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Flow Marks
Uneven-thickness type
Record type
Staggered type

 

Molding Defects: Flow Marks

Staggered type flow marks
 
 


This flow-mark pattern is characterized by alternating areas of glossy and cloudy plastic.
 

 

gate

 

Cause
Countermeasures
This type of flow mark is caused by unstable flow at the flow front. - Lower the setting for injection speed.
- Raise the temperature of the plastic and the die.

If this problem becomes worse, it may develop into silver streaking and care must therefore be taken.

 
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