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Injection Molding Troubleshooting Guide

Injection Molding Troubleshooting Guide

Suggested
Remedies

Perform in numerical order by column
Problem
Flash Jetting Knit Lines Non-uniform color Over Mold Breaks Thru Shorts Surface Sinks Surface Splay Parts Sticking in Cavity Poor Adhesion Warp
Add Mechanical Interlocks                   5  
Add Surface Texture                 5    
Add Pneumatic Air Poppets                 8    
Check for Material Contamination       3       2   6  
Check Mold Shut-Off 5                    
Check Vent Depth 6   6         5      
Clean Mold Surface     1         4      
Decrease Back Pressure                      
Decrease Injection Pressure         2            
Decrease Injection Speed 4 1     1     3      
Decrease Hold Pressure 1               1   5
Decrease Material Temperature 3       3   2   2    
Decrease Mold Temperature (Cavity)                 3    
Decrease Shot Size 2       5       4   1
Dry Material 7           7 1   7  
Gate in Thickness Cross Section           6 5        
Imcompatible Materials         4         1  
Increase Amount of Gates           7          
Increase Back Pressure       1              
Increase Hold Pressure           4 1        
Increase Injection Pressure             3        
Increase Injection Speed     2     5       2  
Increase Material Temperature   3 4 2   3       4  
Increase Mold Temperature   2 3     2       3 2
Increase Shot Size           1 4        
Increase Substrate Support       4             3
Move Gate Location   4 5 5     6   6   4
Redesign Ejection Mechanism                 7    
Perform in numerical order by column
Suggested
Remedies
Flash Jetting Knit Lines Non-Uniform Color Over Mold Breaks Thru Shorts Surface Sinks Splay Parts Sticking in Cavity Poor Adhesion Warp
Problem

This information is intended to be used only as a guideline for designers and processors of modified thermoplastics for injection molding. Because injection mold design and processing is complex, a set solution will not solve all problems. Observation on a “trial and error” basis may be required to achieve desired results.

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