For years, corrugated printing could be discussed largely in terms of familiar pressroom variables.

Color.

Speed.

Drying.

Registration.

Ink mileage.

Rub resistance.

Those requirements have not disappeared.

But they are no longer enough.

A modern corrugated converter can now be asked whether an ink contains renewable feedstock, whether a coating affects repulpability, whether a formulation works with high-speed digital printheads, whether an adhesive can survive converting without complicating recycling, and whether the finished package satisfies increasingly detailed customer compliance requirements.

That makes the chemistry surrounding the corrugated sheet far more important than it once appeared.

INX International’s planned portfolio at TAPPI CorrExpo in Fort Worth reflects that shift.

The company will bring natural-based aqueous inks, coatings, adhesives and digital inkjet formulations to booth 708 during the September 28–30 event. TAPPI says Corrugated Week 2026 is expected to bring together more than 1,100 corrugated professionals in Fort Worth.

It would be easy to read the announcement as a supplier bringing a larger product catalogue to a trade show.

The more consequential development is what that catalogue says about the box plant.

Corrugated printing is increasingly becoming a systems-engineering problem in which ink chemistry has to work with the press, substrate, coating, curing method, recycling system and customer’s sustainability requirements at the same time.

That is a much higher bar than simply putting good color onto linerboard.

Renewable content solves one problem, not every problem

One of the technologies INX plans to emphasize is its INXhrc natural-based ink platform.

According to INX, the aqueous formulations can contain up to 90% bio-renewable resin content and have a carbon footprint around 25% to 30% below conventional aqueous inks, based on the company’s product data.

That makes the technology interesting as converters and brand owners try to reduce fossil-derived inputs.

But renewable content needs to be interpreted carefully.

An ink derived partly from renewable feedstocks is not automatically:

more recyclable,

easier to remove during repulping,

lower impact in every application,

or preferable regardless of press performance.

Those are separate questions.

This distinction is becoming increasingly important across sustainable packaging.

A renewable resin answers a feedstock question.

Repulpability answers an end-of-life question.

Press speed and drying answer a manufacturing question.

Food-packaging or chemical requirements answer a compliance question.

A single environmental attribute cannot stand in for all four.

That is why INX’s emphasis on press performance alongside renewable content is more commercially relevant than the “natural-based” label by itself.

A box plant will not tolerate persistent foam, unstable viscosity, poor transfer or slower production simply because the formulation contains more renewable material.

Sustainable chemistry still has to behave like industrial chemistry.

Corrugated has one major sustainability advantage worth protecting

This matters particularly in corrugated because the base package already has a strong recycling pathway.

Old corrugated containers are an established secondary raw material for paper mills.

The Fibre Box Association describes recovered OCC as a valuable fibre resource that is collected, repulped and returned to new corrugated products.

That creates an important design principle.

The objective should not merely be to make inks and coatings themselves sound more sustainable.

It should be to avoid damaging the recycling value that the corrugated substrate already possesses.

The Fibre Box Association’s own guidance for its Corrugated Recycles symbol makes that point clearly.

The symbol is intended for corrugated products that remain readily recyclable, and the association cautions against its use on structures coated or treated with substances that are not repulpable or have limited repulpability.

That means every added function deserves scrutiny.

Water resistance.

Grease resistance.

Gloss.

Barrier performance.

Scuff resistance.

Heat sealing.

High-impact graphics.

Each can add commercial value.

Each can also introduce material that has to pass through the recovered-paper mill later.

The coating may matter more than the box designer expects

This is why INX’s decision to bring coatings and adhesives alongside inks is particularly relevant.

Corrugated packaging is expanding into applications that require more performance from the board.

Produce.

Seafood.

Meat.

E-commerce.

Retail-ready packaging.

High-quality consumer graphics.

Those applications can demand coatings that improve moisture resistance, abrasion performance, appearance or converting behavior.

But the more sophisticated the surface treatment becomes, the more important repulpability becomes.

In 2025, the American Forest & Paper Association and Fibre Box Association updated their voluntary standard specifically for coated and treated corrugated material entering the OCC recycling stream.

The test protocol evaluates whether treated corrugated can be repulped using common mill technology and whether the recovered fibre remains suitable for papermaking.

The standard goes further than asking whether the substrate is technically paper.

It looks at what happens after the treated board enters a pulper.

That is an important change in mindset.

A corrugated package does not remain recyclable merely because most of its mass is fibre.

The coating system has to be considered as part of the package.

AF&PA similarly warns that non-fibre components such as coatings and additives can create recycling challenges for paper mills.

For converters, that means coating selection increasingly belongs in the same conversation as board grade and flute profile.

Water-based does not automatically mean recycling-neutral

The same caution applies to aqueous technology.

Water-based inks have a long history in corrugated flexographic printing, and for good reason.

