Parallel Twin Screw Extruder

+25% Output Efficlency

-15% Energy Consumption

99.6% Stable Operation Rate

Why our pipe extruder stands out

Due to professional and advanced design, our parallel twin screw extruder provides superb mixing and plasticizing effect, with stable material distribution and high conveying efficiency.
Midtech’s parallel twin screw extruders with different diameters and L/D ratios can meet the requirement of various PVC extrusion products.
Our extruders’ advanced real-time control systems precisely manage every process parameter—temperature, screw speed, pressure—ensuring uniform wall thickness, consistent dimensions, and material reliability
Engineered for rugged industrial use with high-grade materials and heavy-duty components, our extruders feature robust construction and advanced engineering to minimize wear. This delivers fewer breakdowns, reduced maintenance.

Midtech developed Parallel twin screw extruder design,we offer an optimal solution specifically for PVC processing.Looking at the striking advantages.The specially designed screw concept enables every gentle and homogenous plasticizing.

Parameter

Model	SJP75/28	SJP92/31	SJP110/31	SJP120/31	SJP135/31
Motor power(KW )	45	75	110	132	160
Screw diameter(mm)	75	92	110	120	135
L/D	28:1	31:1	31:1	31:1	31:1
Max output(kg/h)	350	460	680	850	1100

Core Advantages

Extruder

Unique screw design to achieve higher plasticizing and products quality.

Gearbox of high torsion balance to realize stable running,low oil temperature available.

PLC (Simatic Multi Panel) operation panel to ensure synchronization.

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

YOUR PARTNER IN PLASTIC PROCESSING

Midtech transforms plastics into possibilitles.

ConticLus today tarlormereebuut our torpliele pluasli processing solutions.

FAQ

Why is a parallel twin screw extruder preferred over a single screw extruder for PVC pipe?

Parallel twin screw extruder offer better mixing, uniform melting, and lower shear heating, which is critical for heat-sensitive PVC. They prevent material degradat

How do I prevent PVC degradation and black specks during extrusion?

Maintain precise temperature control (zoned heating along the barrel), avoid excessive screw speeds, and ensure proper venting to remove moisture and decomposition gases. Also, use corrosion-resistant screw/barrel materials (e.g., nitrided steel or bimetallic lining) since PVC releases HCl.

Does the screw rotation direction matter? Co-rotating vs. counter-rotating for PVC pipe?

Most PVC pipe lines use counter-rotating parallel twin screw extruder because they provide positive conveying, lower shear, and better pressure stability for thick-walled pipes. Co-rotating types are less common for pipe but may be used for special profiles or highly filled compounds.

What are the key maintenance requirements for a parallel twin screw extruder in PVC pipe production?

Regular checks of screw and barrel wear (especially in the compression zone), cleaning of vent ports, inspection of heating/cooling zones, and lubrication of gearboxes. PVC compounds with calcium carbonate can be abrasive, so screw segments may need replacement every 6–12 months under heavy use.

What downstream equipment is needed after the parallel twin screw extruder for PVC pipe?

A complete line includes: extruder → pipe die head → sizing sleeve → vacuum calibration tank → spray cooling tank → haul-off unit → pipe cutter → belling machine (for socketed pipes). Close integration with the extruder’s screw speed and pressure sensors is essential for uniform pipe dimensions.