In the injection molding process of glass fiber-reinforced materials, fiber floating is one of the most common surface defects. It appears as an uneven surface caused by exposed glass fibers on the part. This issue not only affects the visual appearance of the product but can also negatively impact secondary processes such as painting, coating, or electroplating. Today, we will take a deep dive into the root causes of fiber floating and explore effective solutions.

The surface of glass fiber reinforced products

1. Contributing Factors to Fiber Floating Issues
Fiber floating is a result of multiple interacting factors, primarily involving four key aspects:

Injection Molding Process--Slow filling speed, low melt temperature, low mold temperature
Mold Design--Inadequate venting, hot runner temperature issues, unreasonable flow length, improper gate design
Machine Performance--Insufficient machine capacity or poor operating condition
Material Properties--Abnormal moisture content, viscosity variations, mismatched glass fiber content or type