A milk carton can contain mostly fibre.

So can a coffee cup.

An ice-cream tub may look like paper.

A food carton may carry a recycling claim.

None of that tells a paper mill whether it actually wants the material.

That distinction is becoming much more important as U.S. packaging policy moves toward extended producer responsibility.

The Poly Coated Paper Alliance has now completed its 2026 Design for Mill Recyclability Guidance, a U.S.-specific framework covering packaging including beverage cartons, cups, frozen-food and ice-cream containers, household packaging and other paper structures containing polymer coatings or additional non-fibre components.

PCPA says the guide was developed using direct input from mills representing more than 90% of consumption of the relevant recovered-paper grades used for poly-coated paper, including mixed paper, cartons and other white-fibre streams.

Rather than dividing packaging simply into “recyclable” and “not recyclable,” it uses four categories:

fully compatible,

conditionally compatible,

not compatible,

and unknown.

That sounds like another design-for-recycling framework.

But its more important contribution may be that it starts at the opposite end of the packaging value chain.

Instead of asking:

What percentage of this package is paper?

it asks:

What happens when this exact package reaches a mill?

That is a much harder—and ultimately more useful—test.

Poly-coated paper has always lived in a grey area

The function of the coating is easy to understand.

Bare fibre performs poorly against many things packaging is expected to contain.

Water.

Milk.

Juice.

Coffee.

Ice cream.

Oil.

Detergent.

Moisture.

So manufacturers add polyethylene, PLA, barrier coatings, laminates or other functional layers.

PCPA itself describes poly-coated paper as fibre packaging with a thin barrier added to one or both surfaces to provide resistance to liquids, oils or grease. Some packages can contain significantly more complex combinations, including laminates, foils and even metal components.

Those additions make the package useful.

They also create the recycling question.

The pulper wants fibre.

It does not necessarily want:

plastic film,

wet-strength chemistry,

foil,

certain adhesives,

or large quantities of coating.

That means paper content alone cannot determine whether the package is an attractive recovered-fibre feedstock.

A structure can be overwhelmingly fibre by weight while still creating excessive screening rejects or poor usable-fibre yield.

The new guide effectively asks designers to work backward from the pulper

This is what makes mill input valuable.

Packaging designers normally work forward.

What does the product need?

Which substrate provides stiffness?

Which coating provides moisture barrier?

Which adhesive survives filling?

Which ink produces the required graphics?

PCPA is encouraging another sequence.

Start with the recycling mill.

What components can the mill tolerate?

Which coating chemistries separate acceptably?

How much non-fibre material becomes reject?

Does the fibre disperse?

Does the adhesive interfere with the process?

Then work backward toward the final package.

PCPA says the guide specifically considers components including:

coatings,

adhesives,

metallization,

and other design elements that can influence mill compatibility.

That is a significant change in how recyclability is defined.

It moves the discussion away from material labels and toward process behaviour.

PCPA’s own testing shows why that distinction matters

The alliance has already published data from its wider research programme.

Using the AF&PA/FBA repulpability test protocol, PCPA tested 20 poly-coated paper packages.

The resulting usable fibre yields ranged from approximately 61% to 84%.

That is a wide range.

Every one of those packages could broadly be described as fibre-based.

Yet the amount of usable fibre recovered from them differed by more than 20 percentage points.

That is precisely why packaging composition alone is not enough.

A 61% usable-fibre yield and an 84% yield create very different economics for a mill.

Imagine 100 tonnes entering a recycling system.

At 84% yield, approximately 84 tonnes become useful fibre before considering other system losses.

At 61%, only 61 tonnes do.

The difference is 23 tonnes of material that must be separated, handled or disposed of rather than turned back into paper.

That difference matters economically.

Mill recyclability is ultimately a yield calculation

Paper recycling mills do not earn money because something has the word “paper” printed on it.

They earn money from usable recovered fibre.

The basic economic equation is straightforward.

Recovered-paper bale comes in.

The mill pays for:

the bale,

transport,

pulping,

water,

energy,

screening,

cleaning,

and handling.

It then wants as much useful fibre as possible coming out.

Everything rejected by the process still costs money.

Plastic coatings may be separated.

Foils may become rejects.

Contamination has to be removed.

Residues require handling.

The lower the fibre yield, the more expensive each tonne of useful recovered fibre effectively becomes.

This is why the 61%-84% range in PCPA’s testing is more important than a generic statement that poly-coated paper “can be recycled.”

The relevant question is:

How efficiently can this particular construction be recycled by the mill expected to receive it?

The U.S. paper industry is moving toward this same test

PCPA’s guide is not developing in isolation.

In 2025, the American Forest & Paper Association and Fibre Box Association updated their voluntary standard for coated and treated corrugated packaging.

The standard uses laboratory protocols to determine whether treated corrugated can be repulped and recycled using common mill technology.

AF&PA explicitly says the purpose is to ensure acceptable fibre yield and prevent recovered-fibre quality from creating problems during papermaking.

