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Parallel Twin Screw Barrel

Jinxing Screw: Your Professional Parallel Twin Screw Barrel Manufacturer!

 

Established in 1989, Zhejiang Jinxing Screw Manufacturing Co., Ltd. is a leading professional screw manufacturer located on Zhoushan Jintang Island. We offer fast and reliable global distribution with customized services following client requirements. We have cooperated with multinational corporations, such as MAPLAN, APPL, WAPO, and SAMSUM.

 

Strong Production Ability
Our company, with 220 employees and a 25 million USD investment, has secured 107 acres for a modern factory complex, including a 2,276.39 square meter electroplating workshop.

 

Advanced Equipment
Our company uses advanced machinery like the Austrian CNC PICK UP 500 for precision machining, an automatic nitriding system for product hardness, and an American plasma screw overlay machine with an automatic grinder for quality and durability.

 

High Quality
Our products feature advanced materials, including high-grade steel, which extends their wear life and ensures stable operation. Each barrel is rigorously tested to exceed industry standards. This commitment to quality guarantees the superior performance and durability of our products.

 

Rich Experience
We have over 30 years experience in manufacturing and designing feed screws and barrels for injection, extrusion, and blow molding applications.

What is Parallel Twin Screw Barrel

 

The parallel twin screw barrel is developed on the basis of the single-screw extruder. Due to its good feeding performance, mixing and plasticizing performance, exhaust performance, extrusion stability, etc., it has been widely used in extruded products. Forming processing.

Features of Parallel Twin Screw Barrel
 

 

Enhanced Mixing and Dispersion
Parallel twin screw barrels excel at achieving efficient and thorough mixing of additives, colorants, and fillers with the base polymer. The intensive kneading and shearing action between the two screws create multiple interfaces, leading to enhanced dispersion of additives throughout the melt. This level of mixing ensures uniform distribution of additives, resulting in consistent product properties and improved material performance.

 

Wide Range of Applications
Due to their versatility, parallel twin screw barrels can handle various polymers, including polyethylene, polypropylene, PVC, and engineering plastics. Their ability to process a wide range of materials makes them suitable for diverse applications, from producing simple profiles and pipes to complex multi-layer structures.

 

Controlled Residence Time
Parallel twin screw barrels offer excellent control over residence time, the duration the polymer spends in the barrel during processing. Controlling residence time is vital when handling temperature-sensitive materials, preventing thermal degradation and ensuring consistent melt quality.

 

Efficient Heat Transfer
The parallel arrangement of the screws in twin screw barrels allows for efficient heat transfer along the extrusion process. This ensures consistent and uniform heating of the polymer, reducing the risk of hotspots and ensuring a homogeneous melt.

 

Reduced Material Degradation
With reduced shear rates on the polymer, parallel twin screw barrels minimize material degradation during extrusion. This feature is particularly beneficial for processing shear-sensitive materials, such as certain engineering plastics, ensuring the preservation of their molecular integrity and properties.

 

High Throughput Rates
Parallel twin screw barrels enable higher throughput rates compared to single screw extruders. The two screws working in tandem increase the material handling capacity, allowing manufacturers to achieve higher production volumes and meet growing demands.

 

Reliable Feeding and Conveying
The self-wiping effect of parallel twin screw barrels ensures efficient feeding and conveying of the material through the extruder. This design minimizes material stagnation and eliminates dead zones, leading to consistent extrusion and improved overall process reliability.

 

Process Stability and Control
Parallel twin screw barrels offer better process stability and control due to their ability to precisely manage temperature and material mixing. This enhances overall product quality and reduces the occurrence of defects or inconsistencies in the extruded output.

 

Reduced Scrap and Waste
With improved process control and consistent product quality, parallel twin screw barrels help minimize scrap and waste production. Manufacturers can achieve higher yield rates and reduce material wastage, contributing to cost savings and sustainability.

 

Better Foaming and Reinforcement
For applications requiring foaming or reinforcement, parallel twin screw barrels can be equipped with special mixing elements to facilitate the incorporation of blowing agents or fibers, ensuring uniform dispersion and efficient processing.

