![]() ![]() Setting the back pressure in the molding process can effectively avoid the molten material from entrapping gas during the plasticizing process. When the screw speed of the injection molding machine is high, the gas will enter the plasticizing process and flow to the surface of the injection molded part with the help of the fountain flow, which will produce silver lines on the surface of the injection molded part because it flows through the gate under high pressure. The plasticization process of the product will be accompanied by the generation of gas, which is very likely to cause the product silver streak. Direct contact of the melt with the air because of the temperature difference is prone to solidification, if the lack of treatment, has solidified PEEK will enter the mold, while appearing on the surface of the product with the help of springs, resulting in cold material defects.įor some PEEK injection molded parts, silver streaks near the gate are usually caused by moisture or gas. In order to prevent the nozzle from the phenomenon of flow delay, proper rubber extraction should be set. ![]() Therefore, when the material is injected and pressure-holding is completed, the barrel should be removed immediately to keep the mold and nozzle at a distance (before filling). If the low temperature of the gate sleeve and injection molding machine nozzle contact time is long, after the temperature drops to the PEEK melting point, the molten material is very easy to solidify, thus interfering with the progress of the injection molding process. The temperature of the nozzle can be as high as 400☌, but the temperature around the material does not reach that value, and the great temperature difference causes the heat to dissipate quickly. When the thickness of the product is large, the product needs to be cooled for a long time. PEEK materials are made in a special process. The author takes an aircraft cabin control ring door as an example and discusses defects in the injection molding process and process optimization of PEEK injection molded parts. However, PEEK injection molded parts can also have a variety of defects, including cold material points, silver lines, porosity, fusion marks, warpage, etc. PEEK material has extremely high performance in many areas, and its injection molded parts have great prospects for development. molding should be completed promptly with PE wax to quickly clean the screw, can not let the material of PEEK stay in the screw. PEEK molding temperature 320 degrees ~ 390 degrees C.īaking temperature 160 ~ 1855H ~ 8H mold temperature 140 ~ 180 This material injection molding temperature is too high, the damage to the screw is more serious, in setting the Screw speed can not be too fast, injection pressure in 100 ~ 130MPa injection speed 40 ~ 80. This feature allows it to be used in the production of surgical and dental equipment with high sterilization requirements and repeated use. ![]() PEEK resin can also withstand up to 3,000 cycles of autoclaving at 134 degrees C. The manufacture of ultra-pure water transport pipes, valves, and pumps, in the semiconductor industry, is commonly used to manufacture wafer bearers, electronic insulation diaphragms, and a variety of connected devices.Īs a semi-crystalline engineering plastic, PEEK is insoluble in almost all solvents other than concentrated sulfuric acid, and is therefore commonly used to make compressor valves, piston rings, seals, and various chemical pump bodies and valve components. PEEK resin is the ideal electrical insulator, in high temperature, high pressure and high humidity and other harsh working conditions, but still maintain good electrical insulation properties, so the electronic information field gradually become the second largest application area of PEEK resin. In the automotive industry, due to PEEK resin has good friction resistance and mechanical properties, as the raw material for manufacturing engine covers, with its manufacturing of bearings, gaskets, seals, clutch rings, and other parts in the transmission, brakes, and air conditioning system in the car is widely used. PEEK resin was first used in the aerospace industry, replacing aluminum and other metal materials in the manufacture of various aircraft parts. PEEK has the advantages of high mechanical strength, high-temperature resistance, impact resistance, flame retardant, acid and alkali resistance, hard texture, long service life, etc., and has a large number of applications in the automotive industry, aerospace, medical devices, and other fields. ![]()
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