Introduction to Floating Fiber
In the production of glass-fiber reinforced nylon (PA), several issues can arise, including filling difficulties due to high melt viscosity, performance variations from uneven mixing, and surface defects like burning, floating fibers, material streaks, and warpage. The “floating fiber” phenomenon, also known as “fiber exposure,” is a significant surface quality problem that affects the appearance of plastic products, especially in 3C products where aesthetic requirements are high.
Understanding Floating Fiber
Floating fiber, or fiber exposure, refers to the visible presence of glass fibers on the surface of the product, making it appear rough and unappealing. This issue can be attributed to three main factors:
- Compatibility: Poor compatibility between glass fibers and nylon.
- Density Differences: Mismatch in the density of glass fibers and the base material.
- Fountain Effect: During injection, the nylon melt forms a “fountain” effect, causing glass fibers to move to the surface. Due to the lower temperature of the mold, these fibers quickly solidify and become exposed if not fully encapsulated by the melt.
Solutions for Floating Fiber
To address the “floating fiber” issue, consider the following solutions:
- Improve Compatibility: Enhance the compatibility between glass fibers and nylon.
- Adjust Density: Modify the density of the glass fibers and nylon to better match.
- Optimize Molding Conditions:
- Increase Filling Speed: Faster filling can help encapsulate the fibers.
- Raise Mold Temperature: Higher mold temperatures reduce rapid solidification.
- Lower Screw Metering Section Temperature: Reducing the temperature in this section decreases the melt volume, helping to manage fiber distribution.
Conclusion
The “floating fiber” phenomenon in glass-fiber reinforced nylon is a common challenge in injection molding. By addressing compatibility, density differences, and optimizing molding conditions, manufacturers can significantly improve the surface quality and overall appearance of their products.
Baozhuan’s solution:
Floating fiber modifier BZFF418 is used to improve GFPA surface floating fiber,and has the following advantages:
– Effective at Low Additions: BZFF418 requires a small addition rate to achieve significant improvements in fiber exposure, outperforming most commercially available additives such as silicones, TAF, and hyperbranched agents.
– Enhanced Flowability: It improves the flowability of the system with minimal impact on mechanical properties.
Chongqing Baozhuan New Material Technology Co.,Ltd has a team of senior R & D, marketing and sale in the polymer industry, focusing on the innovative R & D, production and sales of high-end plastic additives.The main products are silicone masterbatch, silicone powder, flame retardant, flame retardant synergist, light stabilizer, rheological agent, laser marking additives, compatilizing dispersant, lubricating dispersant, adsorbent and so on. Adhering to the business philosophy of integrity, innovation, pragmatism and efficiency, the company is committed to becoming an expert in the overall solution of high-quality polymer additives.
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