Development trend of plastic granulation extruder
Posted: Tuesday April 21
after more than 100 years of development, the plastic granulation extruder has derived from the original single screw into multiple models such as twin screw, multiple screw, and even no screw. plastic granulation extruder (host) can be formed with various plastics such as pipes, films, holding materials, monofilaments, flat yarns, packing tape, extruded nets, plates (sheets), profiled materials, granulation, cable coating, etc. the auxiliary machine is matched to form various plastic extrusion molding production lines to produce various plastic products. therefore, plastic extrusion molding machinery is one of the widely used models in the plastic processing industry no matter now or in the future.
the development trend of plastic granulation extruder is as follows:
(1) extruders are developing towards large-scale, high-speed and high-efficiency. plastic pelletizing 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 method to increase the production capacity is to increase the rotation speed of the screw. there are high-speed and ultra-high-speed extruders with a rotation speed of more than 300r / min abroad, which greatly improves the production capacity of the extruder. however, the increased speed will bring about problems such as poor plasticization, which has prompted people to study and test the extrusion theory and the structure of the screw, resulting in the emergence of many new screws, such as separation type, mixing type, barrier type, and split type. , combined type, etc. the length-diameter ratio of the screw has also been 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 process parameters of the extruder, the temperature difference can be controlled within ± 1 ℃. extrusion equipment adopts 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.
nowadays, modern plastic pelletizing extruders have generally adopted modern electronic and computer control technology to conduct online inspection of the entire extrusion process and adopt microcomputer closed-loop control. in order to meet the diversified needs of production development, plastic molding technology has been vigorously developing towards modern high-efficiency large-scale production and intelligent control.
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