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The new twin-screw extruder, the ZEUTX series from Berstorff, Germany, differs in its performance in terms of its excellent screw diameter/productivity ratio. The screw design has a maximum speed of 1200 rpm, a large torque, and an extrusion capacity of between 100 and 3,500 kg/h. The process of mixing, reacting, and venting materials can be performed simultaneously. The barrel and screw adopt modular design, which can meet various special process requirements, and has excellent processing flexibility. It is also equipped with ZSEF type side feeder, which can achieve high solid particle conveying rate. The pelletizer can be used. Match different yields and material processing.
In order to meet the needs of high speed and high production, the extruder has many improvements. Equipped with a barrel heater, the temperature rise of the extruder can be completed in a very short time, the maximum heating temperature can reach 450 ° C; the cooling flow channel design truly achieves reverse flow cooling, optimizes the cooling system; Tightening device", the time to replace the barrel can be faster than the traditional bolted type; the barrel uses a patented induction hardening process, which gives excellent wear resistance, thus eliminating the need for expensive wear-resistant bushings; In addition, it is equipped with the company's advanced process control system.
Multifunctional
In terms of function, the twin-screw extruder is no longer limited to the molding and mixing of polymer materials, and its use has expanded to include food, feed, explosives, building materials, packaging, pulp and ceramics. In addition, the "one-step direct extrusion process" which combines the kneading granulation and the extrusion molding process into one is also very attractive.
WPC (Wood Composites) is used in outdoor applications, such as deck decking and fences, for a long time, especially in the United States. The Cincinnati company has developed the Fiberex series and continues to optimize it for WPC molding. The fourth-generation Fiberex, with an extended, wear-resistant processing unit, can fully meet the different requirements of customers and achieve high output. At last year's NPE show, Cincinnati demonstrated the entire Fiberex pilot line with a Fiberex T58 extrusion machine with a capacity of 200 kg/h (440 lb/h) for forming 75% of the molding process. Wood powder filled PP compound. The production line manufactures a profile for the furniture industry with a wall thickness of 2.5 mm and an extrusion setting speed of 2 m/min.
Large size and precision
Achieving large-scale extrusion molding equipment can reduce production costs, especially for large twin-screw granulators, blown film units, and pipe groups. In China, large-scale equipment has long relied on imports, and research on the localization of large-scale twin-screw granulators is underway. Precision can increase the gold content of the product, such as multi-layer composite co-extruded film. As an important means to achieve precision extrusion, the melt gear pump should be intensively developed and researched.
Internationally renowned suppliers have a large number of mature technologies in the development of large extruders.
In order to meet the needs of different customers, JSW offers twin-screw extruders with different specifications from TEX30 to TEX400. Its largest twin-screw extruder TEX400 has a diameter of 443mm, a total length of 35m and a total weight of 320 tons.
Yanbu National Oil Company recently ordered a large twin-screw ZSK320 extruder from W&P, including motors, granulators and water-cooling systems, with a total value of more than 20 million euros. Depending on the polymer type and viscosity, the output is 25-50 tons per hour.
Cincinnati Extrusion Co., Ltd., Vienna, Austria, was shipped to a US customer in 2006 to date one of the world's largest counter-rotating parallel twin-screw extruders. The 30t giant machine can produce up to 2000kg/h and is ideal for high-speed production of PVC sheets.
A lot of work has also been done on the research and development of the melt gear pump in the domestic research institute. Beijing University of Chemical Technology has developed a number of series of melt gear pump products.
Krauss-Maffei's 36D series twin-screw extruders are designed for PVC processing
Modular and specialized
Modular production can adapt to the special requirements of different users, shorten the development cycle of new products, and strive for a larger market share; and specialized production can arrange the various system module components of extrusion molding equipment to be fixed-point production or even global procurement. It is very beneficial to ensure the quality of the whole machine, reduce costs and accelerate capital turnover.
Manufacturers will significantly reduce the cost of PVC pipe raw materials by increasing the amount of filler. The engineering challenge is to ensure the stability of the process and the quality of the product. Krauss-Maffei's 36D series of parallel twin-screw extruders are designed for ideal PVC processing. They achieve a uniformity of high throughput and high mechanical properties. In addition, these extruders provide high quality tubing of consistent quality.
In processing high-fill formulations, a 36D twin-screw extruder developed by Krauss-Maffei is used to process PVC sewage pipes. It is also feasible to fill up to 65 parts (about 40%) of CaCO3. High-filled pipes with a diameter of 50~500mm are mainly used to transport sewage.
To make high-fill formulation easier to process, the extruder is equipped with special material feeding, weighing and metering systems. The PVC dry mix and CaCO3 are conveyed from the storage bin to the hopper of the weighing metering device by means of a screw feed screw. A mixer and a stirrer are installed in the hopper to prevent bridging. In addition, all metering surfaces that come into contact with the material have a special coating to prevent material flow from becoming blocked. From the metering device, the material is transferred to the feeder at the feed port of the extruder by means of a stirrer and a special twin screw feeder.
Intelligent and networked
In addition to the technical transformation of the equipment itself, advanced twin-screw extruders have generally adopted microcomputer control, process parameters such as melt pressure and temperature, body temperature, main screw and feed screw speed for the entire extrusion process. On-line monitoring and control of parameters such as the feeding amount, the ratio of various raw materials, and the current and voltage of the motor are extremely beneficial to ensure the stability of the process conditions and improve the accuracy of the product.
Twin screw market innovation technology trends
High speed, high efficiency and energy saving have always been the main theme of the continuous improvement of international plastic machinery in recent years. High speed and high output allow investors to get high returns with low investment. However, the high speed of the screw speed brings a series of extremely difficult problems to be solved: if the residence time of the material in the screw is short, it is easy to cause uneven mixing of the material and plasticization; excessive shear may cause sudden temperature rise and thermal decomposition of the material; Extrusion stability problems; need high-performance auxiliary machines and precision control systems to match; screw and barrel wear problems and design of reduction gearbox design. Therefore, providing solutions to the problems that may arise from high-speedization is one of the important directions for the technological innovation of twin-screw suppliers.