Five Development Trends of Plastic Extruders
2017-03-13
HIGH-SPEED AND HIGH-YIELD . The high-speed and high-yield output of an extruder repay the investors with greater output and higher returns at lower input. However, the high speed rotation of extruder screw also brings a series of trouble to be overcome: for example, the reduction of staying duration in the screw will lead to uneven mixing and plasticization of materials. The excessive shearing may cause sudden heating, resulting in thermal decomposition of materials. The fluctuation of extrusion stability may cause the fluctuation of geometric shape of extruded products. Higher accuracy of related auxiliary devices and control systems is required. High and even ultra-high wear-resistant materials are required for the screw and cylinder. In addition, it’s a problem that how to extend service life of reducers and bearings in high-speed operation.
HIGH EFFICIENCY AND MULTI-FUNCTION. The efficiency of a Plastic Extruder is represented by its high output, low energy consumption and low manufacturing cost. In terms of function, the screw extruder can be used not only for extrusion and mixing of polymer materials, but also for foods, feeds, electrodes, explosives, building materials, packaging, pulp, ceramics and other fields. In addition, the "one-step extrusion process" which combines granulation mixing and extrusion forming processes is also worthy of attention.
LARGE-SCALE AND HIGH PRECISION. Larger extrusion equipment contributes to lower production cost, which is more obvious in large twin-screw granulators, film blowing extruders, pipe extruders and so on. Large extrusion granulators, one of the major technical equipment used in national key projects and one of the three key equipment for large-scale ethylene project, has long relied on being imported from overseas, highlighting the necessity of speedy production domesticization to cater for the development of petrochemical industry. HIGH PRECISION can delivery more value to the products. E.g. the production of multi-layer co-extrusion composite film requires high precision extruding. In depth research of the melt gear pump is required to achieve precise extrusion.
MODULAR AND SPECIALIZED PRODUCTION. Modular production ensures satisfying the special requirements of various users, shortening the research and development cycle of new products, contributing to larger market share; while specialized production means outsourcing or even global procurement of various system module components , which is very helpful to ensure the overall quality, reduce costs and accelerate financial turnover.
INTELLIGENT AND INTERNETED. Extruders in developed countries have generally employed modern electronic and computer control technology. The parameters of extrusion process such as melt pressure and temperature, machine temperature of various sections, rotational speed of main screw and feeding screw, feeding volume, ratio of various raw materials, current and voltage of motor are measured online, and controlled by a computer in a closed-loop. Some companies have adopted online remote monitoring, diagnosis and control of the extrusion production line. This is very helpful to ensure the stability of process conditions and improve the accuracy of products.
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