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Bimetallic Screw Barrel

Jinxing Screw: Your Professional Bimetallic 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 Bimetallic Screw Barrel

 

A bimetallic screw and barrel are key components of plastic extrusion machines. They are manufactured using two different materials – the barrel is made of a harder, wear-resistant alloy, and the screw is made of a high-performance steel alloy. This combination allows for improved durability, and resistance to wear and corrosion, and enhances the overall performance of the plastic extrusion process.

 
Features of Bimetallic Screw Barrel
 
01/

Wear Resistance
The primary benefit of bimetallic screw barrels is their wear resistance. The outer layer is typically made of a wear-resistant material, such as nitrided steel or tungsten carbide, which significantly reduces the wear and tear on the barrel during processing.

02/

Corrosion Resistance
Bimetallic screw barrels are also resistant to corrosion. This is important because the plastic resins used in processing can be highly corrosive and can damage the barrel. The inner layer is typically made of high-strength steel, which is resistant to corrosion.

03/

High-Temperature Resistance
Bimetallic screw barrels can also withstand high temperatures. This is important because plastic processing involves high temperatures, which can cause wear and tear on the barrel. The outer layer of the barrel is typically made of a material that can withstand high temperatures, which improves the longevity of the barrel.

04/

Cost-Effectiveness
Bimetallic screw barrels are more cost-effective than single-material barrels. This is because only the outer layer needs to be replaced when it wears out, which reduces maintenance costs and downtime.

 

Applications Of Bimetallic Screw Barrels
Bimetallic Screw Barrel for PVC Profile Extrusion Line
Bimetallic Screw Barrel for Injection Molding Machine
Bimetallic Single Screw Barrel for Extruder
Bimetallic Screw Barrel for PVC Pipe Extrusion Line

Enhanced Wear Resistance
The bimetallic construction of the screw and barrel, typically consisting of a hardened alloy core with a wear-resistant outer layer, provides superior durability and longevity.

 

Improved Mixing And Homogeneity
The design of a twin bimetallic screw and barrel ensures efficient melting, mixing, and homogenization of plastic materials, resulting in high-quality end products with consistent properties.

 

Increased Processing Capacity
Twin bimetallic screw and barrel systems can handle higher processing speeds and larger volumes, making them suitable for high-output production lines.

 

Versatility
Twin bimetallic screws and barrels can process a wide range of plastic materials, including PVC, PE, PP, ABS, and more, making them versatile for various applications. Twin bimetallic screws and barrels find applications in numerous industries and processes.

 

Plastic Extrusion
Twin bimetallic screws and barrels are commonly used in plastic extrusion processes to produce profiles, pipes, films, sheets, and other plastic products.

 

Injection Molding
These systems are also utilized in injection molding machines to manufacture plastic parts and components with high precision and repeatability.

 

Recycling
Twin bimetallic screws and barrels can be employed in recycling processes to efficiently process and transform plastic waste into valuable recycled materials.

Components of Bimetallic Screw Barrel

Screw

The screw is a cylindrical metal rod with a helical flight on its surface. As the screw rotates inside the barrel, it transports plastic pellets from the feed hopper to the die, while simultaneously heating and melting the plastic. The helical flight on the screw also provides a kneading action, which helps to mix and homogenize the plastic.

Barrel

The barrel is a hollow metal cylinder with heating elements that surround it. The barrel is designed to keep the plastic material at a specific temperature, which varies depending on the type of plastic being processed. The barrel also provides pressure to the plastic as it is being transported by the screw, which helps to ensure consistent melting and shaping of the plastic.

Bimetallic Parallel Twin Screw Barrel for Pelletizing Extrusion Line

 

Types of Barrels in Injection Molding

 

Integral Barrel
It is processed on the whole blank. This structure is easy to ensure high manufacturing accuracy and assembly accuracy and also can simplify the assembly work, which is convenient for the installation and disassembly of heating and cooling systems. Moreover, the heat is evenly distributed along the axial direction. Naturally, this kind of barrel requires higher processing and manufacturing conditions.

