White streaks or spots

[dinho]

Hi all,

New day with a new challenge in injection molding. the problem that I face in the injection is white spots or streaks in the intern of the part, the material I use is Nylon with Glass Fiber 35 %. first I worked on temperature, the maximum is 290 °C as mentioned in the material datasheet for the mold the temperature 80 (DS between 60-90). Then I try to work in Injection speed (I lowered them) but the Glass Fiber ASpect was good.

Additionnal information :
Backpressure 70 Bar
injection speed 30/50/60 (mm/s) (the spots appeared between 30/50)
Pressure 800 Bar
Mold with 4 cavities (all of them have the same prob.)

Any suggestions would be appreciated.

Thanks.