Mobile/WhatsApp: 0086-13818551740
Counter-rotating twin screw barrels can be categorized into conical-twin screw barrel and parallel-twin screw barrel.
Counter-Rotating Extruder Twin Screw Barrel
About Counter-Rotating Extruder Twin Screw Barrel
A counter-rotating twin screw barrel is a key component in an extruder system, particularly used in the production of plastic products like pipes, profiles, and sheets. In a counter-rotating twin screw extruder, the two screws rotate in opposite directions. This counter-rotation creates a squeezing action between the screws, which is especially effective for processing materials with high viscosity or those that require gentle mixing.
The design of the counter-rotating screws are commonly used in the production of heat-sensitive materials and offers advantages in terms of output stability, better melt quality, and low energy consumption.
Counter-rotating twin screw barrels can be categorized into conical-twin screw barrel and parallel-twin screw barrel.
Conical-Twin Screw Barrel
More than 25 years experience ensure the product quality
Parallel-Twin Screw Barrel
Qualified and experienced sales and engineering team
Conical-Twin Screw Barrel
A Conical-Twin Screw Barrel is mainly used for processing PVC products, such as PVC pipes, profiles, sheets, pellets and films. The unique and specific conical-twin screw geometry designs are offered to process PVC WPC SPC and foaming ingredients.
Applications of Conical-twin screw barrel
PVC Pipe and Profile
Both applications benefit from the conical-twin screw’s ability to handle high-output production, offering superior wear resistance and long service life, especially when processing high-fill PVC formulations or recycled materials.
PVC WPC and SPC
Conical-twin screw barrel are favored for their durability, anti-wear, and anti-corrosion features, making them ideal for processing materials with fillers like wood fibers and stone powder that can wear down traditional machinery.
PVC Foam Sheet and Board
Conical-twin screw barrels are widely used in the production of PVC foam boards. Their design ensures uniform plasticization and stable material flow, which is crucial for achieving consistent foam density and surface smoothness.
How to choose geometry design of conical-twin screw barrel
Conical-twin Screw geometry design is the most crucial point in PVC extruder processing. This is also our most significant technical “know how” during more than 25 years operational experience. As shown in the picture below, there’s feeding zone, barrier zone, plasticizing zone, venting and extruding zone of each conical-twin screw. The lead pitch and length of each zone are all determine the extrusion performance and PVC product quality.
Models and Output Capacity of Conical-Twin Screw Barrel
Parallel-Twin Screw Barrel
The screws in a counter-rotating parallel-twin screw barrel have a consistent diameter throughout their length. This design is beneficial for processes that require consistent shear and mixing over the length of the barrel. They are generally more robust and stable and can handle higher throughput rates compared to conical twins.
Steel Material
High-quality materials like 38CrMoAlA or bimetallic alloys are used parallel twin screw barrel
Standard Specification
Length-to-diameter (L/D) ratios typically range from 20:1 to 34:1, with screw diameters from 45mm to 160mm. Customizable dimensions are available depending on your machine and material requirements.
Parallel Twin Screw Geometry
The screw geometry depends on the material and application. Consulting with an experienced manufacturer ensures the best screw design for your process.
Wear-resistant Treatments
Nitriding, bimetallic coating, or hard surfacing (HVOF or PTA processes). These treatments extend the screw barrel's service life, especially for processing abrasive fillers or additives like glass fiber or CaCO₃.
Conical-twin screw barrel VS Parallel- twin screw barrel
Both conical-twin screw barrels and parallel twin screw barrels are designed for use in twin screw extruders, but they differ in structure, application, and advantages. Each type of screw barrel has its unique strengths depending on the production requirements and material characteristics. Here’s a breakdown to compare them:
Screw Design
Conical: The screws with a larger diameter at the feed end and a smaller diameter at the discharge end. Parallel: The screws are cylindrical and run parallel to each other, with a uniform diameter from feed to discharge.
Material Flow
The conical shape provides higher compression, making it suitable for processing materials that require more intensive mixing and kneading. Offers consistent compression and uniform mixing, making it ideal for continuous processes.
Application
Conical: PVC processing Extruding profiles and pipes, especially applications requiring high-pressure extrusion. Parallel: Higher-output applications requiring uniform processing
Advantages of Conical
High Pressure & Compression; Good Feeding Performance; Compact design and less space required; Low screw speed provides better melting and mixing, minimizing shear stress on the material.
Advantages of Parallel
Can be used in a wide range of applications, including thermoplastics; High output and better heat transfer; Can be used in a wide range of applications, including thermoplastics.
Selection Consideration
Conical-Twin Screw Barrels are better for processing PVC in high-pressure applications or when space is a constraint; Parallel Twin Screw Barrels are ideal for large-scale production and when consistent, uniform material processing is required.
Bimetallic Solutions of Twin Screw Barrel
Nitride Screw Barrel
Mostly of JINZE screw barrel undergo a nitriding process to enhance its durability and performance. Nitriding is a basic heat treatment process in which nitrogen is diffused into the surface of the screw barrel to form hard nitrided layers. The hardness after nitride should be larger than HV900 and nitride depth should be 0.5mm-0.8mm
Bimetallic Screw Barrel
A bimetallic screw barrel is a type of extruder screw barrel that is welding coated by Nickel-based alloy mixed with a certain proportion of tungsten carbide. The primary purpose of this bimetallic structure is to enhance the performance and durability of the screw barrel, particularly in high-stress applications such as plastic extrusion.
