Injection Molding
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Glass Fiber Exposure (Floating Fiber) Appearing on the Surface of Glass Fiber Reinforced polyamide 46 (high-temperature nylon) Products
Problem Phenomenon
Glass fiber exposure (floating fiber) appears on the surface of glass fiber reinforced polyamide 46 (high-temperature nylon) products, and the surface is rough with silvery filaments
Cause Analysis
The glass fiber length is too long or the content is too high
The injection speed is too low, and the glass fiber is exposed as it orients with the flow
The mold temperature is too low, and the glass fiber fuses poorly with the matrix
The barrel temperature is too low, the melt fluidity is insufficient, and the glass fiber is exposed
The interfacial bonding between the glass fiber and PA is not strong
Solution
Optimize the glass fiber length and content
Appropriately increase the injection speed to reduce glass fiber orientation
Increase the mold temperature to the higher value of 100-140°C to improve fusion
Increase the barrel temperature to the higher value of 290-330°C
Add a coupling agent to improve interfacial bonding
Key Takeaway
Floating fiber of glass fiber PA needs to be addressed from the injection speed and mold temperature
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