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Conical Screw Barrel is the core component of plastic extrusion equipment. It is specially designed for high-viscosity, high-filling and complex-formulation polymer processing. It is widely used in precision extrusion molding in the fields of PVC wood plastic, PE/PP pipes, high-calcium profiles, foamed boards, etc. Its unique conical twin-screw structure achieves efficient mixing and shearing through counter-rotation. Combined with the optimized compression ratio design, it ensures uniform plasticization and sufficient exhaust of materials, significantly improving production efficiency and product quality.
Core performance and highlights
High strength and wear resistance: Made of high-quality alloy steel 38CrMoAlA (SACM645), it is nitrided (nitriding hardness HV900-1100, nitriding layer 0.5-0.8mm) or bimetallic spraying process (alloy layer hardness HRC58-65, thickness 1.5-2mm), which greatly improves the surface wear resistance and corrosion resistance, and is suitable for glass fiber reinforced materials and highly corrosive plastic processing.
Precision machining technology: straightness is controlled within 0.015mm, surface roughness ≤Ra0.4, chrome plating thickness 0.025-0.1mm, ensuring material flow stability and extrusion accuracy, reducing energy consumption and scrap rate.
Customized design: supports multiple specifications and models (such as Φ51/105, Φ65/132, Φ92/188, etc.), flexibly adjusts the screw structure and compression ratio according to the characteristics of the raw materials (such as viscosity, filling ratio), and adapts to the diversified production needs of PVC foaming, high calcium pipes, wood-plastic composite materials, etc.
Process and material advantages
Heat treatment technology: optimize the toughness of the substrate through quenching and tempering treatment (tempering hardness HB280-300), combined with nitriding or bimetallic process to form a high hardness surface layer, balance wear resistance and impact resistance, and extend service life.
Multifunctional adaptability: The tapered design of the conical twin screw enhances the material compression efficiency, and cooperates with the exhaust groove and segmented barrel structure to effectively remove volatile gases and avoid overflow problems. It is especially suitable for processing heat-sensitive materials (such as PVC).
Application areas
Engineering plastics: Suitable for blending, modification and granulation of high-performance materials such as ABS, PA, PC, etc.
Environmentally friendly materials: Used for efficient extrusion molding of wood-plastic composite materials and recycled plastics.
Special products: Such as high-calcium pipes, foamed boards, ultra-high molecular weight polyethylene sheets, etc.
Conical Screw Barrel has become a key component for improving production capacity and quality in the plastic extrusion industry with its innovative structural design, excellent wear resistance and flexible customization capabilities. Whether it is a high-filling formula or complex process requirements, it can provide stable and reliable solutions to help companies achieve efficient, low-consumption and sustainable production.
