At Husyca we are suppliers of plastic manufacturers who have extruders. Plastic extrusion is a continuous, high-volume manufacturing process in which a thermoplastic material, whether in the form of powder, pellets or granules, is homogeneously melted and then forced out of the forming die by pressure.
In screw extrusion, the pressure comes from the rotation of the screw against the barrel wall. As the molten plastic passes through the die, it takes the shape of the hole in the die and exits the extruder. The extruded product is called an extrudate.
A typical extruder consists of four zones
feeding area
In this zone, the depth of passage is constant. The distance between the major diameter at the top of the helix and the minor diameter of the screw at the bottom of the helix is the depth of the helix.
Transition or compression zone
In this area the depth of passage begins to decrease. In effect, the thermoplastic material is compressed and begins to plasticize.
mixing zone
In this area, the depth of the flight is again constant. To ensure that the material is completely melted and mixed evenly, there may be a special mixing element.
dosing area
This zone has a lower passage depth than the mixing zone, but it remains constant. Furthermore, in this area the pressure pushes the melt through the molding die.
The melting of the polymer blend is due to three main factors
Heat transfer
Heat transfer is the energy transferred from the extruder motor to the extruder shaft. Furthermore, the melting of the polymer is affected by the screw profile and the residence time.
Friction
It is produced by the internal friction of the powder, the screw profile, the screw speed and the feed rate.
extruder barrel
Three or more independent temperature controllers are used to maintain the temperature of the kegs.
