Injection Molding
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Glass fiber exposure (floating fiber) on the surface of glass fiber reinforced polyamide (general-purpose nylon) products
Problem Phenomenon
Glass fiber exposure (floating fiber) appears on the surface of glass fiber reinforced polyamide (general-purpose nylon) products, and the surface is rough with silver filaments
Cause Analysis
（1）The glass fiber length is too long or the content is too high
（2）The injection speed is low and the glass fiber is exposed following the flow orientation
（3）The mold temperature is low and the glass fiber does not fuse well with the matrix
（4）The barrel temperature is low, the melt flowability is insufficient, and the glass fiber is exposed
（5）The interfacial bonding between the glass fiber and PA is not strong
Solution
（1）Optimize the glass fiber length and content
（2）Appropriately increase the injection speed to reduce glass fiber orientation
（3）Raise the mold temperature to the higher value of 60-90°C to improve fusion
（4）Raise the barrel temperature to the higher value of 240-280°C
（5）Add a coupling agent to improve the interfacial bonding
Key Takeaway
Glass fiber PA floating fiber needs to be addressed from injection speed and mold temperature
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