Spreader Rolls – Manufacturing & Refurbishment

New spreader rolls, maintenance, modernization and lifecycle services for paper, board and pulp machines

Spreader rolls play an important role in controlling webs and fabrics throughout paper, board and pulp production. Their function is to spread the moving material in the cross-machine direction, helping to prevent wrinkles, control tension and maintain stable web or fabric handling.

The performance of a spreader roll depends on more than the bow alone. Roll diameter, bow geometry, contact angle, incoming and outgoing web geometry, shell material, surface properties and the speed relationship between the roll and moving web all influence the spreading effect. This is also reflected directly in PR Rolls' original engineering material.

PR Rolls manufactures new spreader rolls and provides complete maintenance, refurbishment and modernization services for existing rolls.

Our capabilities cover the complete spreader roll lifecycle:

New roll → Application engineering → Manufacturing → Surface solution → Balancing → Installation → Condition monitoring → Maintenance → Modernization → Continued production

Whether the requirement is a new roll or restoration of an existing one, the objective is the same: reliable spreading performance matched to the actual machine position and operating conditions.

What Does a Spreader Roll Do?

Control the web – not simply rotate with it

A bowed spreader roll creates a controlled spreading effect across the moving web, felt or fabric.

Correct spreading can help:

• Prevent wrinkles and creases
• Maintain a stable web
• Improve cross-machine web control
• Spread felts and fabrics
• Control tension distribution
• Separate slit webs in winding applications
• Support reliable operation at demanding machine positions

The spreading effect is created by the interaction between the roll and the material passing over it.

Important parameters include:

Bow + Roll diameter + Contact angle + Web path + Surface + Speed relationship

This is why selecting a spreader roll should begin with the application rather than simply replacing an existing roll with an identical component.

Competitor documentation supports the same basic application principle: Valmet describes spreader rolls as controlling wrinkles and tension profiles, while ANDRITZ identifies web smoothing, widening, slit separation and web control as primary functions.

New Spreader Roll Manufacturing

Engineered for the actual application

PR Rolls manufactures new bowed spreader rolls for paper, board and pulp applications.

Each application can place different demands on the roll.

A spreader roll operating in a wet section faces different conditions from one operating in a dry, high-temperature position or at a winder.

PR Rolls therefore evaluates operating parameters such as:

• Machine position
• Material being spread
• Roll speed
• Web speed
• Operating temperature
• Moisture conditions
• Chemicals and contaminants
• Contact angle
• Incoming and outgoing web geometry
• Required spreading effect
• Available installation space
• Surface and coating requirements

The original PR Rolls specification material similarly considers operating conditions, web temperature, moisture, speed, chemicals, contact angle, incoming and outgoing distances and material to be spread when defining a roll.

The objective is not simply to manufacture a roll that fits the machine – but to engineer a spreader roll that fits the process.

Fixed or Adjustable Bow Spreader Rolls

PR Rolls can manufacture bowed spreader rolls with either fixed or adjustable bow, depending on the application.

Fixed Bow
A fixed bow provides a defined spreading geometry designed for a known operating condition.

It can be suitable where the machine position, web path and production conditions remain relatively consistent.

Adjustable Bow
An adjustable bow allows the spreading geometry to be adapted when operating requirements change.

This can be valuable where different products, web conditions or production parameters require greater flexibility.

The appropriate solution should therefore be determined according to the actual process rather than assuming that one bow configuration is optimal for every application.

Steel or Rubber Spreader Rolls

Select the construction according to operating conditions
PR Rolls can provide spreader rolls with steel or rubber shell constructions.

The original PR Rolls engineering material specifies both alternatives, including several surface, material and coating configurations.

Steel Spreader Rolls
Steel constructions can provide a robust platform for demanding applications and allow the functional surface to be engineered through material selection, machining, grooving and coating.

Depending on the application, PR Rolls can provide:

• Smooth surfaces
• Grooved surfaces
• Different steel materials
• Functional coatings
• Application-specific surface finishing

Rubber Spreader Rolls

Rubber-covered constructions remain relevant for applications where the operating environment or required web interaction makes a resilient surface advantageous.

Available construction and material alternatives are selected according to temperature, moisture, speed, web properties and other operating requirements.

The choice between steel and rubber should therefore be based on the machine position and process requirements – not simply on the construction previously installed.

Spreader Roll Surface Engineering

The surface is part of the spreading system
The mechanical construction of the spreader roll determines only part of its performance.

The surface determines how the roll interacts with the web, felt or fabric.

Depending on the application, surface requirements can include:

• Wear resistance
• Corrosion resistance
• Release properties
• Controlled friction
• Resistance to contamination
• Chemical resistance
• Temperature resistance
• Appropriate interaction with the moving web or fabric

PR Rolls combines spreader roll manufacturing with its own coating and surface engineering expertise.

This makes it possible to consider the functional surface already during roll design rather than treating coating as a separate aftermarket operation.

