high accuracies. The basic feeder consists of a Rospen designed, unique tapered conditioning chamber, complete with a slow rotation agitator and variable control functions, which provides timed on /off settings, constant or intermittent operation, to suit the nature of the products being handled.

The product is directed into a variable speed metering screw, which runs completely and evenly filled and is linked to an electronic feedback drive ensuring accurate speed holding under all load conditions. Resulting in the material being metered out at a constant volume of between ±1% to ±2%. For output capacities see the choice of feeder section below or follow the link to the feeder sizing tables.

Choice of Feeder
The selection of the correct type of feeder from our extensive range is determined primarily by the type and specification of the material to be handled. Both single and twin, screw feeders are equally as efficient, with the single screw mechanically simpler and therefore, more economical and are the prime choice where practical. Both units share the following features and benefits;

  • Large inlet eliminates material bridging.
  • Tapered Conditioning Chamber de-aerates fluidising powders or livens cohesive materials ensuring screw runs completely and evenly filled.
  • Suitable for use with very fine to coarse, or fibrous, particulate products.
  • The easily removable front cover provides safe and quick access for cleaning.
  • Instant release of feed screw without shaft seal disturbance.
  • Ideally suited to industries that require rapid clean down and product changes.

Special Designs

In response to specific customer requirements Rospen can also provide;

  • Variable geometry; pitch, core thickness, flight diameter
  • Ribbon type
  • Reversing type
  • Centerless auger
  • Specialist coatings; tungsten carbide, PTFE/li>
  • Specialist materials; hardox, duplex/li>

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