TecnoGuide – Corrosion, Wear & Chemical Resistant Coatings

Protective coatings for guide rolls and demanding industrial environments

Corrosion, wear, humidity, chemicals and contamination can significantly shorten the service life of rolls and other critical industrial components.

In paper and board machines, these conditions are particularly demanding. Guide rolls operate continuously in contact with wires, felts or dryer fabrics while being exposed to moisture, heat, chemicals, dirt and process contaminants.

TecnoGuide is PR Rolls' range of corrosion-, wear- and chemical-resistant protective coatings for guide rolls and other industrial components operating in demanding environments.

The TecnoGuide range includes solutions for applications from wet wire guide rolls and press felt guide rolls to dryer fabric guide rolls and paper lead rolls, as well as corrosion protection for other exposed machine and process components.

Depending on temperature, contamination and operating conditions, PR Rolls can provide TecnoGuide or TecnoGuide HT to create a durable functional surface designed around the application.

What Problems Does TecnoGuide Solve?

The operating environment around a paper machine can be highly aggressive towards unprotected metal surfaces.

TecnoGuide is designed to address several common surface-related problems:

• Corrosion and rust
• Mechanical wear
• High humidity
• Chemical attack
• Dirt and contamination
• Stickies
• High operating temperatures
• Poor coating adhesion or bonding
• Premature deterioration of roll surfaces
• Frequent surface maintenance

Instead of repeatedly repairing the symptoms of surface deterioration, TecnoGuide creates a protective functional barrier between the underlying component and its operating environment.

TecnoGuide for Paper Machine Guide Rolls

Protect the roll and the fabric running over it

Guide rolls are one of the primary applications for TecnoGuide.

The coating range is suitable for:

• Wet wire guide rolls
• Press felt guide rolls
• Dryer fabric guide rolls
• Paper lead rolls

TecnoGuide HT can additionally be used for paper lead rolls.

Although guide rolls may appear to be relatively simple machine components, their surface condition can directly affect the wires, felts and fabrics running over them.

A corroded, worn or contaminated roll surface can become rough or irregular, potentially increasing mechanical interaction with the fabric.

Maintaining a clean and consistent roll surface is therefore important for both roll lifetime and fabric performance.

TecnoGuide for Wet Wire Guide Rolls

Wet-end environments expose equipment to continuous moisture, process water and chemicals.

This combination can create particularly demanding conditions for unprotected roll surfaces.

Corrosion can gradually create:

• Pitting
• Rough surfaces
• Unevenness
• Rust formation
• Increased maintenance requirements

TecnoGuide creates a protective surface designed to resist corrosion, chemicals and mechanical wear.

This makes it particularly suitable for wet wire guide rolls operating in continuously humid environments.

The objective is to protect the underlying roll while maintaining a durable surface for reliable wire contact.

TecnoGuide for Press Felt Guide Rolls

Press felt guide rolls operate in an environment combining moisture, contamination, mechanical contact and process chemicals.

The condition of the roll surface is particularly important because the press felt continuously interacts with it during production.

A deteriorated surface can potentially contribute to unnecessary felt wear or contamination.

TecnoGuide provides a combination of:

Corrosion resistance + Wear resistance + Chemical resistance + Good friction

These characteristics make it well suited for protecting press felt guide rolls in demanding paper and board machine environments.

TecnoGuide for Dryer Fabric Guide Rolls

Dryer fabric guide rolls face another demanding combination of operating conditions.

In addition to continuous fabric contact, these rolls can be exposed to:

• Heat
• Humidity
• Dirt
• Fibres and process contamination
• Wear
• Corrosion

TecnoGuide provides protective properties for appropriate dryer-section applications within its specified operating temperature range.

For more demanding temperatures and contamination conditions, TecnoGuide HT provides the higher-temperature alternative.

This makes it possible to select the coating according to the actual position and operating environment rather than using one coating specification throughout the machine.

TecnoGuide HT – For Higher Temperatures and Demanding Paper Machine Conditions

Extended protection where standard coating conditions are not enough

TecnoGuide HT extends the TecnoGuide concept to more demanding paper machine environments.

According to PR Rolls' technical material, TecnoGuide HT is suitable for:

• Wet wire guide rolls
• Press felt guide rolls
• Dryer fabric guide rolls
• Paper lead rolls

The main operating challenges identified for these applications are corrosion, wear, dirt and stickies.

The HT version combines good non-stick and abrasive properties with excellent corrosion, wear and chemical resistance.

Most importantly, TecnoGuide HT is designed for operating temperatures of up to 160°C, broadening the range of applications compared with standard TecnoGuide.

Reduce Dirt and Stickies

Corrosion is not the only problem affecting paper machine roll surfaces.

Fibres, dirt, process residues and sticky contaminants can accumulate on rolls during operation.

This can make surfaces more difficult to maintain and create undesirable interaction between the roll and fabric.

