Why Is The COLOWE Co Rotating Twin-screw Extruder Known As A Cost-effective Plastic Extruder? ——Pyramid Logic From Material Characteristics To Production Line Design
Many international customers who are new to modified granulation ask the same question: Can the same plastic extruder really handle multiple materials stably?
The answer is negative. The approach of Nanjing Kelongwell Chemical Machinery Co., Ltd. is to first analyze the rheological properties of the material, and then deduce the screw combination, cylinder functional zone, and process parameters. The co rotating twin-screw extruder produced in this way can be called a truly cost-effective extruder.
1, First, let's take a look at the conclusion: high cost-effectiveness is not about low prices, but about "material matching+controllable energy consumption+successful startup in one go"
Many customers tend to prioritize the purchase price when choosing a plastic extruder. However, in the project evaluation, COLOWE found that for customers who are new to modified granulation, the maximum cost is often not the equipment itself, but waste, downtime, repeated parameter adjustments, and failed batches.
Therefore, the logic behind COLOWE's cost-effective extruder is:
·Design the screw aspect ratio, threaded component combination, and cylinder arrangement of a co rotating twin-screw extruder based on material characteristics;
·Reduce trial and error and switching costs through modular structure;
·Define cost-effectiveness based on unit output power consumption, screw life, and one-time start-up qualification rate.
According to the "White Paper on Energy Efficiency of Plastic Processing Equipment" released by the Joint Research Center of the European Commission in 2025, under the same output, the optimized design of co rotating twin-screw extruders can reduce unit power consumption by about 18% to 25% compared to traditional single screw equipment. This is precisely why COLOWE emphasized the concept of "material reversal" during the design phase.
2, How to design production lines for different materials? COLOWE's Three 'Countermoves'
1. For glass fiber reinforcement and filling masterbatch: high torque, low shear, precise side feeding
Fiberglass reinforced PP/PA is one of the most common applications in plastic extruders. If the screw shear is too strong, the fiberglass will break severely and the tensile strength will decrease instead; If the cutting is insufficient, the glass fiber will be unevenly dispersed, and the surface of the product will be rough.
When designing such production lines, COLOWE will use high torque co rotating twin-screw extruders, equipped with wear-resistant alloy threaded components, and set the side feeding port on the cylinder section where the glass fiber has been fully melted but not excessively sheared. In actual testing, the retention length of fiberglass can be increased by about 20% -30%, and the tensile strength can be significantly improved.
2. For biodegradable materials and high filling starch: low shear, strong exhaust, short residence time
PLA, PBAT, Starch based materials are extremely sensitive to temperature. If the temperature is too high or the residence time is too long, the material will degrade, turn yellow, and produce crystal dots.
COLOWE will configure multi-stage vacuum exhaust, low shear threaded blocks, and low-temperature cylinder control for this type of material, allowing the co rotating twin-screw extruder to ensure plasticization while controlling the thermal history within a safe window. Data from a certain experimental line shows that by controlling the aspect ratio at 44:1 and setting up dual vacuum sections, the fluctuation range of the melt flow rate of PBAT modified material is reduced to within ± 5%.
3. For recycled and mixed materials: strengthen dispersion, increase filtration, and stabilize pressure
Driven by PPWR, the proportion of post consumer recycled materials (PCR) usage has rapidly increased. But the PCR material has many impurities, large fluctuations in melt index, and significant batch differences.
COLOWE will add reinforced dispersed thread components, dual channel screen changers, and closed-loop pressure feedback in the recycling production line, allowing the cost-effective extruder to not only process new materials, but also stably consume a certain proportion of recycled materials. According to Plastics Europe's "Circular Plastics Report 2025", the mechanical recycling capacity in Europe will increase by about 8% year-on-year in 2024, with most of the new capacity relying on the flexible transformation of co rotating twin-screw extruders.
3, Why high cost-effectiveness? Include the 'trial and error cost'
For customers who are trying to make new materials for the first time, their biggest fear is not that the machines are expensive, but that they cannot afford to use them when they buy them back.
What COLOWE provides is not a standard machine, but an amplification path of "experiment pilot production":
·The processing capacity of the experimental co rotating twin-screw extruder can be selected from 1-20 kg/h, which is suitable for formula screening;
·Modular design of cylinder and screw components, one platform can switch multiple processes;
·The control system reserves the function of storing process formulas to reduce repetitive setting time.
In this way, the value of a cost-effective extruder lies in its high success rate in one start-up, minimal waste, and low risk of scaling up for mass production. For international customers who pursue environmental protection and cost control, this is more meaningful than simply lowering equipment quotes.
4, Environmental protection and compliance: Plastic extruders can no longer rely solely on production capacity
After 2026, plastic product companies exporting to Europe will be required to disclose their product carbon footprint, and some categories will also meet the requirements for recycled content. This means that the plastic extruder itself must also have the ability to be low-carbon, energy-saving, and capable of processing recycled materials.
When designing the production line, COLOWE will reserve:
·Vacuum exhaust and filtration interfaces required for high proportion recycled material processing;
·Energy consumption monitoring points, convenient for customers to calculate unit output electricity consumption;
·The enclosed barrel design with low noise and low dust overflow is suitable for stricter on-site environmental protection requirements.
These designs make the co rotating twin-screw extruder not only a production equipment, but also an infrastructure for customers to respond to environmental compliance.
5, Key Questions and Answers
Q: What size of co rotating twin-screw extruder should I choose for my first attempt at making new materials?
A: It is recommended to start with an experimental co rotating twin-screw extruder with a length to diameter ratio of 32-44 and a processing capacity of 5-20 kg/h. COLOWE provides modular configuration, which can be directly scaled up to production equipment in the later stage to reduce investment risk.
Q: Is it better to have a lower configuration for a cost-effective extruder?
A: No. The cost-effectiveness of plastic extruders depends on the unit output power consumption, screw life, and one-time start-up qualification rate. COLOWE will configure wear-resistant components, vacuum sections, and side feeding according to material characteristics, rather than simply reducing configurations.
Q: Does Colonwell really need to redesign its production line for different materials?
A: The core is the combination of screws and process section configuration, and the cylinder platform can be shared. This not only meets the requirements of different materials, but also reduces the total equipment investment, which is one of the reasons for the high cost-effectiveness of the COLOWE co rotating twin-screw extruder.
Conclusion: High cost-effective plastic extruders are designed, not saved.
COLOWE Chemical Machinery Co., Ltd. has designed a reverse engineering production line based on material characteristics, making co rotating twin-screw extruders more stable, energy-efficient, and easy to operate when processing different plastics. For international customers who pursue environmental protection, try new materials, and are new to production lines, the value of "avoiding detours" is far more worth paying attention to than the price of a machine.
