What are the characteristics of parallel twin screw barrel

A Parallel twin screw barrel has an important role in the production of extruded products, including profiles and PVC pipes. Its hardness ranges from 65 to 68 HRC, making it an excellent choice for many applications. The barrels of parallel twin screws are made from EN41B steel and have a bi-metal overlay.There are two main types of twin-screw extruders: conical and parallel. They differ in the length of their barrels, and the diameter of the heads varies accordingly. A conical twin-screw extruder is usually longer than a parallel twin-screw one.A conical twin-screw extruder has a larger inlet diameter and a larger outlet diameter. It is generally used for extruding polymers that are highly reactive. Other types of twin-screw extruders include those that are suited for processing PVC.An advantage of a twin-screw extruder is the narrow residence time distribution.

Parallel twin screw barrel for plastic extruder machine


This property allows it to remove heat, devolatilize unwanted byproducts, and pump highly viscous materials. This extruder design can be used for a variety of applications, including polymer compounding and blending. It also allows the operator to adjust the screw setup to optimize the extrusion process.The screw clearance relates directly to the quality of the end product. If the screw clearance is too large, the shear rate will be low, and the plasticizing effect will be poor. It will also increase the time the material spends in the barrel, making it easy to burn. Alternatively, if the screw clearance is too small, the material will burn and may not have the desired shear rate.A segment screw barrel is a special type of parallel twin screw barrel. This type was first introduced many years ago by the EJS factory. It is typically bimetallic, but can also be nitrided and feature a carbide lining. It is used in extrusion and pelletization processes.

The process of reconstructing a segment barrel includes three steps. The first step involves purchasing a matched segment Oval Liner. The second step involves enlarging the original bore, and the third step consists of putting in the liner and fixing it. If necessary, a feeding hole is made as well.The resulting product consists of a cylindrical insert seated in the insert receiving opening. The insert has two circular bores in communication along a common chord. The bores are lined with a wear resistant layer, which is preferably applied by hot isotactic pressing. The outer surface of the insert is covered with a thin layer of a heat conductive malleable material.A parallel twin screw barrel is used to produce products by combining two cylindrical screws that rotate in opposite directions. This type of screw is widely used for various applications.

Its main advantages include low rotational speed, uniform shear stability, high conveying capacity, good exhaust effect, and stability of product quality.In addition to having the same outer diameter, a parallel twin screw also has the advantage of being able to increase the aspect ratio, or the ratio of the screw's effective part length to its outer diameter. A conical twin screw, on the other hand, has two axes inserted at an angle, and the center distance between these two axes gradually increases from the small end to the large end.Another major advantage of a parallel twin screw barrel is its plasticizing effect. This property allows it to achieve high output and stable extrusion. Furthermore, it has a high load-bearing torque. In addition, its plasticity increases its service life.