On-site Grinding Services for the Pulp & Paper Industry

Precision grinding of rolls, cylinders and large process equipment directly at your mill

PR Rolls provides specialised on-site grinding services for the pulp and paper industry, restoring the geometry, surface condition and performance of rolls, cylinders, drums and other large process equipment directly at the mill.

Our grinding expertise covers equipment throughout both pulp production and paper manufacturing – from debarking drums, filters, kilns and pulp drying equipment to paper machine rolls and dryer cylinders.

Continuous production, mechanical wear, corrosion, doctoring, deposits and demanding process conditions can gradually affect the geometry and surface condition of critical equipment. Left untreated, these deviations can contribute to vibration, reduced runnability, increased component wear, process disturbances and unplanned shutdowns.

PR Rolls performs precision grinding during planned shutdowns and maintenance projects, helping pulp and paper mills restore critical components without unnecessary dismantling or transportation.

Our grinding services can also be combined with measurement, on-site machining, coating and field balancing, providing an integrated solution for restoring equipment performance.

On-site Grinding for Pulp and Paper Mills

PR Rolls specialises in precision grinding and surface restoration of large components used throughout pulp and paper production.

Typical applications include:

Pulp Industry

Debarking drums
Pulp dryer rolls
Drying cylinders
Filters and filter drums
Kilns
Large process drums
Suction and vacuum rolls
Guide rolls
Other large rotating process equipment

Paper Industry

Dryer cylinders
Press rolls
Suction rolls
Vacuum rolls
Guide rolls
Felt rolls
Reel drums
Pope reels
Calender rolls
MG cylinders
Yankee cylinders
Other large rolls and cylinders

Our portable grinding equipment enables many large components to be restored directly at the customer's site, reducing dismantling, transportation and maintenance lead time.

What is On-site Grinding?

On-site grinding is a precision maintenance process used to restore the geometry and surface condition of large industrial components directly at the mill.

Portable grinding equipment is installed at or around the component, allowing grinding to be performed without transporting the equipment to an external workshop.

Depending on the application, on-site grinding can correct:

Surface wear
Grooves and scratches
Corrosion and pitting
Diameter variations
Out-of-round conditions
Profile deviations
Uneven wear
Surface roughness
Local surface damage

The objective is not simply to create a smoother surface. Precision grinding restores the functional geometry and surface condition required for reliable operation.

Why Precision Grinding Matters

Large rotating components in pulp and paper production operate continuously under demanding mechanical, thermal and chemical conditions.

Wear develops gradually and may not initially be visible as a production problem. As deviations increase, however, they can affect both the component itself and surrounding equipment.

Depending on the application, poor surface condition or geometry may contribute to:

Increased vibration
Mechanical wear
Bearing loads
Web breaks
Poor machine runnability
Reduced drying performance
Poor doctoring
Process instability
Product quality variations
Higher maintenance costs
Unplanned production interruptions

Precision grinding restores worn surfaces and can significantly extend the useful service life of existing equipment.

Grinding Services for the Pulp Industry

PR Rolls provides specialised on-site grinding for large equipment used throughout the pulp production process.

Large pulp mill components can be particularly difficult and expensive to dismantle and transport. Performing grinding directly at the mill therefore offers significant advantages during planned maintenance shutdowns.

Debarking Drum Grinding

Debarking drums are exposed to continuous mechanical wear, impact, moisture and abrasive material.

Over time, critical running and support surfaces can develop wear and geometry deviations that affect drum operation.

PR Rolls provides on-site grinding for debarking drums, restoring worn surfaces and geometry directly at the mill.

Depending on the equipment condition, the work can include:

Condition inspection
Geometry measurements
Runout measurement
Grinding of running surfaces
Grinding of support surfaces
Surface restoration
Final measurement and verification

On-site grinding reduces the need to dismantle or transport these very large components and allows restoration to be integrated into the mill's planned shutdown.

Kiln Grinding

PR Rolls provides on-site grinding services for large rotating kilns used in pulp mill processes.

Kilns operate under demanding thermal and mechanical conditions, making accurate geometry of rotating and supporting surfaces important for reliable operation.

Wear or surface deviations can increase mechanical loads and vibration and contribute to premature wear of surrounding components.

PR Rolls can inspect, measure and grind critical kiln surfaces directly at the mill to restore geometry and improve operating conditions.

Grinding can also be combined with on-site machining and measurement where required.

Filter and Filter Drum Grinding

Filters and large rotating filter drums are another important application for precision on-site grinding in pulp mills.

Wear, corrosion and mechanical damage can affect critical sealing, running or contact surfaces over time.

