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Single Screw Extruder

Material of single screw barrel  38CrMoAl polished and nitrided
Suitable material  PE, PP, ABS, PC, PP, PET, PPR, TPE..
Capacity  2-2000kg/h available
Quantity of screw barrel  One-piece screw and one barrel
Length and diameter ratio  10:1- 40:1 according to your material
Motor brand Siemens or a Chinese brand for choose
Gearbox  Guomao brand or Chang brand
Rotating speed of single screw  100rpm or 180rpm

WeCoEx has been produced Single Screw Extruder more than 20 years in China

single screw extruding machine

25mm single screw extruder can be used as a lab extruder in 3d filament extrusion line, it is also used as a co-extruder in PVC window profile extrusion for rubber strip, and it also can be used to make line strip in PVC pipe extrusion line, HDPE pipe extrusion line, and PPR pipe extrusion machine.

Main data: 

  • L/D: 25:1
  • Capacity: 1-3kg/h
  • motor power: 1.5 or 2.2KW
single screw extruding machine

35mm single screw extruder can be used as 3d printer filament extruder, and it is also used as the co-extruder in PVC window profile extrusion line, Plastic pipe extrusion line, WPC profile extrusion line.

Main data: 

  • L/D: 25:1
  • Capacity:4-6kg/h
  • motor power: 3KW
single screw extrusion machine

45mm single screw extruder can as a co-extrusion machine in WPC profile extrusion line, Roof tile extrusion line, and plastic pipe extrusion line, and it also can be used to make small plastic pipes, like PP, PPR, PVC pipes.

Main data: 

  • L/D: 25:1-33:1
  • Capacity: 25-66kg/h
  • motor power: 11, 15, 18.5 or 22KW
single screw extruding machine

65mm single screw extruder can be used in soft PVC pipe extrusion line, PPR pipe extrusion line, corrugated pipe extrusion line, PE pipe extrusion line, PP pipe extrusion line, PE/PP profile extrusion line.

Main data: 

  • L/D: 25:1-38:1
  • Capacity: 50-250kg/h
  • motor power: 22-75KW
single screw machine

75mm single screw extruder can be used to make soft PVC pipes, HDPE corrugated pipes, HDPE solid pipes, HDPE hollow wall pipes, PPR pipes, we have normal and high speed 75mm single screw extruder.

Main data: 

  • L/D: 25:1-38:1
  • Capacity: 60-500kg/h
  • motor power: 30-160KW

90mm single screw extruder can make PVC single wall and double wall corrugated pipes, HDPE corrugated pipes, HDPE solid pipes, HDPE hollow wall spiral pipes, PVC edge band.

Main data: 

  • L/D: 25:1-38:1
  • Capacity: 100-1000kg/h
  • motor power: 45-250KW

120mm single screw extruder used in plastic sheet extrusion line, plastic board extrusion line and plastic pipe extrusion line, plastic pelletizing line.

Main data: 

  • L/D: 10:1-38:1
  • Capacity: 200-1500kg/h
  • motor power: 37-355KW

120mm single screw extruder used in plastic sheet extrusion line, plastic board extrusion line and plastic pipe extrusion line, plastic pelletizing line.

Main data: 

  • L/D: 10:1-38:1
  • Capacity: 200-1500kg/h
  • motor power: 37-355KW

Your Premier Single Screw Extruder Manufacturer - WeCoEx Machinery

A single screw extruder is also named a single screw extruder machine; it cannot be used to make plastic products individually.  Single screw plastic extruder needs to be worked with a plastic die or plastic mold.

Single screw extruder can be used for PE pipe extrusion line, PPR pipe production line, PVC garden pipe machine, TPE profile extrusion line, and plastic recycling machine.

Single screw extruder is different from the twin-screw extruder, which means has one screw and barrel on the machine, and the L/D of a single screw plastic extruder has 10:1 to 50:1; we can help you to choose the right L/D for a single screw extruder according to your plastic material and requirements.

Our single screw extruder has a higher output than others with the same power consumption. As we use a high torque gearbox and a better screw on the single screw extruder, we also have our owing design on the barrel, especially in plastic recycling equipment.

