Here is a do-it-yourself guide to solving the 16 most common injection molding process problems in a step-by-step fashion. These are remedies you can try without the more drastic step of pulling the mold from the machine.
For each problem in the left column, try adjusting the variables listed across the top row in the order suggested by the numbers in the color-coded icons. Try adjusting the variable up or down as the point of the triangle indicates. In some cases (marked by diamond-shaped icons), there is no general rule about whether to raise or lower the value of the variable. So you will have to experiment.
The two right-hand columns point out two different sorts of factors that should be checked: Are nozzle heaters functioning properly? Is resin contamination occurring?
An 8.5 x 11 in. version of this chart with a protective plastic covering, suitable for posting by the molding machine, is available for free from Teknor Color.
Joe Allbritton is senior technical service engineer at Teknor Color Co.’s compounding plant in Jacksonville, Texas, which makes color and additive concentrates and precolored compounds. Allbritton has been with Teknor for 25 years as a color matcher, QC technician, laboratory manager, and in sales and technical service. He may be reached at (903) 586-0583, or e-mail firstname.lastname@example.org.