How does Flat Twin Screw technology achieve efficient material mixing, conveying and processing?

In the modern industrial system, efficient mixing, conveying and processing of materials are the core links that determine product quality, production efficiency and energy utilization. Especially in the fields of plastic modification, polymer material synthesis, fine chemicals, food processing and pharmaceuticals, the complexity of material handling places strict requirements on equipment performance. Parallel Twin Screw technology has become an indispensable key equipment in these fields with its unique structural design and excellent performance.

Background of Parallel Twin Screw

Parallel Twin Screw technology originated in the 1950s and was originally used for plastic extrusion molding. With the advancement of material science and processing technology, its application areas have gradually expanded to high-value-added fields such as highly filled composite materials, reactive extrusion, and food processing. Compared with single-screw extruders, Parallel Twin Screw realizes the decoupling and optimization of material conveying, mixing, plasticizing, and reaction processes through the synergistic effect of twin screws, and shows advantages in processing high-viscosity, heat-sensitive, and easily degradable materials.

What is Parallel Twin Screw?

1. Definition

Parallel Twin Screw is a device consisting of a pair of precision-machined shafts perpendicular and a pair of mutually perpendicular shafts perpendicular. Through the rotational motion of the screw, efficient mixing, conveying and processing of materials are achieved, ensuring the uniformity, continuity and quality of the materials.

2. Structure

Shafts perpendicular: It is the core component of Parallel Twin Screw. They are manufactured through precision machining with high accuracy and consistency. The thread design and pitch of the screw are precisely calculated to ensure the uniformity and consistency of the material during processing. The rotational motion of the screw can fully mix the material, avoid stratification and agglomeration of the material, and improve the quality and performance of the material.

Shafts perpendicular: It is the support and drive component of Parallel Twin Screw. They are manufactured through precision machining with high accuracy and consistency. The design of shafts perpendicular can reduce the weight and friction of the equipment and improve the operating efficiency and life of the equipment. The rotational motion of shafts perpendicular can drive the rotation of the screw to achieve efficient mixing, conveying and processing of materials.

Working principle of Parallel Twin Screw

The working principle of Parallel Twin Screw is based on the rotational motion of the screw and the flow of materials in the screw groove. When the screw rotates, the material is pushed by the screw thread to move along the screw axis. Due to the gap between the screws and the special design of the screw thread, the material will be subjected to shear force, extrusion force and friction force during the movement, achieving mixing, conveying and processing.

In the conveying section, the screw thread design enables the material to be smoothly conveyed from the feed port to the processing area. As the material enters the compression section, the screw groove volume gradually decreases, the material is compressed and plasticized, the temperature and pressure gradually increase, and the viscosity and fluidity of the material change. In the mixing section, the screw thread design becomes more complex, and the material is subjected to strong shear and stirring in the screw groove to achieve full mixing and uniform distribution.

Basic structure and design of Parallel Twin Screw

Parallel Twin Screw consists of a pair of precision-machined parallel screws and a pair of mutually perpendicular hollow shafts. The surface of the screw is specially designed with a complex thread structure to control the flow and mixing of the material. The design of the hollow shaft reduces the weight of the equipment and also improves the rigidity and stability of the screw, ensuring reliability and durability during high-load operation. The screw thread structure usually includes a conveying section, a compression section and a mixing section. The conveying section is responsible for conveying the material from the feed port to the processing area, the compression section compresses and plasticizes the material through the gradually decreasing screw groove volume, and the mixing section achieves full mixing and uniform distribution of the material through complex screw thread design.

1. Geometric characteristics of parallel twin screw system

Screw configuration: Parallel Twin Screw adopts a combination of building block screw elements, including conveying section, compression section, mixing section and special function section. The thread depth, pitch and helix angle of each section can be designed independently to adapt to different material characteristics.
Axial clearance control: The clearance between screws is usually controlled at 0.1-0.5mm, which not only ensures self-cleaning, but also avoids excessive shearing and material degradation.
Hollow shaft design: The interior of the screw adopts a hollow structure, and precise temperature control is achieved through circulating medium.

