Twin Screw Extruder
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Twin Screw Extruder

Twin screw extrusion is used extensively for mixing, compounding, or reacting polymeric materials. The flexibility of twin screw extrusion equipment allows this operation to be designed specifically for the formulation being processed. For example, the two screws may be corotating or counterrotating, intermeshing, or non intermeshing. Besides, the configurations of the screws themselves may be varied using forward conveying elements, reverse conveying elements, kneading blocks, and other designs to achieve particular mixing characteristics.

 

Twin screw extruders are used for compounding when special colors or different properties need to be added to the plastic materials. This type of plastic extrusion machinery allows the mixing of different materials to create a certain color or property of the plastics.

 

Twin Screw Extruders Types

Co-Rotating Extruders

Co-Rotating machines indicated that the screws turn in the same direction. Often these intermeshing screws turn at higher RPMs then counter rotating machines. The material moves over one screw to the other and passes underneath. This flow provides consistent shear and dispersion. These machines are often used in compounding and mixing applications. The screw elements are modular and can be changed relatively easily to give a desired effect inside the barrel segments.

 

Co-Rotating twin screw extruders have a lot of customization ability due to their modular nature. Many of these machines seen in the market can have multiple venting ports, screw fed material feed sections, and liquid additive sections along the barrel. The customization continues upstream as well. Because the machines are starve fed most extruders will have extensive feed systems with gravimetric or volumetric blending systems upstream. 

 

Counter Rotating Extruders

Counter-Rotating twin screw extruders have two screws that spin in the opposite direction. Also often intermeshing this style of machine is usually found in the profile, PVC, or wood composite industry. 

 

These machines typically have a much lower screw RPM and generally have much smaller l/d ratios. The screw direction allows for less shear than a single or co rotating screw machine. 

 

The two styles of extrusion machines within the counter-rotating extruder category known as parallel twin screw extruder and conical twin screw extruder. A parallel twin screw has a consistent barrel diameter through the entire barrel. A conical twin screw extruder has a taper. The feed section is much larger than the end of the barrel. Both counter rotating machines often have barrel venting. The barrels and screws of these machines are not modular so they may need to be changed for your specific application.  Air cooling and water cooling are both common.

 

How Does Extrusion Work?

Extrusion processing aims to physicochemically transform continuously viscous polymeric media and produce high-quality structured products thanks to the accurate control of processing conditions.

 

Chuangbo twin-screw extruders consist of two intermeshings, co-rotating screws mounted on splined shafts in a closed barrel. Due to a wide range of screw and barrel designs, various screw profiles and process functions can be set up according to process requirements. Hence, a twin screw extruder can ensure transporting, compressing, mixing, shearing, heating, cooling, pumping, shaping, etc. With a high level of flexibility. The major advantage of intermeshing co-rotating twin-screw extruders is their remarkable mixing capability which confers exceptional characteristics to extruded products and adds significant value to processing units.

 

In twin screw extrusion processing, the raw materials may be solids (powders, granulates), liquids, and possibly gases. Extruded products are plastics compounds, chemically modified polymers, etc.

 

Twin Screw Extruder Parts

The function of the screw element is mainly used to convey materials. Feeding and degassing sections generally have the long pitch to improve the material conveying and degassing.

 

Chuangbo modular twin screw extruder barrels are available for different processing requirements: feed, liquid injection, side feeding, closed, vent.

 

Chuangbo screw shafts can withstand significant increases in load, torque, and temperature. The special choice of material and heat treatment coupled with careful machining produces a top-quality component.

 

Conical twin screw force feeder is specially designed to feed big block and dough material. All of our conical feed is processing requirements to prevent over-engineering or premature failure. 

 

The twin-screw side feeder used in the extruder can feed powdery or granular fillers, additives, or cut glass fiber side into the processing section of the twin-screw extruder.

 

To meet our customers' requirements, the flexible design of the Chuangbo liquid feeder allows the use of customized agitators, electrical or liquid tracing, and different pump configurations.

 

The loss-in-weight feeder consists of a hopper, a feeder (single and twin-shaft screw feeder), a weighing system, and a regulator. In operation, the hopper, material, and feeder are continuously weighed together.

 

Gearbox

These are designed specifically for Chuangbo twin-screw extruder specifications. They must achieve two co-rotating outputs, and be capable of handling high torque.

