{"id":33569,"date":"2025-04-17T16:11:42","date_gmt":"2025-04-17T08:11:42","guid":{"rendered":"https:\/\/www.ray-tron.com\/?p=33569"},"modified":"2025-04-17T16:11:48","modified_gmt":"2025-04-17T08:11:48","slug":"avoid-copper-exposure-during-production-and-use-of-copper-clad-aluminum-strip","status":"publish","type":"post","link":"https:\/\/www.ray-tron.com\/en\/avoid-copper-exposure-during-production-and-use-of-copper-clad-aluminum-strip\/","title":{"rendered":"Avoid "copper exposure" during production and use of copper-clad aluminum strip"},"content":{"rendered":"

Copper clad aluminum strip in production and useAvoid "exposed copper"<\/strong>(i.e. the aluminum substrate is exposed) is a very critical quality control point. Exposed copper will lead to poor conductivity, unstable welding, easy corrosion, and seriously affectPhotovoltaic welding ribbon<\/a>performance and component life.<\/p>

Here are some tips to avoidCopper clad aluminum strip<\/a>Key points to note for \u201ccopper exposure\u201d:<\/p>

1. Key points of production process control<\/h2>

1. Copper layer thickness control<\/strong><\/h3>
  • reason<\/strong>\uff1aThe copper layer is too thin (especially at the edge), which may lead to copper exposure due to subsequent rolling or slitting.<\/li>\n\n
  • suggestion<\/strong>\uff1a Depending on the end product application, the copper layer thickness needs to be controlled at \u2265 5\u03bcm, 8~12\u03bcm is recommended.<\/li>\n\n
  • Control method<\/strong>: Use continuous coating or electroplating + calendering combination process to ensure uniformity.<\/li><\/ul>

    2. Rolling uniformity<\/strong><\/h3>
    • When rolling in multiple passes, it is necessary to ensure that the distribution of the pressing amount is reasonable.Prevent excessive thinning of the edge copper layer<\/strong><\/li>\n\n
    • Use precision 20-roll mill, high roll grinding accuracy to ensure uniform pressure<\/li><\/ul>

      3. Strong copper-aluminum bond<\/strong><\/h3>
      • Use diffusion bonding or hot-rolled alloy layer method to avoid "copper peeling" due to weak bonding<\/li>\n\n
      • Pay special attention to the edge joint area, there should be no interlayer, delamination or bubbles<\/li><\/ul>

        2. Precautions for slitting process<\/h2>

        1. Knife sharpness<\/strong><\/h3>
        • If the slitting blade is blunt, it will "tear" the copper layer during the cutting process, resulting in copper exposure at the edge.<\/li><\/ul>

          2. Tension control<\/strong><\/h3>
          • When the tension is too great, the copper layer will be stretched and peeled off.<\/li>\n\n
          • Especially for small-sized products, a constant tension control system is required to protect the integrity of the edges.<\/li><\/ul>

            3. Surface treatment process control<\/h2>

            1. Cleaning process<\/strong><\/h3>
            • Do not use corrosive liquids to clean the surface to prevent corrosion of the copper layer and partial aluminum exposure.<\/li><\/ul>

              2. Tin plating<\/strong><\/h3>
              • If tin plating is used, the pre-treatment must be clean and the plating must be uniform to avoid the copper layer being "eaten through"<\/li><\/ul>

                4. Storage, transportation and subsequent processing precautions<\/h2>

                1. Avoid scratches<\/strong><\/h3>
                • The copper layer is relatively soft. If it is scratched during transportation or processing, the aluminum substrate will be directly exposed.<\/li>\n\n
                • Dust-free gloves, cushioning materials, anti-scratch films, etc. must be used<\/li><\/ul>

                  2. Avoid oxidation corrosion<\/strong><\/h3>
                  • The exposed copper part is very easy to oxidize, resulting in poor welding<\/li>\n\n
                  • So dry storage + sealed packaging + moisture-proof paper or desiccant is required<\/li><\/ul>

                    Summary: The key to preventing copper-clad aluminum strip from exposing copper<\/h2>
                    1. Copper LayerSufficient and uniform thickness<\/strong><\/li>\n\n
                    2. Strong copper-aluminum bond<\/strong><\/li>\n\n
                    3. The slitting equipment is of high precision and the knives are sharp<\/strong><\/li>\n\n
                    4. Subsequent processing and storagePay attention to anti-scratch, moisture-proof and anti-oxidation<\/strong><\/li><\/ol>","protected":false},"excerpt":{"rendered":"

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