Macchi blown film extrusion line
|Machine||Macchi blown film extrusion line|
|Type of extruder||Blown|
|Number of layers||3|
|Lip opening||2,2 mm|
|Diameter screw(s)||65 - 80 - 65|
|L/D ratio screw(s)||30D - 30D - 30D|
|Material & Min – Max thickness||LDPE, LLDPE, BLENDS HDPE, MDPE, mLLDPE
20 – 200 micron
|Max. film width||2200 mm|
|Max. output||450 kg/hour|
|Rewind type||Back to back|
|Max. rewind reel diameter||850|
|Dosing unit||Yes, Doteco|
|Thickness measurement||Yes, Kundig|
|Edge guide(s)||Yes, E&L (2015)|
|Corona treater||Yes, Ferrari & Benelli
|Tower construction included||Yes|
|Machine can be seen in production?||Yes|
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