Compound frames PA12-TR90 TR90 material properties TR-90 (Plastic titanium) is a memory polymer material is currently the most popular ultra-light frame material with super toughness, crashworthiness wear, friction coefficient low, can effectively prevent the movement, because the frame fracture, friction on the eyes and face causing injuries. Its specific molecular structure, good chemical resistance, high temperature environment is not easy deformation, a short 350 degree heat resistant, easy to melt and burn. No chemical residue release, in line with European requirements for food grade material. TR90 frames surface lubricity, density 1.14-1.15, will float on the salt, than other plastic frames lighter, less with about half the weight plate frame, 85% nylon material, can reduce the nose, ears burden for young people to use . It is abrasion resistance, chemical resistance, solvent resistance, weather resistance, non-flammable, high temperature. And it is the memory of a polymer material, resistance to deformation index 620kg / cm2, easy to change. Because the frames TR90 material flexibility, toughness, prone to breaking, strength, not broken, and therefore have a movement security. And it is very resistant to impact: nylon material is more than two times, ISO180 / IC:> 125kg / m2 flexibility to effectively prevent damage in the movement of the eye due to an impact generated. TR90 material glasses and nylon material comparison, TR-90 frame material has the following characteristics: 1, light weight: about half of the plate frame with less weight, 85% nylon material, reduce nose, ears burden, so wear lighter comfortable. 2, colorful: more vivid colors better than ordinary plastic frame. 3, impact resistance: more than twice the nylon material, ISO180 / IC:> 125kg / m2 flexibility to effectively prevent damage in the movement of the eye due to an impact generated. 4, temperature: 350 degrees for short periods of high temperature resistant, ISO527: resistance to deformation index 620kg / cm2. Easy to melt and burn. Frame easily deformed difficult to change, to make frames to wear longer. 5, security: no chemical residue release, in line with European requirements for food grade material. TR90 material than any other pc, cp, etc. spectacle frames material is much more expensive, but also more stringent production process, so TR90 frames price than other several times more expensive. A, memory materials glasses feature a transparent nylon, high temperature: the melting point of 280 degrees; 105 degrees or less deformation; 2, light texture: 85% nylon; 3, impact resistance: more than 2 times; ISO180 / IC:> 125kg / m 4, the same type (plastic memory material):?? ISO527; resistance to deformation index 620kg / cm 5, flexibility, toughness, not broken; 6, non-toxic; high transparency, good weather resistance. B, the advantage for the glasses: 1, reducing the nose, ears burden (light texture); 2, especially for sports mirror: impact-resistant, and there is no sense of burden for a long time to accompany wear; 3, with sports security: flexibility, toughness, not broken; 4, no harmful release, the human body without harm. PA12-TR90 nylon tr90 injection molding process requires: 1. sufficiently dried to a moisture content of less than 0.1% is very important, otherwise the plastic extrusion molding out of the product will be white (gas mist), yellow, foam, silver paper, rattle, looks ugly, poor mechanical properties, and the loss of large raw material; 2. Drying: The best use dehumidifier (the moist air after drying, such as sending dryer) with dry air to take away the raw materials water, so the appearance of the molded products, performance standards; if not dehumidifier, please select the weather is sunny, the air humidity is less than 50 percent when production; 3. If dried sufficiently, or white plastic parts, increase cylinder injection temperature, the raw material fully plastics; judge: Plastic raw materials must be the same color, transparency as injection molding process to show that you are correct. Transparent nylon pa-tr90 injection molding process 1. Drying: The following 80 ℃ (not more than 80 ℃) and dried for 4-8 hours (the dryer must be installed on top of the injection molding machine) 2 cylinder temperature: feed zone: 230-240 ℃ Middle: 255-265 ℃ nozzle section: 265-275 ℃ nozzle: 255-265 ℃ mold temperature: 60-120 ℃ injection pressure: 80-110mpa molding cycle: 20-25 sec screw speed: 30-60 r / min Description : 1 if the filling dissatisfaction: increase barrel temperature 10-15 ℃, do not raise the injection pressure and speed to avoid splashes; 2. If the plastic parts white fog: Increase the barrel temperature 10-15 ℃, pressure 70-100mpa, speed speed, so that the exhaust is good; 3. If you die or become sticky yellow: Reduce the barrel temperature of 10-15 ℃, lower injection pressure and speed; 4. bright spot solutions: (1) Fully Drying is a prerequisite, the elimination of pollution (including water); (2) reduce the temperature of the material, segment adjusting cylinder temperature; (3) increasing the injection pressure; (4) increase or decrease the pre-molded back pressure, screw speed reduction. (5) to improve exhaust flow channel and cavity status; (6) to clean the nozzles, runner and gate potential blockage; (7) shorten the molding cycle; 5: screw and the hopper outlet plug (below plug to heat back to the material) approach: cool in the original injection temperature 30 degrees, while slowing the injection speed, pressure constant.