Core De-silvering PV Metallization Tech
SMIDA Low-Temp Controlled Three Roll Mill Solves Oxidation & Agglomeration of HJT Copper Paste
2026-06-30
PV Industry Enters Full De-Silver Era, Low-Temperature Copper Paste Becomes Mainstream Cost-Saving Solution
Rising silver prices drastically lift PV metallization costs. Low-temperature copper paste & silver-coated copper paste cut silver consumption by 60%-70%, fit 180-200℃ low curing of HJT/BC cells and reduce reliance on scarce silver resources, becoming essential for mass production of 0BB busbar-free fine grid printing.
However, nano copper powder brings three critical production limits unsolvable by traditional grinders:
- Severe oxidation risk: Shearing heat generates non-conductive copper oxide and damages conductivity, requiring grinding temperature rise controlled below 25℃;
- Severe nano-powder agglomeration: Large copper clusters clog screens and cause broken grid lines, demanding stable fineness ≤3μm;
- Poor dispersion for high-viscosity paste: High filler loading leads to loose grid lines with weak adhesion, accelerating solar cell degradation.
SMIDA Ultra-Mirror Precision Three Roll Mill Eliminates 3 Major Bottlenecks of Low-Temp Copper Paste
Custom-built closed water-cooled three roll grinding system for PV copper paste, paired with micron servo gap adjustment on high-hardness mirror rollers to match strict copper paste requirements in temperature control, shear force and purity:
1. Closed-Loop Circulation Cooling Limits Temperature Rise to Stop Copper Oxidation
Full water circulation cooling inside rollers continuously dissipates shear heat, restricting overall temperature rise ≤25℃ to prevent nano copper oxidation. It fully retains original paste conductivity and extends storage stability of copper slurry.
2. Gradient Differential High Shear Achieves Stable Submicron Fineness ≤3μm
HRC60 ultra-mirror ceramic rollers (Ra≤0.02μm) create powerful shear force via triple counter rotation. Multi-pass grinding fully breaks copper agglomerates to stabilize fineness under 3μm, compatible with 0BB fine grid printing, eliminating screen clogging & broken lines for stable GW-scale production lines.
3. Media-Free Roller Grinding Delivers Zero Contamination
No grinding beads to generate abrasive impurities unlike bead/ball mills. Materials only contact polished ceramic rollers to meet ultra-high purity standards for PV copper paste, preventing electrode leakage and long-term module degradation for HJT, TOPCon & BC cells.
4. Wide Compatibility for High-Solid & High-Viscosity Copper Paste
Stably processes silver-coated copper & pure low-temp copper paste with 70%-90% solid content and millions cPs viscosity without pre-dilution, covering lab R&D small models to ton-level mass production units.
5. Intelligent Recipe Storage & Inline Particle Monitoring for Zero Batch Deviation
Touchscreen stores exclusive grinding recipes for copper paste with real-time inline fineness inspection. Uniform particle size & dispersion across all batches minimizes production fluctuation and stabilizes solar cell conversion efficiency.
Full Application Scenarios for PV De-Silvering Paste Lines
- HJT heterojunction front & back low-temperature copper paste
- BC back-contact silver-coated copper conductive paste
- TOPCon busbar-free fine grid low-temp copper paste
- PV silver-copper conductive adhesive & dielectric paste Copper paste processed by multi-pass SMIDA three roll mill features evenly dispersed powder without large particles, delivering smooth dense printed grids with strong electrode adhesion and outstanding thermal-humidity aging resistance.
SMIDA Three Roll Mill – Core Equipment for PV Manufacturers Cutting Silver Costs
Compared with traditional grinding machines, SMIDA low-temp controlled three roll mill resolves copper paste oxidation, agglomeration and purity bottlenecks, slashing silver raw material costs while boosting cell efficiency & module lifespan. Wear-resistant ceramic rollers extend service life with simple cleaning, ideal for large-scale PV factory expansion. It empowers PV supply chains to reduce precious metal reliance and achieve low-carbon low-cost manufacturing.
Contact SMIDA technical team for free copper paste testing & complete production line layout design.
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