Parallel Twin Screw Barrel
Parallel Twin Screw Barrel Description
Parallel twin screw barrels house two parallel screws that rotate in the same direction (co-rotating) or in opposite directions (counter-rotating).
1. Barrel Construction:
– Material: Parallel twin screw barrels are typically made of high-quality steel alloys, such as nitrided or bimetallic steels, which offer excellent wear and corrosion resistance.
– Barrel Segments: The barrel is usually composed of several modular segments that are bolted or clamped together, allowing for easy configuration changes and maintenance.
2. Screw Channels:
– The barrel features two parallel bores or channels that accommodate the twin screws.
– The channels are precisely machined to ensure a close fit with the screw flights, minimizing leakage and ensuring efficient material transport and mixing.
3. Heating and Cooling:
– Heating Zones: The barrel is divided into multiple heating zones, each equipped with heating elements (e.g., electric heater bands or fluid-circulating jackets) to maintain the desired temperature profile along the barrel length.
– Cooling Zones: Cooling systems, such as water or oil circulation channels, are incorporated into the barrel to prevent overheating and control the melt temperature in specific zones.
Parallel Twin Screw Barrel Description
Parallel twin screw barrels, in combination with the twin screws, offer several advantages over single screw extruders, such as improved mixing, shorter residence times, and better control over the processing conditions. The barrel design and configuration play a crucial role in determining the performance and efficiency of the twin screw extrusion process, influencing factors such as throughput, product quality, and energy consumption.
The parallel twin screw extruder can process PVC pipes: used in pipelines, urban water supply and drainage pipeline systems; special-shaped materials, plates (sheets), plastic steel doors and windows, wood plastics, floors, stair handrails, etc.
Parallel Twin Screw Barrel Application Industry
PVC are widely used for water distribution lines, especially in smaller diameters, due to their ease of installation and good hydraulic properties.
Plastic Door
PVC (polyvinyl chloride) plastic doors are a popular type of plastic door that are widely used in residential, commercial, and industrial settings
Plastic Plate
Plastic plates have a wide range of applications across various industries and sectors due to their versatility, durability, and cost-effectiveness.
Deermachine Parallel Twin Screw Barrel Advantages
High Production Efficiency
High-quality Screw Barrel can effectively improve efficiency, extend service life, and increase continuous working time of injection molding machines.
Consistency and Precision
Injection molding screw and barrel systems can produce parts with tight tolerances and high dimensional accuracy, ensuring consistency across multiple production runs.
Cost-Effectiveness
The screw and barrel system minimizes material waste by efficiently melting and mixing the plastic, reducing scrap and increasing material utilization.
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Our Equipment Brands
| Diameter range | Φ65～180 |
| Aspect ratio | L/D=18～25 |
| Material | 38CrMoALA |
| Surface hardness | HV:≥290 |
| Nitriding hardness | HV950～1000 |
| Nitriding depth | 0.45～0.7mm |
| Nitriding brittleness | ≤first level |
| Surface roughness | Ra0.4 |
| Screw straightness | 0.015mm |
| Surface chrome plating hardness after nitriding | ≥900HV |
| Chrome plating thickness | 0.05～0.10mm |
| Dual alloy hardness | 60-70 HRC |
1.CNC Processing Workshop
CNC (Computer Numerical Control) processing workshops play a crucial role in the manufacturing and maintenance of injection molding screws and barrels. These workshops are equipped with advanced CNC machines and skilled technicians to perform precise machining, grinding, and finishing operations on screws and barrels.
2.High temperature alloy casting furnace
Dual alloy processing is a specialized technique used in the manufacturing of injection molding screws and barrels to enhance their performance, durability, and resistance to wear and corrosion. This process involves the use of two different alloys or materials strategically combined to create a composite structure with superior properties.
3.Heat treatment workshop
Thermal processing plays a vital role in the manufacturing and maintenance of injection molding screws and barrels. The application of heat treatment and thermal processing techniques helps to improve the mechanical properties, wear resistance, and longevity of these critical components.
4.CNC vertical grinding machine
The use of CNC vertical grinding machines in screw barrel processing offers several advantages, including:
– High precision and repeatability in the grinding process
– Automated and efficient operation, reducing manual labor and increasing productivity
– Ability to handle screw barrels of various sizes and materials
– Reduced lead times and improved quality control
– Extended screw barrel lifespan and reduced maintenance costs
5.Our Stock and Packaging
Haitian, MA 1st, 2nd and 3rd generations are all in stock.
Parallel Twin Screw Barrel FAQ Guide: Everything You Need to Know
The parallel-twin screw barrel is an essential part of any extrusion system that greatly affects the system’s accuracy, efficiency, and repeatability. They are widely used for processing polymers and other materials. Their unique design and functionality make them indispensable in plasticizing, compounding, and extrusion applications.
This extensive FAQ guide is going to help you learn about parallel twin screw barrels and their applications.
What is a Parallel Twin Screw Barrel?
A parallel twin-screw barrel is a type of barrel that is used in twin-screw extruders, which are popular in plastics, food, and other industries. Two screws on the barrel are positioned parallel to one another and are compelled to rotate either counter-rotating or co-rotating.
The screws function jointly to transport, mix, melt, and homogenize materials as they move through the barrel. Parallel twin screw barrels are most famous for their flexibility, enabling the manufacturer to work with a number of materials, including polymers, composites, food products, and chemicals.
How Does a Parallel Twin Screw Barrel Work?
The operation principle of a parallel twin screw barrel is based on the principles of screw contact with the barrel. Here’s a step-by-step breakdown of the process:
Feeding: The raw materials are placed into the barrel through a hopper.
Conveying: The screws, which are rotated, drag the material along the barrel.
Melting: As the material is pushed forward, it is heated and sheared, which causes it to change its state from solid to liquid.