2. Meshing principle and self-cleaning mechanism

The meshing mode of the twin screw is divided into full meshing and partial meshing. The full meshing design forms a forced material conveying channel through the close cooperation between the screw ridge top and the screw groove of the other screw, which significantly improves the mixing efficiency. Its self-cleaning property comes from the periodic scraping of the other screw groove when the screw rotates, preventing material retention and degradation.

3. Modular design concept

Modern Parallel Twin Screw widely adopts modular design, and the screw elements are connected by splines, which can be quickly replaced to adapt to different process requirements.

Material and surface treatment features of Parallel Twin Screw

Parallel Twin Screw is made of high-strength, corrosion-resistant metal materials to ensure good mechanical properties and durability under high load and high temperature environments. The choice of materials improves the strength and toughness of the screw and enhances its corrosion resistance, enabling it to operate stably and for a long time in various harsh industrial environments. The surface is plated, hardened and polished to enhance the performance of the screw. The plating treatment coats a corrosion-resistant and wear-resistant metal layer on the surface of the screw to enhance its corrosion and wear resistance. The hardening treatment improves the hardness and wear resistance of the screw surface and extends its service life through methods such as heat treatment and carburizing. The polishing treatment makes the screw surface smooth, reduces the adhesion and friction of the material on the screw surface, and improves the fluidity and processing efficiency of the material.

What are the main functions of Parallel Twin Screw?

1. Material mixing

Parallel Twin Screw achieves efficient material mixing through the rotation of the screw to ensure the uniformity and consistency of the material. The screw thread design and pitch are precisely calculated to ensure the uniformity and consistency of the material during processing. The rotation of the screw can fully mix the material, avoid stratification and agglomeration of the material, and improve the quality and performance of the material.

2. Material conveying

Parallel Twin Screw achieves efficient material conveying through the rotation of the screw to ensure the continuity and stability of the material. The screw thread design and pitch are precisely calculated to ensure the continuity and stability of the material during processing. The rotation of the screw can continuously convey the material, avoid material blockage and interruption, and improve the conveying efficiency and stability of the material.

3. Material processing

Parallel Twin Screw achieves efficient material processing through the rotation of the screw to ensure the quality and performance of the material. The screw thread design and pitch are precisely calculated to ensure the quality and performance of the material during processing. The rotating motion of the screw can fully process the material, avoid damage and deformation of the material, and improve the processing quality and performance of the material.

Function	Description
Material Mixing	Through the rotation of the screw, efficient mixing of materials is achieved, ensuring the uniformity and consistency of materials, avoiding stratification and agglomeration of materials, and improving the quality and performance of materials.
Material Conveying	Through the rotation of the screw, efficient transportation of materials is achieved, ensuring the continuity and stability of materials, avoiding blockage and interruption of materials, and improving the transportation efficiency and stability of materials.
Material Processing	Through the rotation of the screw, efficient processing of materials is achieved, ensuring the quality and performance of materials, avoiding damage and deformation of materials, and improving the processing quality and performance of materials.

Performance advantages of Parallel Twin Screw

Parallel Twin Screw has efficient mixing capabilities and ensures material uniformity through the interaction between the screws. The unique structural design and thread shape enable the material to be fully mixed and dispersed during the conveying process, avoiding the stratification and unevenness of the material. The Parallel Twin Screw also has high conveying efficiency, can realize continuous and stable conveying of materials, and reduce the loss and waste of materials during the conveying process. The selection of high-quality materials and surface treatment ensures the long life and high performance of the Parallel Twin Screw, and reduces the maintenance and replacement costs. The design of the Parallel Twin Screw focuses on energy saving and consumption reduction. By optimizing the screw structure and reducing friction loss, it reduces operating energy consumption, reduces operating costs, and ensures processing results.

What should be paid attention to when installing and debugging the Parallel Twin Screw?

1.Installation precautions:

Equipment inspection: Before installation, the equipment must be fully inspected to ensure that it is intact, all components are complete and not damaged or missing, and the packaging is intact to confirm that it has not been damaged during transportation.

