Netplasmak produces Blown Film Machines for HDPE (High Density Polyethylene) and LDPE (Low Density Polyethylene) materials in different film widths. These film rolls are used for different purposes such as bag making, plastic greenhouse covering and shrink wrapping.

The extruder is a machine used to form polymer in a continuous manner. The raw material in the form of pellets is placed in a hopper that feeds the barrel. Barrel has a screw in it, driven by a motor and a gearbox. The screw transports and mixes polyethylene along the length of the barrel, which is heated to a temperature sufficient to melt the polymer. There are heaters and thermocouples along the barrel and on the die. Controllers that use thermocouples for feedback regulate the temperature along the barrel. At the end of the barrel, the material is forced out, through an orifice. Melt filters in here hold back impurities carried into the extruder with the plastic pellets and prevent the die from becoming blocked or damaged. Polyethylene film is usually produced by blown film extrusion. During blown film extrusion, the PE melt is forced through an annular die. Spiral mandrel dies with vertical orientation of the spirals are used for the production of polyethylene films. The bubble that is formed is inflated with air and hauled off at a higher speed than the die outlet speed. A current of air intensively cools the bubble. The bubble is then collapsed, trimmed if necessary, and rolled up using a suitable winding system. Polyethylene film rolls are then cut to the specified length. Therefore for manufacturing polyethylene bags, an extruder and a cutting machine are required.

*Subject to modification in case of further development