Extruders are generally classified into single screw extruders, twin screw extruders, and multi-screw extruders according to the number of screws.
The screw extruder consists of a plasticizing system, a heating and cooling system, a transmission system and an electrical control system. The main component of the plasticizing system is the screw, which is selected according to the variety of plastics and their products. Commonly used extruders have a screw diameter of 30 to 250 mm and a rotational speed of 30 to 300 r/min. The length of the screw is usually 20 to 25 times the diameter and 30 times the maximum. The extruder barrel is heated by an electric heater and cooled with water or air. The conveyors used in screw extruder extruders are mostly commutator motors or DC motors.
China's extruder industry has prospered with the development of the plastics processing machinery industry, and has been able to meet the basic needs of the domestic market, and maintain a good momentum in exports on the premise of continuously improving product performance and quality. Since the first half of this year, extruder products have fluctuated in terms of exports, and the overall export value of the industry has declined slightly.
Judging from the monthly export value, except for March, the monthly export value fluctuated between US$0.2-0.3 billion, with the highest export value in January and May reaching US$30 million, and it fell to March. US$17 million, entering 2013, the overcapacity crisis was the most serious at the beginning of the year, and manufacturers have taken price cuts to maintain profitability, resulting in a sharp decline in the export value of extruders in March; as the impact of the financial crisis on the world economy has gradually weakened, international The market situation has warmed up, and various production companies have adopted measures to reduce production capacity and stabilize prices. The demand in the international market has gradually increased, domestic machinery prices have become normalized, and the export value of extruders has gradually recovered. Compared with the same period of last year, the export value of each month has changed a lot. As a whole, the export value of extruders is lower than that of the same period of last year, and the decline is obvious. The export volume situation in the first half of this year is not very optimistic. The optimization and upgrading of industrial structure has made the domestic and international markets increasingly demanding the precision of extruder products, whether it can realize the precision production of extruders, and make breakthroughs in multi-layer coextrusion performance, and become a competitive market. The essential.
Starting from the process, we will strengthen the research and development breakthroughs in the precision of products, update the extruder products, and pay attention to the computer control of the machine. We will continue to research and develop on the intelligent and automatic performance, so that the extruder will recover its good momentum on the export.
Through the long-term development of China's plastic extruder industry, the international influence of the plastic extruder industry continues to heat up, the ability to respond to trade care is enhanced, and the industrial technology level is further enhanced. Due to the close connection between China's extruder products and strategic new industries, it has the advantages of high efficiency, energy saving and high cost performance. The export to developed countries is mainly low-end, and this part of consumer demand is rigid. Therefore, the extruder Industry development still has a large market space.
Although China's extruder market is developing rapidly, the export ratio of extruders is still low. Increasing raw material costs and energy cost pressures have made energy conservation and materialization a focus of the extrusion processing industry. At the same time, extrusion technology suppliers are able to develop a wide range of energy-saving solutions from various angles to meet the energy-saving needs of users.
Through the joint efforts of the industry's technology and R&D personnel, some major special types such as exhaust extruder, tandem disc screw extruder, reciprocating pin screw extruder, foaming extruder, and melt gear pump The extruder, tandem multi-stage extruder, planetary screw extruder, etc. are all produced in China, with independent research and development capabilities, and enjoy independent intellectual property rights.
The extruder can be divided into single-screw, twin-screw and multi-screw extruders according to the number of screws. At present, the single-screw extruder is the most widely used, and is suitable for extrusion processing of general materials. The twin-screw extruder has less heat generated by friction, the shearing of the material is relatively uniform, the conveying capacity of the screw is larger, the extrusion amount is relatively stable, the material stays long in the barrel, and the mixing is uniform. SJSZ series conical twin-screw extruder has the characteristics of forced extrusion, high quality, wide adaptability, long service life, small shear rate, difficult material decomposition, good mixing and plasticizing performance, direct molding of powder, and temperature control. Vacuum exhaust and other devices.
In recent years, a large number of theoretical and experimental studies have been carried out on the screw. Up to now, there have been nearly a hundred kinds of screws, and the common ones are separation type, shear type, barrier type, split type and wave type. From the perspective of single-screw development, although the single-screw extruder has been perfected in recent years, with the continuous development of polymer materials and plastic products, new-type screws and special single-screw extruders with more characteristics will emerge.
In plastic extrusion molding equipment, plastic extruders are often referred to as main engines, and the subsequent equipment plastic extrusion molding machines are called auxiliary machines. After more than 100 years of development, plastic extruders have been derived from the original single screw twin screw, multi-screw, and even no screw.
It is believed that in the future, the technology of plastic extruder industry will have a qualitative leap, and it will no longer rely on imports. In the international arena, the influence will continue to heat up and the development prospects are optimistic.
In the past two years, China's plastic extruder market has made great progress and breakthrough. In China's plastic machinery market, extruders as important processing equipment, the development prospects are very optimistic, China's plastic machinery enterprises have increased their squeeze in recent years. With the development of emerging markets, brand awareness will be further expanded, market competitiveness will be further improved, and the proportion of exports to emerging countries will be greatly enhanced.
Although China's extruder market is developing rapidly, the export ratio of extruders is still low. Increasing raw material costs and energy cost pressures have made energy conservation and materialization a focus of the extrusion processing industry. At the same time, extrusion technology suppliers are able to develop a wide range of energy-saving solutions from various angles to meet the energy-saving needs of users.
