Twin Screw
Your Professional Twin Screw Manufacturer & Supplier
Founded in 2006, Zhejiang Zhongyang Screw Manufacturing Co., Ltd. has developed steadily over nearly two decades of continuous growth. The company now operates a 50,000㎡ production facility with more than 200 employees, and has become a recognized manufacturer in China's screw and barrel industry.
With strong engineering capability and mature production experience, Zhongyang focuses on the design, manufacturing, refurbishment, and supply of high-performance screws, barrels, and related components for plastic and rubber machinery.
Why Choose Us
Advanced Equipment
The company is equipped with over 200 CNC machining centers, PTA welding systems, nitriding workshops, and heat treatment facilities, ensuring stable processing quality and high precision production.
Custom Solutions
We provides flexible OEM and ODM services, supported by continuous engineering development to deliver customized screw and barrel solutions for different industrial applications.
Quality Control
A complete quality inspection system is in place, including material testing, dimensional measurement, hardness testing, and metallographic analysis, ensuring consistent product performance.
Global Service
Since 2008, we has been serving international markets, providing technical consultation, on-site inspection, measurement support, and one-stop procurement services for global customers.
Specification
|
Parameter |
Specification |
|
Screw Diameter |
Φ20 – Φ330 mm |
|
L/D Ratio |
16:1 – 35:1 |
|
Materials (Screw/Barrel Base) |
38CrMoAlA (SACM645) |
|
Materials (Alloy Sleeve/Liner) |
4Cr5MoSiV1 (SKD61, H13) |
|
Surface Roughness |
Ra 0.4 μm |
|
Linearity |
0.015 mm/m |
|
Nitrided Hardness |
HV 850 – 1000 |
|
Nitrided Depth |
0.5 – 0.8 mm |
|
Chrome Coating Thickness |
0.03 – 0.05 mm |
Features of Twin Screw
Win Screw Design: Twin screws have two screws, as opposed to a single screw extruder. This means higher production capacity and better mixing properties. With two screws rotating in the same direction with each other, the materials are better homogenised and a better melting is achieved.
High Throughput: Twin screws are capable of processing higher quantities of plastic material. The two screws working together allows the material to melt quickly and allows for higher production speeds.
Multipurpose Use: Twin screws are generally capable of processing a wide range of materials. They are suitable for processing polymer materials with different viscosity and properties. This provides flexibility in the production of various plastic products.
Better Mixing: The rotation of the two screws against each other allows for better mixing of materials. This helps to achieve a homogenous material distribution within the extruder system and products with better physical properties.
Better Control: Twin screws provide a better control during the process. The ability to independently adjust parameters such as rotational speed and temperature in the screws allows more precise control of the material processing process.
Longer Life: Twin screws are more durable than single screw extruders. The two screws distribute the shared load, resulting in less wear and a longer service life.
Co-Rotating
Co-rotating means that both screws rotate in the same direction, delivering outstanding dispersive and distributive mixing. This makes co-rotating extruders the preferred choice for demanding mixing and compounding applications such as polymer compounding, nanocomposites, pharmaceutical hot-melt extrusion, food texturization, and bio-based polymer processing.
Counter-Rotating
In counter-rotating twin screw extruders, the screws turn in opposite directions. This generates strong conveying forces while applying lower shear between the screw flights, making them especially well-suited for processing shear-sensitive materials. Counter-rotating designs are widely preferred for shaping operations, including PVC compounding, pipe and profile extrusion, cable coatings, and both rigid and flexible sheet production.
Parallel Screw
With parallel screw extruders, the screws maintain a constant diameter along their length, making them ideal for compounding, research, and high-throughput applications. In contrast, conical screw extruders feature screws that taper toward one end, providing enhanced feeding capability that is well-suited for high-viscosity or bulkier materials.
Applications of Twin Screw
Plastic Extrusion: Twin screws are widely used in the plastic extrusion process. In this process, plastic granules or powders are melted and passed through an extrusion mould and plastic products of the desired shape and size are obtained. They are used in the production of various plastic products such as pipe, profile, film, sheet, wire and cable coatings.
Tire and Rubber Products: Polymer materials such as LDPE, EVA, and POE play a critical role in the tire and rubber industry. These polymers are used to enhance the elasticity, durability, and processing characteristics of rubber products. Applications include: Tire Manufacturing, Seals and Gaskets, Automotive Components, Industrial Rubber Products.
Polymer Blends: Twin screws are used in the production of polymer blends. Twin screws are ideal when different polymer types or polymers and fillers need to be mixed. The rotation of the two screws against each other ensures better mixing of the materials and a homogenous mixture is obtained.
Resin Modification: Twin screws are used in resin modification processes. Additives, colourants, stabilisers or other chemical substances are added to polymer resins to change the properties of the polymer. Twin screws are ideal for homogeneous mixing and dispersion of materials.
Shaped Products: Polymers like LDPE, EVA, and POE are widely used in the production of shaped products that require complex geometries and precision molding. These materials offer excellent formability, impact resistance, and surface finish, making them suitable for: Automotive Components, Medical Devices, Consumer Electronics, Toys and Recreational Products, Industrial Applications.
Recycling: Twin screws are widely used in plastic recycling processes. Recyclable plastic materials are melted and shaped by twin-screw extruders and reusable plastic granules or products are obtained.
Food Processing: Twin screws are also used in the food processing industry. In particular, they are widely used in the production of starch-based products. Starch is mixed with water and other ingredients and fed into twin-screw extruders and starch-based products are produced through processes such as cooking, gelatinization, extrusion and drying.
Flat & Foam Products: Polymers such as LDPE, EVA, and POE are extensively used in the production of flat and foam products due to their lightweight, flexibility, and cushioning properties. These products are commonly used in, Packaging Materials, Construction, Automotive Industry, Sports and Leisure, Consumer Goods.
Customization Services
To meet the diverse processing requirements of different extrusion applications, we provide customized twin screw solutions designed for efficient mixing, compounding, and material processing. We can adjust screw configuration, element combination, L/D ratio, rotation direction, material selection, surface treatment, and dimensional specifications according to your production needs. Please contact us for further information or technical support.
Packaging and Shipping
|
Packaging |
Wooden case, plywood case, or customized export packaging |
|
Transportation methods |
Sea freight, air freight, railway, or express delivery |
Our Certificate
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