High torque melting PP mixing twin screw extruder

This equipment is a melt PP mixing extruder designed specifically for high-performance modification of polypropylene (PP). Nanjing Kelongwell Chemical Machinery Co., Ltd. relies on its profound technical accumulation to provide a full process solution for the modified plastics industry, from precise melting, efficient mixing to stable melting and granulation. Compared to ordinary PP extruders, this equipment focuses more on the mixing effect of high filling and high reinforcement PP systems. Through optimized twin screw extruder structure, it ensures excellent dispersion and homogeneity of materials in the molten state, and is widely used in fields such as automobiles, home appliances, and packaging.

·Optimization of screw combination: Adopting a co rotating twin screw extruder design with high free volume ratio screw components, specifically designed to address the high viscosity and low bulk density characteristics of PP melt, achieving stable conveying and efficient mixing.
·Precise temperature control system: The segmented barrel is equipped with electric heating and efficient water cooling, and each heating zone is independently controlled to meet the strict temperature control requirements of the melt PP mixing extruder for heat sensitive materials.
·Balancing high shear and flexible conveying: Specially designed threaded components can activate fillers under high shear, while maintaining gentle conveying before melt granulation to avoid material degradation.
·Advanced melt granulation system: equipped with underwater or water ring granulation units, the particles are uniform, the dust is minimal, and the sphericity is high, meeting the strict requirements of high-end products for melt granulation quality.
·Intelligent control system: PLC fully automatic control, real-time monitoring of key parameters such as melt pressure, temperature, torque, etc., to ensure the repeatability and stability of the melt PP mixing process.

Noted: Details depend on your requirements and need.

Why choose a melt PP mixing extruder instead of a regular PP extruder?
·Better dispersion and mixing ability: Ordinary PP extruders mainly use melt conveying, while this twin screw extruder enhances the functions of distribution and dispersion mixing. When processing filling systems such as talc powder, glass fiber, flame retardants, etc., sub micron level uniform dispersion can be achieved, which is the key to preparing high-performance engineering plastics.
·Higher quality of melt granulation: In response to the strong elastic memory of PP material, we have optimized the melt granulation die and cutting system, effectively reducing "trailing materials" and debris. The particle regularity is high, providing a more stable raw material guarantee for downstream injection molding.
·Higher process integration: Compared to traditional PP extruders, this machine can be equipped with a side feeding system to add thermosensitive additives in the later stage, shortening its heating time; At the same time, it strengthens the devolatilization ability to ensure that there are no bubbles or oxidation in the particles after melting granulation, resulting in better appearance and mechanical properties of the product.

·Automotive industry: Melt PP mixing of lightweight materials such as long glass fiber reinforced PP (LFT) and talc filled PP, used for structural components and interior parts.
·Packaging industry: High fluidity thin-walled injection molded PP material, relying on stable melt granulation process to ensure consistent melt index.
·Electronic appliances: halogen-free flame-retardant PP composite material, utilizing the excellent exhaust capacity of twin screw extruders to prevent the decomposition of flame retardants.
·Renewable resources: high-value recycling of post consumer or industrial waste PP, achieving near raw material performance through fine filtration and melt granulation.

Nanjing Kelongwell Chemical Machinery Co., Ltd. provides comprehensive OEM/ODM customization services. Our engineering team can tailor the most suitable twin screw extruder solution for you, whether it is for special aspect ratios required for reactive extrusion, wear-resistant liners suitable for high mineral filling, or melt granulation dies customized according to material characteristics (underwater cutting/water ring cutting/strip cutting). From process validation to full line delivery, we provide full support to ensure that your melt PP mixing extruder accurately matches production needs.

Q1: What are the core differences between your melt PP mixing extruder and a regular PP extruder?
A: Ordinary PP extruders are mostly single screw structures, mainly used for melt plasticization and simple extrusion; Our melt PP mixing twin screw extruder is designed specifically for formula mixing. It integrates high-strength mixing, precise temperature control, multi-point exhaust, and an adapted melt granulation system. For example, when processing PP reinforcement materials with glass fiber content as high as 60%~80%, ordinary PP extruders are difficult to achieve uniform distribution of fibers. However, this equipment can ensure fiber length retention and dispersion through side feeding and special screw combination, and the final melt granulation quality is much better than ordinary equipment.

Q2: Can this twin screw extruder handle high filling PP formulas? For example, filling over 70% with calcium carbonate or talc powder?
A: Absolutely possible. Our twin screw extruder has been specifically optimized for high filling systems. By using wear-resistant alloy liners, lateral forced feeding, and specific screw arrangements, it is ensured that high proportion powders can stably enter the melt and be fully wetted. During the entire process of melting PP mixing, the polymer effectively envelops the filler, resulting in uniform and powder free particles obtained through melting granulation, meeting the downstream processing requirements of high filling materials.

Q3: How to ensure that thermosensitive additives do not decompose during the melt granulation process?
A: Our equipment adopts a segmented barrel design and is equipped with multiple independent temperature controls and a rear feeding port. For thermosensitive additives (such as certain flame retardants, foaming agents, or color powders), they can be added from the side feeding port after the material has completed basic melting in the twin screw extruder, significantly reducing their residence time in the high-temperature zone. At the same time, the melt granulation die area adopts a rapid cooling design to ensure that the additive activity is maximally retained in the final particles.

Q4: What types of melt granulation systems are available for selection? What PP materials are suitable for each?
A: We offer three mainstream melt granulation matching solutions:
·Underwater Particle Cutting: Suitable for high-yield, non adhesive PP composite materials, with high particle roundness and good cooling efficiency.
·Water ring granulation: easy to operate, suitable for formulas with medium yield and high requirements for particle appearance.
·Strip cutting: suitable for systems that require visual observation of material appearance or contain a high proportion of fiberglass.
All systems are synchronously controlled with the molten PP mixing extruder to ensure consistent cutting length and particle size height.

Q5: Can Nanjing Kelongwell provide process support for the new formula?
A: Of course. As a professional manufacturer of twin screw extruders, we have a process laboratory equipped with small melt PP mixing extruders and matching melt granulation units. You can send the new formula or raw materials to our company, and we will explore the process on the experimental line, optimize the screw combination, temperature control curve, and cutting parameters, form a mature process package, and then scale it up to the production equipment to minimize your process development risks.