They are well suited to absorbent paper substrates and avoid some of the solvent-management issues associated with other printing processes.

But the term “water-based” describes the liquid delivery system.

It does not mean that everything in the ink disappears into water when the box reaches a recycling mill.

Pigments.

Binders.

Resins.

Additives.

Defoamers.

Other functional ingredients.

All remain relevant.

That does not mean conventional corrugated printing inks make boxes unrecyclable. Printed corrugated is routinely recovered successfully.

It means sustainability discussions should focus on the finished package and mill process, not simply the carrier used to deliver the ink.

The same principle applies to natural-based formulations.

A converter evaluating a lower-carbon ink should ask:

How much renewable content is actually present?

What is the basis of the carbon comparison?

How does the formulation perform on press?

Does it affect drying?

Does it change wash-up or waste?

And does the complete printed construction remain compatible with the targeted recycling system?

Those questions are less marketable than “eco-friendly ink.”

They are also much more useful.

Digital corrugated changes the chemistry problem again

INX’s CorrExpo portfolio also includes its BECB-06 UV-curable inkjet system for corrugated board, display media and other applications.

The formulation is optimized for Epson S3200 printheads and includes CMYK with orange and violet options.

The interesting part is not simply that it is digital.

It is how different digital ink chemistry is from buying a conventional flexographic ink.

Inkjet requires a much tighter relationship among:

viscosity,

surface tension,

printhead architecture,

jetting stability,

fluid delivery,

substrate interaction,

curing,

and production environment.

An ink can produce excellent color in a laboratory and still perform poorly in a production press if those variables are not aligned.

This explains one of the more important statements in INX’s CorrExpo material: digital inks have to be developed as part of the complete production environment, rather than treated as an interchangeable consumable.

That idea deserves more attention.

In analog corrugated printing, a converter may reasonably think of ink as something supplied to the press.

In industrial inkjet, the ink increasingly behaves like one component inside the printing machine’s engineering architecture.

Digital’s advantage is increasingly operational

Digital corrugated printing is often promoted through personalization.

That is certainly one application.

But the stronger manufacturing argument may be inventory flexibility.

Conventional printing works extremely well at scale.

Once tooling, plates and setup are justified, long runs can be highly productive.

Digital removes much of that fixed artwork preparation.

That changes the economics of:

shorter runs,

regional versions,

multiple languages,

seasonal designs,

rapid product changes,

and variable information.

The real value is not that every corrugated box suddenly needs to be personalized.

It is that converters can economically produce more versions without treating every version as a traditional long-run print job.

This matters because packaging portfolios are becoming more fragmented.

Brands carry more SKUs.

Promotional cycles are shorter.

E-commerce creates additional packaging variants.

Regulatory information changes.

Retail customers request different graphics.

The cost of complexity therefore moves from the graphic designer into the plant.

Digital printing is one method of managing that complexity.

But again, ink chemistry determines whether the theoretical flexibility becomes reliable production.

Digital and flexo are solving different economic problems

This is also why digital corrugated printing should not be presented as the inevitable replacement for flexography.

Flexo remains exceptionally effective at producing very large volumes at high speeds.

Digital becomes particularly attractive when the cost of plates, setup, changeover and inventory begins to outweigh the benefits of long-run production.

A modern corrugated operation may therefore require both.

High-volume work through flexo.

High-mix or short-run work through digital.

That makes ink suppliers increasingly responsible for supporting more than one print architecture inside the same converting business.

INX’s CorrExpo portfolio reflects that reality by putting aqueous systems and high-performance inkjet products in the same conversation.

This is less about one technology winning.

It is about matching production method to order structure.

Coatings and adhesives are becoming part of print strategy

Another change is that printing can no longer be isolated from downstream converting.

A coating affects friction.

It can affect gluing.

It may change drying.

It can influence abrasion.

It may affect whether cartons stack cleanly.

It can alter the appearance of an ink.

An adhesive can determine box-forming reliability.

A high-performance surface may help during distribution but complicate repulping.

These interactions explain why INX has introduced a 32-page coatings and adhesives catalogue organized around application, performance, production and sustainability requirements.

The catalogue itself is not the story.

The fact that such a decision tool is necessary is.

The chemistry stack around a corrugated package is getting more complicated.

Converters increasingly need to understand not only:

What does this coating do?

but:

What does this coating do to everything else?

That is systems engineering.

Sustainability may eventually reward simpler chemistry

The logical conclusion is not that corrugated packaging needs more sophisticated chemistry everywhere.

It may be the opposite.

As customers ask for more information about recyclability and carbon, the strongest packaging designs may become those that use only the chemistry necessary to perform the job.

A moisture barrier where moisture resistance is required.

A high-performance coating where abrasion demands it.

A specialty adhesive where ordinary adhesive cannot work.

Additional treatment everywhere else becomes harder to justify if it adds cost, material or recycling complexity without delivering useful function.