 

Different Types Of Screw Configurations In Twin Screw Extruders
High-Fill Masterbatch Parallel Twin Screw Barrel for Extruder
Parallel Twin Screw Barrel for PVC Profile Extrusion
BATTENFELD-CINCINNATI Parallel Twin Screw Barrel
Small Parallel Screw Barrel for Extrusion Machinery

Conical Twin Screw
Conical twin-screw extruders feature a pair of screws that taper towards the discharge end. The large diameter at the feed section provides a high intake volume, allowing for efficient material feeding. As the material moves toward the narrower end, it experiences increased pressure and temperature, ensuring thorough mixing and melting. This configuration is particularly suitable for heat-sensitive materials and applications requiring high-pressure build-up, such as PVC pipe and profile extrusion.

Parallel Twin Screw
In parallel twin-screw extruders, the two screws are identical in diameter along their length. This design provides a considerable processing length, enabling prolonged residence time for the material. This can be beneficial for applications requiring extensive mixing or devolatilization, like compounding of filled or reinforced plastics. However, these machines may be less efficient at building up pressure than their conical counterparts.

Co-Rotating Twin Screw
Co-rotating twin-screw extruders have screws that rotate in the same direction. This results in high shear rates and excellent dispersive and distributive mixing. Because the material is constantly being transferred from one screw to the other, this configuration also provides good self-cleaning properties. It’s often used for compounding applications where the homogeneity of the product is critical, such as color masterbatches or engineering plastics.

Counter-Rotating Twin Screw
Unlike co-rotating designs, counter-rotating twin-screw extruders have screws that rotate in opposite directions. While this configuration can provide good conveying characteristics and high-pressure build-up, it often yields lower shear rates and mixing efficiency than co-rotating designs. Counter-rotating twin-screw extruders are commonly used for PVC pipe and profile extrusion due to their ability to handle high filler loadings

 

Categories of Screws and Barrels
Injection Moulding Barrels
In this type of screws barrels, the prints and processing ideas are very adaptable, and also you can create your customization. The product made from Injection Moulding Barrels remained for a long time, and it can assure a very smooth creation process. This is an entire steel molding barrel.

Plastic Manufacturing Business
This product category requires a proper structure, and it is an essential item for any plastic product manufacturing industry.

Extruder Screws
This is a procedure of generating any product by compelling the metal through an orifice and shaping the shape of any screw.

Extruder Barrels
This category is very identical to the Extruder Screws. Still, it is also related to the blow molding barrel, and it is a different product and is considered one of the most valuable products.

The Screw System Of a Parallel Twin-Screw Extruder

 

1

Conveying Section

The function is to transport materials and prevent backing.

2

Melting Section

In this section, the materials are fully melted and mixed through heat conduction and frictional shearing.

3

Plasticizing Section

Further melt and mix the ingredients of the material, with the function of distributing and dispersing mixing.

4

Discharge Section

Conveying and pressurizing, forming a certain pressure, making the materials more compact, and at the same time further mixing, to achieve the purpose of extrusion and granulation.

 
Working Principle of Parallel Twin Screw Barrel
 
01/

Construction
A parallel twin screw barrel is typically made of high-quality alloy steel or bimetallic materials that offer excellent wear resistance and durability. The barrel is precisely machined to ensure smooth operation and proper alignment with the twin screws.

02/

Twin Screw Design
The parallel twin screw barrel is designed to accommodate two parallel screws that rotate in the same direction. These screws have a consistent diameter along their length and are closely intermeshed to create conveying, kneading, and mixing effects.

03/

Material Conveying
The parallel twin screws are responsible for drawing in the plastic material from the feeding section and conveying it along the barrel. The intermeshing action of the screws enables efficient transport of the material from the feed zone to the discharge zone.

04/

Melting and Mixing
As the plastic material is conveyed along the barrel, the screws generate heat through friction, resulting in the melting of the plastic. The design of the screw elements facilitates mixing and homogenization of additives, fillers, or colorants, ensuring consistent material properties.

05/

Pressure Build-up
The parallel twin screw barrel is designed to create sufficient pressure within the extruder to overcome resistance and facilitate further plasticization of the molten material. This pressure build-up helps in achieving the desired extrusion output and product quality.

06/

Temperature Control
The barrel is equipped with heating and cooling systems to precisely control the temperature throughout the extrusion process. This temperature control is critical for achieving the desired melt viscosity and preventing material degradation.

Application of Parallel Twin Screw Barrel

 

Plastic Processing

It is widely used in the field of plastic processing, where it can be used to produce plastic pipes, plastic films, plastic profiles, plastic sheets, and other products.

01

Rubber Processing

It can also be used in the rubber processing industry to produce rubber pipes, rubber sheets, rubber profiles, and other products.

