Brief Introduction to PV Ribbon Rolling Mills

      One sentence positioning: The specialized cold rolling equipment for precision rolling round copper wire into ultra-thin flat copper strip (photovoltaic welding strip substrate) is the core equipment for the production of photovoltaic module welding strips.

1、 Core purpose

      Processing object: Purple copper/alloy copper round wire (incoming wire diameter of 0.1-1.2mm).

      Finished product: Photovoltaic solder strip (tin coated copper strip) substrate, thickness 0.05-0.3mm, width 0.25-3mm, tolerance ± 0.005-0.02mm.

      Core value: Providing high conductivity and easy to weld connection strips for photovoltaic modules, connecting solar cells in series, and exporting current.

2、 Structure and Principle

Typical structure (four rollers/multiple rollers):

      Wire laying → tension control → straightening → precision rolling (multiple passes) → online annealing → cleaning → tin coating → winding.

      Roll: made of hard alloy/high-speed steel, with multiple sets of rollers gradually pressing down to ensure accuracy and surface quality.

Working Principle:

      The round copper wire undergoes progressive plastic deformation through multiple sets of rollers, and is flattened and thinned to the target specification.

      Servo+AGC thickness closed-loop, dynamic adjustment of roller gap, stable tolerance within ± 0.01mm.

      Online annealing eliminates work hardening and improves ductility and conductivity.

3、 Key features

      Ultra high precision: Thickness tolerance ± 0.005mm, smooth surface, no scratches or edge waves.

      High speed stability: Rolling speed of 60-150m/min, can operate continuously for 30 days without any faults.

      Automation integration: PLC+HMI, one click specification change, suitable for GW level mass production.

      Material adaptation: Pure copper, copper alloy, meeting high conductivity and low resistance requirements.

4、 Core parameters (typical)

      Incoming wire: 0.3-0.8mm copper wire

      Finished product: thickness 0.1-0.2mm x width 1.0-2.5mm

      Accuracy: Thickness ± 0.01mm, Width ± 0.02mm

      Speed: 80-120m/min

      Capacity: 120-150 tons/month

5、 Application scenarios

      Photovoltaic ribbon factory: produces interconnect ribbon and busbar for PERC/TOPCon/HJT modules.

      Supporting equipment: often combined with tin coating machines, annealing furnaces, and rewinding machines to form a welding strip production line.

6、 Industry value

      Replace imports, reduce costs by over 30%, and break the monopoly of overseas technology.

      Improve the uniformity of solder strips and increase component efficiency by approximately 0.2%.

      Adapt to the requirements of large-sized, ultra-thin, and irregular solder strips, supporting photovoltaic cost reduction and efficiency improvement.