China's plastic machinery adjustment structure enhances the development space of the extruder industry. At present, the development status of the domestic plastic machinery industry is that there are problems such as low independent innovation capability, low-grade and personalized special-purpose varieties, and low industry concentration. The existence of these problems has led to the plastic machinery industry in China not catching up with the level of foreign plastic machinery as soon as possible.
After long-term development, the international influence of China's press industry has been continuously improved, the ability to deal with trade protectionism has been enhanced, and the level of manufacturing technology and overall strength has been further improved. Therefore, China's extruder industry has many favorable conditions in terms of foreign trade exports. Due to the close connection between China's extruder products and strategic new industries, it has the advantages of high efficiency, energy saving and high cost performance. The export to developed countries is mainly low-end, and this part of consumer demand is rigid. Therefore, the extruder Industry development still has a large market space.
Domestically, China is still in the stage of industrialization, informationization, urbanization, marketization, and internationalization. It is still in the period of important strategic opportunities for development, which will also provide an inexhaustible driving force for the extruder industry. Finally, the recovery of the international market has brought confidence to the extruder companies.
With the advancement of science and technology, the development of plastics has become an indispensable material for people. After long-term development in China, the international influence of the plastic extruder industry has continued to advance, and the ability to respond to trade care has been enhanced. I am trying to get promoted further. Therefore, there are many conditions for the Chinese extruder industry to take advantage of foreign trade.
With the aerospace industry, national defense, kerosene chemical industry, transportation, electronics, electrical and static, and other people's economically tight family property mediation and relocation, the plastic extruder market capacity will be further expanded, and domestically set up in the perspective of independent innovation, energy conservation and environmental protection will further strengthen And the micro-forming rough processing technology, double-drawing equipment, domestically-made modified plastic technology, electromagnetic energy-saving devices, etc., the growth of China's plastic machine industry has ushered in the golden age of Kemen's growth and rapid growth.
In October 2013, 179 imported extruders were imported, with an import value of US$66.79 million. Imports increased by 61.3%. Of course, the increase rate of the company was mainly due to the intermittent decline in the import of extruders from the previous year. In the past years, the import volume of extruders has generally declined. In October, the initial import growth in the second half of the year. In addition, the import of extruders this year was also small and private. I exported 818 extruders in October. The import value was 25.574 million US dollars, down 12.3% year-on-year. From the past year, the total amount of modified plastics has definitely increased significantly in 2012. In the first 10 months of this year, the import of extruders has fallen by 7.3. As China's extruder products are closely related to strategic new industries, they have the advantages of high efficiency and energy saving, and high cost performance. Lord, this part of consumer demand is rigid, so the extruder industry still has a large market space.
In the past two years, China's plastic extruder market has also made great progress and breakthrough. In the Chinese plastic machinery market, the extruder is a critical processing equipment, and the prospects are very decadent. Chinese plastic machine enterprises have expanded their extruders over the years. With the development of emerging markets, brand awareness has further increased, market synergy has further improved plastics, and the share of exports to emerging countries will also be greatly improved.
From an international perspective, China is still in the stage of industrialization, dynamics, urbanization, marketization, and internationalization. It is still in the process of demanding strategic opportunities, which will also give the extruder industry endless development momentum. Finally, the recovery of the international market has brought convictions to extruder companies.
China's plastic extruder industry is moving towards health and sustainable development. From scratch, from import to production, from simulation to independent renovation, the development process is always unsatisfactory, and the lack of evidence is familiar with the ability of Chinese enterprises to produce their own self-reliance. I found my own plastic extrusion machinery to meet my own needs and even the needs of the world.
1. Visually understand the wear and tear of wearing parts
Thanks to the easy opening, the threaded components and the inner bushings of the barrel can be found at any time for effective repair or replacement. It is not discovered when there is a problem with the extruded product, causing unnecessary waste.
2, reduce production costs
When making masterbatch, it is often necessary to change the color. If it is necessary to replace the product, open the open processing area within a few minutes, and also analyze the mixing process by observing the melt profile on the entire screw. At present, the conventional twin-screw extruder needs to use a large amount of cleaning materials to clean the machine when replacing the color, which is time consuming, expensive, and wastes raw materials. The split-type twin-screw extruder can solve this problem. When the color is changed, the barrel can be quickly opened and manually cleaned in a few minutes, so that the cleaning material can be used or not, which saves the cost.
3. Improve labor efficiency
In the maintenance of equipment, ordinary twin-screw extruders often have to first remove the heating and cooling system, and then withdraw the screw as a whole. The split-type twin-screw is not used. Just loosen a few bolts and turn the worm gear handle to raise the upper half of the barrel to open the entire barrel and then perform maintenance. This reduces maintenance time and labor intensity.
4, high torque, high speed
At present, the development trend of twin-screw extruders in the world is to develop toward high torque, high speed and low energy consumption, and the effect brought by high speed is high productivity. The split-type twin-screw extruder belongs to this category and its speed can be increased by 500 rpm. Therefore, it has unique advantages in processing high viscosity and heat sensitive materials.
In the high-speed, high-torque core technology, the asymmetric and symmetrical high-torque gearboxes currently only have the core technology of German and Japanese manufacturers, and their speed can reach 1800 rpm or more. Sichuan Zhongchuang Technology Co., Ltd. is currently one of the main choices for domestic high-end material processing companies, and it is a national independent innovation national encouragement project.
5, a wide range of applications
Wide range of applications, suitable for processing a variety of materials
6, high output, high quality, high efficiency
With the other advantages of a conventional twin-screw extruder, high throughput, high quality, and high efficiency can be achieved.
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