As a professional single screw extruder manufacturer, we can supply our extruder to meet your plastic extrusion line; we also can supply the whole solution for your new plant, like plastic pipeline, plastic pelletizing line, and others.

The main parts of a single screw extruder are the gearbox, screw barrel, motor, and electrical device; when you choose the right single screw extruder supplier, please check these parts carefully. You can also check with our engineer for free.

You also can ask our engineer to send the diagram or drawing of a single screw extruder for your reference; after you choose the right single screw extruder, we will be very glad to receive more details from you.


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FAQ: Single Screw Extruder

 Introductory questions

1. What is the definition of a single screw extruder?

The single screw extruder is a piece of equipment whose sole function is to heat and melt raw materials, which commonly include polymer pellets, and propel them along its heated barrel before pushing/extruding the molten polymer through a die for shaping into various plastic products. It’s one of the main critical components of a plastic manufacturing line.

2. What is the processing procedure for a single screw extruder?

Single screw extruders are often complex machines made of many parts, including both mechanical and electrical components. Different companies specialized in making different components, and some may be based overseas.

Single screw extruder manufacturers often need to source for the most high-quality components for the finished single-screw extruders. Parts are usually interchangeable, in order to make the machines serviceable.

The manufacturing process often involves creating the frame that holds the components together, through various processes including, laser cutting, bending, welding, and spray painting. All the components are assembled into a functioning machine. Complete single-screw extruders undergo various tests to ensure optimum operation.

3. What is the difference between single screw and twin screw extruder?

The difference between the single-screw extruder and twin screw extruder lies in the number of screws in the barrel,  which is 1 for a single screw and 2 for a twin screw.  This of course comes with other differences in terms of performance, operation, capability, and application, for instance:

  1. Mixing performance: The intermeshing action created by two counter-rotating screws means better mixing performance than a single screw in a barrel.
  2. Expense:Generally expect to pay more for a twin-screw extruder than for a single-screw extruder.  Operational expenses are also going to be higher.
  3. Flexibility:  Twin screw extruders tend to have more specialized applications because they can perform more functions, including transporting, shearing, devolatilization, compression, mixing, cooking, heating, cooling, and pumping. For instance, they are used in recycling, or in reactive extrusion.
  4. Output: When manufacturingproducts such as large plastic sheets or pipes, manufacturers use twin-screw extruders with higher outputs.
  5. Operational:More attention to process parameters is required when working with a twin-screw extruder than the single-screw extruder that is much easier to operate.
  6. Flexibility:  A wide range of configurations are possible for a twin-screw extruder to suit process parameters compared to a single screw. Twin screws may be intermeshing, non-intermeshing, or parallel. They can be high-speed, or low speed, late fusion.
  7. Plasticizing performance:Twin single-screw extruders have better plasticizing performance than single-screw extruders because they have better uniform mixing, reduced friction,  uniform shearing, and the material remains in the barrel for longer.
  8. Raw materials:  Most twin-screw extruders are powder-fed while many single-screw extruders rely on pre-pelletized/pellet blends.
  9. Popularity:  Most industries tend to utilizesingle-screw extruders rather than twin-screw extruders that tend to be used in PVC manufacturing or compounding.

4. What are the advantages and disadvantages of a single screw extruder?

There are certain benefits to using a single-screw extruder in your processing line:

  • Simple and easy operation – Monitoring and controlling the various control parameters for a single screw extruder is much easier such as the screw speed, feed rate, and temperatures along the various process sections.
  • Cheaper to operate–  With the uncomplicated design of the single screw extruder and straightforward design,  it’s much cheaper to purchase and operate.
  • Pressure build-up capacity–  As a result of the screw operation and melting,  single-screw extruders are good at building up pressure, which increases operational capacity and speed.
  • Versatility– Single-screw extruders are highly versatile and can handle a wide range of applications.
  • Low noise– With a robust heavy-duty gearbox, a single screw extruder may have low noise operation.