02

Chemical Fiber Processing

It has a wide range of applications in the chemical fiber processing industry, where it can be used to produce chemical fibers, chemical fiber fabrics, and other products.

03

Other Areas

In addition to the above-mentioned fields, extruders can also be applied in construction materials, packaging, automotive components, and other fields.

04

How to Choose High Quality Parallel Twin Screw Barrel
 

Check The Raw Materials Of The Screw And Barrel
The high-quality twin screw barrel is made of high-quality raw materials, which can achieve a continuous, stable, high-yield damage resistance ability.

 

Check The Surface Treatment Of The Screw And Barrel
The surface of a good screw and barrel is usually spray-welded nickel-based alloy powder or tungsten carbide alloy powder, which can greatly improve the wear resistance of the screw and prolong its service life.

 

Check The Production Process Of Screw And Barrel
A pair of good parallel twin screw barrels must undergo multiple heat treatment processes, such as quenching, tempering, qualitative, nitriding, etc., so as to meet various technical requirements.

How To Maintain Twin Screw Extruder Screw Elements

 

Observe Whether There Is Any Abnormality In The Extruder Screw Elements
To ensure the proper functioning of twin-screw elements, it is crucial to conduct regular visual inspections. This involves carefully examining the elements for any signs of wear, damage, or unusual conditions. Look out for abnormal wear patterns, such as grooves or uneven surfaces, as these can indicate potential issues that need to be addressed. Inspecting the quality of the processed materials is equally important. Take the time to scrutinize the materials for any deviations from the specified standards. This will help ensure that the final product meets the desired quality and performance requirements.

 

Regularly Clean Screw Elements
To maintain the efficiency and longevity of the twin screw extruder screw elements, it is essential to keep them free from residue and contaminants. Take the necessary steps to thoroughly clean the channels and openings, preventing the buildup of any unwanted substances. By doing so, you can prevent blockages and ensure smooth operation.

 

Keep Twin Screw Extruder Screw Elements Secure And Aligned
Regularly verify screws, bolts, and fasteners are securely tightened to avoid any potential issues. Additionally, confirm that the elements are properly aligned to prevent uneven wear and damage, which can compromise their performance.

 

Apply The Recommended Lubricant To All Moving Parts.
Regularly check and replenish the lubricant levels to maintain optimal performance and minimize wear and tear. This will help extend the lifespan of the twin screw elements and enhance their efficiency.

 

Monitor And Record Extruder Temperature
To ensure the ongoing performance and reliability of the twin screw elements, it is vital to monitor various factors. This includes regularly checking the extruder temperature to ensure it stays within the specified ranges. Monitoring the temperature helps prevent overheating, which can lead to damage and decreased efficiency.

Heating and Cooling of the Extruder Screw Barrel
 

 

Heating Method Of The Screw And Barrel Of Extruder

 

The heating of the machine adopts the way of resistance heating, and thermocouples are used for segmented temperature control and side detection. Resistance heating uses resistance to generate heat to heat the screw barrel, and then transfer the heat to the plastic in the barrel. Resistance heating mainly includes strip heaters, cast aluminum heaters, ceramic heaters, and so on. These heaters have the advantages of small size, easy manufacture, and maintenance.

Parallel Twin Screw Barrel for PVC Profile Extrusion
Parallel Twin Screw Cylinder For Pelletizing Machine

Heating Power Of The Extruder Screw Barrel

 

When determining the heating power of the twin-screw extruder barrel, in addition to meeting the heat required for plasticization, the productivity requirements of the injection molding machine must also be met to ensure that the barrel has a sufficiently fast heating rate. The heating time for small extruders is usually no more than 1 hour, and the heating time for medium and large machines is about 2 hours.

Cooling Of Extruder Screw Barrel

 

Under normal circumstances, the barrel is not equipped with a cooling control system, and natural cooling can meet the process requirements. However, if the temperature of the feed port is too high, "bridging" will occur at the feed port, making feeding difficult or even impossible.

180/340 Conical Double Screw Barrel
Factors to Consider When Choosing Parallel or Conical Twin Screw Extruder

The Difference Between Parallel and Conical Twin-Screw

 

Diameter
The diameter of the parallel dual screw is the same, and the diameter of the small end of the conical twin screw is different from the diameter of the large end.

 

Center distance
The center distance of the flat twin screw is the same, the two axes of the conical twin screw are at an angle, and the size of the center distance changes along the axis.

