Injection Molding Trouble shooting guide


The purpose of this guide is to identify a broad range of molding problems that can arise in injection molded parts. 

This is intended as a guide only and may not be the optimum solution for every application.

When troubleshooting, it is important to remember that the first step is to identify the true issue.

When making processing changes, make one change at a time and allow two cycles, at a minimum, before moving on. 

If the change made does not fix the problem, then you should put that setting back to it's original setting before making next change.



short Shot

short shot.jpg



Blisters / Bubbles

Blister Bubbles.jpg



Warpage

Warpage.jpg



Cracking / Crazing

Cracking Crazing.jpg



Black Specks

Black Specks.jpg



Sinks and Voids

Sinks and Voids.jpg



Brittleness

Brittleness.jpg



Flow Lines

Flow Lines.jpg



Delaminating

Delaminating.jpg



Dimensional Inconsistency

Dimensional Inconsistency.jpg



Discoloration

Discoloration.jpg



Excessive Cycle Time

Excessive Cycle Time.jpg



Burns in gate area

Burns in gate area.jpg



Burns at the end of fill

Burns at the end of fill.jpg



Flashing

Flashing.jpg



Nozzle Drooling

Nozzle Drooling.jpg



Parts sticking in mold

Parts sticking in mold.jpg



Splay(Silver Streaking)

Splay Silver Streaking.jpg



Sprue Sticking

Sprue Sticking.jpg



Surface Imperfections

Surface Imperfections.jpg



Weak Weld Lines

Weak Weld Lines.jpg





To the best of our knowledge the information contained in this document is accurate, however, we do not assume any liability whatsoever for 

the accuracy or completeness of such information.  

Since we have no control over the use to which others may put our product, we cannot guarantee that results the same as those described 

in this document will be obtained.  The Buyer assumes sole responsibility for results obtained in reliance upon this publication.  

We recommend that persons intending to rely on any recommendation or to use any equipment, processing technique or material mentioned

 in this publication should satisfy themselves as to such suitability and that they can meet all applicable safety and health standards.








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