 

Combined Barrel
It means that a barrel is composed of several barrel sections. The experimental extruder and the exhaust extruder use the combined barrel. The former is for the convenience of changing the length of the barrel to adapt to the screw with no aspect ratio, and the latter is for setting the exhaust section. In a certain sense, the use of composite barrels is conducive to local materials and processing and is beneficial to small and medium-sized factories. But in fact, the machining accuracy of the combined barrel is very high. Each section of the combined barrel is connected with flange bolts. In this way, the uniformity of barrel heating is destroyed and the heat loss is increased. It is not convenient for the setting and maintenance of the heating and cooling system.

 

Bimetal Barrel
To not only meet the material requirements of the barrel for injection molding but also save valuable materials, many barrels are inlaid with an alloy steel bushing in the matrix of general carbon steel or cast steel. After the Bush is worn out, it can be removed and replaced. The Bush should be well matched with the barrel to ensure that the heat conduction on the whole barrel wall is not affected; There is no relative movement between the barrel and the bushing, and it can be easily removed, so it is necessary to select the appropriate matching precision, which is adopted by some factories.

 

 

Surface Treatment Techniques of Bimetallic Screw Barrel
 

 

Coating Services
Coating services involve applying a thin layer of material to the surface of the substrate, creating a protective barrier. Different coating materials like paints, enamels, powder coatings, and polymers are used depending on the application. Coatings not only shield the underlying material from corrosion and abrasion but also enhance its appearance.

 

Anodizing
Anodizing is a widely used surface treatment for metals, especially aluminum. It involves creating an oxide layer on the metal surface through an electrochemical process. The anodized layer not only enhances corrosion resistance but also allows for dyeing the metal in various colors, making it popular in architectural applications and consumer electronics.

 

Plating
Plating is the process of depositing a thin layer of metal onto a substrate using electroplating techniques. This surface treatment improves corrosion resistance, conductivity, and appearance. Common plating materials include chrome, nickel, gold, and copper.

 

Heat Treatment
Heat treatment alters the material’s microstructure through controlled heating and cooling processes. It is often used to improve hardness, toughness, and overall mechanical properties of metals and alloys.

 

Passivation
Passivation is commonly applied to stainless steel to remove impurities and create a passive oxide layer that enhances its corrosion resistance.

 

The Process Of Making Screws And Machine Barrels

 

The Production Process Of The Screw
Prepare Raw Materials
Screws are usually made of high-strength and wear-resistant materials, such as 38CrMo material.

Preparation Work Before Processing
This includes preparing a pipe with a diameter 10 times smaller than the inner diameter of a thick walled pipe? 15mm, twice the length of the thick walled pipe plus 150mm round steel, then a 100mm long rectangular prism is planed at one end, and a square hole is machined in the middle. The high-speed steel cutting head is fixed in the square hole with screws.

Turning Processing
First, perform rough turning of the inner hole and flange end face, then perform semi precision turning, precision turning of the inner hole (see circle) and flange end face, and finally perform turning of the machine barrel end thread and the machine barrel thread side end face.

Precision Machining
lncludes steps such as polishing the inner hole of the machine barrel and cutting the process chuck.

 

The Production Process Of The Machine Barrel
Prepare Raw Materials
The machine barrel is usually made of high-strength and wear-resistant materials, such as 38CrMo material.

Preparation Work Before Processing
This includes clamping the outer circle of the machine barrel (the outer circle that has been precisely turned cannot be machined), supporting the outer circle part that has been precisely turned with a center frame or roller, and aligning the inner hole as the reference.

Turning Processing
First, perform rough turning of the inner hole and flange end face, then perform semi precision turning, precision turning of the inner hole (see circle) and flange end face, and finally perform turning of the machine barrel end thread and the machine barrel thread side end face.

Marks Position Line and Hole Line
The Fitter Marks The Position Line Of The Connecting Screw Hole And The Feed Hole Line. This step is to ensure the accurate position of the screw hole and the feed hole.

Drilling and Milling
lncluding steps such as drilling flange connection holes and milling machine barrel feed holes.

Deburring
This is to ensure the smoothness of the surface of the barrel.

 

Matching Of Screw And Barrel
The fit between the screw and the barrel is very important, and the size of the fit gap between them can affect the production capacity, power consumption, service life, and machining cost of the extruder. Generally speaking, the fit clearance between the screw and the barrel should be selected based on the processing conditions and the performance of the material being processed, with a general value of (0.002-0.005) d.

