Principle of UPVC Profile Formulation Composition and Adjustment
Date:2023-2-05 Author:hcscrew
Description: Learn the principles of UPVC profile formulation and how to make adjustments for optimal results. Explore the science behind UPVC profile manufacturing and discover how to optimize your formulation for improved performance.
PVC profiles and pipes are common products in everyday life. UPVC pipes, profiles, and sheets are not manufactured from a single raw material but from various raw materials in different ratios. Therefore, every company has its unique and optimized recipe. As a UPVC manufacturer, understanding the composition of these raw materials, their ratios, and the plasticization principles is crucial. Furthermore, you need to adapt them to your production conditions. With years of experience as a UPVC profile screw barrel manufacturer, we’ve compiled this article to help you. If you have questions or need our screw barrels for UPVC profiles, please contact us.
UPVC Profile Raw Material Formulation Composition
1. PVC Resin
Extruded UPVC rigid products are typically made with suspension-process resins. Ensure the resin has the appropriate polymerization, particle size, and looseness. Avoid using resins with large particle sizes and tightly packed particles.
2. Stabilizers
PVC resin is heat-sensitive and begins to degrade at temperatures between 90-130°C, shedding unstable HCL, and turning yellow. Adding stabilizers to PVC resin helps prevent degradation by absorbing and neutralizing HCL gas. Common stabilizers include lead salts, organotins, metal soaps, and rare earth stabilizers.
3. Lubricants
Lubricants improve lubricity by decreasing interface adhesion. There are three types: external, internal, and internal/external. External lubricants decrease friction between the material and the metal surface, while internal lubricants lower the viscosity of the melt. The right lubricant can significantly reduce screw load, shear heat, and increase extrusion output.
4. Filling Materials
Fillers like CaCO3 increase hardness, rigidity, and reduce deformation and raw material costs in UPVC products.
5. Processing Modifier (ACR)
Processing modifiers accelerate PVC resin plasticization, improve material flow, heat deformation, gloss, and other product characteristics.
6. Impact Modifier
Common impact modifiers for UPVC include CPE (chlorinated polyethylene) and propylene glycol.
7. Colouring Agents
Common coloring agents include titanium dioxide and carbon black.
Effects of Plasticization on Counter-Rotating Twin Screw Extruders
1. PVC Resin
Different PVC resins have varying polymerization, powder structures, and bonding strengths between micro-particles. Resins with thinner surface layers and looser particles are easier to melt and produce better quality products.
2. Stabilizers
Stabilizers affect material deformation and melting in extrusion. The type and amount of stabilizer should be determined by the extruder and die used. Conical twin screw barrels, counter-rotating parallel twin screw barrels, and single screw barrels require different stabilizer dosages due to their structural differences and shear strengths.
3. Lubricants
Lubricants influence the melting time, speed, screw load, extrusion output, head pressure, and mechanical properties of the material. Internal lubricants reduce melt viscosity, while external lubricants decrease the shearing effect, prolonging melting time. The right balance is crucial for effective plasticization.
4. Fillers
Fillers like calcium carbonate and talc can play auxiliary stabilizing and external lubricating roles. The surface activity of fillers affects the lubricity and stability of the material during melting.
5. Modifiers
ACR and CPE impact modifiers increase the material’s melting and torque, affecting yield and plasticization time. The correct dosage is crucial for optimal extrusion performance.
About HUACHEN Screw
Since 1993, HUACHEN Screw has been a leading UPVC screw barrel manufacturer in Zhoushan Jintang. As experts in designing and processing twin screw barrels and high-speed extruder screw barrels, we offer a wide range of services, including design, modification, and customized screw barrels. We have successfully exported and supplied screw barrels to customers worldwide.
For more information on how HUACHEN Screw can help you optimize your UPVC profile formulations and improve your extrusion processes, visit our website.
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By understanding the principles of UPVC profile formulation and making the necessary adjustments, you can significantly enhance the performance and quality of your products. For expert advice and high-quality screw barrels, HUACHEN Screw is your trusted partner. Contact us today to discuss your specific needs.
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