Custom Pre-Heating Stretching Roller for Lithium Battery Separator Industry

The AstraRoll Custom Pre-Heating Stretching Roller is a highly specialized thermal-management solution developed for the next generation of energy storage material lines. In lithium battery separator production, the film must be uniformly brought to precise annealing and stretching temperatures to enable clean lamellar crystal tearing and micro-void structure control.

Our rollers are manufactured from premium forged alloy structures, utilizing precision structural optimization to guarantee zero physical bowing or deflection under extreme film web tension. Designed to operate under sustained oil or high-temperature water circulation, each stretching roller features a tailored surface topography (from matte chrome matrix to high-purity mirror plating) to prevent web slippage, maximize heat distribution, and eliminate residual stresses that compromise battery cell safety and high-rate discharge cycling efficiency.

Technical Parameter

Concentricity (static run out):≤0.01mm

Temperature difference on roll face: ≤0.5 degree

Roughness on roll surface:Ra≤0.004um

Surface treatment: chrome plating (plating thickness≥0.1mm), mirror by polishing

Max dimension:Φ1000*8000mm

Product Applications

Engineered for advanced polymer orientation and crystal structure manipulation in cleanroom energy fields:

Dry Process (Uniaxial Stretching) Lines: High-uniformity pre-heating and machine direction orientation (MDO) for PP-based lithium battery separators.

Wet Process (Biaxial Stretching) Lines: Critical heating and structural conditioning during MD stretching phases for high-porosity ultra-thin PE separator matrices.

Ceramic Coating Base Substrates: Secondary web handling and stabilization rollers for coating lines applying alumina (Al₂O₃) or PVDF safety layers onto bare separators.

Supercapacitor Membrane Extrusion: Thermal rollers for handling high-performance porous separator sheets in alternative energy storage setups.

Why Choose AstraRoll's Pre-Heating Stretching Roller?

Dynamic Thermal Equilibrium (≤±0.5℃): Polyolefin separator performance heavily relies on localized crystalline melting behavior. Any minor thermal band discrepancy causes uneven web stretching, leading to irregular pore distribution and localized high-voltage short-circuit risks. Our simulated double-helix thermal paths provide symmetry in heat exchange, maintaining a stable temperature field across the roller face.

Anti-Slip Surface Topography Engineering: High-speed stretching lines apply substantial tension which causes film slippage against ultra-smooth rollers, ruining the surface quality. AstraRoll applies custom, micro-structured matte chrome or fine-grain textures that optimize the friction coefficient. This locks the film firmly to the roller for perfect stretching control without causing scratches or pinholes on thin 6-9 μm sheets.

Zero-Deflection Rigid Forged Hub Matrix: Under sustained multi-ton winding and stretching tension, standard welded steel tube rollers suffer from microscopic centerline deflection. AstraRoll uses heavy-duty 42CrMo alloy forged steel with multiple tempering steps. This eliminates all structural internal stresses, keeping radial runout locked below ≤0.005mm under continuous 150℃ thermal loads.

Full Cleanroom Chemical Inertness: Battery separator production demands strict raw material purity. Our advanced hard-chrome sealing technology yields a high-density, completely non-porous outer shell. This shell remains non-reactive to the plasticizer oils, solvents, and trace chemical outgassing common in wet process separator extraction lines, guaranteeing contamination-free film processing year after year.

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.