PR Rolls provides grinding and surface restoration of filter components to restore the required:

Geometry
Roundness
Surface condition
Contact surfaces
Dimensional accuracy

Where required, grinding can be followed by coating or other surface restoration processes to improve corrosion or wear resistance.

Grinding for Pulp Drying Lines

PR Rolls provides on-site roll grinding for pulp drying lines, where accurate roll geometry and surface condition are essential for stable production.

Worn or damaged rolls can contribute to vibration, web instability and reduced production reliability.

Precision grinding can restore:

Roll profile
Roundness
Surface geometry
Surface condition
Required surface finish

Maintaining these properties helps support stable pulp dryer operation while extending component service life.

On-site Grinding of Paper Machine Dryer Cylinders

Dryer cylinder grinding is one of the most important applications for on-site grinding in paper production.

Over time, dryer cylinder surfaces can develop:

Doctor blade grooves
Scratches
Corrosion
Pitting
Deposits
Uneven wear
Profile deviations
Excessive runout

These conditions can affect web behaviour, heat transfer, moisture profiles, doctoring and overall dryer section runnability.

PR Rolls performs on-site dryer cylinder grinding to restore the required surface condition and geometry without removing the cylinders from the machine.

Complete Dryer Section Grinding

The condition of an individual dryer cylinder should not always be evaluated in isolation.

Differences in diameter and geometry between cylinders can affect the performance of the complete dryer section.

PR Rolls can measure and evaluate multiple cylinders before defining the required grinding scope.

A typical dryer section grinding project may include:

Initial cylinder inspection
Diameter and geometry measurements
Evaluation of cylinder condition
Definition of target dimensions
Grinding of selected cylinders
Surface finishing
Final measurement and verification

This systematic approach allows grinding decisions to be based on the condition of the complete dryer section.

Grinding of Paper Machine Rolls

PR Rolls provides on-site grinding for a wide range of rolls used throughout paper production.

Vacuum Rolls
Grinding can restore worn surfaces and correct geometry deviations affecting roll performance.

Guide and Felt Rolls
Accurate roll geometry supports stable web and fabric travel while reducing unnecessary vibration and wear.

Reel Drums and Pope Reels
Grinding restores worn surfaces and helps maintain reliable operation in the reel section.

Precision Measurement Before Grinding

Accurate grinding begins with accurate measurement.

Before grinding, PR Rolls can measure the actual condition of the component to determine the required maintenance scope.

Measurements may include:

Diameter
Roundness
Runout
Surface profile
Geometry
Wear patterns
Surface condition

Measurement data allows the grinding process to target the actual deviations while minimising unnecessary material removal.

For large process equipment such as debarking drums, filters and kilns, measurement is particularly important because grinding needs to restore the correct geometry in relation to the component's supporting structures.

Grinding Before Coating

Grinding and coating are often complementary processes.

When a roll, cylinder, drum or other process surface is worn, corroded or damaged, PR Rolls can first restore its geometry through precision grinding before applying a new functional coating.

A complete surface restoration project can include:

Condition measurement
Surface inspection
Precision grinding
Surface preparation
Coating
Finishing
Final measurement and verification

Combining grinding and coating allows both geometry and functional surface properties to be restored within the same maintenance project.

Depending on the application, coatings can provide improved:

Wear resistance
Corrosion protection
Release properties
Surface durability
Equipment lifetime

Superfinishing

Selected pulp and paper applications require an exceptionally fine surface finish after grinding.

PR Rolls provides superfinishing where low surface roughness and high surface quality are required.

The process can be used for selected rolls and cylinders where the final surface finish has a direct impact on equipment or production performance.

The required surface finish is defined according to the component, process position and operating requirements.

Grinding and Field Balancing

Surface geometry and rotational performance are closely connected.

Where required, PR Rolls can combine on-site grinding with field balancing to address both surface condition and rotational behaviour during the same maintenance project.

This is particularly valuable for large rotating equipment where out-of-round conditions, surface wear and imbalance may contribute to vibration.

Combining measurement, grinding and field balancing provides a more comprehensive approach to restoring equipment performance.

Grinding During Planned Shutdowns

Pulp and paper mill shutdowns are tightly scheduled.

PR Rolls plans grinding projects around the available maintenance window and performs the work directly at the mill.

Benefits of on-site grinding include:

Reduced dismantling
No unnecessary transportation
Shorter maintenance lead times
Reduced handling of large components
Multiple components serviced during the same shutdown
Coordination with other maintenance activities
Faster return to production

This is particularly important for large pulp mill equipment such as debarking drums, kilns and filters, where transporting components to an external workshop may be impractical.

