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With the continuous advancement of technology and rapid development of the industry, the demand for high-performance materials is increasing. Especially in industries such as adhesives and sealants, there are higher requirements for the quality and performance of materials. To meet these demands, twin-screw extruders, as an advanced plastic processing equipment, play a significant role in the continuous reaction extrusion granulation of materials like hot melt adhesives and polyurethane (PU). This article will delve into the application of Granuwel twin-screw extruders in the reaction extrusion granulation of hot melt adhesives and PU, highlighting their significant advantages. It will also discuss the most suitable methods for pelletizing, while introducing the wide range of applications for this technology.
Granuwel twin-screw extruders operate by rotating two intermeshing screws in the same direction within the barrel, facilitating the conveyance, compression, mixing, and melting of materials. Its unique working principle ensures that materials undergo intense shearing and dispersion during the extrusion process, thereby guaranteeing uniform mixing and thorough plasticization. The screw elements feature a modular design, allowing for customization based on material characteristics. Additionally, the barrel is modular with more efficient water-cooled segments. These features contribute to the high efficiency, versatility, and excellent material adaptability of the twin-screw extruder, meeting the processing needs of various industries.
Granuwel-65D Twin-Screw Extruder
The Importance of Reaction Extrusion Granulation for Hot Melt Adhesives and PU
Hot melt adhesives and polyurethane (PU) are two important polymer materials with widespread applications in industries such as adhesives and sealants. However, the processing of these materials is relatively complex, requiring precise control over temperature, pressure, and time to ensure product quality and performance. Traditional processing methods often suffer from low production efficiency and unstable product quality. The emergence of twin-screw extruders has provided a new solution for the continuous reaction extrusion granulation of hot melt adhesives and PU.
Hot Melt Adhesive Pellets
Polyurethane (PU) Pellets
Advantages of Granuwel Twin-Screw Extruders in Reaction Extrusion Granulation of Hot Melt Adhesives and PU
1. Efficient Mixing and Plasticization: The twin-screw extruder achieves efficient mixing and plasticization of materials such as hot melt adhesives and PU through intense shearing and dispersion. This helps improve the performance and quality of the products, meeting the industry’s demand for high-performance materials.
2. Precise Temperature and Pressure Control: The twin-screw extruder is equipped with advanced temperature control systems and pressure sensors, enabling precise control of temperature and pressure during the processing. This helps ensure product stability and consistency, enhancing production efficiency.
3. Continuous Production: The twin-screw extruder enables continuous reaction extrusion granulation of hot melt adhesives and PU, significantly improving production efficiency. Additionally, continuous production helps reduce manufacturing costs, enhancing the competitiveness of enterprises.
4. Customized Services: The twin-screw extruder can adjust screw combinations and process parameters according to different customer needs, achieving customized production. This helps meet customers’ requirements for specialized materials, expanding market opportunities.
Selection and Advantages of Pelletizing Methods
In the reaction extrusion granulation process of hot melt adhesives and PU, selecting an appropriate pelletizing method is crucial for ensuring product quality and production efficiency. Common pelletizing methods include underwater pelletizing and water ring pelletizing. The following will detail the advantages of each pelletizing method in this field.
Underwater Pelletizing：
- Advantages: Suitable for applications requiring precise particle shape and size. By introducing the melt directly into water for cooling and solidification, particles with regular shapes and smooth surfaces can be obtained. Additionally, the rapid cooling during underwater pelletizing helps reduce internal stress within the particles, enhancing their mechanical properties.
- Reactive extruders, due to the high fluidity of materials in the twin-screw barrel, require rapid cooling through the die head during pelletizing. Therefore, it is essential that the temperature of the circulating water for pelletizing be sufficiently low, necessitating a chiller to provide a continuous supply of chilled water.
- Why Choose: For materials like hot melt adhesives and PU that require high precision and performance, underwater pelletizing ensures synergy between particle quality and temperature control, meeting stringent application requirements.
GTE-75D Underwater Pelletizing Production Line
Water Ring Pelletizing
- Advantages: Compared to underwater pelletizing systems, it offers significant cost advantages, with simple equipment that is easy to operate and low maintenance costs. However, it is only suitable for pelletizing materials with higher hardness.
- Why Choose: For situations where both production processes and equipment costs need to be considered, water ring pelletizing is an ideal choice.
GTE-65D Water Ring Pelletizing Production Line
When choosing a pelletizing method, it is necessary to comprehensively consider factors such as product shape and size requirements, production efficiency, equipment investment, and subsequent processing. For the reaction extrusion granulation process of hot melt adhesives and PU, due to the special properties and application demands of these materials, underwater pelletizing or water ring pelletizing is usually recommended. These methods can produce particles with regular shapes, smooth surfaces, and stable performance, meeting the needs of industries like adhesives and sealants for high-performance materials.
Wide Range of Applications:
- Packaging Industry: Hot melt adhesives are used for carton sealing, cap closing, and label sticking; PU is used in high-end packaging materials.
- Automotive Industry: Bodily component bonding, interior fixing, soundproof material attachment; PU is used in seats, dashboards, and seals.
- Electronics and Electrical: Fixing of circuit board components, wire harness bundling, display assembly; PU is used in casings and protective layers.
- Construction Industry: Floor installation, wallpaper sticking, insulation material fixation; PU is used in insulation materials, waterproof coatings, and elastic flooring.
- Textiles and Apparel: Non-woven fabric bonding, garment making fixation; PU is used in high-performance fabrics and footwear materials.
- Medical and Healthcare: Band-aids, medical tape, surgical gowns; PU is used in artificial skin, medical device accessories, and advanced wound dressings.
In summary, the Granuwel twin-screw extruder not only improves production efficiency and product quality in the reaction extrusion granulation of hot melt adhesives and PU but also reduces production costs and enhances the market competitiveness of enterprises. With continuous technological advancement and growing market demand, the application prospects in this field will become even broader.