Analysis of the causes of transparent defects in injection molded products and solutions. Transparent parts of melted spots, silver streaks, cracked polystyrene, and plexiglass. Sometimes, some sparkling filaments of silver can be seen through the light. These silver streaks are also known as spots or cracks. This is because the stress in the vertical direction of the tensile stress is generated, and the weight of the polymer molecule is expressed by the heavy flow orientation and the difference in the folding rate of the unoriented portion. Bath Hardware Set,Brass Bath Hardware Set,Gold Bathroom Accessory Set,Luxury Bath Hardware Sets Kaiping Jenor Sanitary Ware Co., Ltd , https://www.kpjenorsanitary.com
Solution:
(1) Eliminate interference from gases and other impurities, and dry the plastic sufficiently.
(2) Reduce the temperature of the material, adjust the temperature of the barrel in stages, and appropriately increase the mold temperature.
(3) Increase the injection pressure and reduce the injection speed.
(4) Increase or decrease the pre-plastic back pressure and reduce the screw speed.
(5) Improve the flow path and cavity exhaust conditions.
(6) Clean up possible blockages in the nozzles, runners, and gates.
(7) Shorten the molding cycle, and eliminate the silver streaks by annealing after demolding: keep the polystyrene at 78 ° C for 15 minutes, or 50 ° C for 1 hour, and heat the polycarbonate to 160 ° C for more than a few minutes. .
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