 

Advantages of Twin Screw Extrusion

Remarkable mixing capability, due to the interpenetration of the screws and the broad diversity of specialized screw designs (such as reverse screw elements, kneading blocks, gear mixing elements, etc.) which allow the extent of shearing/mixing to be precisely adjusted; hence leading to control the degree of mixing in regards to mixing intensity and mixing quality (dispersive versus distributive). Conversely, the mixing capability of single screw extruders is very limited, and any flow restrictions to enhance mixing through special screw designs lead to depressing the extruder throughput.
 
High level of process flexibility, due to throughput and screw speed independency, and capability to handle multiple processing functions in series (such as melting, mixing, venting, cooling, etc.) in one single extruder. Conversely, with single screw extruders throughput and screw speed are dependent, and screw designs with multiple processing functions in series are restricted.
 
Better control of process parameters, that is narrower residence time distribution, lower dispersion of shear rates and strain, higher convective heat transfer, accurate control of temperature profile; hence leading to much better control of shear-time-temperature histories in the extruder, to a much wider range of mechanical energy inputs, and so to more consistency in regards to material conversion and product quality.
 
Higher process productivity, due to positive pumping action of the screws, ability to handle wider varieties of raw materials, and mix formulations including complex recipes, screw speed-aided compensation of screw wear (with single screw extruders process performances invariably decrease when screw wear increases), lower downtime.
 
Higher economic opportunities and business potential than single screw extruders, owing to higher process flexibility and productivity, to produce a wider range of end products, to convert materials and handle product quality more consistently, to compensate the effect of screw wear through screw speed adjustment.

 

  •  
    Model Diameter
    (mm)
    L/D Screw speed
    (r/min)
    Power
    (kw)
    Torque
    (N.m)
    Specific torque
    (T/A3)
    Capacity
    (kg/h)
    TSB-18 18 32-60 400 1.5 17 5.1 0.5~6
          600 2.2 17 5 0.5~10
    TSB-25 26 32-60 500 5.5 50.4 4.7 3~15
          600 7.5 57.3 5.4 3~25
    TSB-35 35.6 32-68 500 15 138 5.1 10~55
          600 18.5 141 5.2 10~90
          900 30 159 5.8 20~120
    TSB-40 41 32-68 400 22 252 6.1 30~110
          600 30 229 5.6 50~150
          900 45 238 5.8 75~225
    TSB-52 51.4 32-68 500 45 413 5.2 80~225
          600 55 420 5.3 100~275
          900 75 398 5 150~375
    TSB-65 62.4 32-68 400 75 860 6.1 150~375
          500 90 825 5.9 180~450
          600 110 840 6 220~550
          900 160 848 6 350~825
    TSB-75 71 32-68 400 110 1261 5.8 220~550
          500 132 1210 5.6 275~660
          600 160 1222 5.7 330~800
          900 250 1325 6.1 500~1200
    TSB-85 81 32-68 400 160 1834 5.9 330~800
          500 200 1834 5.9 400~1000
          900 350 1856 6 700~1800
    TSB-95 93 32-68 400 250 2865 6 500~1250
          500 280 2567 5.4 600~1400
          900 500 2652 5.5 1100~2500
    TSB-115 115.5 32-68 500 500 4584 5.2 1100~2500
    TSB-135 133 32-68 400 650 7449 5.6 1500~3250
    TSB-150 152 32-68 400 1000 11937 6 2200~4820
    TSB-175 172.6 32-68 400 1500 17906 5.7 3300~7185
     
     
  •  
    Model Diameter
    (mm)
    L/D Screw speed
    (r/min)
    Power
    (kw)
    Torque
    (N.m)
    Specific torque
    (T/A3)
    Capacity
    (kg/h)
    TSH-25 26 32-60 400 7.5 86 8.1 3~25
    600 11 84 7.9 5~35
    900 15 80 7.9 7.5~82.5
    TSH-35 35.6 32-68 500 22 202 7.5 10~110
    600 30 229 8.5 10~150
    900 45 238 8.8 15~225
    TSH-40 41 32-68 500 37 339 8.3 110~200
    600 45 344 8.4 135~225
    900 55 292 7.1 190~335
    TSH-52 51.4 32-68 500 75 688 8.6 225~375
    600 90 688 8.6 270~450
    900 110 583 7.3 350~650
    TSH-65 62.4 32-68 500 132 1210 8.6 396~660
    600 160 1222 8.7 480~800
    900 250 1326 9.4 650~1200
    TSH-75 71 32-68 500 200 1834 8.5 600~1000
    600 250 1910 8.8 750~1250
    900 350 1856 8.5 950~1800
    TSH-85 81 32-68 500 280 2567 8.2 840~1400
    600 350 2674 8.6 1050~1750
    900 500 2652 8.5 1450~2600
    TSH-95 93 32-68 500 450 4126 8.7 1350~2250
    600 550 4202 8.9 1650~2750
    900 800 4240 8.9 2000~4000
    TSH-115 115.5 32-68 500 800 7334 8.3 2400~4000
    TSH-135 133 32-68 400 1000 11460 8.6 3000~5000
     
