Model-MK3B – 12.7 mm (1/2 inch) Twin Screw Extruder
Bench top machine – specifications  & info

Counter Rotation – closely intermeshing counter rotating screw design

Excellent Mixing

Minimal Material Waste/Minimal Free Volume

Minimal Pulsating

This equipment has been specially designed for diverse and precise mini extruding processes.

With the capabilities to achieve the maximum chemistry characteristics with minimum batch quantities.

Special attention has been made to ensure precise smooth output motion of the extrusions, which is particularly important when performing low volume output rates for single fibre/strand extrusions etc.

Optional accessories available e.g. Melt Pump and Tooling.

An example of different screw elements.

Features

  • Modular screw elements (Flexibility via User configurable screw element design)
  • Counter-rotation
  • Maximum pressure- 100 bar
  • Maximum output- 1500 ml/Hour
  • Maximum temperature- 375 degrees Celsius
  • Rpm- 0 to 350
  • Dimensions: Footprint – 600mm x 1000mm x 450mm (height from base to top of barrel)
  • Minimum batch size- 5 cc (20 cc is better)
  • Touch screen controls
  • Modular counter rotating screw elements (Flexibility via configurable screw design).
  • Maximum pressure- 100 bar
  • Maximum output- 1500 ml/Hour
  • Maximum temperature- 375 degrees Celsius
  • Rpm- 0 to 350
  • Dimensions: Footprint – 600mm x 1000mm x 450mm (height from base to top of barrel)
  • Minimum batch size- 5 cc (20 cc is better)
  • 10 individually controlled heat zones on the Barrel (controlled via touch screen)
  • 5 axillary Tooling heat outlets (controlled via touch screen)
  • Note; the extruder also includes built in controls and motor Drives for 3 axillary devices. 2 for the option of running 2 individual Dispensers & 1 for running either a Melt pump or another device (E.g. Die Face Cutter) all of which are displayed & controlled via the touch screen
  • Touch screen controls, includes;
    Optional operation function- Run via speed or run via pressure
    Pressure reading display
    Torque reading display
    Speed reading display
  • Superior mixing when performing minimum material outputs rates (processing fibres etc.)
  • Multiple inlet ports for multiple purpose operations (liquid, gas, powder or vacuum)
  • Superior sealing of barrel and screw drive system
  • Servo motor drive system – screw speeds 1 to 350 rpm (Constant Torque)

Product details

Product Design Brief

Fully Intermeshing Counter Rotating Screws were best suited for the mini twin screw extruder for the following reasons below.

Co-rotation screws versus Counter-rotation screws for mini lab-scale extruders

  • Co-rotation! (Intermeshing)
    Generally speaking co-rotation is most favourable in today’s larger commercial extrusion machines, due to good mixing and high materials output. Co-rotation is more popular in a production sense due to the high outputs volumes. However when scaled down to laboratory sizes, there can still be a considerably large free volume, requiring more material to be able to perform the process. Noting that small screws have a low wingtip speed, this can reduce the mixing ability of the screws. Finally there is the pulsing pressure created, meaning additional devices such as a melt pump, are needed to ensure constant pressure and flow to extrude accurate and consistent filaments.
  • Counter-Rotation! (Intermeshing)
    Generally speaking counter-rotation has a higher shear/mixing action and the materials pass through the barrel slower with a lower materials output. The resulting geometry of the counter-rotating intermeshing screws reduce the free volume significantly and the amount of material needed to be able to process. These features allow for significantly improved mixing profiles/techniques, and improves the capability of adding additional materials to the extruder flow through the additional intake ports. The reduced free space volume, plus the counter-rotating screws also reduce the pressure pulsing to the point that often an additional melt pump is not required to create accurate extruded filaments.

Up scaling to commercial output processing

We believe up scaling the extrusion process characteristics from a mini counter rotation extruder to a commercial sized high output Co Rotation extruder is not a problem, as the resulting mixing profiles are similar.

More product images

Dimensions

Width x Depth x Height: 1000mm x 600mm x 450mm (note: height from barrel top to base)

Power source: 380-415 VAC 3Ph @ 10A (supplied with a 20A plug)

Weight: 80kg not including options

Top view of twin extruder

 

MiniMini Lab Extruder – Inside View of Split Barrel

Mini Lab Extruder – View of Melt Pump Setup