Yei 3 layer blown film extrusion line
|Machine||Yei 3 layer blown film extrusion line|
|Machine manufacturer||Yei Machinery|
|Type of extruder||Blown|
|Number of layers||3|
|Diameter die||200 and 250 mm|
|Lip opening||1,8 and 2,2 mm|
|Diameter screw(s)||55 mm|
|L/D ratio screw(s)||28:1|
|Material & Min – Max thickness||LDPE, LLDPE, HDPE
25 – 250 mic
|Max. film width||1020 mm|
|Max. output||100 kg/hour|
|Max. rewind reel diameter||600 mm|
|Number & sizes airshafts for winder||4 x 3"|
|Type of screen changer||Manual|
|Rotating, which part||Take off|
|Dosing unit||Auto feeding, mixing off line with the mixture|
|Tower construction included||Yes|
|Special characteristics||Can run nylon in outer layer|
|Machine can be seen in production?||Yes|
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.
- blown film