     
  •  
    Model Diameter
    (mm)
    L/D Screw speed
    (r/min)
    Power
    (kw)
    Torque
    (N.m)
    Specific torque
    (T/A3)
    Capacity
    (kg/h)
    TSS-35 35.6 32-68 500 30 286 10.6 10~150
    600 37 294 10.9 12~180
    900 55 291 10.8 18~270
    TSS-40 41 32-68 500 45 429 10.4 135~225
    600 55 437 10.6 160~270
    900 90 477 11.6 240~400
    TSS-52 51.4 32-68 500 90 825 10.4 270~450
    600 110 825 10.4 330~550
    900 160 848 10.6 480~810
    TSS-65 62.4 32-68 500 160 1467 10.4 480~800
    600 200 1528 10.9 600~1000
    900 280 1485 10.5 820~1450
    TSS-75 71 32-68 500 250 2292 10.6 750~1250
    600 315 2407 11.1 945~1575
    900 400 2387 11 900~2300
    TSS-95 93 32-68 500 550 5043 10.6 1650~2750
    600 650 4966 10.5 1950~3250
    900 1000 5305 11.1 2950~4800
    TSS-115 115.5 32-68 500 1000 9168 10.4 3300~5000
    TSS-135 133 32-68 500 1500 13752 9.8 4500~7500
     
     
  •  
    Model Diameter
    (mm)
    Do/Di L/D Screw speed
    (r/min)
    Power
    (kw)
    Torque
    (N.m)
    Specific torque
    (T/A3)
    Capacity
    (kg/h)
    TSV-44 44 1.8 32-68 500 30 280 6.8 90~150
    600 37 285 7 110~250
    800 45 260 6.5 135~225
    TSV-55 55 1.8 32-68 500 55 510 6.5 165~275
    600 75 575 7.3 225~375
    800 90 520 6.5 270~450
    TSV-66 66 1.8 32-68 500 110 1015 7.2 330~550
    600 132 1015 7.2 396~660
    800 160 920 6.6 480~800
    TSV-77 77 1.8 32-68 500 160 1475 7 480~800
    600 200 1535 7.1 600~1000
    800 250 1440 6.7 750~1250
    TSV-86 86 1.8 32-68 500 250 2300 7.4 750~1250
    600 315 2415 7.8 945~1575
    800 400 2300 7.4 1200~2000
    TSV-100 99 1.8 32-68 500 400 3680 7.8 1200~2000
    600 500 3835 8 1500~2000
    TSV-120 122 1.8 32-68 500 730 6692 7.5 2190~3650
    TSV-140 140 1.8 32-68 400 900 10314 7.7 2700~4500
     
  •  
    Type Diameter
    (mm)
    L/D Screw speed
    (r/min)
    Power
    (kw)
    Capacity
    (kg/h)
    TSC-52/120 TSB-52 51.4 24~48 500 45 100~300
    SE-120 120 7~20 85 30~37
    TSC-52/150 TSH-52 51.4 24~48 600 90 200~500
    SE-150 150 7~20 85 37~45
    TSC-65/150 TSB-65 62.4 24~48 500 75 200~500
    SE-150 150 7~20 85 37~45
    TSC-65/180 TSH-65 62.4 24~48 600 160 400~1000
    SE-180 180 7~20 85 45~55
    TSC-75/180 TSB-75 71 24~48 500 110 400~800
    SE-180 180 7~20 85 45~55
    TSC-75/200 TSH-75 71 24~48 600 250 700~1500
    SE-200 200 7~20 85 55~75
    TSC-95/200 TSB-95 93 24~48 400 200~250 700~1500
    SE-200 200 7~20 85 55~75
    TSC-95/220 TSB-95 93 24~48 400 200~250 800~1600
    SE-220 220 7~20 85 75~90
     
     

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