When buying a dual screw extruder, what factors should be considered?

When buying a dual screw extruder, what factors should be considered?

If you’re in the market for a dual screw extruder, there are a few things you need to consider to ensure you choose the right machine for your needs. twin screw extruders are used for a variety of applications, including compounding, reactive extrusion, devolatilization, and recycling, so it’s important to choose a machine that is designed for your specific application. In this article, we’ll go over the main factors you should consider when choosing a twin screw extruder.

Application

The first factor to consider when choosing a twin screw extruder is the application. twin screw extruders are used for a variety of applications, including compounding, reactive extrusion, devolatilization, and recycling. Each application has its own specific requirements, so it’s important to choose a machine that is designed for your specific application.

Compounding: twin screw extruders are used to mix and compound different ingredients, such as polymers, additives, and fillers, to create a homogenous material with consistent properties.

Reactive extrusion: twin screw extruders are used to carry out chemical reactions, such as polymerization and grafting, in a continuous process. This allows for precise control over the reaction conditions and can improve the properties of the final product.

Devolatilization: twin screw extruders are used to remove volatile components, such as water, solvents, and monomers, from a material. This is important in the production of high-quality polymers and other materials.

Recycling: twin screw extruders are used to process and recycle different types of waste materials, such as plastics, rubber, etc. The extrusion process can help reduce waste and create new products from recycled materials.

dual screw extruder application

Screw Configuration

Dual screw extruders come in different screw configurations, including co-rotating, counter-rotating, intermeshing, and non-intermeshing. Each configuration has its advantages and disadvantages, so choose the one that suits your needs.

Co-rotating: In a co-rotating twin screw extruder, the screws rotate in the same direction, either in a parallel or conical arrangement. This configuration is suitable for high shear and mixing applications, such as compounding and reactive extrusion.

Counter-rotating: In a counter-rotating twin screw extruder, the screws rotate in opposite directions, which creates a kneading and mixing action. This configuration is suitable for processing materials with high viscosity and for devolatilization applications.

Intermeshing: In an intermeshing twin screw extruder, the screws have interlocking teeth that mesh together as they rotate. This configuration is suitable for processing materials with low viscosity and for food processing applications.

Non-intermeshing: In a non-intermeshing twin screw extruder, the screws do not have interlocking teeth and rotate independently of each other. This configuration is suitable for processing materials with high viscosity and for devolatilization applications.

Size

Dual screw extruders come in different sizes, ranging from small laboratory units to large industrial machines. The size of a twin screw extruder is typically determined by the diameter of the screws and the length of the barrel. It’s important to choose a size that fits your production needs to ensure optimal performance and efficiency.

Small-scale twin screw extruders with screw diameters of 18mm are commonly used for research and development purposes or for small-scale production of speciality products. Mid-range twin screw extruders with screw diameters of 30-70mm are used for medium-scale production of a variety of products. Large-scale twin screw extruders with screw diameters of over 100mm are used for the high-volume production of products.

dual screw extruder sepcification

Material Compatibility

Dual screw extruders can process a wide range of materials, including plastics, rubber, and chemicals. However, not all materials are compatible with all types of twin screw extruders. It’s essential to choose a twin screw extruder that is compatible with the material you plan to process.

The design of the Twin screw extruder also plays a role in material compatibility. Different screw designs and barrel configurations are better suited for processing different types of materials. Additionally, processing conditions such as temperature, pressure, and residence time can affect material compatibility.

Throughput Capacity

The throughput capacity of a twin screw extruder is the amount of material that can be processed per hour. The throughput capacity of a twin screw extruder is typically measured in pounds per hour (lb/hr) or kilograms per hour (kg/hr). Choose a twin screw extruder with a throughput capacity that meets your production needs.

The screw design plays a crucial role in determining the throughput capacity of a twin screw extruder. Materials with higher viscosities or higher melting points may require more energy and longer residence times to process, resulting in lower throughput capacity.

Budget

Double screw extruders come in different price ranges, so choose one that fits your budget. The cost of a twin screw extruder can range from $20,000 to $200,000 or more, depending on the size and capacity of the machine.

In addition to the initial cost of the machine, there are also other factors to consider such as installation, training, and maintenance costs. It’s important to carefully consider the budget and requirements of your specific application when selecting atwin screw extruder to ensure that you get the best value for your investment.

Brand and Reviews

Choose a Reputable Brand and Read Reviews from Other Users

When selecting a twin screw extruder, it’s important to choose a reputable brand and read reviews from other users. This will ensure that you’re getting a quality machine that meets your production needs.

In conclusion, choosing the right twin screw extruder requires careful consideration of the size, material compatibility, throughput capacity, budget, and brand reputation. By taking these factors into account, you can select a machine that meets your production needs and provides the best value for your investment.

About us

Nanjing Granuwel Machinery CO., LTD is specializing in R&D design and manufacture of high polymer extruders, our team of top-level extrusion professionals provides the right extruder for your exact application.

Nanjing Granuwel Machinery CO., LTD
Nanjing Granuwel Machinery CO., LTD

We possess excellent capability of innovation and product development, and desire to provide best products for our customers through the improvement of equipment structure and reduction of equipment energy consumption through our practical experiences and technical innovation. 

For any question/inquiry,warmly welcome to contact us!!!

Tel: +86-25-86199956

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Emailinfo@granuwel.com

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