TecnoGuide HT combines protective properties with good non-stick characteristics, helping reduce the tendency of contaminants and stickies to adhere to the surface.

This combination is particularly useful because the surface must perform several functions simultaneously:

Protect against corrosion → Resist wear → Resist chemicals → Reduce contamination

See also TecnoClean, TecnoClean CeraHybrid and TecnoDiamond

Protect Felts, Wires and Dryer Fabrics

Guide roll coating should not be evaluated only in terms of protecting the steel roll.

The material running over the roll can be considerably more important to the production process.

A corroded or damaged surface can create an undesirable contact interface for:

• Forming wires
• Press felts
• Dryer fabrics

Maintaining a consistent protective surface can help reduce the risk of damage associated with rough or deteriorated roll surfaces.

The objective of TecnoGuide is therefore twofold:

protect the underlying roll and maintain a suitable functional surface for the fabric running over it.

Excellent Corrosion Resistance

Corrosion protection is at the heart of the TecnoGuide product family.

Paper and board machines contain many environments where moisture, chemicals and temperature can accelerate corrosion of exposed steel surfaces.

Once corrosion starts, the surface can become progressively more difficult to maintain.

TecnoGuide creates a protective barrier designed to isolate the underlying component from the operating environment.

Both TecnoGuide and TecnoGuide HT provide excellent corrosion resistance, according to PR Rolls' technical specifications.

This makes the coatings relevant not only for restoring existing components but also for protecting surfaces before significant corrosion damage occurs.

Chemical Resistance for Demanding Process Environments

Paper, pulp and other process industries use chemicals across many stages of production.

Surfaces located in these environments therefore require protection capable of withstanding more than water and humidity.

TecnoGuide provides excellent chemical resistance, with the standard version specified for a pH range of 3–13.

This broadens its relevance beyond guide rolls to other industrial components exposed to chemically demanding conditions.

Actual coating suitability should always be evaluated according to the specific chemical, concentration, temperature and exposure conditions.

Wear Resistance for Long-Term Surface Protection

A corrosion-resistant coating is only useful if it remains intact during operation.

Guide rolls experience continuous mechanical contact, while other coated machine components can be exposed to abrasion, cleaning and maintenance.

TecnoGuide therefore combines corrosion protection with good wear resistance.

TecnoGuide HT also provides good abrasive properties for more demanding applications.

This combination helps protect the underlying component over longer operating periods.

Excellent Bonding for Reliable Protection

Protective coatings must remain securely bonded to the underlying component.

If the coating loses adhesion, the protective barrier is compromised and corrosion can begin underneath the damaged area.

PR Rolls therefore identifies excellent bonding as one of the important benefits of TecnoGuide.

The combination of correct surface preparation and coating adhesion is particularly important in applications exposed to:

• Humidity
• Temperature variations
• Mechanical wear
• Chemicals
• Continuous machine operation

Reliable bonding helps the coating remain an effective protective layer throughout its service life.

Good Friction for Guide Roll Applications

TecnoGuide combines its protective properties with good friction characteristics.

For guide roll applications, this provides a functional surface for interaction with wires, felts and fabrics.

However, TecnoGuide should not be confused with TecnoGrip.

TecnoGuide is primarily a corrosion-, wear- and chemical-protection coating.

TecnoGrip is specifically engineered as a traction and anti-slip coating where controlled friction is the primary surface requirement.

This distinction allows PR Rolls to select the coating according to the dominant process problem.

TecnoGuide for Roll Shafts, Roll Ends and Machine Frames

One of the important insights from PR Rolls' technical material is that TecnoGuide is not limited to the functional surface of guide rolls.

Corrosion can also attack surrounding machine components.

TecnoGuide can be used for corrosion protection of:

• Paper machine frames
• Roll shafts
• Roll ends

These areas can be continuously exposed to moisture and process conditions even though they are not directly involved in paper production.

Protecting them can help reduce rust formation and deterioration while extending the lifetime of existing equipment.

TecnoGuide as an Alternative to Rubber Coatings

Rubber coatings are widely used to protect industrial rolls and components, but they are not always the optimal solution for applications involving chemicals, corrosion and demanding wear conditions.

PR Rolls positions TecnoGuide as offering a competitive price level compared with rubber, while providing excellent corrosion and chemical resistance, good wear resistance and good friction characteristics.

For TecnoGuide HT, PR Rolls similarly highlights a strong price/quality ratio.

The choice between TecnoGuide, rubber and other coating technologies should always be based on the actual operating conditions and required surface properties.

TecnoGuide vs. TecnoGuide HT

The PDF makes this distinction particularly important, and I would definitely include the following table on the page:

More Than a Coating – Selecting the Right Surface for the Application
PR Rolls' coating portfolio is built around different operating problems.

This is important because there is no single coating that is optimal for every roll position.

