Conical Twin Screw Extruder

+25% Output Efficlency

-15% Energy Consumption

99.6% Stable Operation Rate

Why our pipe extruder stands out

Advanced Conical Screw & Barrel Geometry Progressive High-Pressure Compression. Nitrided Bimetallic Wear Protection.
Intelligent Thermal Management System Core Oil Circulation & Multi-Zone Air Cooling. Ceramic Heating Elements.
Ultra-Heavy-Duty Driving Transmission Vertical/Horizontal High-Torque Gearbox. AC Variable Frequency and Permanent Magnet Motors.

At the heart of every high-performance extrusion line sits the extruder. The MIDTECH Conical Twin-Screw Extruder is engineered specifically to meet the demanding thermal and physical requirements of PVC powder formulations. Unlike parallel extruders, the unique tapered geometry of conical screws—featuring a large diameter at the feeding zone and a small diameter at the discharge zone—provides an expansive surface area for gentle, uniform material intake and progressive mechanical shearing.

Parameter

Model	SJSZ 51-105	SJSZ 55-110	SJSZ 65-132	SJSZ 80-156	SJSZ 92-188
Driving motor	18.5W	22KW	37KW	55KW	110KW
Rotation speed	1-45	11-4-	1-35	1-37	1-33
Capacity	80-150	150-180	350-300	320-400	600-800
Weigth	3200	3500	4000	5000	8000

Core Advantages

Extruder

Special screw design suitable for high output with lower melt temperature.

Robust high torque gearbox, unique design for high capacity extruder.

Automatic control system between extruder speed, feeder and haul off.

Preheating unit, Gravimetric unit, Running remote control make precision working system.

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FAQ

Why should I choose a Conical twin-screw extruder over a Parallel twin-screw extruder for PVC?

Conical twin-screw extruders are the global benchmark for PVC powder extrusion. Because PVC powder has high bulk density but poor thermal conductivity, the tapering screws provide a massive feeding volume and a long material path that ensures gentle, natural melting without overheating. Furthermore, conical designs are far more structurally robust at absorbing the extreme back-pressure generated by intricate profile dies and high-calcium filler formulations, offering exceptional value and lower maintenance costs over time.

Can I use the same Conical extruder to produce both pipes and window profiles?

Yes, absolutely. The extruder itself acts as a universal polymer melting and pumping station. To switch from PVC pipe production to window profiles, WPC decking, or ceiling panels, you only need to change the front die head/tooling, the downstream calibration/cooling table, and the caterpillar pads on the haul-off. The extruder’s PLC system allows you to save independent recipe profiles for each product for instant recall.

How does this extruder handle high-calcium carbonate filler formulations?

It handles them exceptionally well. High-filler formulations are a popular way for manufacturers to reduce raw material costs, but they increase friction and barrel wear. MIDTECH addresses this by treating our conical screws and barrels with bimetallic tungsten-carbide alloys. The progressive, low-shear mechanical mixing design blends high percentages of filler homogeneously into the PVC matrix without creating localized hotspots or tearing the polymer chains.

What is the function of the internal screw oil cooling system?

PVC is a highly heat-sensitive material with a narrow processing temperature window. During high-output extrusion, internal friction can cause the screws to overheat, leading to PVC sticking, yellowing, or burning inside the channels. Our built-in oil temperature controller continuously circulates oil through the center of the screws to pull away excess frictional heat, ensuring perfect melt thermal control.

Does MIDTECH offer automated auxiliary feeding equipment for this extruder?

Yes, we provide full turnkey feeding solutions. Depending on your material layout, we offer specialized spring-screw feeders, vacuum powder loaders, and highly accurate Gravimetric Dosing Systems that sync directly with the extruder’s PLC to automatically maintain exact material ratios and weight-per-meter output control.