Alpine 3 layer extrusion line
|Machine||Alpine 3 layer extrusion line|
|Type of extruder||Blown|
|Number of layers||3|
|Diameter die||250 mm|
|Lip opening||1,5 mm|
|Diameter screw(s)||50 – 50 – 65|
|L/D ratio screw(s)||30D|
|Material & Min – Max thickness||HDPE / COEXT LDPE – HDPE|
|Max. film width||1800 mm|
|Min. – Max. film thickness||8 – 80 µ|
|Rewind type||1000 mm|
|Rotating, which part||Platform|
|Dosing unit||4 components|
|Corona treater||Yes, R/V|
|Tower construction included||Yes|
|Machine can be seen in production?||Yes|
Alpine // Hosokawa Alpine
The first steps of Hosokawa Alpine lay in Germany where in 1898 the first mechanical workshop opened. From the 50’s onward Alpine started in the sector of plastics. Nowadays the machines and systems are sold on a global scale. Hosokawa Alpine has all their plants in Germany. Alpine is specialised in the design and manufacture of systems for producing and finishing blown film.
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.