Custom MDO Stretching Roller for Film Orientation Lines

The AstraRoll Custom MDO Stretching Roller is a high-precision thermal control component designed explicitly for multi-axial plastic film stretching machinery processing BOPP, BOPE, PET, PVDF, and lithium-ion battery separator films. Positioned in the orientation section running at significant speed differentials, this roller withstands extreme web tension while providing synchronized speed transmission and highly stable thermal conduction.

Constructed using advanced internal spiral runner engineering, the roller architecture supports rapid, homogeneous media circulation (hot oil or water), keeping temperature variance to a bare minimum. The exterior is finished with a hardened chromium layer and polished to a sub-micron mirror gloss to ensure flawless film tracking without micro-scratching or speed slippage.

Technical Parameters

Product Framework: High-Precision Machine Direction Orientation (MDO) Roller

Core Shaft Base: Forged 42CrMo Alloy Steel / Premium 45# Seamless Tubes

Surface Treatment: Industrial Electroplated Hard Chrome (Thickness ≥0.15mm)

Surface Roughness (Ra): Ultra-Smooth Mirror Polish Ra ≤0.01μm to 0.02μm

Surface Hardness Spectrum: HRC 58 - 62 (Excellent scratch and wear resistance)

Thermal Fluid Design: Dual-Shell Internal Coaxial Spirals for forced flow circulation

Temperature Uniformity: Cross-Web Temperature Variance ≤±0.5℃

Total Indicator Runout (TIR): ≤0.005 mm (Concentricity checked under heated operation)

Dynamic Balancing Level: ISO 21940 Grade G2.5 standard for high-speed tracking

Applications

Lithium-Ion Battery Separators: Processing functional micro-porous polyolefin separators requiring precise speed synchronization and ultra-flat nip tracking.

Optical & Packaging Film Lines: Serving as preheating, stretching, and annealing rollers for high-clear BOPP, BOPE, BOPA, and BOPET film lines.

Fluoropolymer (PVDF/PTFE) Converting: Handling high-modulus technical films running under severe drawing ratios and continuous web tension.

Why Choose AstraRoll's MDO Stretching Roller?

± 0.5℃ Uniform Thermal Grids for Defect-Free Drawing: Any thermal deviation across the face of an MDO roller causes uneven material drawing, resulting in film gauge thickness variation. AstraRoll uses CNC-machined dual-shell internal spirals to force uniform oil/water flow, securing cross-web temperature variation within ≤±0.5℃.

Hard-Chrome Mirror Finish to Eliminate Film Scratches (Ra ≤0.01μm): Sensitive optical or separator films easily develop surface scratches when transitioning between high-tension draw zones. We apply multi-stage micro-honing and ultra-precision cylindrical polishing to achieve a flawless Ra≤0.01μm surface, completely removing pitting and chatter marks.

ISO G2.5 Dynamic Balancing for Vibration-Free Tracking: High linear velocities demand absolute rotational balance to prevent web vibration. Our MDO cores are processed with computer-stabilized dynamic balancing under ISO 21940 G2.5 metrics, securing smooth running dynamics, stable tension profiles, and extended bearing lifespan.

Sub-Micron Concentricity Runout (≤0.005mm Runout): Minor concentricity errors create cyclic web tension waves, ruining film properties. We execute final finish grinding with the core shaft mounted directly on its operating bearing housings. This restricts total indicator runout (TIR) to ≤0.005mm for accurate web tracking.

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.