Mold temperature too low

• Cause: If the mold temperature is too low, the melt cools too quickly during flow, causing the glass fibers to not be fully encapsulated by the base resin and float to the surface.
• Solution: Increase the mold temperature appropriately to ensure the melt has sufficient fluidity to uniformly coat the glass fibers. Regularly check the mold temperature control system to ensure uniform temperature across all parts of the mold.

Injection temperature too low

• Cause: When the injection temperature is too low, the melt viscosity is high, making it difficult for the glass fibers to distribute evenly, leading to fiber accumulation on the surface.
• Solution: Increase the injection temperature to reduce the melt viscosity and promote thorough mixing of the glass fibers with the resin. Adjust the screw speed to ensure the melt is fully melted and mixed evenly.

Injection speed too fast

• Cause: A too-fast injection speed results in a high melt flow rate, causing the glass fibers to move towards the surface during flow, forming floating fibers.
• Solution: Reduce the injection speed to make the melt flow more stable, minimizing the chance of glass fibers floating to the surface. Use multi-stage injection speed control to avoid excessive speed during cavity filling.

Improper material selection

• Cause: The chosen material may have too high glass fiber content or poor compatibility between the glass fiber and resin, leading to glass fibers easily floating to the surface.
• Solution: Choose materials with moderate glass fiber content to ensure the fibers are fully encapsulated by the resin. Use modified resins or add compatibilizers to improve the compatibility between the glass fibers and resin.

Unreasonable runner design

• Cause: An unreasonable runner design can lead to excessive melt flow paths or high flow resistance within the cavity, causing the glass fibers to concentrate on the surface and form floating fibers.
• Solution: Optimize the runner design to shorten the melt flow path and reduce flow resistance. Increase the number of gates or adjust their location to ensure more uniform melt flow.

Excessive shear force

• Cause: Excessive shear force during injection molding causes uneven distribution of glass fibers in the melt, pushing some fibers to the surface.
• Solution: Reduce the shear force of the screw during injection molding to prevent excessive damage to the glass fibers. Adjust the screw design by using low-shear screws or optimizing the geometry of the screw.

Rough mold surface

• Cause: A rough or defective mold surface can cause the glass fibers to gather at these spots during melt flow, forming floating fibers.
• Solution: Improve the surface smoothness of the mold, regularly polish it to reduce the chances of glass fiber aggregation. Use mold surface treatment techniques (such as chrome plating) to improve the mold surface smoothness.