Through different cylinder and screw combinations, the co rotating twin-screw extruder can meet the mixing demand of almost all kinds of plastics in the market, and it has become the most rapidly developing and widely used mixing technology in the market.
At the same time, in order to meet the processing demand of higher filling volume, domestic and foreign suppliers have developed various kinds of disc extruders, reciprocating screw extruders and different combinations of multi screw extruders. In recent years, multi screw extruder has gradually become a force of rapid development in the mixing market to meet the direct processing demand of sensitive materials.
Multi screw new technology emerges in endlessly
In recent years, different manufacturers and research institutes have developed new models such as inverted triangle arrangement three screw extruder, one word arrangement three screw extruder, one word arrangement four screw extruder, Mrs multi screw extruder, and the combination of multi screw extruder and single screw or twin screw extruder The direct machining system plays a special role in different fields.
Beijing University of chemical technology has independently developed a fully engaged three screw extruder with inverted triangle arrangement. According to the introduction, the newly developed three screw extruder has the advantages of low energy consumption, high output, good mixing and dispersion quality. It can obtain the dispersion effect better than the conventional twin screw extruder with a small aspect ratio, and has excellent exhaust performance. There is no overflow at the exhaust port, which can effectively reduce the loss of raw materials and energy in the production process. In this project, the error correction technology of end face combination is proposed and used for the first time to realize the smooth transition in the process of combination of different screw elements and ensure the interchangeability of screw elements.
Based on the national key scientific and technological research project and "863" project undertaken by the National Engineering Research Center of polymer new molding equipment of South China University of technology, TDM series parallel three screw dynamic mixing extruder is developed. The three screws of the extruder mesh in a "one" shape and rotate in the same direction at high speed. Under the action of the vibration force field, the axial meshing clearance between the main screw and the two auxiliary screws changes periodically, which makes the materials subject to strong shearing, extrusion, kneading and grinding, so as to make the materials better homogenized and dispersed. Compared with the traditional parallel twin-screw dynamic mixing extruder, it has one more high shear zone, which can achieve high output extrusion, and the production capacity is close to 2 times of that of the twin-screw extruder with the same screw diameter. Due to the increase of specific surface area and the increase of surface renewal rate, the devolatilization efficiency is also greatly improved. This series of machine adopts the same direction parallel combination three screw structure and introduces the vibration force field into melting, plasticizing, mixing and mixing. It has unique advantages of high filling, high dispersion, high output and low energy consumption.
The latest developed multi screw mixing system Mrs extruder was introduced by gneuss in k2007 and Chinaplas in 2008. Mrs system consists of a single screw drum. According to different specifications, there are 8-10 screw grooves on the screw drum. In these grooves are respectively equipped with conveying screws which are parallel to the axis of the extruder. These small screws are driven by a set of planetary gear system and rotate reversely with the main screw. Using this system to achieve significant exchange effect. These small grooves are opened on the screw drum, and 30% of them are open type, which can optimize the melt entry and easy to discharge. In addition, due to the fact that all parts contacting the melt can be controlled separately, the extremely accurate melt temperature control can be realized.
The Mrs extruder includes a single screw drum for significant exchange
According to the introduction, the unique system components and structure of Mrs make its possible devolatilization area far higher than that of the commonly used extrusion system. For example, the free surface of the melt produced by the Mrs system in vacuum can be 25 times more than that of the co rotating twin screw extruder.
Compared with the traditional multi screw extruder, Mrs system has many obvious differences. In Mrs system, each screw has its own bearing support. This means that 8-10 small screws are parallel to each other. The ring extruder is usually composed of several two engaged screws, while the planetary screw is in the form of several screws engaged with the barrel and the main screw respectively. Both of these technologies are limited open areas and are very sensitive to impurities in materials. And these impurities are often inevitable in the processing of recycled materials.
Technovel, a Japanese extruder manufacturer, exhibited a fully meshed contract rotating four screw extruder on k2007. The device is arranged in one word. The kzwfr series four screw extruder developed by technovel (patent pending) is mainly used for traditional processing methods, such as the processing of materials that can not be processed by single screw or even twin screw, according to the field personnel of technovel. According to the introduction, the equipment can reduce the heat generation of materials in the processing process, extend the residence time of materials, improve the exhaust function, improve the feed performance, and has better dispersion performance, which can realize stable precision extrusion, and save energy and space.
Pet directly processed into a hot spot.
