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.

Leave a Comment

Related Post

Rubber Molds-1

About Rubber Molds

About Rubber Molds Common Types of Rubber Molds In the manufacturing of rubber molds, some commonly used mold types include: 1. Open Molds Open molds

Read More »

Contact Us