Barrel with SKD steel sleeves
A barrel with SKD steel sleeves is a highly durable extruder barrel designed to offer exceptional wear resistance, heat resistance, and strength. By using SKD steel, which is a high-quality tool steel, the sleeve provides a protective layer that significantly extends the service life of the barrel, especially in high-performance and high-throughput applications
25-Years Experience in Making Screw Barrel for Various Brands of Extruders
It IS easy to start with us
How To Work With Us
Reach out us via email , our website, or through social media channels. You can also visit our factory or attend trade shows where we exhibit.
Share the specifics of your requirements, such as the type of extruder screw barrel you need (e.g., conical-twin, parallel twin, single screw), material requirements, customization needs, and any specific performance targets (e.g., wear resistance, corrosion resistance).
Our team will guide you through product options, recommend the best solution for your application, and answer any technical questions you may have. We are also available to discuss your production capacities, delivery deadlines, and any particular challenges you face in the procurement process..
- Customized Quotation: Based on your specific requirements, we will provide a detailed quotation. This includes product pricing, lead time, customization costs (if applicable), payment terms, and shipping details.
- Clarification: We can discuss any concerns regarding the quotation. If you need any adjustments in the design or specifications, we will modify the offer accordingly.
- Technical Consultation: If your order requires a customized extruder screw barrel or bimetallic solutions, we work closely with you to define the exact design and performance requirements. This includes screw geometry, steel materials, and coatings.
- Design Approval: Once our engineers have prepared a design or modification plan, we will send you CAD drawings and technical details for approval before moving forward. We will ensure that the designs meet your performance and manufacturing standards.
Production Begins: Upon order confirmation, our production team starts the manufacturing process.
Quality Control: Each part undergoes strict quality control tests, including dimensional checks, material testing, hardness testing, and performance simulations. We ensure that each part meets the required specifications before moving forward.
Regular Updates: We provide regular updates on the production status, including photographs or videos of the work in progress and any pre-shipment inspections.
Packaging & Shipment: All products are carefully packaged to prevent damage during transport. We will arrange for the most efficient shipping method according to your needs.
Trusted Clients
0
K+
Frequently Asked Technical Questions
The steel material used for our extruder screw barrels is carefully selected to meet the specific requirements of your extrusion process, ensuring durability, performance, and resistance to wear. We offer several steel options based on the application and performance needs.
The most common steel we use for extruder screw barrel is 38CrMoAlA which the hardness after nitride is > HV900.
There are tutorial video of how to install twin screw barrel in our Youtube channel.
Yes, in addition to our high-quality screw barrels, JINZE SCREW also supplies a wide range of spare parts for plastic extruders to ensure the smooth and efficient operation of your extrusion systems.
We offer various components that complement our screw barrels, including: Heaters and cooling fans; Gearboxes; barrel adapters;
The lead time for a replacement screw barrel depends on several factors, including the complexity of the design, the material specifications, and the surface treatments required. Generally, our typical lead time for a replacement screw barrel is:
- Standard Screw Barrels: 4-6 weeks from order confirmation to shipment.
- Customized Screw Barrels: 4-8 weeks, depending on the complexity of the custom design and any additional surface treatments or coatings.
For urgent requests, we do offer expedited manufacturing options, but this may be subject to availability and additional fees. We highly recommend discussing your timeline with us in advance so we can accommodate your schedule and ensure timely delivery.
Yes, our screw barrels are fully customizable and designed to be compatible with a wide range of extruder brands.
If you have a specific brand or model in mind, feel free to share the details, and we’ll provide expert guidance on how we can meet your needs.
The surface treatment of an extruder screw barrel is crucial for enhancing its performance, durability, and resistance to wear, corrosion, and high temperatures. At JINZE SCREW, we offer a variety of advanced surface treatments to ensure the longevity and efficiency of our screw barrels in demanding industrial environments.
The main surface treatments we provide include: Bimetallic Coating； Nitriding；Chromium Plating (Hard Chrome Plating)；Tungsten Carbide Coating
L/D ratio refers to the length-to-diameter ratio, which is the ratio of the screw's length (L) to its diameter (D). In an extruder, the L/D ratio is an important parameter as it affects the mixing, heating, and conveying of materials within the screw.
Yes, absolutely! At JINZE SCREW, we specialize in providing customized screw barrels to meet the unique processing requirements of our clients. We understand that different applications—whether it’s for specific materials, product types, or production conditions—demand precise customization.
Our engineering team works closely with you to design and manufacture screw barrels tailored to your exact needs. . We consider factors such as:Material Compatibility；Screw Geometry；Coatings & Surface Treatments；Specific Performance Requirements
We offer remote technical support to assist with installation, troubleshooting, and any operational issues you may encounter. Our experienced engineers are available to guide you through the process, provide setup advice, and answer any technical questions you may have to ensure a seamless installation.
On-Site Services:
In certain cases, we can arrange for on-site installation or troubleshooting services at an additional cost. This service is typically available for clients in strategic regions or when large-scale installations are involved. Please contact us directly to discuss your specific needs, and we can provide a tailored solution based on your location and project requirements.
At JINZE SCREW, we take pride in the quality and durability of our screw barrels. To ensure your investment is protected, we offer a comprehensive warranty on all of our products. Our standard warranty includes: Material and Manufacturing Defects;Performance Guarantee;Custom Solutions Support
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.