How to reduce the injection molding machine screw wear

Date：2016-07-08 09:36:35

Each plastic injection molding machines, has an ideal temperature range of plastics processing, injection molding machine barrel should be controlled processing temperature, bringing them closer to this temperature range. Granular plastic injection molding machine from the hopper into the barrel, will first reach the feed zone, appears dry friction in the feed zone is bound, when these plastic insufficient heat, melt unevenly, it could easily lead to the cylinder wall and screw injection molding machines increased surface wear Big. Similarly, in the compression section and homogenizing section, if the plastic injection molding machine in a molten state of disorder uneven, will result in increased wear

    Speed ​​should be adjusted appropriately. As part of the plastic injection molding machines added enhancers, such as glass fibers, mineral or other fillers. These substances on metal friction force is often much greater than the molten plastic. When these plastics injection molding machine, if you use a high speed, then raise the plastic shear force at the same time, it will also make a corresponding strengthening produce more torn fibers being torn fibers contain sharp end, so greatly increased force injection molding machine wear. Inorganic minerals at the surface of the metal high-speed taxiing, the scraping action is not small. So speed should not be set too high.

    To check in addition to the injection molding machine plastic debris. In general, fresh plastic original purchase and there is no debris, but after transportation, weighing, drying, blending, especially renewable add back material, there may be mixed with debris. As the end of the small metal shavings, such as fever circle big nut clips, or even warehouse key clusters, mixed into the barrel have had happened, this damage is self-evident screw up (of course, will also damage the cylinder ), so you must install the magnet frame, strict feeding management and monitoring.

    Plastic Injection Molding Machine contained in water have an impact on the wear surface of the screw. If the plastic injection molding machine will not exclude all water before injection, residual moisture before entering the compression section of the screw, is formed in the molten plastic melt blending the "steam particles" with a high-temperature pressure, with the injection process feed screw propulsion, from the homogenized section until the screw head, these "steam particles" in the process of relief plunger expansion, like those many fine durum impurities on the wall friction produce damaging effects. In addition, certain types of plastic at high temperature and pressure, water may become a catalyst to promote the plastic cracking, corrosion of metal surfaces can produce harmful impurities. Thus, the plastic injection molding before drying work, not only on the part quality has a direct relationship, but also on the screw working life.

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