Some of the disadvantages of the single-screw extruder include:

  • Single screw extruders don’t process powder-fed raw materials particularly well, and they tend to be cheaper in the long run than using pre-pelletized materials.
  • Single-screw extruders are prone to instability in the melt pressures. It affects the flow rate, resulting in surging, which reduces production rates and may lead to higher scrap rates.
  • They have less mixing capacity compared to twin-screw
  • Feed performance is at times affected since the melt material is conveyed down the barrel through friction.
  • The exhaust performance for the single-screw extruder tends to be poor.
  • They are not as flexible when it comes to a wide range of applications compared to twin-screw

5. Is the single screw extruder used for PVC pipe manufacturing?

The most common type of extruder for PVC pipe manufacturing is the conical twin-screw extruder. However, some single extruders can handle PVC materials, for instance, the BKE45 Single Screw Extruder.

6. What is the single screw extruder design?

Single-screw extruder designs vary depending on their capacity, use, and operation (normal speed vs. high speed). Small capacity single-screw extruders are used in co-extrusion applications or lab testing, for instance, the BKE25, or BKE35. Changing the barrel diameter allows for a larger single-screw extruder that can handle higher outputs such as the BKE65 with a 33:1 L/D ratio, and a maximum output of 150 kg/h.

The screw diameter often has an impact on the output, and some of the larger screw extruder models, include the BKE90 with a diameter of 90mm or the BKE120 with a maximum output of up to 1000 kg/h.  When working with the manufacturer,  their engineer should recommend the best L/D ratio, output capacity, and gearbox design that are sufficient for your manufacturing needs.

7. What is the working principle of a single screw extruder?

The main process steps when working with a single-screw extruder include:

  • Feeding of raw materials through the hopper – Materials are gravity fed.
  • Melting of the raw material –  It results from the high temperatures inside their single screw barrel. The turning screw promotes uniform mixing and conveys the melt material through other temperature zones.
  • Extrusion of melt material–  The molten mixture is extruded from the barrel into the die for shaping
  • Calibration – The extrudate is calibrated to the required dimensions before cooling.
  • Cooling and solidifying of the melt–  As the extrudate leaves the die,  it must be cooled down to retain its shape. There are different ways to cool the hot extrudate including using air cooling or immersion into cold water.
  • Structure, design, and working principle

8.  What is the single screw extruder diagram?

Source: Single Screw Extruder – an overview | ScienceDirect

9.  How many parts of a single screw extruder?

Parts of the  single-screw extruder include:

  • Hopper
  • Feed Throat
  • Barrel (segmented into the feed section, compression section, and metering section)
  • Motor
  • Gear Box
  • Transmission
  • Heaters
  • Fans
  • Vacuum pump

Electrical components:

  • Inverter
  • Air switch
  • Relay
  • Built-in Transformer
  • Power source
  • Temperature controllers

10.   What length and diameter of the screw barrel of a single screw extruder should be used?

The most important aspect when it comes to increasing the output of a single screw extruder is in fact its diameter and clearance between the screw and barrel. Single screw extruders have different diameters, and this affects their output. Consider this table when choosing the right diameter:

Product Screw & Barrel Output
BKE25 Φ25 3kg/h
BKE30 Φ30 3kg/h
BKE35 Φ35 20kg/h
BKE45 Φ45 70kg/h
BKE60 Φ60 400kg/h
BKE65 Φ65 150kg/h
BKE75 Φ75 200-600kg/h
BKE90 Φ90 400-1000kg/h
BKE120 Φ120 1100-1400kg/h

The length of the extruder is also important as it promotes uniform mixing, heating, and melting. When it comes to measuring the length, it’s measured from the outermost edge of the hopper to the front of the screw. Regardless of the diameter, most single-screw extruders have  L/D ratios of 33:1 or 38:1.

11.  What is the meaning of ratio on single screw extruder

The length to diameter ratio pegs the barrel’s diameter to the screw length. In the past, most extruders had a ratio of 20:1. Newer extruders have longer screw lengths that promote improved mixing and stable output.

12.  What is the function of the temperature zone and how many temperature zones are in the single screw extruder?

Single-screw extruders tend to have three zones, namely feeding compact and metering zones. Each zone has its own heating & cooling elements, and temperature controllers that line the barrel.

