Graphene Calender

Calendering rolls are manufactured from special steel to HRC66-68 hardness with over 20mm single-side hardness depth, ±0.002mm cylindricity, ±0.002mm movement tolerance, and Ra0.02μm surface finish. This level of precision produces graphene conductive films with repeatable thickness and surface quality critical for downstream electrical performance.

The line applies three functional layers — graphene slurry, copper tape conductive adhesive, and LDPE laminating compound — in a continuous roll-to-roll process. Combining slit extrusion die coating, adjustable scraper sizing, and cast lamination eliminates separate processing steps, shortening lead times and reducing material waste.

The drying tunnel recirculates hot exhaust with fresh air supplementation across 12 top-supply sections, significantly cutting heating energy. SCR-controlled digital temperature regulation allows power output to match actual process demand. The patented Chaos Mixing extrusion technology further reduces energy per kilogram of LDPE processed.

Double-station unwinding with auto roll change, EPC alignment on both unwind and rewind, programmable sheet cutting, and a clear touchscreen interface allow 3–4 operators to manage the full line. Precise multi-section tension control keeps substrates tracking smoothly at speeds up to 15 m/min.

Dual-motor roll drive provides stable, smooth rotation under calendering pressure. Siemens electrical controls deliver reliable PLC-based automation. Imported U.S. hydraulic cylinders and a high-precision hydraulic station maintain consistent roll gap pressure across the 0–3mm adjustable range.