 

Length-to-diameter ratio
Parallel twin screw (L/D) refers to the ratio of the length of the useful part of the screw to the outer circle of the screw, and conical twin screw (L/D) refers to the ratio of the length of the useful part of the screw to the diameter of the small end, Conical twin-screw usually only indicates the diameter value (D/d) of the large end/small end of the screw.

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Our Certification
 
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FAQ

Q: What is the function of the screw extruder?

A: The principal function of a single screw extruder is to build up pressure in the polymer melt so that the polymer can be extruded through the die. Most of the single screw extruders are plasticating which means that the solid resin balls or powders melt in the screw due to the pressure.

Q: What is the process of a twin screw extruder?

A: In twin screw extrusion processing, the raw materials may be solids (powders, granulates, flours), liquids, slurries, and possibly gases. Extruded products are plastic compounds, chemically modified polymers, textured food and feed products, cellulose pulps, etc.

Q: What is a screw barrel used for?

A: The screw barrels are designed to be used in any type of plastic industry, which makes them ideally suited for plastic and other small-scale industries. Screw barrels can be used in blow molding machinery, food processing machinery, and cable wire machinery.

Q: What is the difference between conical and parallel screws?

A: In the plasticizing section, the intermeshing surface in the case of conical screws is larger than in parallel screws. This results in higher but controlled energy inputs through shear. On the other hand in the metering section, the intermeshing surface of the conical screws is less than the parallel screws.

Q: What are twin screws?

A: The twin screws are the heart of a twin screw extruder. They are responsible for conveying the material through the barrel, mixing the material, and generating heat through friction. The design of the screws can vary based on the specific application. For example, they may have different profiles, lengths, and diameters, and they may be configured for co-rotating or counter-rotating operations. The choice of screw design is crucial for the performance of the extruder and the quality of the final product.

Q: What is the difference between single and twin screw extrusion?

A: Mixing in single screws is first limited by the channel(s) the polymer follows down the screw. Twin screws can apply high shear in small increments through multiple changes in channel depth and/or mixing lobes while subjecting the overall melt mass to limited shear.

Q: How to maintain the parallel twin screw barrel?

A: When using parallel twin-screw barrels, regular maintenance should be performed. Take out the twin-screw components to check, measure, and evaluate the wear of the main parts, replace the parts that have reached the specified wear limit in time, and repair the damaged parts. The maintenance standards for twin screw extruder gearboxes are the same as for general standard gearboxes. Mainly check gears and bearings for wear and failure. The gearbox should use the lubricating oil specified in the machine manual, and add oil according to the specified oil level. Too little oil will lead to poor lubrication, which will reduce the service life of parts; too much oil will generate heat, consume a lot of energy, and the oil will easily deteriorate, which will also cause lubrication failure and damage the machine parts. When a substance is processed, the processed substance needs to obtain the energy required for physical changes and some chemical changes. A twin screw extruder is one of the more commonly used machines.

Q: What are features of parallel twin-screw barrel?

A: Parallel twin-screw barrel, reasonable screw structure design, good plasticizing effect, high output, and stable extrusion. The helical surface of the parallel twin-screw barrel is usually spray-welded with double alloy, which can effectively prolong the service life of the screw and barrel.
Parallel twin-screw barrel, large load torque, and low energy consumption. It can effectively avoid defects such as black lines and yellow lines in the extrusion process of printing plates and sheets.

Q: What are common material requirements for twin screw barrel screws?

A: High-temperature resistance, no deformation under high temperature. Wear resistance and long service life. Corrosion resistance, the material is corrosive. High strength, withstand large torque and high speed. It has a good cutting function.

Q: What are features of twin-screw ?

A: High output: Twin-screw extruder's two screws, rotating in sync, can better mix and convey materials, making the material more uniform during the extrusion process, improving production efficiency, and achieving high output.
Excellent plasticizing performance: The screw design allows materials to be better plasticized during the extrusion process, reducing material residue and waste, and improving product quality and stability.
Wide adaptability: It can process a variety of raw materials such as plastics, rubber, and chemical fibers, and can easily adjust the screw speed and temperature to meet the production needs of different products.
Easy maintenance and operation: The relatively simple structure makes operation and maintenance convenient, reducing the production and maintenance costs for companies.

As one of the most professional parallel twin screw barrel manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to buy customized parallel twin screw barrel at competitive price from our factory.

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