Banana Roller Manufacturer in India — Bow Roll & Expander Roll Supplier Since 1995

Krishna Engineering Works is one of India’s most established banana roller manufacturers, with over 25 years of experience designing, manufacturing, and exporting precision wrinkle-removing rolls to industries across the world. Based in Ahmedabad, Gujarat, we manufacture and supply a complete range of banana rollers, bow rolls, expander rolls, metal bow rolls, metal expander rolls, slat expander rolls, and industrial rubber rollers — each built to your exact machine dimensions, web width, and speed requirements.

We are an ISO 9001:2008 Certified Company and recipients of 3 National Awards and 2 International Awards for Quality Manufacturing. Our rolls operate in the Textile, Nonwoven, Paper, Flexible Packaging, Tire-Cord, Plastic Film, Pharmaceutical, and Leather industries, in plants spread across India and in over 30 countries including the USA, Canada, Australia, Brazil, Russia, France, South Africa, and Mexico.

If wrinkles, baggy centers, slack edges, or slit-web interleaving are slowing your production line or causing rejects, our bow rolls and banana rollers are built to solve those problems — at moderate speeds and at high-speed applications above 300 metres per minute. Learn more about Krishna Engineering Works, our factory, and our 25-year manufacturing history.

What Is a Banana Roller and How Does It Work?

A banana roller — also called a bow roll, bowed roller, spreader roller, curve bar expander, or wrinkle removing roll — is a web handling component with a deliberately curved (bowed) shaft. When a continuous web of material such as film, fabric, paper, foil, or nonwoven passes over this curved surface, the geometry creates differential path lengths across the web width.

The center of the web travels a shorter path than the edges. That difference generates a consistent outward lateral force, which spreads the web from the center toward the edges and removes wrinkles, baggy middles, and slack borders without stretching or damaging the material itself.

The rubber sleeve on the roll rotates freely around the fixed bowed shaft on sealed ball bearings, driven entirely by web tension — no motor required. A worm-and-worm-wheel gearbox with a hand wheel lets operators adjust the bow angle through a full 360 degrees. This means wrinkle removal can be fine-tuned for any material type or web speed without stopping the line. Once the right bow angle is found, the shaft is locked to hold that setting consistently across a full production run.

The recommended installation ratio is 3:1 — lead-in distance to lead-out distance — with the roll positioned perpendicular to the web direction. For a 650 mm web width running below 50 metres per minute, a bow of 90 mm on a 30 mm shaft diameter is typically sufficient. For a 4500 mm web width at 1000 metres per minute, the shaft diameter rises to 75 mm or more to keep runout and vibration within acceptable limits.

For line speeds above 300 metres per minute, rubber-sleeved bow rolls wear quickly under high tension. At those speeds, a metal expander roll with a hard chrome surface is the correct choice. Chrome holds up to abrasion, handles high tension without deforming, and is standard equipment on paper mill slitter rewinders, calenders, and MG cylinders running 24 hours a day. See full technical details and dimensions on our Bow Roll page.

Why Do Manufacturers in India and Globally Choose Krishna Engineering Works?

Banana roller performance depends directly on manufacturing precision. A poorly balanced roll vibrates at speed and damages bearings. Incorrect bow geometry fails to spread the web. Mismatched sleeve material wears out fast and marks sensitive surfaces. After 25 years of production and exports, our process addresses every one of those variables — before a roll leaves our Ahmedabad facility.