 

Factors to Consider When Choosing Bimetallic Screw Barrel

 

 

Parallel Twin Screw Barrel for PVC Profile Extrusion

Material Compatibility

The first and most crucial factor to consider is the material compatibility of the screw and barrel. Different plastic materials require specific screw and barrel configurations to ensure proper melting, mixing, and extrusion. It is essential to choose a bimetallic screw and barrel that is compatible with the type of plastic material you will be processing.

Screw Design

The design of the screw plays a significant role in the extrusion process. Different screw designs, such as barrier screws, mixing screws, and barrier-mixing screws, offer unique advantages for specific applications. Consider the type of plastic products you will be manufacturing and select a screw design that complements your production requirements.

Barrel Construction

The construction of the barrel is another critical factor to consider when choosing a single bimetallic screw and barrel. Bimetallic barrels are known for their durability and resistance to wear and corrosion, making them ideal for high-temperature and abrasive extrusion processes. Ensure that the barrel construction is robust enough to withstand the demands of your plastic extrusion operation.

Performance Specifications

When selecting a single bimetallic screw and barrel, it is essential to consider the performance specifications, such as screw diameter, length-to-diameter ratio, and compression ratio. These specifications will impact the extrusion rate, melt quality, and overall efficiency of the plastic extrusion process. Choose a screw and barrel that meets your desired performance criteria.

Maintenance and Service

Regular maintenance and servicing of the screw and barrel are crucial to ensure long-term performance and reliability. Consider the ease of maintenance and availability of spare parts when selecting a single bimetallic screw and barrel. Opt for a reputable manufacturer that offers excellent customer support and after-sales service.
Cleaning Method of Bimetallic Screw Barrel

 

Cleaning Of Extruder Screw
Remove
Remove the extruder screw head, check ring and thrust ring.

Brush
Use a brass brush to remove the resin residue on the extruder screw, and wipe off the residual melt with a waste cotton cloth.

Polish
Check the external quality of the different types of extruder screws. If there are small scratches, they can be lightly polished with fine gauze. If there are large scratches, the cause should be found out and corrected.

Wipe
After the screw of the extruder is cooled to normal temperature, wipe off the oil stains on the screw of the extruder with a flux that is not easy to burn.

Repeat
Use the same method to clean the extruder screw head, check ring, and thrust ring. When cleaning, pay attention not to damage the appearance of the parts. Before installing the screw, apply molybdenum disulfide grease evenly to the screw thread of the extruder screw and the screw head to prevent the thread from rusting and seizing.

 

Cleaning Of Extruder Barrel
Remove The Resin
Use a brass brush to remove the resin residue on the inside and outside of the barrel of the extruder, wrap the waste cotton cloth on the end of the long mallet, and wipe off the residual melt on the inside and outside.

Lubricate The Wet Waste And Clean
When the temperature of the barrel drops to 30-50 degrees, lubricate the wet waste cotton cloth with a solvent that is not easy to burn, wrap it around the end of the mallet, and continue to clean the inside and outside of the extruder barrel.

Inspect
Check the quality of the inside and outside of the barrel after cleaning.

Nozzle
During cleaning, the nozzle and extruder barrel should be cleaned at the same time.

 

Our Factory
 
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Our Certification
 
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FAQ

Q: What is a bimetallic screw barrel made of?

A: Bimetallic screw barrel are made of two metals or two alloys of metals and mostly coated with extra layer of carbides and other commercial coating material. Bimetallic screw barrel are not different type of screw barrel, like advanced designing etc. A same design screw can be made in Nitrided way and Bimetallic way.

Q: What is the working principle of screw and barrel?

A: The basic working principle of the extruder screw and barrel is to melt and compact the polymer, push it to the mold at constant pressure, constant temperature, and constant speed, and form a parison in the molten state of the product through the mold.

Q: What is a bimetallic screw?

A: A bimetallic screw is made up of two metals or alloys. As the name suggests, in a bimetallic screw, two metals are fixed together. A bimetallic screw is used to increase the life of the entire screw and barrel. That is because a bimetallic screw works better than a mono-metallic screw.

Q: What are bimetallic screw barrels?

