Comet 3 layer extrusion line

Machine Comet 3 layer extrusion line
Reference number E17004
Machine manufacturer Plastproject re di Luca
Model Comet S674
Type of extruder Blown
Year 2000
Number of layers 3
Diameter die 230 mm
Lip opening 1,2 mm
Diameter screw(s) 60 / 80 / 60
L/D ratio screw(s) 30D / 29D / 30D
Material & Min – Max thickness Bi-axially oriented shrink films
13 - 25 micron
Max. film width 1700 mm
Max. output 200 kg/hour
Rewind manufacturer Clarus Films and Slitec
Rewind type Back-to-back
Contact & Gap
semi automatic
Max. rewind reel diameter 500 mm
Number & sizes airshafts for winder 4 x 3"
Type of screen changer Manual
Rotating, which part Die
Dosing unit No
Thickness measurement Yes, Contrex
Inline slitting Yes
Tower construction included Yes
Manuals available Yes
Other information Machine is auctioned by our partner
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Subject to unsold. Although believed to be correct, the machine specifications and lists supplied are based solely upon those provided by the original owners.

Extrusion in the flexible packaging industry can roughly be devided in three kinds of extrusion: blown film extrusion lines, cast film extrusion lines and BOPP extrusion lines.

Blown Film Extrusion
Blown film extrusion is the most common technology to produce plastic film. Blown film extrusion is typically carried out upwards vertically.
Film is made out of polymer material. These polymeres are generally in the form of granulate. This material is melted and then forced or extruded through a die. Air is blwon thourgh a hole in the center of the die. This pressure causes a bubble. This bubble is a thin layer of film. The film is pulled upwards from the die to cool down and winded on the a roll.
Blown film extrusion exists in various layers, the more layers the thicker the film.  The process with more layers is called coextrusion.

  • 3 layer
  • Extrusion
  • comet
  • blown