Polishing Treatment for Plastic Molds
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Causes of Silver Streaks in Injection Molding
1. Phenomenon of silver streaks
A phenomenon in which silver streaks occur on the surface of a molded product.
2. Cause of silver streaks
- Poor air release (gas release)
- Overly small gates, runners, and sprues
- Insufficient degassing of the mold
- Small slug well
- A lot of water adsorbed on the resin
- Insufficient injection pressure
- Overly low mold temperature
- High cylinder temperature
Fast injection speed
3. Solutions
- Create a gas vent
- Increase the size of gate, runner, and sprue
- Degas the mold
- Enlarge the slug well
- Fully pre-dry
- Increase injection pressure
- Increase mold temperature
- Lower cylinder temperature
- Slow the injection speed
- Degas the runner end just below the sprue before entering the product.
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