What is a compounding extruder?

Compounding extruder is a high-tech plastic processing production equipment, which is mainly used to manufacture high-performance and multi-functional plastic composite materials. It achieves effects such as plastic modification, reinforcement and filling by mixing, dispersing and reacting raw materials with specific formulas under high temperature and pressure.

Specifically, in the compounding extruder, various raw materials are first weighed accurately in proportion and fed into the feeding area of the machine. Then, these raw materials go through three stages of preheating, melting and mixing, and finally form a homogeneous melt, which contains various additives and fillers. These additives and fillers can improve the strength, hardness, toughness, heat resistance, cold resistance, electrical properties and other performance indicators of plastic products.

Therefore, compounding extruder plays a vital role in the plastic industry. It can meet the market demand for high-quality, high-performance, high-value-added plastic products, and is suitable for various industries such as automobiles, electronics, machinery, construction, and medical equipment. At the same time, it also helps to improve production efficiency, reduce production costs, and reduce environmental pollution.

Workflow of compounding extruder

Compounding extruder is usually composed of main components such as feed zone, screw and sieve plate, which work together to realize the process of mixing, melting and dispersing of plastic raw materials. The following is the workflow of compounding extruder:

Feeding: Raw materials are precisely fed into the machine from the feeding area after pretreatment.

Preheating: The raw material is heated in the feeding area and gradually moves towards the screw. This helps warm up the cooled raw material, reducing heat loss.

Melting: When raw materials enter the screw, they are pushed forward and melted under high temperature and pressure. At the same time, the rotation of the screw can also fully mix the raw materials, so that different materials can be evenly dispersed together.

Dispersion: During the melting process, fine particle materials such as additives and fillers will be adsorbed on the dispersing element, and then dispersed evenly into the entire melt through the high-speed rotating dispersing element.

Release: The final melt is released through the sieve plate to form the required shape and size for subsequent processing or finished products.

Types of common compounding extruders

Co-rotating Twin Screw Extruder

This is the most commonly used compounding extruder, and its main feature is that it has two co-rotating screws, which can mix the raw materials in a shorter time and achieve higher shear rates. Due to its excellent mixing performance and adaptability, this type is usually used to manufacture high-quality, high-performance, multi-functional plastic composite materials, such as high-strength materials, fire-resistant materials, electronic-grade materials, etc.

Counter-Rotating Twin Screw Extruder

This compounding extruder is the opposite of the Co-rotating Twin-Screw Extruder, where the two screws are counter-rotating, but both have the same diameter and speed. They are mainly used to make pellets, such as plastic pellets, additive pellets, etc.

Intermeshing Co-rotating Twin Screw Extruder

The two screws of this compounding extruder have different diameters and rotate around an axis to form a gear-like structure. They have high power transmission efficiency and are capable of mixing and dispersing a wide variety of raw materials. Therefore, this model is usually used in the manufacture of high-fill plastic composites, polymer chemicals, etc.

Single Screw Extruder

This compounding extruder has only one screw and is usually used for processing materials with low shear and melt viscosity. Their production efficiency is relatively low, and they are suitable for the manufacture of low-cost, low-strength plastic composite materials, etc.

Common application fields of Compounding extruder

Automotive industry: Compounding extruder can be used to manufacture plastic composite materials with high performance, high toughness, high temperature resistance and low weight, such as automotive interiors, shells, pipes, tire pads and vibration control components.

Electronics industry: Compounding extruder can be used to manufacture composite insulating materials, conductive materials, antistatic materials and optical polymers, etc., and is widely used in electric power, communication, computer and electronic equipment.

Medical devices: Compounding extruder can be used to manufacture sterile, chemically resistant, high temperature resistant and low toxicity plastic composite materials, such as surgical instruments, medical equipment, medical packaging and drug delivery systems, etc.

Construction industry: Compounding extruder can be used to manufacture high-performance, high-strength and durable construction materials, such as composite flooring, sound insulation wall panels, roofing materials and window frame materials, etc.

Chemical industry: Compounding extruder can be used to manufacture polymer chemicals, plastic additives, lubricants and adhesives, etc.

Factors to consider when purchasing a compounding extruder

Production volume: According to the expected production volume, select the appropriate model and size. Large compounding extruders can handle more raw materials and achieve higher production efficiency, but for some small-scale production lines, smaller models are sufficient.

Material type: Considering the differences in melting point and melting characteristics of different materials, it is necessary to select a suitable screw structure and temperature control system to ensure that each raw material can be fully mixed and melted.

Process requirements: According to the required production process, select the appropriate model and configuration, such as dispersing elements, extrusion heads, sieve plates, etc.

Equipment performance: Pay attention to the power, speed, heating method and control system of the equipment to ensure that the equipment can meet the production requirements and have sufficient safety protection measures.

Economic considerations: Comprehensively consider equipment prices, use costs, maintenance costs, etc., and select the appropriate equipment model and brand to ensure economical and long-term stable operation.

Raw material cost: According to different raw material costs and processing difficulty, select the appropriate equipment model and processing technology to ensure cost control.

About us

As a professional compounding extruder manufacturer in China, Kairong is committed to providing high-quality, high-performance and stable and reliable plastic processing equipment. Our company has many years of experience and technology accumulation, has a first-class R&D team and production technology, and can provide customers with tailor-made solutions.

Our products include various models of compounding extruders for different raw material types and production requirements. Our equipment adopts advanced technology and high-quality components, featuring high efficiency, low noise, low energy consumption and easy operation.

Our service team is also very professional and thoughtful, able to provide customers with comprehensive pre-sales consultation and after-sales service to ensure the normal operation of the equipment and customer satisfaction.

Our products have been exported to all over the world, and are widely praised and trusted by customers. If you are looking for a high-quality, high-performance compounding extruder manufacturer, welcome to contact us for more information.

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