This mirrors a wider movement in packaging design.

For flexible packaging, companies are trying to reduce unnecessary laminate complexity.

For plastic containers, designers are reducing incompatible components.

For paper packaging, the same principle should apply to coatings, treatments and adhesives.

Corrugated’s sustainability advantage begins with recoverable fibre.

The smartest chemistry is chemistry that adds the necessary function while preserving as much of that advantage as possible.

Carbon-footprint claims will also need stronger documentation

INX’s renewable-content platform illustrates another direction the market is taking.

The company says INXhrc reduces carbon footprint by around 25% to 30% versus standard aqueous inks and can contain up to 90% renewable resin content.

Those are meaningful claims if the underlying comparison is applicable to a converter’s actual product.

But buyers will increasingly need to ask what exactly is being compared.

Per kilogram of ink?

Per printed area?

At equivalent color density?

Which conventional formulation is the baseline?

Does different ink mileage change the result?

Are production and upstream raw materials included?

This is not unique to INX.

The entire packaging supply chain is moving toward more specific environmental data.

A lower-carbon raw material is useful.

A documented lower-carbon raw material is more useful.

And a lower-carbon raw material that still performs correctly on the press is what the converter can actually commercialize.

Regulatory support is becoming part of the ink supplier’s job

INX also emphasizes technical and regulatory support alongside its products.

That may sound like ordinary supplier service.

It is becoming strategically more important.

Converters increasingly receive questions from brand owners about:

restricted substances,

food-packaging applications,

PFAS,

heavy metals,

migration,

renewable content,

carbon data,

and recyclability.

The box plant does not necessarily manufacture the chemistry responsible for those characteristics.

It still has to answer for the finished package.

That pushes documentation requirements backward through the supply chain.

The converter asks the ink maker.

The ink maker asks pigment, resin and additive suppliers.

The brand owner eventually expects evidence.

This is one reason sustainability and compliance cannot remain separate from procurement.

The lowest-price ink is not necessarily the lowest-cost choice if it creates extra qualification work or cannot provide documentation a major customer requires.

The next competitive advantage may be qualification speed

That same logic applies even more strongly to digital inkjet.

A converter adopting a digital platform has to qualify the interaction among printhead, ink, substrate and curing system.

If every new application requires a long troubleshooting cycle, the theoretical flexibility of digital printing loses some of its value.

This makes qualification speed commercially important.

An ink system that jets reliably, adheres properly and already has a well-understood curing window allows the converter to move more quickly from test work into paid production.

INX explicitly positions its digital inks around reducing development risk and moving applications from qualification into commercial production more efficiently.

That is a more interesting metric than color gamut alone.

The packaging industry increasingly rewards technologies that shorten the distance between an idea and a stable production order.

CorrExpo is really showing how the box plant is changing

Trade-show announcements naturally emphasize products.

Ink.

Coating.

Adhesive.

Digital formulation.

But viewed together, INX’s CorrExpo portfolio says something broader about the corrugated plant.

The box plant used to be able to optimize several functions relatively independently.

Board.

Printing.

Gluing.

Diecutting.

Shipping.

Those boundaries are becoming less clear.

A coating decision can affect recycling.

An ink decision can affect carbon reporting.

A digital-print decision can affect inventory strategy.

An adhesive decision can affect production efficiency and downstream fibre recovery.

A customer’s regulatory requirement can reach all the way back to raw-material chemistry.

That means technical decisions that once sat with the pressroom increasingly involve sustainability, compliance, procurement and product development teams.

The ink room is becoming connected to the packaging specification.

That may be the more important transformation.

Corrugated does not need greener-sounding chemistry. It needs chemistry that proves its value.

There is no shortage of sustainability terminology in packaging.

Natural.

Renewable.

Bio-based.

Water-based.

Recyclable.

Low-carbon.

Each can describe something useful.

None should be allowed to substitute for performance evidence.

For a corrugated converter, the useful questions are more practical.

Does the ink reduce fossil-derived content?

Does it maintain press speed?

Does the coating deliver the barrier required?

Does the package remain repulpable?

Does the digital ink jet reliably?

Can the supplier document compliance?

Can the system reduce waste or shorten qualification?

And does the finished box still meet the customer’s cost target?

That is the standard technologies displayed at CorrExpo increasingly have to meet.

INX’s portfolio is significant not because it provides one answer to all of those questions.

It shows how many of those questions now converge around the same package.

The next stage of corrugated printing will therefore not be determined only by who can put the best image onto brown or white liner.

It will be determined by who can manage print quality, production reliability, chemistry, compliance and fibre recovery as one system.

That is why the next constraint in corrugated printing may not be press speed.

It may be everything contained in the ink, coating and adhesive that has to keep up with it.

Last Updated on 15/09/2026 by Jota Machinery