Defects and solution in transparent plastic parts
The transparent parts welding spot, craze, crack polystyrene, organic glass, sometimes through the light you can see some sparkling filament like craze.
These patterns also called bright spots or cracks. This is due to the vertical direction of the tensile stress caused stress, the right to the use of polymer molecular heavy flow orientation and unoriented part is folded end rate differences.

Solution:
(1) to eliminate the interference of gases and other impurities, the plastic fully dry.
(2) reduce the material temperature, regulation of barrel temperature, properly increasing the mold temperature.
(3) increase the injection pressure, lower injection speed.
(4) to increase or decrease the pre plastic back pressure, reduce the screw rotation speed.
(5) to improve the situation of flow passage and the exhaust cavity.
(6) cleaning nozzle, runner and gate may jam.
(7) shorten the molding cycle, demoulding after annealing method to eliminate crazing: available on polystyrene at 78 ℃ for 15 minutes, or 50 ℃ for 1 hours, the polycarbonate, heated to 160 ℃ for minutes.