13. What is the vented single screw extruder?

The vented extruder has an exhaustion vent along its barrel that’s used to remove volatile gases and moisture from the plastic melt during the heating and extrusion process. The location of the vent is typically in the decompression zone, where the decompressed melt releases volatile compounds.

14.  What are the single screw extruder applications?

Single-screw extruders are ubiquitous across plastic manufacturing industries due to their manufacturing applications. Some of their uses include:

  • Production of PE pipes utilizedin the supply of domestic and irrigation water.
  • Manufacturing of PPR pipes used in industrialpiping systems, sanitary water pipelines,  hot water conveying, etc.
  • Strand making as part of a plastic pipe extrusion line
  • Co-extrusion applications for plastic profiles
  • Recycling applications
  • Manufacturing of HDPE pipes
  • Production of PP hollow sheets and construction boards
  • Pelletizing

15.  Which industries can the single screw extruder be used?

Single screw extruders are typically used in several industries, including injection molded plastics, extruded plastics, and the food industry.

16.  What is a single screw extruder for food processing?

Single-screw extruders play an important role in the food industry. They are used in the production of breakfast cereals, snacks, supplements,  meat and cheese analogs (substitutes), and more.

In making confectionery products, for instance, the main raw materials include sugar, glucose, and starch. They are heated in the extruder and excess moisture vented. Different shapes can be achieved by changing the die.

Flavors, chocolate, and colors are also utilized to produce a wide range of products, including creams, fudges, boiled sweets, and chocolate sweets.

Pet foods and animal feeds are also dependent on single screw extrusion. Manufactures also use them to reuse by-products by processing them into new products.

17.  Do you have a labor scale for the single screw extruder?

With the relatively uncomplicated nature of the single screw extruder, only one operator may be required to man the single screw extruder. More people may be required for other steps involved in the plastic extrusion line such as hauling off finished products, preparation, and feeding of raw materials in the hopper.

Skills the operator requires include:

  • The ability to perform quality checks and minimizemanufacturing defects;
  • Troubleshooting and maintenance of the single-screw extruder;
  • Ensuring that all the safety standards and procedures have been followed;
  • Performing startup and shutdowns;

18.  What is the vented single screw extruder used for?

Its main application is in the devolatilization of plastic resins that tend to have a higher moisture content since they are hygroscopic, meaning they have an increased affinity to attracting moisture.

19.  What is the pipe extrusion line with a single screw extruder?

When used in a pipe extrusion line, the single screw extruder works in conjunction with other machines to produce the finished pipe. Some of these machines include:

  • Vacuum calibration chamber – Located adjacent to the die,  its primary function is to hold the shape and dimensions of the extruded pipe.
  • Cooling tank –  It’s commonly used to cool down the pipe byimmersing it into a water bath following shaping.
  • Haul-off –  Typically consisting of two caterpillar tracks driven by a motor, the haul-off is responsible for drawing the extruded pipe from the die through the vacuumcalibration chamber and cooling tank. It also moves the pipe into the cutter.
  • Cutter – The cutter saws off sections of the pipe based on the length required by the customer. Different cutter designs are utilized. Though a bit expensive, it’s better to get the chip-free (no-scraps) cutter compared to the lift cutter.

Process questions

20.  How do I troubleshoot a single screw extruder?

The most important thing when troubleshooting a single-screw extruder is to take a methodical approach. There are many things that could go wrong, and here are the common challenges you may face:

a) Pressure buildup

You should check the manual for the recommended operating pressure under normal working conditions. Elevated precious baby corrected by turning down the speed control,  and if the pressure levels did not subside under low speed,  the operator should generally seek additional help from the lab.

b) Reduced output:

Extruders experience output problems where the expected output does not match the actual output. The reduced output may be as a result of the density of the constituents fed into the single-screw extruder.

You can also check if the screw speed is normal if not it should be increased. The next step is to check for barrel pressure. Operators should also check the screen pack for clogging or consider replacing it. The operator should also check the motor load and for low material levels in the hopper.

c)  Discoloration or bubbles in the extrudate

Operators may also detect problems with the appearance of the extrudate, including the presence of specks, air gaps, over glossiness, or discoloration. Some appearance issues tend to stem from contamination of the resin or degradation of the plastic melt in the extruder.

