Twin Screw Barrel Elements Overview
Twin screw extruder segment screw barrel is a key component of the modern extrusion process. It plays a crucial role in controlling the output and quality of the final product. The segment screw barrel is an innovation in twin screw extrusion technology that has revolutionized the industry. The segment screw barrel is designed to enhance mixing, dispersion, and melting of polymers. The design comprises of multiple segments with varying lengths, each with a specific pitch and diameter. The unique geometry of each segment enables different mixing and conveying functions, resulting in high-quality end products.
Twin screw extruder segment screw barrel offers various benefits that make it an ideal choice for the modern-generation extruder. One of the main advantages is its ability to utilize a wide range of polymers. It has a broad operational window that enables it to handle various materials with different viscosities and melt flows. In addition, the segment screw barrel is easy to maintain and replace. The modular design allows for individual segments to be replaced when damaged, reducing downtime and maintenance costs. This makes it a cost-effective option for manufacturers and processors.
The design also provides excellent heat transfer and optimal processing conditions, leading to consistent output quality. It also enables an increase in output rates, resulting in lower production costs and improved productivity.
Overall, twin screw extruder segment screw barrel is a game-changer in the modern extrusion process. Its flexible, modular design, and ability to produce high-quality end products, make it a popular choice among manufacturers and processors. As the technology advances, we are likely to see more improvements in the design of the segment screw barrel, leading to further benefits.
Application of Segmental Twin Screw Barrel
In the plastics extrusion industry, segmental twin screw barrel is commonly used in the production of PVC pipes, profiles, film, and sheet. It provides excellent mixing and dispersion capabilities, ensuring the quality and consistency of the final product. For the rubber processing industry, segmental twin screw barrel can produce high-quality rubber compounds with good homogeneity and dispersion of fillers and additives. Moreover, segmental twin screw barrel is also widely used in the food and pharmaceutical industry for processing ingredients and final products. The precisely controlled mixing and kneading process ensures the quality and consistency of the products, making it a reliable tool that meets the industry's stringent hygiene and safety standards.
Co-rotating screw segments for below machines
Kobe
JSW
KraussMaffei
Theysohn
Toshiba
Useon
Coperion
Buss
More...
Screw Segments Configuration
Segmental Screw Barrel Structure and Different Sections
Intake Zone | Material feeding area |
|---|---|
| Conveying Zone | Pre-conveying material into the extruder |
Melting Zone | Heating and melting material |
| Natural Venting Zone | Remove volatile and moisture |
Mixing Zone | Homogenize material and mix material evenly |
Vacuum Venting Zone | Thoroughly eliminate volatile substances and moisture to achieve the desired state |
Metering Zone | Continuously and quantitatively output raw materials to the mold area |
Common Use Screw Elements Type
How to maximize production capacity?
- The screw combination from the main feeding area to the kneading section must use a conveying block with the maximum lead
- For raw materials with a particularly low stacking density in the formula, such as silicone powder, a special design of feeding thread blocks can further increase the feeding amount
- The thermo-plastic is subjected to intense shearing. This work is done by Kneading Blocks
- Mixing is an essential function in an extruder. The goal of the mixing process in an extruder is to increase the uniformity of the composition
- Kneading blocks and some special tooth elements with multilobe geometry eliminate meta-radial shear and achieve efficient distributive mixing
- Vents are required to continuously remove air and moisture during or after the melting stage at atmospheric pressure
- Highest screw pitch provides lowest degree-of-fill and optimum venting of air through screw
- The purpose of the melting zone is to build the required amount of pressure to achieve continuous streamlined output. This zone is also known as the pumping zone.
Screw Segment Material Selection
The choice of material is a crucial factor that determines the overall quality and longevity of the product. The materials used for twin screw elements should possess specific attributes such as high strength, durability, wear resistance, and corrosion resistance.
- Imported HIP material, high corrosion resistance and wear resistance powder alloy, such as WR5 and WR13
- High-speed tool steel material, W6Mo5Cr4V2, SKD11 vacuum quenching, overall hardening, used for processing fiberglass engineering plastics below 30%, high filling engineering plastics processing, etc
- Nitrided steel, 38CrMoAla gas nitriding, high hardness, corrosion resistance, super toughness, anti-rupture, used in the production of ordinary threaded components and reciprocating threaded components, characterized by external hardness and internal softness, wear resistance, and corrosion resistance
- Hastelloy material, C276, ultra-strong corrosion-resistant nickel-based alloy, screw production using fluoroplastics (F46) and other extruders
Twin Screw Shaft
Shaft Type
- Single Keyway Shaft
- Square Keyslot
- Dual Keyslot
- Involute Inner Spline
- Round Keyslot
- Retackle Spline
Twin screw shaft size range available from 12mm to 100mm, length from 500mm to 8000mm, with certain requirements, can add a cooling system inside, material selection mainly uses 40CrNiMoA, and connection type by involute spline mostly. With high torque and high load application, can also select material like SKD61, WR15 with quenched and nitrided treatment to get better toughness and durability
Twin Extruder Barrel Segment Types
- Closed Barrel
- Feeding Barrel
- ATM Barrel
- Vacuum Barrel
Twin Extruder Barrel Inliner Type & Material
- One-piece barrel without inliner
- Overall type inliner
- C type inliner
Inliner material Selection
- W6Mo5Cr4V2
- Ni60
- WR5
- WR13