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Development history of twin screw extruder and six advantages

Date:2020-01-11

Twin-screw extruder Twin-screw technology is an important extrusion technology development in the past 50 years. The technology was only commercialized in the 1950s, a date that is nearly 20 years shorter than its initial appearance. Italian and German engineers successfully developed twin-screw extruders, including co-rotation and counter-rotation. The initial purpose was to improve the production efficiency of PVC pipes. Roberto Colombo, founder of LMP (Lavorazione Materie Plastiche), tried mixing cellulose acetate with a twin screw to avoid the use of solvents. In 1938, he envisioned the use of an intermeshing, co-rotating twin-screw extruder for PVC pelletization for pipe extrusion. Prior to this, the preparation of PVC pipes has been completed using press equipment.
Since then, co-rotating twin-screw extruders have dominated PVC-U extrusion. Twin screws can achieve high yields at low shear rates, thus reducing the amount of expensive stabilizers. Twin-screw extruders are also used for compounding and pelletizing resins. It plays an important role in compounding fillers and fibers. Also used in reaction processing such as polymerization, grafting, modification and other fields.
Twin screw extruder advantages
1.Intuitively understand the wear of wearing parts
Because it is easy to open, you can find the wear of the threaded components and barrel liners at any time, so that effective maintenance or replacement can be performed. Not to be found when there is a problem with the extruded product, causing unnecessary waste.
2. Reduce production costs
When manufacturing master batches, it is often necessary to change the color. If it is necessary to change the product, open the open processing area within a few minutes. In addition, the mixing process can be analyzed by observing the melt profile on the entire screw. At present, when a common twin-screw extruder is changing colors, a large amount of cleaning materials are needed for cleaning, which is time-consuming, power-consuming, and wastes raw materials. The split-type twin-screw extruder can solve this problem. When changing colors, the barrel can be quickly opened for manual cleaning in just a few minutes, so that no or less cleaning materials are used, which saves costs.
3. Improve labor efficiency
During equipment maintenance, ordinary twin-screw extruders often have to remove the heating and cooling system first, and then pull out the screw as a whole. The split twin screw is not needed, just loosen a few bolts, turn the worm gear box handle device to lift the upper part of the barrel to open the entire barrel, and then perform maintenance. This shortens the maintenance time and reduces the labor intensity.
4.High torque and high speed
At present, the development trend of twin-screw extruders in the world is toward high torque, high speed, and low energy consumption. The effect of high speed is high productivity. Split twin-screw extruder belongs to this category, and its speed can reach 500 rpm. Therefore, it has unique advantages in processing high-viscosity and heat-sensitive materials.
5. Wide application range of twin screw extruder
Wide range of applications, suitable for processing of multiple materials
6.High output, high quality, rate
It has other advantages of ordinary twin-screw extruder, which can realize high output, high quality and rate.

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