Discoloration, for instance, indicates that the polymer has been subjected to elevated temperatures for an extended period, which may be corrected by lowering the melting point and viscosity.

d)  Defects in the final product

Several problems may manifest in the final product, for instance cracking of plastic products under low stress. The problem may be as a result of the presence of a chemical that reduces the stress resistance of plastic.

Straining may also be reduced by making modifications to the extrusion process to enhance the relaxation of plastic particles after extrusion. For instance, cooling plastics less rapidly or reducing the extrusion rate.

21.  How to operate and control a single screw extruder?

With the advancements in the design of single-screw extruders by incorporating sensors and intelligent controllers, operating a single screw extruder has been made easier.

During start-up, the operator turns on the exhausts and the main switch. The motor stays off at this point. The operator sets the required temperature profiles. The next step is performing the heat-soak, which requires leaving the extruder on for up to 1 hour to prepare the extruder for extrusion.

After which they can make the run by filling the hopper with polymer pellets and turning the motor on. The operator will need to keep an eye on process parameters including pressure and temperature levels and measure the flow rate.

22. How do I test the quality of extrudate from a single screw extrusion machine?

Testing of the extrudate is done to ensure that it meets your standards for quality and consistency. There are a number of tests that can be carried out in the lab and by the operator.

Starting out, the operator may carry out an appearance test on the extrudate to ensure that it’s not discolored. They may check for unmelted pellets or the presence of air bubbles. Tensile testing may be carried out to confirm the physical strength of the extrudate.

Melt flow tests are also typically carried out on molten polymers. Thickness tests may ensure that products destined for consumers meet the specifications for dimensions and quality. Advanced tests such as rheology using a rheometer may be used to assess the rheological properties of molten polymers.

Purchase questions

23.  What is the HS code for a single screw extruder?

The HS code of a single screw extruder is 84772000. You can find out more about HS codes for single screw extruder spare parts and other accessories from

24.  Do you have a 2nd hand single screw extruder?

Purchasing a single screw extruder can translate to lots of cost-saving. If you’re looking for a second-hand single screw extruder,  you can contact the team at wecoex Machinery Co., Ltd. We also sell a wide range of new single-screw extruders.

25.  What is the price of a single screw extruder?

The price of a single screw extruder depends on its capacity. For a small lab plastic extruder,  you may spend about $1500 to $6000. For production single screw extruders, costs range from $10,000 to $80,000. To get an accurate quote for the price of a single screw extruder, contact us today.

26.  Which countries have manufacturers that produce single screw extruders?

Most manufacturers for single-screw extruders are concentrated in China, India, the US, and Taiwan. China has the unique advantage and manufacturing capability to produce high-quality extruders at a reasonable price for the international market.

27.  How to buy a high-quality single screw extruder?

The first step is to find a reliable manufacturer or supplier. It may involve searching for the company on the search engine or on trade websites. The next step is to contact the company and make an inquiry.

At wecoex Machinery, we listen attentively to your needs and recommend the most suitable extruder for your industry. The company may have the machine in stock or they may need to produce it for you. When working with Chinese manufacturers,  you will need to pay an initial deposit before production starts, and the rest after the machine is ready, fully tested and operational. It will then be packed for shipping.

28.  Where can I find a single screw extruder for sale?

Right here. We sell a wide range of single-screw extruders depending on the production output required, resin type, and production line. Alternatively,  you may try to find other manufacturers on the web. The most important thing is to find a company that puts quality and transparency first. Working with a company with lots of experience is recommended.

General questions

29. Where can I find single screw extruder training?

For general extrusion training, there are online training classes from websites such as Routsis Training, Polymers Center, Paulson Training Programs, and more.

Many manufacturers also provide training materials for their extruders. At wecoex Machinery, for instance, our engineers travel to client locations to install the machine when it arrives. Our engineers will offer additional training to the staff.

Thanks for reading this FAQ guide.

It’s kind of hard to know all about the single screw extruder in one go, but hopefully, you found a solution to your questions.

Next, we recommend getting in touch with us if you have more questions about the single screw extruder and how to order one.

Send us an email at or submit an online inquiry.

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