Custom Coating Roller for Lithium Battery Separator

The AstraRoll Custom Coating Roller for Lithium Battery Separators is a ultra-precision web-handling component designed to meet the rigorous zero-defect requirements of the cleanroom energy sector. As battery separators push the boundaries of thinness (5μm-9μm base matrices), applying a uniform sub-micron safety coating of ceramic particles or functional polymers is incredibly challenging. Any microscopic vibration or roller eccentricity translates directly into coating thickness variations, creating localized thermal risks in final battery cells.AstraRoll solves this by using heavy-duty, multi-tempered forged structures combined with advanced cylindrical grinding technology. Built to withstand continuous contact with highly abrasive ceramic slurries and aggressive solvents (such as NMP or water-based systems), our coating rollers offer optimal chemical inertness, high geometric parallelism, and absolute structural stability to ensure steady, cleanroom-compliant, and high-speed continuous coating operations.

Technical Parameter

Target Application:Lithium-Ion Battery Separator Coating (Alumina Al2O3 / Boehmite / PVDF)

Core Base Material:Premium Forged Alloy Steel (42CrMo) with multi-stage stress relief

Concentricity (Static runout): ≤0.001mm

Straightness: ≤0.002mm

Roughness on roll surface: Ra≤0.04μm

Surface Treatment: Hard Chrome Plating(thickness≥0.1mm)

Max Dimension: φ400*1800mm

Product Applications

Delivers perfect gap control and fluid transfer for high-safety battery membrane lines:

Slot-Die Backing Rollers: Acting as the high-precision reference counter-roller facing the slot-die lip, maintaining a flawless micron-level coating gap.

Micro-Gravure / Anilox Transfer Lines: Precision micro-structured rollers for transferring uniform, low-viscosity ceramic or PVDF slurries onto polyolefin substrates.

Blade Roller Systems: Serving as the heavy-duty base coating roller in knife-over-roll setups for thicker functional barrier applications.

Secondary Rewinding & Guiding in Coating Lines: High-purity, low-inertia guiding rollers that prevent thin separator substrates from scratching or wrinkling post-coating.

Why Choose AstraRoll's Custom Coating Roller?

Micro-Level Concentricity for Flawless Wet Thickness (≤0.003mm): In separator coating, a variation of even 1μm can compromise battery cell consistency and ion permeability. AstraRoll finishes every coating roller on state-of-the-art precision grinders, locking the radial runout below ≤0.003mm to maintain absolute fluid gap stability across high linear web speeds.

Super-Hard ≥HRC 62 Surface Against Abrasive Slurries: Alumina (Al2O3) and bohmite slurries are highly abrasive and quickly score standard steel or chrome rollers, leading to scratch streaks on thin films. Our proprietary electroplating process yields a high-density, multi-layer hard chrome matrix (≥HRC 62) that effortlessly resists micro-abrasion, significantly extending your production runtime.

Zero-Pinhole Surface Integrity (Ra≤0.005μm): Microscopic pinholes or cracks in a backing roller trap slurry residue, causing localized bumps that puncture ultra-thin 6μm separators. AstraRoll uses multi-pass diamond-slurry polishing to achieve a flawless surface, ensuring zero slurry accumulation and absolute separator web safety.

Complete Chemical and Corrosion Immunity: Separator slurries contain complex solvents and binders. Our advanced chrome-sealing treatment creates an inert barrier that resists chemical oxidation and corrosion, preventing any surface degradation or metallic ion contamination from compromising cleanroom battery standards.

Q1. Are you a trader or direct factory?

We are a direct manufacturing factory with over 20 years of expertise in high-end industrial rollers, casters and material handling solutions. Our facility operates with ISO-certified quality management systems, allowing us to maintain full control over production cycles and quality standards. Throughout two decades of growth, we have established deep, long-term strategic partnerships with several listed companies and global automation leaders, proving our reliability as a high-tier industrial supplier.

Q2. What are your main products?

AstraRoll specializes in the engineering and production of three core product lines: Industrial Rollers, Heavy-Duty Wheels, and Precision Casters. We do not just sell components; we provide integrated movement and transport solutions. Our products are widely utilized across high-demand sectors, including: New Energy, Lithium Battery, Mining, Heavy Industry, Medical Institutional, Agriculture and Logistics.

Q3. What about delivery time?

We deeply understand that project timelines are critical.
Standard Products: Usually dispatched within 7–15 working days if the components are in stock.
Customized/OEM Orders: Depending on the complexity and volume, the lead time typically ranges from 20–35 days. This includes time for technical drawing confirmation, specialized tooling, and rigorous pre-shipment testing.
Shipping Methods: We offer flexible global logistics solutions, including FOB and CIF terms. We ship via Sea Freight (for bulk industrial orders), Air Freight (for urgent project needs), and International Express (DHL/FedEx/TNT) for smaller components or samples.

Q4. How can I get a quote for customized products?

Since a significant portion of our business involves specialized engineering, pricing is tailored to your specific technical requirements. To provide an accurate quote, please provide the following details: Technical Drawings or Sketches, Application Environment, Quantity, Special Requests. Our engineering team typically reviews and responds to custom inquiries with a formal quotation within 24–48 hours.

Q5. What is your payment?

TT / Paypal / Western Union / LC / Credit Card etc. are all available to us.