This troubleshooting guide will help you:

  • analyze some of the problems encountered in the manufacturing of plastic molded parts,
  • determine the potential causes and
  • suggest solutions.
Small defects on the surface; rough surface
Causes Solutions
  • Undispersed pigment
  • Contaminants present in the product
  • Polymer degradation
  • Moisture

  • Use a suitable carbon black for molding

  • Contact masterbatch supplier, review masterbatch selection
  • Check for: possible sources of contamination, resin quality
  • Ensure equipment is clean
  • Check for: possible sources of contamination, resin quality
  • Dry resin or masterbatch

 

Color performance not achieved
Causes Solutions

  • Pigment or masterbatch dosage not optimized

  • Wrong pigment selection

  • Materbatch not fully distributed

  • Increase level of pigment in part

  • Select pigment with suitable color performance

  • Review masterbatch selection
Poor mechanical properties
Cause Solution

  • Undispersed pigment

  • Contaminants present in the product
  • Polymer degradation
  • Molding conditions
  • Mold design

  • Use a suitable carbon black for molding

  • Contact masterbatch supplier, review masterbatch selection
  • Check for: possible sources of contamination, resin quality
  • Optimize molding conditions
  • Verify proper mold design
Poor gloss
Cause Solution

  • Molding conditions

  • Resin selection

  • Pigment dosage

  • Pigment dispersion

  • Mold finish

  • Moisture

 

  • Optimize molding conditions

  • Contact resin or masterbatch supplier
  • Optimize pigment dosage
  • Use of a suitable carbon black for molding
  • Contact masterbatch supplier, review masterbatch selection
  • Polish mold
  • Dry resin or masterbatch