Introduction

Urea Formaldehyde Molding Compound (UFMC), is widely used in the production of tableware, electrical components, and household items. However, manufacturers often encounter issues such as black spots and material caking during production. Understanding the root causes and implementing effective solutions can significantly improve product quality.

Main Causes of Black Spots

1. Powder Caking & Poor Flowability

• When UFMC powder cakes, its flowability decreases, leading to uneven distribution during molding.

• Poor flowability causes localized overheating, resulting in black spots.

2.Uneven Heating & Dispersion

• If the material is not uniformly heated, some areas may overheat while others remain underheated.

• The overheated sections degrade, forming black spots.

3.Deep Mold Designs

• Deep molds (e.g., cups, bowls) restrict powder movement, increasing the risk of uneven heating.

Effective Solutions

1. Ensure Proper Material Grinding

• Finely ground powder improves flowability and reduces caking.

2. Optimize Mold Design

• Prefer shallow molds (e.g., plates) over deep ones (e.g., bowls) to enhance powder movement.

3. Improve Venting

• Multiple venting channels help release trapped air and reduce overheating.

4. Blend Old & New Material

• Mixing high-flowability new material with old stock improves overall flow characteristics.

5. Use High-Frequency Preheating

• High-frequency preheaters ensure uniform heating, minimizing black spots.

6. Avoid Prolonged Storage

• Use materials promptly to prevent moisture absorption and caking.

Conclusion

By addressing powder flowability, mold design, and heating uniformity, manufacturers can significantly reduce black spots in UFMC production. Implementing these best practices ensures consistent quality and efficiency.