For TecnoGuide, the dominant question is:

How do we protect the component against its operating environment while maintaining the functional surface required by the process?

Restore and Protect Existing Components

Corrosion or surface deterioration does not necessarily mean that the complete component needs to be replaced.

Where the underlying component remains mechanically suitable, surface restoration and protective coating can provide an alternative.

Depending on the component and its condition, PR Rolls can combine TecnoGuide with its wider expertise in:

• Inspection and measurement
• On-site machining
• Grinding
• Surface preparation
• Coating
• Final verification

The objective is to address the condition of the underlying component before creating the new protective surface.

This is consistent with PR Rolls' broader approach of restoring and upgrading critical industrial components instead of automatically replacing them.

When Should You Consider TecnoGuide?

TecnoGuide or TecnoGuide HT should be considered when the operating environment is causing repeated surface problems.

Typical indicators include:

• Guide rolls suffer from corrosion
• High humidity causes repeated rust formation
• Wet wire guide rolls deteriorate prematurely
• Press felt guide rolls experience wear or corrosion
• Dryer fabric guide rolls require improved protection
• Dirt or stickies accumulate on roll surfaces
• Chemical attack damages exposed components
• Roll ends or shafts suffer from corrosion
• Machine frames require corrosion protection
• Pump components or housings deteriorate
• Higher operating temperatures require more robust protection
• Existing rubber solutions provide insufficient lifecycle performance

PR Rolls can evaluate the application and determine whether TecnoGuide or TecnoGuide HT provides the more appropriate surface properties.

Why Choose PR Rolls for TecnoGuide?

The most effective coating solution starts with understanding why the existing surface is failing.

PR Rolls combines paper-machine expertise with experience in on-site machining, grinding and industrial coating.

This makes it possible to consider factors such as:

• Component function
• Corrosion mechanism
• Chemical exposure
• Temperature
• Humidity
• Mechanical wear
• Contamination
• Fabric interaction
• Existing surface condition
• Required service lifetime

The objective is not simply to coat a component.

It is to provide the right functional surface for its actual operating environment.

Frequently Asked Questions About TecnoGuide

What is TecnoGuide?
TecnoGuide is PR Rolls' range of corrosion-, wear- and chemical-resistant protective coatings. Its primary applications include wet wire, press felt and dryer fabric guide rolls, but the technology can also protect other industrial components exposed to corrosive environments.

What is the difference between TecnoGuide and TecnoGuide HT?
TecnoGuide is specified for temperatures between 20–100°C, while TecnoGuide HT is designed for applications up to 160°C. The HT version also provides excellent wear resistance and good abrasive properties and can be used for paper lead rolls in addition to guide-roll applications.

Where can TecnoGuide be used in a paper machine?
Typical applications include wet wire guide rolls, press felt guide rolls and dryer fabric guide rolls. TecnoGuide can also protect paper machine frames, roll shafts and roll ends.

Can TecnoGuide HT be used for paper lead rolls?
Yes. Paper lead rolls are specifically identified as a TecnoGuide HT application in PR Rolls' technical material.

Does TecnoGuide protect against chemicals?
Yes. Excellent chemical resistance is one of the key properties of both TecnoGuide and TecnoGuide HT. Standard TecnoGuide is specified for a pH range of 3–13.

Does TecnoGuide have non-stick properties?
Yes. Standard TecnoGuide provides good non-stick and release characteristics, while TecnoGuide HT also provides good non-stick properties for applications affected by dirt and stickies.

Can TecnoGuide be used outside guide rolls?
Yes. PR Rolls' technical material identifies applications including paper machine frames, roll shafts and ends, pump wheels and housings, chimneys and tanks, as well as other components operating in corrosive environments.

How thick is TecnoGuide?
Standard TecnoGuide has a specified coating thickness of 300–400 µm. TecnoGuide HT has a specified thickness of 300–500 µm.

How long does TecnoGuide HT last?
PR Rolls' technical material states an expected lifetime of more than five years under normal paper machine working conditions. Actual service life will depend on operating conditions and application.

Protect Critical Surfaces Against Corrosion, Wear and Chemicals

Corrosion problems should not automatically lead to component replacement.

TecnoGuide and TecnoGuide HT provide durable protective surfaces for paper machine guide rolls and other industrial equipment exposed to moisture, wear, chemicals, dirt and demanding operating conditions.

From wet wire and press felt guide rolls to dryer fabric guide rolls, paper lead rolls, roll ends, machine frames, pumps, housings and tanks, the TecnoGuide range allows PR Rolls to select the appropriate protective surface according to the application.

For higher-temperature and particularly demanding paper-machine positions, TecnoGuide HT extends the solution up to 160°C and offers an expected service lifetime exceeding five years under normal paper-machine working conditions.

The result is a surface-engineering approach focused on protecting existing equipment, extending component lifetime and maintaining reliable operating conditions.