Single Screw Extruder
Why Choose Us
High Quality
Since it is founder, COLOWE has focused on quality and have stood out for the flexibility and attention given to every single need of each customer.
Customized services
During the design stage COLOWE study the best solutions for each customer's business, customising machines with each customer who choose COLOWE .
Professional Team
Our professional team collaborate and communicate effectively with one another, and are committed to delivering high-quality results. They are capable of handling complex challenges and projects that require their specialized expertise and experience.
Rich Experience
Our company has many years of production work experience. The concept of customer-oriented and win-win cooperation makes the company more mature and stronger.
What is Single Screw Extruder
Single screw extrusion is one of the main type of polymer processing operation. The principal function of a single screw extruder is to build up pressure in thepolymer melt so that the polymer can be extruded through the die. Most of the single screw extruders are plasticating which mean that the solid resin balls or powders melt in the screw due to the pressure. However, some single screw system can be used for mixing also. Single screw extruder is useful when pure polymer like HDPE is used.
（This website single screw is not sold separately, only when customers buy twin screw or three screw extruder granulator need to be sold with a single screw.）
What are the advantages of single screw extruders?
Simplicity and Cost-Effectiveness: Single screw extruders are relatively simple in design and construction, which makes them cost-effective to manufacture, operate, and maintain. They are often more affordable compared to their twin-screw counterparts.
Wide Range of Materials: Single screw extruders can process a broad range of materials, including plastics, rubber, metals, and food products. This versatility makes them suitable for various industries, such as plastics manufacturing, food processing, and pharmaceuticals.
Easy to Operate: These extruders are user-friendly and relatively easy to operate, making them suitable for operators with varying levels of expertise. Their straightforward design simplifies the learning curve.
Compact Design: Single screw extruders have a compact design, which is advantageous for facilities with limited space. They can be integrated into production lines more easily due to their smaller footprint.
Energy Efficiency: They are often energy-efficient, consuming less power compared to twin screw extruders, especially when processing certain materials. This can result in cost savings over time.
High Throughput: Single screw extruders can achieve high throughput rates, making them suitable for applications that require large-scale production. They can process significant volumes of material in a relatively short time.
Customization: Manufacturers can customize single screw extruders to meet specific production requirements. This adaptability allows for tailoring the extruder to the unique needs of a particular industry or application.
Low Maintenance: Their simple design reduces the complexity of maintenance and repairs, resulting in reduced downtime and lower maintenance costs.
Consistent Output: Single screw extruders offer consistent and uniform output, making them ideal for applications where product quality and consistency are paramount.
Scalability: They can be easily scaled up or down to accommodate changes in production volume, making them suitable for both small and large-scale operations.
Proven Technology: Single screw extruders have a long history of successful use in various industries, which provides confidence in their reliability and effectiveness.
Factors to Consider when Choosing a Single Screw Extruder
Material type and properties
Understanding the material you will be extruding is fundamental. Different materials have distinct properties that affect the extrusion process. Factors such as melt temperature, melt viscosity, and thermal stability influence the choice of extruder size and capacity. Materials with high viscosity or those that require high processing temperatures might need a larger extruder to accommodate the viscosity and heat requirements. On the other hand, materials with low viscosity might perform well with smaller extruders.
Output requirements
Determining the desired output is crucial in selecting the appropriate size and capacity for a single screw extruder. The output is generally measured in pounds per hour (lb/hr) or kilograms per hour (kg/hr). If you have high-volume production requirements, a larger extruder with higher throughput capacity will be necessary. Conversely, for smaller operations, a smaller extruder size with lower throughput capacity may suffice.
Extruder design and configuration
The design and configuration of the extruder play a significant role in the sizing and capacity selection process. Factors such as the length-to-diameter ratio of the screw, the compression ratio, and the specific screw geometry will influence the extruder's output capabilities. It is crucial to consult with experts or manufacturers to understand the optimal design and configuration for your specific application.
Energy efficiency
In today's environmentally conscious world, energy efficiency is a crucial consideration. While choosing the right size and capacity for a single screw extruder, it is essential to consider the energy consumption of the machine. Larger extruders may require more power to operate, which can lead to increased energy costs. Evaluating the extruder's energy efficiency can help optimize productivity while minimizing environmental impact and operating costs.
Future scalability
Consider your future growth and potential scalability when selecting a single screw extruder. Investing in an extruder with room for expansion can be a strategic move, especially if you anticipate an increase in production demands. Choosing a machine that allows for future upgrades and modifications can save you from the hassle of replacing the entire extrusion system down the line.
Feedstock for Other Plastics Processes: Widely used as mixers or compounders. The output from any extruder compounder will be chopped or granulated for forming the feed for any other process like injection moulding or extrusion.
Filaments: Used for twine, brushes, ropes, etc.
Nets: Used for packaging, soil stabilization, etc.
Plastic Coated Paper and Metal: Generally used for packaging.
Plastic Film: Generally, this is used for packaging and sealed into bags.
Plastic Insulated Wire: In the industry as well as home it is used for appliances, Electric power distribution, and communications, etc.
Plastic Pipe: Used for gas, water, drains etc.
Plastic Tubing: Used for automobiles, tubing and also hose for laboratories, etc.
Profile: Used for gaskets, home siding, doors, windows, tracks, etc.
Sheet: Used for signs, lighting, glazing, etc.
The single screw extruder works by using a combination of heat, pressure, and mechanical force to convert raw plastic material into a specific shape or form. The plastic material is fed into the extruder at one end of the barrel, and the screw rotates, pushing the material through the barrel.