Follow the instructions: During the installation process, the equipment should be strictly operated in accordance with the installation instructions. The instructions describe the installation steps and precautions in detail to ensure the correct installation of the equipment. Special attention should be paid to the horizontality and verticality of the equipment to ensure the accuracy of the installation.

Equipment debugging: After the installation is completed, the equipment needs to be debugged to ensure its normal operation. During the debugging process, check whether each component is working properly, whether there are any abnormalities, and test the equipment to ensure that it can work efficiently.

2.Debugging precautions:

Equipment inspection: Before debugging, the equipment also needs to be fully inspected to ensure that it is intact, all components are working properly, there are no abnormalities, and the packaging is intact and there is no damage caused during transportation.

Operate according to the instructions: During the debugging process, the equipment should be operated strictly in accordance with the debugging instructions of the equipment. The instructions describe the debugging steps and precautions in detail to ensure the normal operation of the equipment. During debugging, you need to pay attention to the operating status and parameters of the equipment to ensure its normal operation.

Equipment testing: After debugging, the equipment needs to be fully tested to ensure its efficient operation. During the test, check whether each component is working properly, whether there are any abnormalities, and test the equipment to ensure that it can operate normally and efficiently.

Steps	Installation precautions	Debugging precautions
Equipment inspection	During installation, conduct a comprehensive inspection of the equipment to confirm that no damage has occurred during transportation.	During debugging, conduct a comprehensive inspection of the equipment to ensure that each component is working properly and there are no abnormalities.
Operate according to the instructions	During the installation process, strictly follow the installation instructions of the equipment and pay attention to the horizontality and verticality of the equipment.	During the debugging process, strictly follow the debugging instructions of the equipment and pay attention to the operating status and parameters of the equipment.
Equipment debugging	After installation, debug the device to ensure it is functioning properly. During debugging, check whether each component is functioning properly and test the device.	After debugging, conduct a comprehensive test on the device. During testing, check whether each component is functioning properly.

Efficient mixing mechanism of Parallel Twin Screw

1. Shear mixing:

The rotation of the screw causes the material to be subjected to strong shear force in the screw groove, and the relative movement and friction between the material molecules make the material fully mixed. Shear mixing can break the agglomeration and agglomeration of the material and improve the dispersion and uniformity of the material.

2. Convection mixing:

The screw thread design makes the material form a complex flow path in the screw groove, and the material constantly changes direction and speed during the flow process to achieve convection mixing. Convection mixing can promote mutual diffusion and penetration between materials and improve the mixing effect of materials.

3. Diffusion mixing:

In Parallel Twin Screw, the diffusion effect between material molecules also plays an important mixing role. The rotation of the screw and the special design of the thread form a high shear and high turbulence environment in the screw groove, which accelerates the diffusion speed between material molecules and improves the mixing effect.

Efficient conveying mechanism of Parallel Twin Screw

1. Continuous conveying:

Parallel Twin Screw realizes continuous conveying of materials through the rotation of the screw. The material moves axially in the screw groove. The conveying process is stable and reliable, which can meet the needs of continuous production.

2. Quantitative conveying:

The thread design of Parallel Twin Screw enables the volume and flow of materials in the screw groove to be precisely controlled, which can achieve quantitative conveying of materials and ensure the stability and consistency of the production process.

3. High-pressure conveying:

In Parallel Twin Screw, the material is compressed and plasticized in the compression section, and the temperature and pressure gradually increase. The thread design of the screw enables the material to be smoothly conveyed under high pressure, which is suitable for conveying high-viscosity and high-density materials.

Efficient processing mechanism of Parallel Twin Screw

1. Plasticizing processing:

In Parallel Twin Screw, the material is compressed and plasticized in the compression section, the temperature and pressure gradually increase, the viscosity and fluidity of the material change, and the material is plasticized. Plasticizing processing can effectively improve the processing performance of the material, improve the processing quality and production efficiency of the material.

2. Reaction processing:

In Parallel Twin Screw, the material is subjected to strong shearing and stirring in the mixing section, the interaction and reaction speed between the material molecules are accelerated, and the reaction processing of the material is realized. Reaction processing can effectively promote the chemical reaction between materials and improve the reaction effect and product quality of the material.