Common Issues in Aluminum Foil Manufacturing Process and Corresponding Solutions

1. Quá trình cán: Shape Control and Thickness Uniformity

• Vấn đề: During ultra-thin rolling (ví dụ., double-zero foil), problems like poor shape (edge wave, center buckle) and thickness variation frequently occur, affecting product flatness and consistency.
• Giải pháp:
  • Employ advanced automatic shape control systems, combined with multi-zone cooling and precise roll crown design, to adjust the roll gap profile in real-time.
  • Utilize high-precision automatic gauge control systems, integrated with online laser thickness gauges for monitoring and feedback, ensuring consistent thickness both longitudinally and transversely.

2. Quá trình ủ: Property and Surface Quality Control

• Vấn đề: Improper annealing can lead to substandard mechanical properties (too soft or too hard) or cause defects like oil stains, dính vào, and surface oxidation/discoloration.
• Giải pháp:
  • Precisely define and control the annealing temperature curve and soaking time based on alloy composition and final application requirements.
  • Use annealing furnaces with high-purity protective atmospheres and ensure effective removal of rolling oil before annealing to prevent carbon residue.

3. Surface Defects: Pinholes and Oil Contamination

• Vấn đề: Giấy bạc càng mỏng, the higher the probability of pinholes, which compromises its barrier properties. Residual rolling oil or contamination leads to surface oil stains.
• Giải pháp:
  • Optimize melt purification and filtration processes to reduce inclusions in the ingot; maintain a clean rolling environment to prevent embedding of hard particles.
  • Enhance the filtration and management of rolling oil, and implement effective cleaning or degreasing processes before slitting.

4. Quá trình rạch: Edge Quality and Winding

• Vấn đề: Burrs and edge curling during slitting, or winding defects like telescope and raised edges due to uneven tension.
• Giải pháp:
  • Use high-precision, sharp slitting tools and establish optimal parameters for knife ring clearance and overlap.
  • Apply constant tension or taper tension control systems, coupled with high-rigidity winding shafts, to ensure neatly wound coils.

The implementation of these solutions relies on precise control of process parameters, investment in high-precision automated equipment, and a comprehensive quality monitoring system throughout the entire production process.