Screw and Cylinder
Your Professional Screw and Cylinder 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
|
Item |
Specification |
|
Screw Diameter Range |
110 – 130 mm |
|
Cylinder (Barrel) Inlet Diameter |
110 – 130 mm (matched to screw size) |
|
Cylinder Outlet Diameter |
75 – 95 mm |
|
Length-to-Diameter Ratio (L/D) |
24 – 28 |
|
Processing Type |
High-output extrusion system |
|
Material Structure |
Alloy steel / bimetallic lined barrel |
|
Wear Protection |
Nitrided or tungsten carbide coated optional |
|
Heating Zones |
6 – 8 independent temperature zones |
|
Drive Power Requirement |
160 – 315 kW (depending on application) |
|
Application Range |
PVC pipes, profiles, WPC, heavy-duty extrusion |
|
Cooling System |
Air/water cooling integrated barrel design |
|
Design Feature |
High torque, high pressure, large throughput capacity |
Importance of Screw and Cylinder
Efficiency
Properly designed screw and cylinders enhance productivity by optimizing material flow and reducing energy consumption.
Product Quality
They ensure uniform melting and mixing, reducing defects in the final product.
Durability
High-quality components minimize wear and maintenance, extending the lifespan of the extrusion machine.
As the screw rotates inside the barrel, it pushes the raw plastic material forward.
The friction between the screw, barrel, and material generates heat, melting the plastic.
The combination of screw design and barrel temperature control ensures uniform melting and mixing, leading to consistent product quality.
Key Design Parameters of Screw and Cylinder
|
Parameter |
Description |
Typical Range/Values |
|
Screw Diameter (D) |
Diameter of the screw affecting material throughput and pressure generation |
20 mm – 120 mm |
|
L/D Ratio |
Screw length to diameter ratio influencing melt homogeneity |
15:1 – 30:1 |
|
Flight Depth |
Distance between screw flights impacting melt pressure |
2 – 6 mm |
|
Compression Ratio |
Ratio of channel depth at feed to metering zone for effective melting |
1.5 – 3.0 |
|
Barrel Material |
High-strength alloy for wear resistance and heat conduction |
Alloy Steel, Bimetallic lining |
|
Surface Coating |
Enhances abrasion and corrosion resistance |
Nickel plating, Chromium plating |
|
Mixing Section |
Optional element for compounding or color mixing |
Barrier screw, Maddock section |
|
Maximum Operating Temperature |
Ensures polymer melts without degradation |
250°C – 350°C |
|
Maximum Back Pressure |
Determines injection pressure and material homogeneity |
50 – 150 MPa |
Applications of Screw and Cylinder
Extrusion
In extrusion processes, screws and cylinders are used to push materials, such as plastic pellets or rubber compounds, through a heated barrel. The material is melted and then forced through a die to create continuous shapes, such as pipes, tubing, or sheets.
Injection Molding
Screws and cylinders play a crucial role in injection molding machines. They are responsible for melting the raw material (usually plastic pellets) and injecting it into a mold cavity under high pressure. The screw's rotation and movement forward and backward control the flow and pressure of the molten material.
Compounding
In compounding processes, screws and cylinders are used to mix and blend various materials together. This can include additives, fillers, and pigments with a base material to create custom polymer compounds with specific properties.
Extrusion Blow Molding
In blow molding processes, screws and cylinders help melt and shape the plastic material into a hollow form, which is then blown into a mold cavity to create products like bottles, containers, and automotive components.
Customization Services
To meet the diverse production requirements of different industries, we provide tailored screw and cylinder solutions for various applications and materials. We can adjust screw geometry, cylinder structure, material grades, surface treatment, and dimensional specifications based on your processing needs. For further information or technical support, please feel free to contact us.
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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