Stain marks and injection marks.
1. Features of defect of injection molding.
It is usually associated with the gate area: its surface is dark and sometimes visible to the stripe.
2. Possible causes of problems.
(1) the melting temperature is too high.
(2). The mold filling speed is too fast.
The temperature is too high.
(4). Related to plastic properties.
(5) there is cold material in the nozzle mouth.
3. Remedies
(1) reduce the temperature in the front two areas of the shooting cylinder.
(2) reduce the injection speed.
(3) reduce the injection pressure.
(4) reduce mold temperature.
(5) most parts produced by PE will have a pattern of shooting, which can be used according to the requirements.
Modify the feeding port position.
(6). Avoid cold material as much as possible (control the nozzle temperature).