A: A bimetallic screw barrel is a type of barrel that is made up of two different alloys or metals. It is designed to improve the performance and durability of extrusion and injection molding machines. The outer layer is typically made of a wear-resistant material, such as nitrided steel or tungsten carbide, while the inner layer is made of a high-strength steel material. The bimetallic screw barrel design provides several benefits, including increased resistance to wear, corrosion, and high temperatures. Additionally, the bimetallic barrel design is more cost effective than a single material barrel because only the wear-resistant outer layer needs to be replaced when it wears out.

Q: What need to be considered when buying bimetallic screw and barrel ?

A: Consider factors such as:
- Material Compatibility: Ensure that the screw and barrel are suitable for the type of plastic material you will be processing.
- Size and Configuration: Determine the appropriate size, diameter, and configuration of the twin bimetallic screw and barrel based on your production requirements.
- Quality and Reliability: Choose reputable manufacturers who offer high-quality twin bimetallic screw and barrel systems with reliable performance and durability.

Q: What advantages of bimetallic barrels and how it compares with nitrided barrels?

A: Bimetallic barrels provide more than 3 times more protection against abrasion & corrosion compared to nitrided barrels, nitrided barrels are surface hardened about 0.5mm depth while if lower than 0.3mm deep, hardness will become much lower, but bimetallic barrels normally have a thickness that can reach at least 2-3mm depends on size and alloy, and whole bimetallic layer same hardness above 56HRC

Q: Are Bimetallic all the same and how many options we can offer?

A: Bimetallic is more a processing way, not an exact grade, depending on the alloy used, it can vary a lot, normally used have iron-based, nickel-based & cobalt-based alloys and also with different percentages of tungsten carbide (WC). Each alloy is applicable for different polymer processing to prevent corrosion & abrasion, we offer many grades per your exact requirement

Q: What is the lifespan of a bimetallic screw and barrel?

A: The lifespan of a bimetallic screw and barrel depends on various factors, including the type of plastic material processed, operating conditions, and maintenance practices. Generally, a properly maintained bimetallic screw and barrel can last significantly longer than traditional configurations, reducing downtime and replacement costs.

Q: Can a single bimetallic screw and barrel be used for different types of plastics?

A: Yes, a single bimetallic screw and barrel can be designed to accommodate a wide range of plastic materials. The versatility of this configuration allows manufacturers to process different types of plastics without the need for frequent screw and barrel changes.

Q: How does a single bimetallic screw and barrel reduce maintenance downtime?

A: The integration of the screw and barrel into a single bimetallic unit simplifies the assembly and disassembly process. This reduces the time required for maintenance and minimizes production downtime. Additionally, the enhanced wear resistance of bimetallic screws and barrels reduces the need for frequent maintenance, further optimizing production efficiency.

Q: Are there any limitations to using a single bimetallic screw and barrel?

A: While a single bimetallic screw and barrel offer numerous advantages, it is essential to consider the specific requirements of your plastic manufacturing process. Factors such as the type of plastic material, desired output, and processing conditions may influence the selection of the most suitable screw and barrel configuration.

Q: How can I choose the right single bimetallic screw and barrel for my plastic manufacturing needs?

A: Selecting the right single bimetallic screw and barrel involves considering factors like the type of plastic material, desired output, processing conditions, and extruder specifications. Consulting with experienced manufacturers and suppliers can help you make an informed decision based on your specific requirements.

Q: What is bimetallic coating?

A: The mixing of two (or more) metals is called an alloy. Screw Barrel with Bi-metal-lic properties. Bimetallic screw barrel are made of two metals or two alloys of metals and mostly coated with extra layer of carbides and other commercial coating material.

Q: What is the working principle of screw and barrel?

A: The basic working principle of the extruder screw and barrel is to melt and compact the polymer, push it to the mold at constant pressure, constant temperature, and constant speed, and form a parison in the molten state of the product through the mold.

Q: What is a bimetallic screw barrel made of?

A: Bimetallic screw barrels are made up of superalloys, carbides, and borides blends with performance alloys.

Q: What is the ratio of barrel screws?

A: The general L/D ratio of Barrel/Injection screws uses 20:1 in injection molding. In a rubber extruder, the L/D ratio of the barrel is generally 12:1 to 18:1. Hence, the L/D ratio of the barrel in extrusion generally falls in the range of 10-30.

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

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