Extruder is one of the plastic machinery. The development trend of extruder is as follows:
(1) Extruders are developing toward large-scale, high-speed, and high-efficiency. Extruders with screw diameters of 200-250 mm abroad are very common. Special extruders with screw diameters greater than 400 mm are not uncommon. Increasing the screw diameter can increase the production capacity of the extruder. When the screw diameter is doubled, the production capacity of the extruder can be increased several times.
Another effective way to increase production capacity is to increase the speed of the screw. There are high-speed and ultra-high-speed extruders with a speed above 300r/min abroad, which greatly improves the production capacity of the extruder. However, the increased speed will cause problems such as poor plasticization, which has prompted people to study and test the extrusion theory and the structure of the screw, and many new screws have emerged, such as separation type, mixing type, barrier type, and split type. , Combined type, etc. The length-to-diameter ratio of the screw has also developed from 20:1 to 36:1, and some are as high as 43:1. This is very effective for improving the quality and efficiency of plasticization.
(2) The auxiliary equipment of the extruder has also been perfected, and the standard is standardized to meet the requirements of different plastic products.
(3) Extrusion automation, using microcomputer to detect and control the extruder process parameters, the temperature difference can be controlled within ± 1 ℃. Extrusion equipment uses microelectronics technology to make plastic extrusion molding process develop towards accuracy, precision, energy saving and automation.
(4) In order to adapt to the requirements of new materials and new processes, new or special extruders are constantly appearing. Such as three-screw extruder and planetary multi-screw, screwless extruder, reactive extruder, two-color extruder, foaming extruder, etc.
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