Mixing: The intermeshing screws ensure that the material is well blended and mixed thoroughly.
Discharge: The material is extruded through a die at the end of the barrel.
Parallel twin screw extruders are incredibly versatile because the screws and barrel can be made to fit specific materials and processing requirements.
What Are the Advantages of Parallel Twin Screw Barrels?
The following are some of the advantages of parallel twin screw barrels:
High Efficiency: The intermeshing screws are very efficient in mixing and conveying, hence producing a uniformly distributed product.
Versatility: It is possible to extrude a large number of materials in their formulation, including hot and sticky substances.
Precision Control: It is achievable to set different parameters such as temperature, screw speed, and pressure to desired levels.
Self-Cleaning: The co-rotating design avoids material retention, which can lead to contamination.
Durability: High-quality barrels, like those from Deer Machine, are constructed from long-lasting materials that can be used for a long time.
What Materials Are Used to Manufacture Parallel Twin Screw Barrels?
The selection of the materials for parallel twin screw barrels is determined by the load, the type of material that is going to be processed, and the specific application. Common materials include:
- Nitrided Steel: It has good wear resistance and can be used for most laboratory and production applications.
- Bimetallic Alloys: It has a hard surface layer on top of a tough core, which makes it very strong when dealing with severe wear conditions.
- Stainless Steel: This is recommended for the food and pharmaceutical industries because it is easy to clean and resistant to corrosion.
- Tool Steel: For high temperature and high pressure operations.
Deer Machine offers the production of barrels from high-quality materials and advanced heat treatment methods for enhanced durability.
Applications of Parallel Twin Screw Barrels
These barrels are employed in the plastic, rubber, food, and pharmaceutical industries owing to their effectiveness in mixing, melting, and compounding. This makes them indispensable in many manufacturing processes due to their capability of processing different materials with ease.
The most typical use is in plastic extrusion, where these barrels are employed in the production of PVC pipes, profiles, sheets, and boards. They ensure that the product quality is uniform and therefore suitable for the manufacture of rigid and flexible plastic products.
Besides plastics, these barrels are used in the controlled ingredient processing in the food and pharmaceutical industries. In food production, they are employed for extruding snacks, and pet food. In the pharmaceutical sector, they help in the production of medical-grade plastics for syringes, vials, and other packaging.
Another important application is in the wire and cable manufacturing, where these barrels help in the insulation coating of electrical wires and cables. This process increases the longevity and the safety of the wiring systems that are used in construction and electronics.
Last, the adhesive and sealant industry relies on these barrels for manufacturing hot melt adhesives and high viscosity sealants. Their mixing function is critical in the preparation of materials used in the construction, automotive, and packaging industries.
What is the difference between co-rotating and counter-rotating twin screws?
Co-rotating and counter-rotating twin screw extruders are widely used in polymer processing; however, the differing principles of operation greatly affect the efficiency and suitability for particular usage. Here’s a detailed comparison:
1. Screw Rotation Direction
Co-rotating extruders:
Both screws rotate in the same direction (in either the clockwise or counterclockwise direction), which leads to the synchronization of the material flow and reduced screw friction. This design is less likely to cause problems and is better for use in applications that require good mixing.
Counter-rotating extruders:
The screws rotate in the opposite direction and produce cellular material flows that increase the shear rate. This formulation is more effective for material that needs intense plasticization or for improved conveyance.
2. Applications
Co-rotating extruders:
Suitable for:
Combination of polymers with fillers, including glass fibers or pigments, etc.
Extrusion of thermally sensitive materials such as engineering plastics.
High-volume production of master batches.
Counter-rotating extruders:
Ideal for:
PVC extrusion, especially for pipes and window profiles, because of gentle melting.
Extrusion of highly viscous or abrasive materials (such as rubber, wood, and plastic composite).
Positive displacement (food and pharmaceuticals) applications.
When to Choose Each Type
Co-rotating: Select tasks that demand for homogeneous mixing or the processing of heat-sensitive polymers.
Counter-rotating: Choose for accurate extrusion of rigid materials or processes that require a specific level of shear (for example, foams, medical grade polymers).
What type of Materials are used for Parallel Twin Screw Barrels?
The selection of the materials for construction of parallel twin screw barrels is very important for the durability and the performance. The common materials used include:
38CrMoAlA (DIN1.8509): It is a high tensile strength and wear resistant material, which is suitable for high pressure applications.
34CrAlNi7 (DIN1.8550): It exhibits good toughness and resistance to fatigue, suitable for severe service conditions.
31CrMoV9 (DIN1.8519): It has good hardness and wear resistance for general purpose use.
42CrMo (AISI4140): A very popular alloy steel renowned for its tensile strength and impact strength.
Surface treatments including nitriding, bimetallic carbide lining, and chrome plating, are used to improve the wear resistance and the service life of the screw barrels.
Whether you are a professional or a newcomer in the extrusion technology, this guide will provide useful information that will help you make the right decision when it comes to parallel twin screw barrels. Buy the right equipment, follow the rules, and work with professional manufacturers to get the best from your production processes.
Conclusion
In extrusion processes, parallel twin screw barrels are necessary components that cannot be replaced. As you know their functionality, applications, and required maintenance, you can get the best out of them. For top-quality barrels and expert support, come to Deer Machine for solutions that are tailored to your needs.
Why Choose Deer Machine for Parallel Twin Screw Barrels?
Deer Machine is a leading provider of high-quality parallel twin screw barrels that are reliable and efficient. As a leading manufacturer of parallel twin screw barrels, it focuses on quality and customer-specific solutions.
With the company’s experience in design and tooling, Deer Machine offers innovative solutions that meet customer’s needs. Their products are known for their long lasting durability, a very smooth surface, and cost effectiveness.