Our On-site Grinding Process

1. Inspection
The component, surface condition and operating requirements are evaluated.

2. Precision Measurement
Geometry, diameter, runout, profile and wear are measured where required.

3. Grinding Plan
Target dimensions and the required grinding scope are defined from the measurement results.

4. Equipment Installation
Portable grinding equipment is installed and accurately aligned at the mill.

5. Precision Grinding
The component is progressively ground while geometry and material removal are carefully controlled.

6. Surface Finishing
The required final surface condition is produced.

7. Verification
Final measurements verify the achieved geometry and surface quality.

8. Additional Surface Treatment
Where required, coating, field balancing or on-site machining can follow the grinding process.

Complete On-site Surface Restoration

One of PR Rolls' key strengths is our ability to combine several specialised maintenance processes within the same project.

Our services include:

Precision measurement
On-site grinding
Superfinishing
On-site machining
Thermal spray coating
Field balancing
Final verification

This allows pulp and paper mills to work with one experienced service partner for the complete restoration process.

Instead of treating wear, geometry, surface damage, corrosion and vibration as separate issues, PR Rolls can evaluate the complete condition of the equipment and recommend the appropriate combination of maintenance actions.

Benefits of PR Rolls On-site Grinding

Professional on-site grinding can help pulp and paper mills achieve:

Restored component geometry
Improved surface condition
Reduced vibration
Improved machine and process reliability
Improved paper machine runnability
Fewer production disturbances
Longer component lifetime
Reduced maintenance costs
Less need for component replacement
More predictable shutdowns

The exact benefits depend on the equipment, its condition and its position in the production process.

Why Choose PR Rolls?

PR Rolls combines specialised pulp and paper industry expertise with precision on-site grinding technology.

Our customers benefit from:

Experience throughout pulp and paper production
Specialised on-site grinding equipment
Experience with very large rotating components
Dryer cylinder and paper machine roll expertise
Pulp drying line expertise
Debarking drum grinding
Kiln grinding
Filter and filter drum grinding
Precision measurement before and after grinding
Grinding and coating from the same service partner
On-site machining capability
Field balancing capability
Efficient shutdown execution

Our objective is not simply to grind a surface.

We restore the geometry, surface condition and functional performance required for reliable pulp and paper production.

Frequently Asked Questions

What is on-site grinding?
On-site grinding is the precision restoration of rolls, cylinders, drums and other large equipment directly at a pulp or paper mill using portable grinding equipment. It reduces the need for dismantling and transportation to an external workshop.

What equipment can PR Rolls grind in a pulp mill?
PR Rolls provides on-site grinding for equipment including debarking drums, pulp dryer rolls, filters, filter drums, kilns, large process drums and other rotating components.

What paper machine components can PR Rolls grind?
Typical applications include dryer cylinders, press rolls, suction rolls, vacuum rolls, guide rolls, felt rolls, calender rolls, reel drums and other large rolls and cylinders.

Does PR Rolls grind debarking drums?
Yes. PR Rolls provides on-site grinding and geometry restoration for debarking drums and their critical running and support surfaces.

Does PR Rolls provide kiln grinding?
Yes. PR Rolls can inspect, measure and grind critical surfaces on large rotating kilns directly at the mill.

Can PR Rolls grind filters?
Yes. Grinding and surface restoration can be performed on large filters and filter drums where wear, corrosion or geometry deviations affect critical surfaces.

Why do dryer cylinders need grinding?
Dryer cylinders can develop grooves, scratches, corrosion, deposits and geometry deviations during operation. Grinding restores surface condition and geometry and can contribute to improved dryer section performance.

Can grinding be combined with coating?
Yes. PR Rolls can combine measurement, grinding, surface preparation, coating and finishing within the same on-site maintenance project.

Can grinding reduce vibration?
Correcting out-of-round conditions and geometry deviations can contribute to lower vibration. If imbalance is also present, PR Rolls can combine grinding with field balancing.

Why should equipment be measured before grinding?
Measurement identifies the actual geometry and wear condition of the component. This allows PR Rolls to define the correct grinding scope and minimise unnecessary material removal.

Restore Critical Equipment Directly at Your Mill

Large pulp and paper mill components do not always need to be transported to a workshop or replaced when surfaces become worn.

PR Rolls combines on-site grinding, precision measurement, coating, machining and field balancing to restore critical equipment directly at the mill.

From debarking drums, kilns and filters in pulp production to pulp dryer rolls, paper machine rolls and dryer cylinders, our goal is to help pulp and paper producers improve reliability, extend equipment lifetime and maximise production availability.