Here is what plant engineers and OEM buyers consistently tell us sets our rolls apart:

• Custom manufacturing up to 8,000 mm length: We produce rolls in any working width your machine requires. Diameters up to 300 mm are available. Sleeve materials include natural rubber, EPDM, silicone, synthetic nitrile, nylon, Teflon, and hard chrome-plated metal — matched to your speed, tension, chemical environment, and surface sensitivity.
• 360-degree adjustable bow angle: Every adjustable bow roll we ship includes a worm-worm wheel gearbox with a hand wheel and counter pedestal bearing block. Bow angle can be set anywhere through the full 360 degrees. When maximum wrinkle removal is reached, the bow is locked in position so settings do not drift during production.
• Foot mount and wall mount options: Mounting brackets are configured to your machine. Both foot-mounted pedestals and wall-mounted brackets are available, with the bow-adjustment gearbox built into the bracket assembly for easy operator access.
• Single-acting and double-acting models: A single-acting bow roll holds one fixed bow position — right for consistent, single-material production lines. A double-acting bow roll allows the bow angle to reverse direction, giving additional flexibility when processing multiple material grades or handling complex web paths on the same machine.
• Verified quality at every stage: Each roll is checked for bow geometry, roundness, shaft runout, and bow angle accuracy before dispatch. Rubber sleeves are tested for Shore hardness uniformity and bond strength. Metal rolls are inspected for chrome layer thickness, surface finish, and balance.
• Global supply with fast turnaround: Our production capacity handles bulk OEM orders alongside single replacement rolls. We export to over 30 countries regularly, and delivery timelines are confirmed in writing at the inquiry stage — not estimated loosely after order placement.
• 25 years with 5 quality awards: We have received 3 National Awards and 2 International Awards for Quality Manufacturing — independent recognition that our products meet standards other manufacturers aspire to.

View our certifications, ISO documentation, and quality awards.

What Types of Banana Rollers and Bow Rolls Does Krishna Engineering Works Supply?

No two production lines are identical, and no single roll type fits every application. We manufacture eight distinct product types so you can match the correct roll to your material, speed, tension, and machine layout. See our full product range here.

• Rubber Banana Roller: The most widely used wrinkle-removing roll. A bowed shaft with a free-rotating abrasion-resistant rubber sleeve, suitable for textile, paper, and flexible packaging lines at moderate speeds. Ideal for separating slit webs at the winder and for eliminating wrinkles before coating, laminating, or printing stations. Available with natural rubber, EPDM, nitrile, and silicone sleeve options depending on chemical and temperature exposure.
• Bow Roll (Standard Expander Roll): The classic wrinkle removal device for printing, lamination, and slitter rewinder lines. The bowed shaft and rubber sleeve assembly operates on web tension alone with no external drive needed. Supplied with foot or wall mount brackets and the full gearbox adjustment system as standard.
• Expander Roll (Variable Bow): A broader category covering both rubber and metal variants, used where web spreading is the primary objective alongside wrinkle removal. Common in nonwoven production lines, technical textile processing, and plastic film slitting where multiple slit lanes must stay separated and under uniform tension.
• Wrinkle Removing Roll: A dedicated wrinkle-elimination roll used on slow-to-medium speed lines where precise tension control and a gentle spreading action are needed. Ideal for sensitive surface materials including coated papers, laminates, and adhesive films.
• Metal Bow Roll: A segmented metallic bow roll with a hard chrome-plated surface. Purpose-built for paper industry applications at high speeds — slitter rewinders, calenders, poop reels, and MG cylinders. Does not wear under high tension and high speed where rubber sleeves fail within weeks. The go-to choice for paper mills running 600 or more metres per minute.
• Metal Expander Roll (Segmented): A heavy-duty metallic segmented bow roll with hard chrome surface. Each segment rotates independently on its own bearing, distributing the spreading force across wider webs with greater precision. Used on high-speed paper machines and film lines where a single rubber-sleeved roll cannot maintain consistent spread across the full working width.
• Metal Banana Expander Roll: Combines the bowed geometry of a banana roller with fully metallic construction. Built for tire-cord and heavy technical textile lines where web tension is extreme and the material is abrasive. Hard chrome surface handles continuous production without degradation.
• 3 Curve Bar Expander: A three-point curved bar design that delivers enhanced spreading force across the web width. Suited to applications where a standard single-bow expander does not provide sufficient spread, particularly on wide-web converting and nonwoven lines.
• Slat Expander Roll: Uses rigid aluminum slats in place of a continuous rubber sleeve. The slat mechanism applies a more aggressive and controlled spreading action, suited to slow-speed applications such as coating cloth machines, flat bed printing machines, artificial leather batching machines, and heavy fabrics where a rubber sleeve does not provide enough grip. Available in wooden slat with felt covering, and aluminum slat variants in 6-inch, 8-inch, and 12-inch diameters at any working width.
• Repairing and Servicing: We rebuild, re-sleeve, and recondition worn bow rolls and banana rollers from any manufacturer. If your roll is vibrating, the rubber sleeve is worn through, or the gearbox adjustment is stiff, our service team restores it to original specification. We also offer dedicated bow roll repairing, banana roller repairing, and expander roll repairing services, along with re-coating of rubber rolls for extended sleeve life.
• Air Shaft: Precision air shafts for reliable roll-to-roll web handling on slitter rewinders, laminators, and converting machines. Supplied alongside our bow roll and expander roll range for complete web handling solutions.
• Rubber Fillet: Industrial rubber fillets for sealing, web guiding, and precision web handling applications. Available in custom profiles and hardness grades to match your process requirements.