As the plastic material moves through the barrel, it is subjected to intense heat and pressure, which causes it to melt and become more fluid. The screw also applies a mechanical force to the material, which helps to shape it as it moves through the barrel.
At the end of the barrel, the plastic material is forced through a die, which gives it its final shape or form. The extruded plastic material is then cooled and cut to the desired length.
Single screw extruders are used in a wide range of applications in the plastic processing industry. They are commonly used to produce pipes, films, sheets, and profiles, but they can also be used to manufacture a range of other plastic products, including:
* Wire and cable coatings
* Medical tubing
* Automotive parts
* Food packaging
• It is not allowed to run empty to avoid scratching the barrel. During no-load test run, the speed shall not be higher than 3rpm.
• Metal or other sundries shall be strictly prevented from falling into the hopper to avoid damaging the screw and barrel. To prevent iron impurities from entering the barrel, magnetic absorption parts or magnetic racks can be installed at the feeding points of the barrel. When feeding, check whether there is a magnetic frame in the bucket. If there is no magnetic frame, it must be put into it immediately. Frequently check and clean the metal objects attached to the magnetic frame. In order to prevent sundries from falling in, the materials must be screened in advance.
• The equipment shall always be kept clean and well lubricated. Wiping and lubrication shall be done well at ordinary times. Pay attention to the clean production environment. Do not let garbage and impurities enter the material to block the filter plate, which will affect the product output and quality and increase the head resistance.
• Before starting up each time, check whether there is material leakage and air leakage at the connection of the extruder, especially at the connection of the upper and lower stages and at the tail of the lower stage, that is, at the connection of the extruder and the transmission box. If there is any leakage, replace the sealing or locking screws immediately.
• In case of abnormal noise during the operation of the extruder, stop the extruder immediately for inspection or repair.
• Regularly calibrate the temperature control instrument, and check its correctness of adjustment and control sensitivity.
• The maintenance of the reducer of the extruder is the same as that of the general standard reducer. It is mainly to check the wear and failure of gears, bearings, etc., whether the cooling water is unblocked, and the lubrication of each rotating part. The reducer shall use the lubricating oil specified in the machine manual, and the oil shall be added according to the specified oil level. The oil is too little, the lubrication is poor, and the service life of the parts is reduced; Too much oil, high heat, high energy consumption, and easy deterioration of oil will also cause lubrication failure, resulting in damage to parts. The sealing gasket shall be replaced at the leaking part of the reducer in time to ensure the amount of lubricating oil.
• The inner wall of the cooling water pipe attached to the extruder is easy to scale, and the outer surface of the Teflon pipe or steel wire pipe is easy to rust. Careful inspection shall be carried out during maintenance. Too much scale will block the pipeline and prevent it from cooling. Serious corrosion will lead to water leakage Therefore, descaling and anti-corrosion cooling measures must be taken during maintenance. Regularly check the sealing and water leakage of various pipe filters and joints, and protect the cooling pipes.
• Timely check the locking of all fasteners of the machine, such as the fastening screws of the heating ring, the terminal blocks, and the external shield elements of the machine.
• In case of power supply interruption, all potentiometers must be reset to zero (that is, the upper and lower main machine speed must be reset to zero and the drive and heating must be stopped. After the voltage is normal, the machine must be reheated to the set value and can only be started after heat preservation.
• For the DC motor driving the screw to rotate, it is necessary to focus on the inspection of brush wear and contact, and it is also necessary to frequently measure whether the insulation resistance of the motor is above the specified value. In addition, check whether the connecting wire and other parts are rusty, and take protective measures.
• When the extruder needs to be out of service for a long time, anti rust grease shall be applied to the working surfaces of the screw, the die and the head. Small screws shall be suspended in the air or placed in special wooden boxes, and leveled with wooden blocks to avoid screw deformation or damage.
Single Screw Extruder Structure
A single screw extruder consists of a screw, drive mechanism, barrel, resin feed arrangement, and various controls. Through a heated barrel, a constantly turning screw will move the resin where it will be heated to a suitable temperature and then blended into a certain homogeneous melt.
Turbulent back pressure will be build-up which is going to push the melt out of this extruder in the form of the die. Sometimes the resin may not be completely melted in your basic extrusion screw. There will be a barrier screw designed for countering this problem. Often, additional flights are also attached to its transition section to separate both molten and solid plastic to certain different channels.
As this solid pellet will move forward it will melt because of shear against the wall. Thus, it will melt and flow into the liquid channel. In this way, the solid channel will gradually narrow and the liquid channel will widen.
Over the years, the design of extrusion screws has been improving, with various new ideas and innovations. Nowadays, single screws will be available that have got secondary flights that can improve speed by allowing faster melting.
Single screw extruders are available with many different types of accessories such as
• Automatic gravimetric feeders
• Heat and pressure controllers
• Heat exchangers
• Melt pumps
• Microprocessor control systems
• Static and dynamic mixers
• Vent vacuum units
Also, they are available with a wide range of geometrics of screws for different products and materials.
Our factory
Established in 2014,COLOWE is recognized one of China's poineer for twin screw extruder,banbury kneader compouding machine,two-stage screw compounding extruder,three screw compuding machine.since it is founder, COLOWE has focused on quality and have stood out for the flexibility and attention given to every single need of each customer.During the design stage COLOWE study the best solutions for each customer's business, customising machines with each customer who choose COLOWE .
FAQ
