What is the function of barrel in extruder?

The Extruder screw barrel is a key component of an extruder in a plastic processing machine. The primary function of the barrel is to contain and transport the plastic material from the feed zone to the die zone, where it is shaped into the desired form.

The barrel is typically made of a high-strength, heat-resistant metal such as steel, and is divided into several zones, each with its own temperature control system. As the plastic material is fed into the extruder, it is heated and melted by the heat generated by the barrel's heating elements. The plastic material is then compressed and transported along the barrel by a rotating screw or screws, which also help to mix and homogenize the material.

In addition to its transport and heating functions, the barrel also helps to create pressure within the extruder. As the plastic material is compressed and transported along the barrel, it encounters resistance from the die at the end of the barrel. This resistance causes the pressure within the extruder to increase, which is necessary for forming the material into the desired shape.

Overall, the barrel is a critical component of the extrusion process, providing the necessary heat, pressure, and transport functions required to shape plastic materials into a wide range of products.

Extruder screw barrel for blowing film extruder machine