Custom Rubber-Coated Banana Rollers (Bowed Spreader Rolls)

The AstraRoll Technical Advantage

We engineer our expander rollers to withstand immense radial loads while providing smooth, continuous web expansion:

Uniform Lateral Expansion: The precision-engineered arc dictates a gradual, symmetrical outward pull. This irons out severe wrinkles and prevents lateral shrinkage without tearing delicate substrates like thin plastic films or non-wovens.

Premium Elastomer Sleeves: The outer rubber sleeve constantly flexes during rotation. AstraRoll utilizes proprietary, high-fatigue rubber compounds (NBR, EPDM, Silicone) that resist cracking, ozone degradation, and chemical swelling, ensuring a prolonged operational lifespan.

Frictionless High-Speed Rotation: A curved roller is prone to internal binding. We utilize a dense array of precision, low-friction ball bearings along the dead-shaft. This guarantees the outer sleeve rotates freely, matching the web speed instantly to prevent surface scratching.

Post-Slit Web Separation: When utilized immediately after a slitting station, the banana roller slightly separates the individual cut lanes. This prevents the edges from overlapping or interweaving during the final rewinding process.

Key Specifications

Please note: We manufacture entirely to your machinery's specifications and required web tension.

Outer Diameter (O.D.): Custom from 75mm up to 300mm+.
Face Length: Custom manufactured from 300mm up to 6,000mm+ (for wide-web paper mills).
Bow Amount (Arc Height): Custom engineered based on material elasticity (typically 0.5% to 1.5% of face length).
Sleeve Hardness: 50 to 80 Shore A (Depending on required grip and flexibility).
Operating Speed: Rated for high-speed continuous operation (up to 1,500+ m/min depending on O.D.).

Why Choose AstraRoll?

1. Adjustable Mounting Brackets

The direction of the bow relative to the web path is critical. AstraRoll provides specialized pedestal mounting blocks equipped with worm-gear or manual hand-wheel adjustments. This allows your operators to seamlessly rotate the stationary shaft, fine-tuning the spreading angle without halting production.

2. Factory-Direct Re-Sleeving & Overhaul

Banana rollers are significant capital investments. When the rubber sleeve eventually wears down or hardens, you do not need to discard the entire unit. Ship the roller to the AstraRoll facility; we will inspect and replace the internal bearings, install a brand-new custom rubber sleeve, and dynamically test the unit, restoring OEM performance at a fraction of the replacement cost.

Frequently Asked Questions (FAQs)

Q: Should I choose a Fixed Bow or an Adjustable Bow?
A: If your machine runs the exact same material and thickness every day, a Fixed Bow is more durable, economical, and requires zero maintenance. If your line processes varying substrates (e.g., rigid paper one day, stretchable PE film the next), an Adjustable Bow is required so operators can increase or decrease the curve radius to match the material's elasticity.

Q: How do we orient the bow direction on the machine?
A: Proper orientation is crucial. Generally, the apex (the highest point of the curve) should point exactly into the direction of the web travel, bisecting the entry and exit web paths. Improper orientation will cause the web to compress (creating wrinkles) rather than spread.

Q: We process sticky hot-melt adhesives. Will the rubber sleeve get ruined?
A: Raw rubber will trap adhesives. For these specific coating and converting lines, AstraRoll can shrink-fit a seamless, non-stick PTFE (Teflon) sleeve directly over the rubber surface. This combines the flexible spreading action of the banana roller with the ultimate anti-adhesive properties of Teflon.

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.