Principle of single screw extruder

The effective length of a single screw is generally divided into three sections.

The effective length of the three sections is determined according to the screw diameter, pitch and screw depth,

which is generally divided according to one-third of each.

It is believed that the solid material can not be transported through the extrusion channel as long as the solid material passes through the extrusion channel,

which is similar to the theory that the solid material can not be transported through the extrusion channel in the past.

The second section is called the compression section. At this time, the volume of the screw groove gradually decreases from large to small,

and the temperature should reach the degree of material plasticization. The compression generated here is compressed from the third conveying section to one here,

which is called the compression ratio of the screw - 3:1. Some machines also change, and the materials that complete plasticization enter the third section.

The third section is the metering section, where the material maintains the plasticization temperature,

but the melt material is transported accurately and quantitatively like the metering pump to supply the machine head.

At this time, the temperature cannot be lower than the plasticization temperature, which is generally slightly higher.