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plastic delamination

• Delamination - plastic injection troubleshooter


• Description:
Separation of layers in the moulded part that can be peeled off, flaking of surface layers. It results from insufficient layer bonding due to inhomogeneities and high shear stresses.

• Causes:
machine
· injection speed too high
mould
· mould too cold
· sharp corners in gate area
· shear heat caused at sharp corners
material
· melt too hot
· poorly melted
· incompatible colour dyes
· cross contamination with other polymers
· too much use of recycled material


• Actions:
1st
increase melt temperature
2nd
increase mould temperature
3rd
decrease injection speed
4th
eliminate contamination
5th
check percentage regrind
6th
dry material
7th
purge equipment
8th
change material
9th
radius all sharp corners at gate


contact: jmfalcao@moldplast.com