Incomplete filling of cavity

  • Optimize venting system

  • Raise dosage volumn

  • Raise mass temperature

  • Increase injection rate

  • Increase rpm

  • Raise mold temperature

 

 

 

Dull and glossy streaks on the surface (Tiger marks)

  • Increase injection rate

  • Raise mass temperature

  • enlarge gate

  • Raise mold temperature

  • Optimize holding pressure and time

  • Improve mold surface

 

 

 

Sink marks on component part

  • Increase holding pressure

  • Raise mass temperature

  • Raise injection rate

 

 

 

Air entrapment

  • Raise mold temperature

  • Increase back pressure

  • Increase rpm

 

 

 

Demolding of the part difficult

  • Extend cooling time

  • Decrease Cylinder- and Masstemperature

  • Decrease mold temperature

  • Reduce dosage volumn

  • Increase surfaces roughness in the mold

  • Decrease holding pressure and time

  • Reinforce mold

  • Increase demolding slant

  • Additional ejectors

 

 

 

Insufficient adhesion of substrate layer

  • Raise mass temperature

  • Increase injection rate

  • Increase holding pressure and time

  • Avoid mold lubricants and release agents

  • Pre-mold contaminated or too cold

 

 

 

Black marks at the end of the flow line (diesel effect)

  • Optimize venting system

  • Reduce injection rate and compare with initial conditions

 

 

 

Moist surface streaks

  • pre-dry material

 

 

 

Clotting on the molded part

  • pre-dry material

 

 

 

Flash formation on the molded part

  • Increase locking pressure

  • Decrease injection rate

  • Reduce injection pressure

  • Reinforce mold

  • Reduce mass temperature

  • Reduce mold temperature

  • Decrease rpm

  • Revise separation

 

 

 

Burn marks on the molded part

  • Reduce mass temperature

  • Optimize venting

  • Reduce mold temperature

  • Decrease rpm

  • Check temperature sensor

 

 

 

Surface spalling

  • Optimize holding pressure and time

  • Optimize mass temperature

  • Optimize injection rate

 

 

 

Color marks during batch admixture

  • Optimize back pressure

  • Reduce cylinder temperature and rpm