What are the different types of parallel twin screw barrel systems?


A parallel twin screw and barrel system is ideal for ma […]

A parallel twin screw and barrel system is ideal for manufacturing PVC profiles and pipes. This system is also great for extrusion foaming products. Its hardness ranges from 65-68 HRC and is made from EN41B steel. In addition, these barrels are available in bi-metal overlay and nitrided-core-treated versions.

Segment screw barrel
A segment screw barrel is a special type of parallel twin screw barrel. The segment screw barrel is available with nitrided, bimetallic, or carbide liners. There are various features of segment screw barrels, which make them suitable for various applications.

The segment screw barrel is used in a twin screw extruder. It is made of 41CrMo7 and 38CrMoAl steel. The barrel is subjected to gas nitriding to strengthen its tensile strength. However, this method can result in a lot of attrition.

The main difference between these two types of segment screw barrels lies in the material. The material is accelerated in high temperature and high pressure, producing a metallographic structure. The material is then cooled and is thus resistant to wear and tear. However, this material is not commonly produced in China.

Conical twin-screw extruder
The conical twin-screw extruder has a unique design, which makes it suitable for high-speed compounding. It is commonly used in the filling, blending, and reinforcement of reinforced plastics, carbon powder, and silane cross-linking materials. The parallel twin-screw extruder rotates in the same direction as the conical twin-screw extrusion barrel. Its two-step screw mechanism provides a high degree of process control. Moreover, the patented dual-screw design and optimized process parameters give it a distinct advantage over traditional extruders.

Compared to parallel twin-screw extruder, the conical twin-screw extruder can deliver much higher torque. This is due to the larger diameter of the screws at the feed end and smaller one at the die end. The conical twin-screw extrusion system is also more versatile because it allows users to customize the screw configuration according to the materials and processes.

A conical twin-screw extruder is equipped with a gearbox equipped with two large thrust self-aligning ball bearings. The gearbox is easy to maintain and has a large carrying capacity. A conical twin-screw exuder has two advantages compared to a parallel twin-screw extruder: it can produce polymers of different sizes and is capable of delivering a variety of applications.

Parallel twin-screw extruder
The parallel twin screw barrel extruder is a kind of twin screw extruder with twin screw and barrel. This kind of extruder uses EN41B steel as its main material and is able to achieve a hardness between 65 and 68 HRC. The barrels are manufactured by Shreeji Corporation and are equipped with nitrided-core treatment and bi-metal overlay. It is a good choice for extruding PVC profiles, pipes, and foaming products.

The parallel twin screw extruder's main limitation is the small distance between the two screws. The diameter of the thrust bearing is directly proportional to its capacity, so a larger diameter means a larger bearing capacity. This means that large-diameter anti-backup bearings are impractical, but small-diameter bearings can be connected in a series to withstand strong axial forces. Ideally, the load on the thrust bearing should be uniform.

The Parallel twin screw barrel extruder is designed to produce a high-quality finished product with a high output and profit. It features an advanced Mosaic Microprocessor Control System with an English-speaking 15-inch touch-screen to ensure ease of operation. Its compact design and low ingredient consumption make it a good choice for fume hood applications.