It is understood that the injection molding machine screw for a long time in the high temperature, high pressure, high mechanical torque and high friction environment to work, the first few factors are required by the process conditions, and friction caused by the loss is inevitable. The general screw has been subjected to surface nitriding to improve the surface hardness, that is, to improve the wear resistance. But if you ignore the cause of wear and tear, do not try to minimize wear and tear, will greatly reduce the working life of the screw.
The following will focus on the causes of screw wear and reduce the wear and tear of the method:
Each plastic, there is an ideal plastic processing temperature range, should control the barrel processing temperature, so close to this temperature range. Granular plastic from the hopper into the barrel, the first will reach the feeding section, in the feeding section is bound to appear dry friction, when the plastic heat shortage, melting uneven, it is easy to cause the barrel wall and screw surface wear increases. Similarly, in the compression section and the homogenization section, if the plastic state of the molten state is uneven, will cause increased wear
Speed should be adjusted properly. As part of the plastic plus a reinforcing agent, such as glass fiber, mineral or other filler. These materials on the metal material friction is often much larger than the molten plastic. In the injection of these plastics, if the high speed into, then increase the shear force on the plastic at the same time, will also make the corresponding to produce more shredded fiber, the shredded fiber contains sharp ends, so wear Force greatly increased. Inorganic minerals in the metal surface high-speed taxi, the scrapping effect is not small. So the speed should not be transferred too high.
To remove the debris from the plastic. In general, the original purchase of fresh plastic and no debris, but after transport, weighing, drying, color mixing, in particular, to add recycled material, it is possible mixed with debris. Small, such as metal crumbs, large, such as heat pipe nuts back to the needle, and even a string of warehouse keys, mixed into the barrel have occurred, the damage to the screw is self-evident (the barrel of course, will also be damaged ), It is necessary to install the magnet frame, strict feeding management and monitoring.
Plastic contained in the water, the wear of the screw surface have a certain impact. If the plastic does not remove all the water before injection molding, the residual moisture enters the screw compression section, then the formation of melt before mixing in the molten plastic with high temperature pressure of the "steam particles", with the injection material process screw, from the The segment until the screw head, these "steam particles" in the process of loading and unloading pressure expansion, like a trace of fine impurities in the hard particles, the wall produced friction damage. In addition, for certain types of plastics, at high temperature and high pressure, moisture may become a catalyst that promotes plastic cracking, producing harmful impurities that can erode metal surfaces. Therefore, the plastic injection before the drying work, not only on the quality of the workpiece has a direct relationship, but also affect the working life of the screw.

Injection Molding Machine Due to its wide range of functional diversity, it will continue to maintain its most important position and will occupy two-fifths of the machinery sales market by 2017. According to a recent report, it is expected that the global plastics processing machinery market will grow at an annual rate of 6.9%, 2017 global market will reach 37.1 billion US dollars.
China is by far the world's largest machinery and equipment market, 2012 accounted for 29% of the global market, and will continue to lead the global market demand. India will be the world's fastest growing country, accounting for 12% of the global market share in 2013. According to the global regional market, the US central and southern markets grew fastest, followed by Africa and the Middle East. It is expected that by 2017, by the development of the global transport industry, machinery manufacturers in Asia and the Pacific will be able to obtain the advantages of rapid delivery.
The first three quarters of 2013, China's injection molding machine import and export trade deficit of 48.76 million US dollars, down 72.2% year on year; injection molding machine occupy the top ten imports in the field of 47.7% for the modified plastic. Injection molding machine is one of the largest categories of commercial trade deficit. Extruder is China's foreign trade market after the injection molding machine one of the machinery. The first three quarters of 2013, China's total export extruder 9262 units, 238 million US dollars, in the top ten export destinations accounted for 48.2%.
In recent years, with the downstream demand for plastic products increased, the overall demand for plastic machinery in China's domestic market steady growth. According to the press machine industry, "second Five-Year" development plan, the next five years, the average annual growth of the press industry will be more than 12% of the industry-wide industrial output value and total sales reached 50 billion yuan. As the current domestic market activity is lower than the international market, the domestic situation will lead to more enterprises to the international, can be expected, the next period of time, the press industry will be export heat, domestic fierce competition will be transmitted to the international market , Then, the international market will usher in a fierce and rapid growth trend.
"3D plastic printers will be the fastest growing plastic processing equipment, from the current relatively small market situation expanded to other areas of processing production in the world of construction market with the support of high growth, extrusion machinery sales will welcome To the fastest growth period, "Cleveland Research Group said.
From the breakdown of the species, the first three quarters of 2013, China's total imports to Brazil, Thailand, modified plastics Turkey, Indonesia, the United States and other places of the injection molding machine is far apart, limited to 4544-4962 million; China's injection molding machine imports began to decline, down as high as 18.1%. Overall, the import of a slight increase, but the same period of last year, China's injection molding machine exports accounted for 34.8% Increase slightly.
2012 China's top three injection molding machine import countries were Thailand, Indonesia and Brazil. This year, Indonesia, Brazil, a slight increase in thin, Thailand fell sharply by 36.8%, which means that the overseas injection molding machine market gradually strong, the future of injection molding machines and modified plastics overseas investment needs more prudent.
In a recent study, a better market selling environment is coming, from fixed investment spending and accelerated production of plastic products. Packaging will be the largest market for plastic processing machinery, is expected to 2017 will exceed one-third of total sales. The next largest end market will be consumer products and construction areas.

As we all know, China's plastics processing industry huge development potential for the rapid development of injection molding machine industry opened up a vast space. At present in the plastic processing products, 83% of the injection molding. In recent years due to the automotive, construction, household appliances, food, medicine and other industries on the growing demand for injection products to promote the injection molding technology level of development and improvement.
China's plastic machinery is about 70% injection molding machine. From the United States, Japan, Germany, Italy, Canada and other major producing countries, injection molding machine production are increasing year by year, accounting for the largest proportion of plastic machinery.
With the development of injection molding machine and the continuous expansion of the international market, to the presses and peripheral equipment market has brought greater market and more business opportunities, in the past, most Chinese customers only focus on processing equipment investment, and election Buy relatively cheap auxiliary equipment and peripheral equipment. With the rapid development of the market, such as automobiles, mobile phones, electronic appliances, food and beverage packaging, plastic building materials, etc., in order to meet the demand for high-quality plastic products in the terminal market, Business cooperation.