Extruder technology innovation

Chinese conventional extruders and production lines are gradually becoming popular in the international market due to their excellent cost performance. At the same time, China continues to innovate in the field of advanced extrusion technology and has developed a variety of new extrusion products. Precision extrusion technology meets the needs of high-precision processing
Melt gear pump
Precision extrusion molding can eliminate the need for subsequent processing methods, better meet the needs of product applications, and at the same time achieve the purpose of reducing material costs and improving product quality. Nowadays, to meet the needs of precise direct extrusion of plastic products, a variety of mature technologies have been introduced to the market, and the polymer melt gear pump is one of the important means. This technology has been widely used in chemical fiber, film, profiles, pipes, plates, cables, composite extrusion, granulation and other production lines.
After years of systematic research on melt gear pumps, the Rubber and Plastic Machinery Research Institute of Beijing University of Chemical Technology has successfully completed a series of development and research of plastic melt gear pumps. It is now able to design and manufacture plastic melt gear pump products such as 28/28 (center Pitch/tooth width), 56/56, 70/70, 90/90, etc., the maximum inlet and outlet pressure difference can reach 30MPa, which can meet the requirements of different outputs and has been applied in practice with good results. The Rubber and Plastic Machinery Research Institute of Beijing University of Chemical Technology conducted in-depth research on integrated gear pump extruders and designed and developed the 115 integrated gear pump extruder.
Gear pumps are also of great benefit to precision molding in the rubber industry. In order to meet the domestic demand for rubber melt gear pumps, Beijing University of Chemical Technology also cooperated with Beijing Aviation Manufacturing Engineering Research Institute and Hangzhou Chaoyang Rubber Co., Ltd. to jointly develop two models of rubber melt gear pumps, XCP150/100 and XCP120/90. Exit the unit. This unit has ideal working characteristics, ensuring a linear relationship between the extrusion volume and the speed of the gear pump, enabling precise control of output and improving the dimensional accuracy of the product.
Mature development of multi-layer co-extrusion technology
Multi-layer composite technology uses materials with medium and high barrier properties to be combined with other packaging materials. It combines the high barrier properties of barrier materials with the cheap or special mechanical, thermal and other properties of other materials to achieve specific functional needs. The structural design of co-extruded composite films gradually requires the ability to systematically achieve the ideal state of integrating function, technology, cost, environmental protection, safety, and secondary processing, so that the possibility of maximizing the number of composite layers has become a technology pursued by suppliers. one. The seven-layer composite film co-extrusion blow molding technology of Guangdong Jinming Plastic Equipment Co., Ltd. can be described as a typical example of China's development in this field.
The key technologies used in this seven-layer composite film co-extrusion blow molding unit include: a screw plasticizing extrusion system with two short and one long screws and variable pitch, the optimized design of the vibration-induced plasticizing device using engineering analysis software, and a flat valve addition die head And inclined valve addition type die, internal cooling technology and double air outlet negative pressure cooling technology, multi-component loss-in-weight metering feeding, online film thickness precise control system, computer centralized automatic control system and bus control (CANOPEN) technology, etc. [2]
As the number of layers increases, film production technology adapted to special functions is also one of the hot spots in market development. Guangdong Shicheng Company designed and manufactured a PP environmentally friendly wood grain film casting production line with a width of 3150mm. The production line's production capacity exceeds 800kg/h. The screw is designed for high-speed shearing, mixing, and high-efficiency plasticizing screw. Customers can directly use highly filled calcium carbonate powder and inorganic pigment toner, thus saving expensive raw material costs. In addition to the production of PP environmentally friendly wood grain film, the entire line can also be flexibly converted to produce other products to broaden customer product categories. During the trial production process of Shicheng Company, it not only produced beautiful PP wood grain films, but also produced CPP films, PP stationery films and PP stationery sheets.