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Analysis on the Four Trends and Prospects of Plastic Extruder Development

2019-12-26 Hits:904
After more than 100 years of development, the plastic extruder has been derived from the original single screw, such as twin screw, multi-screw, and even no screw. The plastic extruder (main machine) can be used with various plastic molding auxiliary machines such as pipes, films, holding materials, monofilaments, flat filaments, packing belts, extrusion nets, plates (sheets), profiles, pellets, and cable coatings. Match and form various plastic extrusion molding production lines to produce various plastic products. Therefore, plastic extrusion molding machinery is one of the widely used machines in the plastic processing industry, now and in the future.
The development trends of plastic extruder are as follows:
(1) Extruders are developing in the direction of large size, high speed and high efficiency. Extruders with screw diameters of 200-250mm are very common in foreign countries, and special extruders with screw diameters greater than 400mm are not uncommon. Increasing the diameter of the screw can increase the production capacity of the extruder. When the diameter of the screw is doubled, the production capacity of the extruder can be increased several times. Another effective method to increase production capacity is to increase the rotation speed of the screw. High-speed and ultra-high-speed extruders with speeds above 300 r / min have appeared abroad, thereby greatly improving the production capacity of the extruder. However, problems such as poor plasticization will be brought about after the increase of the rotation speed, which urges people to study and test the extrusion theory and the structure of the screw. As a result, many new types of screws have appeared, such as separation type, superb type, and barrier. Type, shunt type, combination type, etc. The aspect ratio of the screw has also developed from 20: 1 to 36: 1, some as high as 43: 1. This is very effective for improving the plasticizing quality and efficiency.
Analysis on the Four Trends and Prospects of Plastic Extruder Development
(2) The auxiliary equipment of the extruder has also been perfected and standardized to meet the requirements of different plastic products.
(3) Extrusion automation, using microcomputer to detect and control the process parameters of the extruder, the temperature difference can be controlled within ± 1 ℃. The extrusion equipment adopts microelectronic technology to make the plastic extrusion molding process develop in the direction of accuracy, precision, energy saving and automation.
(4) In order to meet the requirements of new materials and new processes, new or dedicated extruders are constantly appearing. Such as three-screw extruder and planetary multi-screw, screw-free extruder, reactive extruder, two-color extruder, foaming extruder, etc.
Today, modern plastic extruder has generally adopted modern electronic and computer control technology to carry out on-line inspection of the entire extrusion process and adopts microcomputer closed-loop control. In order to meet the diversified needs of production development, plastic molding technology has developed vigorously in modern efficient large-scale production and intelligent control.
What is the industry outlook for plastic extruders?
As China's extruder products are closely linked with strategic new industries, they have the advantages of high efficiency, energy saving, and high cost performance. Exports to developed countries are mainly low-end. This part of the consumer demand is rigid. Therefore, the extruder The development of the industry still has a large market space.
From the domestic perspective, China is still in the stage of in-depth development of industrialization, informatization, urbanization, marketization, and internationalization, and is still in the period of important strategic opportunities for development, which will also provide an inexhaustible development momentum for the extruder industry. Finally, the recovery of the international market has brought confidence to extruder companies. Nowadays, the extruder industry in developed countries has generally adopted modern electronic and computer control technology. The process parameters of the entire extrusion process, such as melt pressure and temperature, body temperature of each section, main screw and feeding screw speed, feeding Parameters, such as the proportion of various raw materials, the current and voltage of the motor, are tested online, and closed-loop microcomputer control is used. Some companies have adopted online remote monitoring, diagnosis and control to carry out network control on extrusion molding production lines. This is extremely beneficial for ensuring the stability of process conditions and improving the accuracy of the product.
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