·Micron-Level Full-Range Dimensional Precision
With radial runout ≤1μm and straightness ≤2μm, this coating roll eliminates coating thickness stripe defects on ultra-thin separators. Conventional coating rollers typically have runout ≥3~5μm, which directly causes transverse coating streaks and localized surface density fluctuations on 5–16μm ultra-thin lithium battery separators during high-speed coating. The integrally forged substrate, combined with multi-stage progressive precision grinding, achieves stable full-range radial runout control within 1μm. Compatible with alumina ceramic slurry and PVDF coating processes such as micro-gravure coating and slot-die transfer coating, it ensures single-side coating surface density error within ±0.3g/㎡, directly enhancing power battery cycle stability.
·Low-Impurity Mirror Substrate with Optional Ceramic/DLC Wear-Resistant Coating
Resists continuous abrasion from alumina slurry while preventing metal particle contamination of the separator. Lithium battery separator ceramic coating slurry contains high-hardness alumina powder. Ordinary chrome-plated rollers are prone to surface scratches and metal flaking during long-term operation, creating micro-short circuit risks inside batteries. Two surface solutions are available: a high-purity dense hard chrome mirror layer, or plasma-sprayed alumina ceramic coating and DLC coating. The coating forms a metallurgical bond with the substrate without debris shedding, resisting slurry abrasion while effectively preventing heavy metal impurities from entering the coating, meeting clean production standards for power and energy storage batteries.
·Integrated Deep-Hole Spiral Temperature-Control Channels
Achieve a whole-roller surface temperature differential ≤±0.6℃, preventing localized slurry curing unevenness and coating color difference at high speed. Unlike single-jacket simple temperature-control rollers, the internally integrated milled double-layer spiral heat exchange channels provide balanced thermal fluid circulation paths. Separator coating processes typically operate at 60–110℃ constant temperature, with whole-roller surface temperature fluctuation controlled within ±0.6℃. This prevents excessive temperature differences between roller ends and the center that would cause slurry flowability variations, ensuring uniform longitudinal and transverse coating across wide separators, compatible with 120m/min high-speed continuous coating lines.
·Ultra-Clean Mirror Substrate
With stable surface roughness Ra0.008–Ra0.015μm, the roll resists slurry adhesion and facilitates online cleaning maintenance. The ultra-fine nano-level mirror-polished surface has no micro-pits to retain ceramic slurry residue, simplifying shutdown cleaning and reducing periodic defects from dried slurry buildup. Compared with ordinary matte coating rollers, particle spots and pinhole defects on separator surfaces are substantially reduced, making it suitable for wet-process and dry-process separator ceramic coating and aramid high-temperature resistant coating premium lines.
·G0.4 Ultra-High Dynamic Balancing Grade
Suitable for low-tension production of ultra-thin separators, suppressing film flutter and separator wrinkling/stretching at high speed. Industry standard coating rollers typically use G1.0 dynamic balancing grade. Targeting the extremely thin and low tensile strength characteristics of separator substrates, G0.4 dynamic balancing calibration suppresses high-speed rotational vibration under low-tension operating conditions, preventing separator stretching deformation, deviation, and wrinkling, reducing ultra-thin substrate web break downtime and effectively improving line productivity.
·New Energy Clean Production Standards
Lithium battery separator coating rolls do not perform embossing or matting functions; their core mission is stable, clean, and uniform transfer of ceramic slurry. Many manufacturers modify ordinary film calendering rollers for coating use, but substrate metallurgy and polishing cleanliness cannot meet lithium industry impurity control standards. Independent clean manufacturing specifications are followed: temperature and humidity controlled finishing workshops, finished product cleaning and dust-free packaging; strict dust control throughout processing, full surface defect inspection before shipment, eliminating scratches, pitting, and pinholes to reduce coating black spots and pinhole defects from the source.
·Long-Term Production Cost Reduction
Wear-resistant anti-corrosion composite coatings resist continuous friction from alumina powder, significantly extending repair cycles and reducing offline polishing and recoating frequency. The mirror surface resists slurry buildup, shortening online cleaning time and increasing effective production hours. High-precision dimensions remain stable long-term through multiple stress-relief heat treatments, with no deformation under constant temperature conditions and no need for frequent roll gap recalibration. Localized minor damage supports localized polishing repair without complete roller recoating, with maintenance costs below general-purpose coating rollers.
·Terminal Battery Quality Enhancement
Uniform and stable separator coating ensures consistency of lithium-ion battery thermal stability and puncture strength. Reduced coating surface density fluctuation decreases cell batch-to-batch variation. Low impurity control standards reduce cell self-discharge and thermal runaway risks, making the product suitable for high-end power lithium batteries, energy storage batteries, and 3C consumer lithium battery separator production requirements.
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