Roll construction + Bow geometry + Surface properties + Operating conditions = Functional spreading solution

Grooved Spreader Rolls

Surface geometry can also influence spreading performance.

Depending on the application, steel shells can be supplied with a smooth or grooved surface. PR Rolls' technical material specifically identifies both alternatives.

Groove geometry should be selected according to the roll position, web or fabric and operating conditions.

Rather than treating grooving as an isolated feature, PR Rolls considers it as part of the complete interaction between:

Roll geometry → Surface → Web → Speed → Contact angle

Bearings, Sealing & Internal Construction

Reliable spreading depends on what is inside the roll
A spreader roll consists of multiple rotating elements operating around a bowed shaft.

The condition of bearings, couplings, seals and internal components therefore directly influences how freely and reliably the roll rotates.

PR Rolls can provide different bearing and lubrication arrangements according to the operating environment.

The original PR Rolls design documentation includes permanently lubricated bearings as well as configurations allowing future lubrication, together with ceramic or coated groove ball bearing alternatives.

Sealing is particularly important in operating environments where moisture, contaminants or process chemicals can reach internal components.

The objective is a construction that supports:

Low rotational resistance + Reliable sealing + Controlled lubrication + Stable operation

Spreader Roll Drives & Auxiliary Equipment

Depending on machine position and operating requirements, spreader rolls can also require auxiliary equipment.

PR Rolls solutions can include:

• Drive arrangements
• Drive pulleys
• Rope pulleys
• Rotating brackets
• Application-specific end constructions
• Monitoring equipment

PR Rolls has also developed integrated-drive solutions where the motor is incorporated into the end segment. The original design concept was intended to provide controlled roll speed while reducing the need for external belt-drive arrangements.

The appropriate drive concept depends on the roll position, required speed relationship and available machine space.

Spreader Roll Refurbishment & Maintenance

Restore the complete roll – not only individual components

A spreader roll is a mechanical system consisting of many interacting components.

Bearing wear, damaged seals, worn couplings, surface deterioration or incorrect bow condition can gradually affect its operation.

PR Rolls provides complete spreader roll maintenance and refurbishment.

Depending on condition, service can include:

• Roll disassembly and inspection
• Renewal of bearings
• Renewal of seals
• Renewal of couplings
• Inspection of bow geometry
• Bow correction where required
• Maintenance of supports
• Renewal of damaged components
• Surface restoration
• Coating of segments
• Balancing
• Reassembly
• Test running
• Vibration measurement

These operations are directly represented in PR Rolls' existing maintenance and modernization material.

The objective is not simply to replace worn bearings.

The objective is to restore the mechanical condition and spreading performance of the complete roll.

Spreader Roll Modernization

Upgrade an existing roll instead of automatically replacing it
An existing spreader roll may still provide a suitable mechanical foundation even when individual components or aspects of its design have become outdated.

In these cases, modernization can provide an alternative to purchasing a completely new roll.

Depending on the existing construction and operating requirements, modernization can include:

• Bearing and sealing upgrades
• New couplings
• Bow inspection and correction
• Improved end sealing
• Replacement of damaged components
• Segment restoration
• New functional coating
• Balancing
• Drive modifications
• Monitoring solutions

PR Rolls' historical offering explicitly separates service from modernization, including bow correction, coupling replacement, sealing changes, balancing and coating.

This gives customers three possible lifecycle paths:

Maintain → Restore → Continue production

Modernize → Improve → Continue production

or

Replace → New PR Rolls spreader roll → Production

Maintenance of Spreader Rolls from Different Manufacturers

Existing rolls can be evaluated based on condition and application
Industrial mills often operate spreader rolls from several manufacturers and generations.

PR Rolls' refurbishment approach is therefore based on the actual roll construction, condition and operating requirements, rather than treating maintenance solely as support for newly manufactured PR Rolls rolls.

An existing spreader roll can be inspected to determine which components can be retained, which should be renewed and whether modifications could improve future operation.

Spreader Roll Balancing & Testing

Verify the roll before it returns to production
Correct balancing becomes increasingly important as roll speed increases.

PR Rolls can incorporate balancing into both new-roll manufacturing and refurbishment.

For refurbished spreader rolls, the service process can also include test running and vibration measurements before the roll returns to production. This testing step is explicitly included in your existing service documentation.

This allows the completed roll to be evaluated as an assembled rotating component rather than relying only on the condition of individual parts.

Spreader Roll Condition Monitoring

Identify developing problems before failure
PR Rolls can also support condition monitoring of spreader rolls in operation.

Depending on the application, measurements can include:

• Shell temperature
• Temperature differences across the roll
• Vibration
• Bearing condition
• Speed differences between the roll shell and moving web

These are the parameters identified in PR Rolls' original on-site monitoring concept.

Monitoring can help identify abnormal operating conditions and provide information for planning future maintenance.

This extends the offering beyond:

Manufacture → Repair

towards:

Manufacture → Monitor → Maintain → Modernize → Extend lifecycle

Spreader Rolls for Different Machine Positions

Spreader roll requirements change significantly according to where the roll operates.