Which Industries and Machines Use Banana Rollers and Bow Rolls?

Banana rollers appear on almost any machine that processes a continuous web of flexible material. The same core problem — wrinkles, slack edges, slit interleaving — shows up across dozens of industries, and a correctly specified bow roll solves it on all of them. See all industries we serve or browse applications by machine type.

• Flexible Packaging and Converting: Rotogravure printing machines, flexo printing machines, lamination machines, slitter rewinders, and BOPP cutting machines all rely on banana rollers to keep film webs flat and under uniform tension. A single wrinkle in a packaging film causes seal failures, print register errors, and laminate delamination — all costly defects that a properly set bow roll prevents before the web reaches the critical station.
• Textile Processing: Stenter machines, dyeing ranges, jigger machines, bleaching machines, calendar machines, mangle machines, and fabric inspection lines use bow rolls to keep fabric flat and correctly tensioned. Nonwoven production lines — where spunbond and meltblown webs are especially prone to edge curling at high output speeds — depend on expander rolls at every critical transfer point.
• Paper and Pulp: High-speed paper machines run at speeds where rubber bow rolls wear within weeks. Metal bow rolls with hard chrome surfaces run continuously on calenders, slitter rewinders, winding sections, and poop reels. Our metal expander rolls are operating in Indian and export paper mills at line speeds exceeding 600 metres per minute, with no sleeve replacement required between planned maintenance intervals.
• Tire-Cord and Technical Textiles: Tire-cord fabric is one of the most demanding web-handling applications — high tension, abrasive surface, and zero tolerance for web misalignment. Our metal banana expander rolls and slat expander rolls are built for tire-cord calenders and curing presses, where standard rubber-sleeved rolls cannot survive the operating conditions.
• Plastic Film Manufacturing: BOPP, CPP, PET, and PE film lines use banana rollers at the slitting and rewinding stages to prevent interleaving of slit lanes and keep each lane under independent, uniform tension. At film line speeds, even minor misalignment between slit lanes causes telescoping on the finished roll — eliminating that problem at source is exactly what our expander rolls are designed to do.
• Pharmaceuticals and Specialty Converting: Foil blister packaging, medical disposable nonwovens, and specialty laminates involve thin, sensitive webs that require gentle spreading without marking or stretching. Teflon-coated and silicone-sleeved wrinkle removing rolls handle these applications where conventional rubber or chrome surfaces would damage the product surface.
• Woven Sacks, Leather, Plywood, and Sheet Line Handling: Slat expander rolls are the right tool for heavier, stiffer materials that do not respond to the gentle spreading force of a rubber bow roll. Woven sack lines, artificial leather batching machines, plywood veneer lines, and sheet material handling conveyors all run slat expanders from our manufacturing range.

