• warning: include(head.php) [function.include]: failed to open stream: No such file or directory in /home/vydyne/public_html/themes/acquia_prosper/page-flashnode.tpl.php on line 4.
  • warning: include() [function.include]: Failed opening 'head.php' for inclusion (include_path='.:/usr/share/pear:/usr/share/php') in /home/vydyne/public_html/themes/acquia_prosper/page-flashnode.tpl.php on line 4.

Discoloration

Suggested Corrective Actions

Machine

  • Check for proper feed throat cooling.
  • Lower back pressure.
  • Lower material melt temperature.
  • Lower nozzle temperature.
  • Lower rear zone heat.
  • Move mold to machine with smaller cylinder.
  • Purge cylinder.
  • Reduce screw RPMs.
  • Shorten cycle time.
  • Use smaller machine so shot size = 40% to 80% of barrel's polystyrene capacity rating.

Material

  • Examine material in hopper and freshly opened containers for off-color contamination source.

Mold

  • Check venting.
  • Reduce temperature of hot runner block.