Through different cylinder and screw combinations, the co rotating twin-screw extruder can meet the mixing demand of almost all kinds of plastics in the market, and it has become the most rapidly developing and widely used mixing technology in the market.
At the same time, in order to meet the processing demand of higher filling volume, domestic and foreign suppliers have developed various kinds of disc extruders, reciprocating screw extruders and different combinations of multi screw extruders. In recent years, multi screw extruder has gradually become a force of rapid development in the mixing market to meet the direct processing demand of sensitive materials.
Multi screw new technology emerges in endlessly
In recent years, different manufacturers and research institutes have developed new models such as inverted triangle arrangement three screw extruder, one word arrangement three screw extruder, one word arrangement four screw extruder, Mrs multi screw extruder, and the combination of multi screw extruder and single screw or twin screw extruder The direct machining system plays a special role in different fields.
Beijing University of chemical technology has independently developed a fully engaged three screw extruder with inverted triangle arrangement. According to the introduction, the newly developed three screw extruder has the advantages of low energy consumption, high output, good mixing and dispersion quality. It can obtain the dispersion effect better than the conventional twin screw extruder with a small aspect ratio, and has excellent exhaust performance. There is no overflow at the exhaust port, which can effectively reduce the loss of raw materials and energy in the production process. In this project, the error correction technology of end face combination is proposed and used for the first time to realize the smooth transition in the process of combination of different screw elements and ensure the interchangeability of screw elements.
Based on the national key scientific and technological research project and "863" project undertaken by the National Engineering Research Center of polymer new molding equipment of South China University of technology, TDM series parallel three screw dynamic mixing extruder is developed. The three screws of the extruder mesh in a "one" shape and rotate in the same direction at high speed. Under the action of the vibration force field, the axial meshing clearance between the main screw and the two auxiliary screws changes periodically, which makes the materials subject to strong shearing, extrusion, kneading and grinding, so as to make the materials better homogenized and dispersed. Compared with the traditional parallel twin-screw dynamic mixing extruder, it has one more high shear zone, which can achieve high output extrusion, and the production capacity is close to 2 times of that of the twin-screw extruder with the same screw diameter. Due to the increase of specific surface area and the increase of surface renewal rate, the devolatilization efficiency is also greatly improved. This series of machine adopts the same direction parallel combination three screw structure and introduces the vibration force field into melting, plasticizing, mixing and mixing. It has unique advantages of high filling, high dispersion, high output and low energy consumption.
The latest developed multi screw mixing system Mrs extruder was introduced by gneuss in k2007 and Chinaplas in 2008. Mrs system consists of a single screw drum. According to different specifications, there are 8-10 screw grooves on the screw drum. In these grooves are respectively equipped with conveying screws which are parallel to the axis of the extruder. These small screws are driven by a set of planetary gear system and rotate reversely with the main screw. Using this system to achieve significant exchange effect. These small grooves are opened on the screw drum, and 30% of them are open type, which can optimize the melt entry and easy to discharge. In addition, due to the fact that all parts contacting the melt can be controlled separately, the extremely accurate melt temperature control can be realized.
The Mrs extruder includes a single screw drum for significant exchange
According to the introduction, the unique system components and structure of Mrs make its possible devolatilization area far higher than that of the commonly used extrusion system. For example, the free surface of the melt produced by the Mrs system in vacuum can be 25 times more than that of the co rotating twin screw extruder.
Compared with the traditional multi screw extruder, Mrs system has many obvious differences. In Mrs system, each screw has its own bearing support. This means that 8-10 small screws are parallel to each other. The ring extruder is usually composed of several two engaged screws, while the planetary screw is in the form of several screws engaged with the barrel and the main screw respectively. Both of these technologies are limited open areas and are very sensitive to impurities in materials. And these impurities are often inevitable in the processing of recycled materials.
Technovel, a Japanese extruder manufacturer, exhibited a fully meshed contract rotating four screw extruder on k2007. The device is arranged in one word. The kzwfr series four screw extruder developed by technovel (patent pending) is mainly used for traditional processing methods, such as the processing of materials that can not be processed by single screw or even twin screw, according to the field personnel of technovel. According to the introduction, the equipment can reduce the heat generation of materials in the processing process, extend the residence time of materials, improve the exhaust function, improve the feed performance, and has better dispersion performance, which can realize stable precision extrusion, and save energy and space.
Pet directly processed into a hot spot