How to Select the Right Banana Roller or Bow Roll for Your Machine

Choosing the wrong roll type for your speed, web width, or material is one of the most common reasons bow rolls underperform. Here is a straightforward guide to matching the correct product to your application. For specific guidance, browse our applications page or contact our technical team directly.

• Web speed below 300 metres per minute: A rubber-sleeved banana roller or standard bow roll handles this range well. Choose the sleeve material — rubber, EPDM, nitrile, or silicone — based on your chemical and temperature exposure. Nitrile resists oils and solvents; silicone handles high heat; EPDM performs in wet and outdoor conditions.
• Web speed above 300 metres per minute: Use a metal expander roll with a hard chrome surface. Rubber sleeves wear rapidly at high speeds under the combination of heat, tension, and contact frequency. A larger roll diameter also reduces RPM at a given line speed, which extends bearing life further.
• Wide webs above 2500 mm: Segmented metal expander rolls distribute the spreading force more evenly across wide webs than a single-piece rubber roll can. For very wide nonwoven or paper lines, this makes a measurable difference in edge tension uniformity.
• Heavy or stiff materials — woven sacks, leather, thick film: Slat expander rolls apply a more aggressive lateral spread than a rubber bow roll. If your material does not respond to a standard bow roll at its maximum bow angle, a slat expander is the correct next step.
• Non-stick surfaces — adhesive films, heat-sensitive coatings: Teflon-sleeved wrinkle removing rolls prevent the web from sticking to the roll surface. Confirm your requirements at the inquiry stage so we can advise the right solution for your line.
• Multiple material grades on one line: A double-acting bow roll lets you reverse the bow direction, giving more adjustment range when your line processes materials that require very different bow angles. Single-acting rolls are fine for dedicated, single-material lines.
• Worn or damaged rolls already in service: Before ordering a replacement, consider our repairing and reconditioning service. We restore bow rolls and banana rollers from any manufacturer to original specification, often at lower cost and faster turnaround than a new roll. We also offer rubber roll re-coating to extend the life of existing roll sleeves without full rebuilding.

When you fill out our inquiry form, include your web width, maximum line speed, web material, and mounting type — foot or wall. That information lets us confirm the right roll specification and dimensions at the first response. Submit your requirements here.

Our Manufacturing Certifications, Awards, and Export Capability

Krishna Engineering Works holds ISO 9001:2008 certification — an independently audited quality management standard that governs how we design, manufacture, inspect, and deliver every roll we produce. Beyond certification, we have received formal recognition for manufacturing quality from both Indian and international bodies:

• 3 National Awards for Quality Manufacturing
• 2 International Awards for Quality Manufacturing
• Over 25 years of continuous production
• Active export program covering 30+ countries across 6 continents

Our production covers a wide dimensional range — rolls from small-diameter, narrow-width units for compact converting machines all the way to large-diameter rolls up to 300 mm in diameter and 8000 mm in length for wide paper or nonwoven lines. Every roll is inspected for bow geometry, runout, roundness, and bow angle accuracy before dispatch. Rubber sleeves are tested for Shore hardness uniformity and sleeve-to-segment bond strength. Metal rolls are checked for chrome layer thickness, surface finish, and balance.

For export orders, full quality documentation is included with every shipment. OEM partners receive rolls manufactured to their exact drawing specifications with traceable quality records.

We also offer reconditioning and repairing services for bow rolls and banana rollers regardless of original manufacturer — including dedicated bow roll repair, banana roller repair, and expander roll repair. Vibrating rolls, worn sleeves, seized gearboxes, and damaged shaft bows can all be restored to specification at a fraction of new-roll cost. Learn more about our quality standards and certifications.

Frequently Asked Questions About Banana Rollers and Bow Rolls

What is the difference between a banana roller and a bow roll?

