N.EXT screw diameters 30 – 45 – 75 – 90 mm

WM Thermoforming Machines offers new extruders line N.EXT including the following screw diameters:

30 – 45 – 75 – 90 mm, the L/D (length/diameter) ratio is 36.

The output capacity ranges from 180 to 900 Kg/h for Polypropylene material. All the extruders are single screw, operated by AC motor water cooled as standard supply.

The most important advantages of WM N.EXT extruders may be summarized as follows:

  • Higher productivity
  • Energy saving (less cooling and less installed power)
  • Wear reduction
  • Very good self-cleaning
  • High percentage of regrind possible

Vertical roll stack

WM has designed a 3-rolls vertical stack calender to ensure:

  • Low bending of the rollers
  • Low thickness tolerance
  • Rigid frame and roll constructions
  • Individually designed temperature control systems
  • Highly accurate single drivers for each roll

Thermo-calender unit

The WM thermo calender unit stabilizes and optimizes the PS sheet temperature before entering the forming area. The calender is built on a strong steely carrying structure.

There are two kinds of movements:

  • continuous motion
  • intermittent motion

Continuous motion is used at the production start-up for sheet lead-in. Intermittent motion is used within the normal sequence of production run.
High energy efficiency as heating ovens are not necessary.