With the continuous expansion of the application field and technological progress, the market still maintains a certain upward momentum, but the price of domestic betting machines has fallen sharply. The crude manufacture and vicious price war of some manufacturers have affected the overall image and market competitiveness of domestic plastic machinery, and also hindered the development of plastic processing industry. Experts believe that the future market of mainframe and production line will develop in the direction of high technology content and low price. From the point of view of molding equipment, the domestic main engine is basically conical double screw betting machine and single screw transfer machine, the technology is mature, the market sales are large. However, the general specification of this product has exceeded the demand. Can only be maintained at the peak of the market 50% ≤ 60%. In the future, the domestic main engine market should focus on the development of parallel and reverse double screw pullout machine to meet the needs of mass extrusion. Parallel co-directional twin-screw puller should be developed to the sixth and seventh generations of high speed and large aspect ratio. The single screw pullout machine is developing in the direction of super-large, ultra-micro, large aspect ratio, high output and high exhaust volume. Screw tube structure to meet the needs of special machining has become the focus of research and development. In fact, the single screw puller is a kind of low energy consumption and low cost type, as long as the process is reasonable and the structure design is reasonable, it can also achieve the effect of double screw pullout machine. Rate It is reported that the plastic puller used in the United States is mainly a single screw. The single screw puller with high technical content gradually replaces the twin screw puller in some fields. Recently, with the development of the market, different manufacturers at home and abroad have introduced a variety of special single screw betting machines to meet the special needs of the market. The following is a special introduction to the research and development of several special ejectors in China. The diameter of the screw is only 12 mm, the weight of the whole machine is less than 2.5 kg, and the working speed of the screw is 800 × 1200 rpm, which can realize continuous or intermittent work. In addition On the other hand, because of the large wall slip and easy bridge, the processed materials are equipped with a specially designed forced feeding device, and a special multi-channel exhaust device is designed for the portable operation of the ejector, which fully ensures the discharge quantity of the ejector. Gas. In addition, this machine also has the characteristics of deep slot, large pitch, electric, pneumatic driving mode, cleaning, maintenance and so on. This machine was originally designed and processed as a special low density and low viscosity material, which can be used for extrusion processing of all kinds of low viscosity materials, such as hot melt adhesive, low molecular weight resin, all kinds of paraffin wax, fuel, pigment, cosmetics and so on. In the design and processing of general equipment, micro extrusion There are many unimaginable difficulties in research and development. According to reports, the key to the development of the equipment lies in the solution of feed, exhaust and low temperature extruder transportation problems. Many domestic manufacturers have completed the development of disc ejector and realized the commercial production of disc ejector. It is difficult to process high filling material by ordinary single screw or twin screw extruder. When the glass fiber is reinforced by twin-screw extruder, it is difficult to process if the content of glass fiber is more than 45%. In the processing of magnetic materials, the content of magnetic powder is usually as high as 60% ≤ 70%, sometimes even more than 90%. You know. It is almost impossible to process and granulate magnetic materials with ordinary extruders.