The plastics industry's most widely used extruders encompass single-screw, parallel twin-screw, and conical twin-screw models, each featuring unique structural designs and specialized application scenarios. As a professional manufacturer of plastic extrusion equipment, Yongte provides tailored extrusion solutions based on clients' specific material properties and product performance requirements.

I. Core Differences Among The Three Type of Extruders

· Single-screw extruder: Cost-effective, simple in design, and highly versatile—ideal for extruding pure materials and manufacturing finished products.

· Parallel twin-screw extruder: Exhibits excellent mixing performance and is suitable for modification, granulation, filling, and blending.

· Conical twin-screw extruder: Designed for high-torque, low-speed, high-pressure operation—specifically optimized for extruding rigid PVC (e.g., plastic-steel doors and windows, drainage pipes).

II. Detailed Comparison (Refer to this for model selection)

1. Single-screw Extruder

Structure: A screw rod rotates within the material cylinder. Key Advantages:

· Simple structure, cost-effective, and highly durable

· Stable discharge performance, ideal for producing finished products. Limitations:

· Limited mixing capability and inability to handle high-volume filler materials. Suitable Materials: PE, PP, ABS, PS, soft PVC, EVA, and recycled plastics for straightforward extrusion processes. Typical Products: Pipes, films, cables, profiles, and standard granules. Unsuitable Applications: High-filler compounding, intensive mixing processes, reactive extrusion, and rigid PVC production.

2. Parallel twin-screw extruder

Structure: Two screws of identical diameter are arranged in parallel and interlocked. Strength advantage:

· Demonstrates the strongest mixing, shearing, and dispersing capabilities

· Suitable for high filler content, glass fiber, masterbatch, and reactive extrusion applications. Weakness:

· High price

· Not suitable for rigid PVC (excessive shear force may cause decomposition). Suitable materials: PP/PE/ABS/PA/PC modified compounds, color masterbatches, filler masterbatches, biodegradable plastics, and recycled modified materials. Typical applications: plastic pelletizing, modification, blending, filling, and glass fiber reinforcement. Incompatible with rigid PVC products (e.g., doors/windows, pipe fittings).

3. Conical Double Screw Extruder

Structure: Two screws arranged in a conical pattern from thick to thin. Strength advantage:

· High torque, high pressure, and moderate shear force

· Specifically engineered for rigid PVC, it maintains structural integrity without compromising performance.

· Primarily suitable for PVC applications due to limited versatility. Recommended materials: rigid PVC, PVC powder, calcium powder, and high-filling PVC. Typical products: PVC window and door profiles, PVC drainage pipes, PVC cable trays, and panel cladding. Unsuitable for: PE/PP granulation, modification, or film production.

III. Extruder Performance Comparison Table