A banana roller and a bow roll are the same device referred to by different names. Both describe a web-spreading roller with a bowed or curved shaft that removes wrinkles and spreads flexible web materials during continuous processing. Other common names for the same product include: expander roll, spreader roller, bowed roller, curve bar expander, wrinkle removing roll, and Mount Hope roll. The working principle is identical across all names — the bow creates differential path lengths across the web width, generating an outward lateral spreading force that flattens the web.

How does a banana roller remove wrinkles from a web?

The banana roller’s bowed shaft creates a curved surface. As the web passes over this surface, the center of the web travels a shorter path than the edges. This path-length difference exerts an outward lateral tension across the web, pulling material from the center toward the edges. The result is a flat, wrinkle-free web. The bow angle is adjusted using a worm-gear hand wheel, and the correct setting is locked once maximum wrinkle removal is achieved. No motor is required — the roll is driven entirely by the tension of the moving web. See our full wrinkle removing roll range.

What sizes are your banana rollers and bow rolls available in?

Krishna Engineering Works manufactures bow rolls and banana rollers in diameters up to 300 mm and lengths up to 8000 mm. All dimensions are made to your machine specification. Standard and custom sleeve materials are available including rubber, EPDM, silicone, nitrile, nylon, Teflon, and hard chrome-plated metal. Foot mount and wall mount brackets are supplied as standard with every roll. Send us your dimensions for a quote.

When should I use a metal bow roll instead of a rubber banana roller?

Use a metal bow roll with a hard chrome surface when your line speed exceeds 300 metres per minute, or when high web tension causes rubber sleeves to wear rapidly. Metal expander rolls are standard equipment on paper mill slitter rewinders, calenders, poop reels, and MG cylinders that operate continuously at high speed and tension. For speeds below 300 metres per minute with standard tension, a rubber-sleeved banana roller is the correct and more economical choice.

What industries use banana rollers and bow rolls?

Banana rollers are used in any industry that processes a continuous web of flexible material. Key industries include flexible packaging and converting (rotogravure, flexo printing, lamination, slitting), textile processing (stenters, dyeing ranges, calendars), paper and pulp mills, tire-cord and technical textile manufacturing, plastic film production (BOPP, CPP, PET, PE), pharmaceutical blister packaging, woven sack lines, artificial leather batching, and plywood veneer handling. See our full industry list or browse by application.

What is a slat expander roll and when is it used?

A slat expander roll uses rigid aluminum or wooden slats rather than a continuous rubber sleeve. The slat mechanism applies a more aggressive spreading force, making it suitable for slow-speed machines and heavy or stiff materials that do not respond well to a standard rubber bow roll. Common applications include coating cloth coating machines, flat bed printing machines, and artificial leather batching machines. Slat expander rolls are available in 6-inch, 8-inch, and 12-inch diameters at any working width, with plain or serrated surfaces depending on the grip requirement.

Can you repair or recondition an existing bow roll or banana roller?

Yes. Krishna Engineering Works offers full repairing and reconditioning services for bow rolls and banana rollers from any manufacturer. We offer dedicated bow roll repairing, banana roller repairing, and expander roll repairing, along with rubber roll re-coating. Reconditioning is often faster and more cost-effective than a new roll, and all repair work comes with a service warranty. Send us photos and dimensions of your worn roll to get a repair assessment.

Do you supply banana rollers for export? Which countries do you ship to?

Yes, Krishna Engineering Works exports banana rollers, bow rolls, expander rolls, and related products to over 30 countries. Regular export destinations include the USA, Canada, Brazil, Australia, Russia, France, South Africa, and Mexico, among others. All export shipments include full quality documentation. We accommodate both single replacement rolls and bulk OEM orders, with delivery timelines confirmed at the inquiry stage. Contact us with your web width, speed, and material details for a product recommendation and quotation, or reach our team directly.

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