PR Rolls can engineer and refurbish spreader rolls for applications involving:

Wet End
Felt and wire applications can expose the roll to moisture, contamination and demanding sealing conditions.

Press and Dryer Sections
Operating temperature, moisture, web interaction and surface requirements become increasingly important.

Coating & Finishing
Surface properties, temperature resistance and accurate web control can become dominant design factors.

Calenders
Stable web handling and appropriate roll speed are important for reliable operation.

Reels & Winders
Spreader rolls can help control wrinkles and separate slit webs before winding.

Pulp Drying
Spreader rolls can also be engineered for web and fabric handling in pulp drying applications.

This application-based structure also matches how the current market searches for these solutions: Finbow divides its offering between wet-end, dry-end, pulp-drying, supercalender and winder applications, while Valmet describes applications throughout paper and board machines.

Fly Rolls

Controlled web spreading for demanding applications
PR Rolls also manufactures and services fly rolls.

The existing PR Rolls material describes fly rolls with different lubrication arrangements, several coating possibilities and operating designs for demanding paper-machine applications.

The design focuses on easy rotation and controlled interaction between roll and web.

Depending on the application, important objectives include:

• Low rotational resistance
• Low power demand
• Controlled speed difference
• Effective spreading
• Low heat generation
• Reliable sealing
• Long operating life

PR Rolls can combine fly roll manufacturing with surface engineering, balancing and future maintenance.

New Roll or Refurbishment?

When an existing spreader roll begins to cause problems, replacement is not automatically the only solution.

PR Rolls can evaluate the roll and operating requirements to determine the appropriate lifecycle strategy:

Existing roll in suitable condition → Maintenance

Existing roll suitable for improvement → Modernization

Existing roll no longer technically appropriate → New spreader roll

Because PR Rolls provides both new manufacturing and refurbishment, the decision can be based on the technical requirements of the application rather than being limited to one service route.

Complete Spreader Roll Lifecycle Services

PR Rolls combines capabilities that are often considered separately:

Application engineering + Manufacturing + Mechanical expertise + Surface engineering + Coating + Balancing + Testing + Condition monitoring + Refurbishment

This makes it possible to support the spreader roll throughout its operating lifecycle.

New roll → Production → Monitoring → Maintenance → Modernization → Continued production

And when continued refurbishment is no longer appropriate:

Condition assessment → New PR Rolls spreader roll → Production

The objective is to maintain reliable spreading performance, stable operation and long-term serviceability throughout the roll lifecycle.

Frequently Asked Questions About Spreader Rolls

What is a spreader roll?
A spreader roll is used to spread a moving web, felt or fabric in the cross-machine direction. In paper and board machines it can help prevent wrinkles, control web or fabric tension and improve web handling.

Does PR Rolls manufacture new spreader rolls?
Yes. PR Rolls manufactures new bowed spreader rolls engineered according to the machine position, operating conditions and required spreading performance.

Does PR Rolls manufacture both fixed and adjustable bow spreader rolls?
Yes. PR Rolls' spreader roll designs can be provided with fixed or adjustable bow depending on application requirements.

Can PR Rolls manufacture steel and rubber spreader rolls?
Yes. PR Rolls' spreader roll offering includes both steel-shell and rubber-shell constructions.

Can existing spreader rolls be refurbished?
Yes. Depending on roll condition, refurbishment can include bearings, seals, couplings, supports, damaged components, bow correction, segment coating, balancing, test running and vibration measurement.

Can an old spreader roll be modernized?
Yes. Where the basic roll remains suitable, modernization can provide an alternative to complete replacement. The appropriate modifications depend on the existing construction and future operating requirements.

Can PR Rolls service spreader rolls from other manufacturers?
PR Rolls can evaluate existing spreader rolls according to their construction and condition. [I would confirm internally that you want to make an explicit “all brands” claim before publishing this FAQ.]

What determines the spreading effect?
Important factors include shaft bow, roll diameter, contact angle, shell material, the material being spread, incoming and outgoing web geometry and the speed relationship between the roll and web.

Can PR Rolls monitor spreader rolls on-site?
Yes. PR Rolls' monitoring capabilities can include temperature, vibration, bearing-condition and roll-to-web speed measurements.

Does PR Rolls balance spreader rolls?
Yes. Balancing can be incorporated into both new-roll manufacturing and refurbishment, together with test running and vibration measurement where applicable.

New, Refurbished or Modernized – One Spreader Roll Partner

A spreader roll should be engineered and maintained as a complete functional system.

PR Rolls combines new spreader roll manufacturing, mechanical refurbishment, modernization, surface engineering, coating, balancing, testing and condition monitoring.

Whether the requirement is a completely new roll or an existing roll that needs another production cycle, the starting point is the same:

Understand the application → Evaluate the operating conditions → Select the appropriate solution

Contact PR Rolls to discuss a new spreader roll, refurbishment or modernization for your paper, board or pulp machine.