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What Is Twin Screw Compounding Extruder?

What is compounding?

Compounding is a manufacturing process that involves blending or mixing multiple materials together to create a new and often customized product. This process is commonly used in various industries, including plastics, pharmaceuticals, chemicals, and food production, to achieve specific properties or characteristics in the final product that may not be achievable with individual materials alone.

In the context of plastics and polymers, compounding typically involves mixing a base polymer with various additives, fillers, colorants, or reinforcing agents to enhance the material’s properties. For example, compounding can be used to make plastics more durable, flame-resistant, colorful, or suitable for specific applications.

In the pharmaceutical industry, compounding refers to the preparation of customized medications by combining specific drug ingredients in the required dosage forms and strengths to meet individual patient needs. This is particularly important for patients who require medications in forms or dosages that are not readily available in commercial pharmaceutical products.

In essence, compounding is a versatile process used to create tailored products or formulations by carefully combining different components to achieve desired characteristics or meet specific requirements.

Compouding process of twin screw compounding extruder

Compounding extruders serve the purpose of blending two or more materials continuously to create a consistent mixture. This is achieved by employing distributive and dispersive mixing techniques to appropriately blend the components within the compound. In distributive mixing, the components are evenly dispersed throughout space in a consistent ratio without undergoing any breakdown. Conversely, dispersive mixing involves the breakdown of agglomerates or clusters. Effective dispersive mixing demands the inclusion of substantial energy and shear forces within the process. In this article, we mainly introduce the compounding process of twin screw compounding extruder in detail.

twin screw compounding extruder

The compounding process of a twin-screw compounding extruder is a sophisticated and highly controlled method for mixing and processing materials. This process involves the introduction of raw materials, including a base polymer and various additives, into the extruder’s feeding system. As the twin screws rotate within the extruder barrel, the materials are melted, mixed, and blended thoroughly, resulting in a uniform and homogenous compound. This intensive mixing action ensures that additives, fillers, and other components are evenly distributed throughout the final product. The compound is then shaped using a die and can be further processed, cooled, and packaged based on its intended application.

Advantages of using twin screw compounding extruder

Enhanced Mixing and Dispersion

One of the standout advantages of twin screw compounding extruders is their exceptional mixing capabilities. The dual-screw design, with screws intermeshing either co-rotating or counter-rotating, creates a highly turbulent flow of materials. This turbulent flow enhances mixing and dispersion, resulting in a more homogenous and uniform compound. It’s particularly beneficial when compounding materials with additives, fillers, or pigments, ensuring that these components are evenly distributed throughout the matrix.

Precise Temperature Control

Twin screw compounding extruders offer precise temperature control along the entire processing path. This temperature consistency is crucial when working with heat-sensitive materials or when conducting reactive extrusion processes. Operators can fine-tune the temperature profiles of different zones within the extruder, optimizing material properties and ensuring product quality.

Flexibility and Adaptability

Twin screw compounding extruders are highly adaptable and can be customized to suit various applications. By altering the screw design, configuration, and barrel elements, manufacturers can tailor the extruder to meet specific compounding requirements. This flexibility allows for the production of a wide range of compounds, from thermoplastics with additives to complex pharmaceutical formulations.

Reduction in Material Waste

The efficient mixing and dispersion capabilities of twin screw compounding extruders contribute to reduced material waste. By ensuring that additives and fillers are evenly distributed, manufacturers can maximize the use of costly materials and minimize product defects.

Energy conservation

In a twin-screw compounding extruder, it’s a common practice to adjust the temperature at multiple stages while heating during the process. Typically, the temperature of the die takes a bit longer to reach the desired target compared to the temperature of the screw. In such cases, it’s customary to maintain the screw’s warmth until the die temperature gradually catches up to the set temperature before commencing operations. This approach is known for its efficiency and energy-saving characteristics.

Common application of twin screw compounding extruder


Due to the strong mixing and dispersion function, twin screw is the most common machine used for masterbatch production, such as color masterbatch, filler masterbatch, functional masterbatch. Of those, carbon black, nano powder and high concentrate color masterbatch is highly special to produce. For carbon black and nano powder, the bulk density is very small and difficult to input into the extruder by a normal feeder. So how to solve this feeding issue would be critical. Meanwhile, the screw L/D and screw profile will be very special for those kinda materials processing to get a good mixing, dispersion as well as a efficient feeding rate.

COWELL will have more professional solutions for you.



There are various different thermoplastics which are used for modern industry frequently to lighten the products. e.g TPE, TPV, TPU,TPR,TPEE, POE,EVA,etc. Different materials requires a specific solutions to get a good functions due to different physical propeties and hardness differences.

COWELL can give you more customized solutions on those

Engineering Compounds

Engineering plastics are becoming more and more popular in our daily life. the applications are from automobile, home appliance, sports devices to aerospace .Epecially the new engergy automobile industry nowadays. The engineer plastc plays a crucial role. Many car parts were changed from steel to high strength platics. Those modified plastics have the same strength as steel, but the weight is less than the steel, thus save the energy on oil or electricity.

To do the engineering compouns require a better quality extruder and its parts. High torque twin screw extruder has a much better performance on the comoounding, stability, and output concerned. The screw, barrel, and shaft requires more wear-resistance to have a constant operation and reducing the changover time. Particularly when we process fiber glass, the important issue is to try to minimize the wearness of the screw and barrel during the compounding.

COWELL has pretty much experiences on the engineering plastics compounding know-how thanks to the cooperation with our esteemed customers who are engaging in this industry for decades.


Biodegradble plastics

In order to have a green earth, biodegradable materials are more and more popular. Many new biodegradable materials have been explored , such as PLA, PBAT,PVA, PHA,etc. Currently the main application of those bio-degradable materials are straws, cups, dishes, plastic bags.

COWELL has been committed to bio-degradable materials solutions. Customized twin screw extruders have been launched and get very postive compliments from various customers in this industry.


Food Extrusion

Another interesting application of twin is food processing. It gets widely used nowadays for pet food, TVP, HMMA, nutritient rice,etc

The main fuction of the extruder is to mix various ingredients in the extruder with less shearing heat generated at a low temperature. The food ingredients mixing and texturized in the extruder with a proper cooling at the end.

Further more, the extruder parts should be hygenie designed for food.

You can trust COWELL on this project solution.

Pharmacy Extrusion

Twin screw extruder is used for pharmacy processing. Compared to plastics extruder, the requirement is extremely strict. Not only mixing and dispersion, but also the pellets have to pass through quite strict checking and testing. The temperature, screw speed, screw profile, cooling, feeding rate of different ingredients must be very accurate to meet the recipe. Meanwhile, the materials of the whole extruder should be meet the requirement of hygenie. The workshop must be GMP standard to avoid any possible contamination.

In summary, the twin screw compounding extruder is a remarkable engineering achievement with far-reaching applications. Its precision and efficiency in blending materials have made it an indispensable tool across diverse industries. As technology continues to evolve, we can expect even more groundbreaking developments in material compounding, reaffirming the extruder’s role as a cornerstone of modern manufacturing, customization, and efficiency.


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