AF&PA has also developed broader design guidance explaining how non-fibre components such as coatings and additives can affect paper-based packaging recyclability.

The direction is consistent.

The paper industry is increasingly saying:

Do not tell us merely that the package contains fibre.

Show us what happens in the pulper.

But mill compatibility is only one part of recycling

This is where the PCPA guide also needs to be kept in perspective.

A package can perform beautifully at a paper mill and still have a low real-world recycling rate.

Because before it reaches the mill, it has to survive several other stages:

consumer participation,

collection,

MRF sorting,

bale specification,

transport,

and end-market acceptance.

PCPA’s own data demonstrate that problem.

Its RFID trials reported average sorting accuracy of approximately 74% at one Midwest MRF and 90% at a West Coast MRF.

A separate standardized sortation study reported an average capture rate of approximately 92% within the study conditions.

Those figures are encouraging.

They are also not 100%.

And controlled testing does not mean every U.S. MRF currently sorts every paper cup or carton correctly.

That means three different statements need to remain separate:

The package is compatible with recycling.

The package is collected and sorted for recycling.

The package is actually recycled at scale.

They are related.

They are not interchangeable.

California illustrates the gap particularly clearly

This is where the timing of the guide becomes interesting.

California’s SB 54 packaging EPR regulations became effective on May 1, 2026, and Circular Action Alliance submitted its initial producer responsibility program plan in June.

CAA is currently revising that plan following public consultation and says its final program plan is scheduled for submission to CalRecycle in October 2026.

So California is moving from EPR legislation toward an operating system.

And that system increasingly needs evidence about:

collection,

sorting,

reprocessing,

responsible end markets,

and real recycling rates.

This is exactly the kind of information PCPA wants its guide and testing programme to provide.

But the current California data also show how far some poly-coated formats still have to go.

California does not currently treat every fibre package as recyclable

CalRecycle’s January 2026 Covered Material Category list gives a revealing snapshot.

At that time:

aseptic cartons were not designated recyclable and had an estimated recycling rate below 1%;

gable-top cartons were also not designated recyclable and were below 1%;

and paperboard with a plastic coating or lining was not marked recyclable and had a recycling rate below 6%.

By comparison, ordinary OCC without a plastic component was classified recyclable and carried a much higher estimated recycling rate.

CalRecycle has since said it is reviewing updated collection and sorting information for non-CRV cartons and that those findings will inform the next Covered Material Categories update due by January 1, 2027.

That makes PCPA’s work especially relevant.

There is a significant difference between demonstrating that mills can use a material and demonstrating that California’s system does recycle it at sufficient scale.

The alliance is effectively trying to close that gap with evidence.

This could become one of EPR’s most important design effects

EPR changes the economics of packaging design because poor end-of-life performance no longer remains someone else’s problem.

Historically, a brand might optimize primarily for:

package price,

product protection,

appearance,

and filling-line performance.

Waste management occurred later, often under municipal control.

EPR pushes more of that end-of-life cost back toward producers.

California’s SB 54 requires producers, through the approved producer responsibility organization, to fund major portions of packaging collection, processing and recycling infrastructure. CalRecycle also requires recurring assessments of which material categories actually meet recyclability requirements.

That creates a new design question.

A coating that saves half a cent during packaging production may become expensive if it reduces fibre yield, creates difficult rejects or pushes the package into a weak recycling category.

Conversely, paying slightly more for a compatible coating could become economically attractive if it improves end-market acceptance and EPR performance.

Recyclability begins moving onto the packaging bill of materials.

But PCPA’s guide does not set California fees

This distinction is important.

The alliance says the guide can serve as a resource as CAA develops EPR strategies and fee structures.

That is plausible.

It does not mean CAA or CalRecycle has adopted the PCPA framework as a regulatory standard.

CAA’s current California plan contains separate chapters covering:

material strategy,

responsible end markets,

fee setting,

and eco-modulation.

The final plan remains under development.

PCPA itself explicitly states that its new design guide is:

not mandatory,

not a regulatory standard,

and not a guarantee of compliance.

That disclaimer is appropriate.

The guide is industry evidence.

Regulators determine legal recyclability.

Those roles should not be blurred.

The four compatibility categories may be more useful than a binary label

One of the smarter elements of the PCPA approach is avoiding a simple yes/no designation.

Packaging recycling rarely works that cleanly.

“Fully compatible” is straightforward.

“Not compatible” is also relatively clear.

But conditionally compatible may be the most valuable category.

Because paper-mill acceptance can depend on conditions.

Coating percentage.

Bale grade.

Mill equipment.

Hydrapulper configuration.

Screening capacity.

End-product quality.

Local specifications.

A package may work well in a mill designed to process carton-rich material but create too many rejects at another facility running a different furnish.

That does not mean recyclability claims should become infinitely vague.

It means designers need to understand which recycling pathway they are designing for.

The idea that every paper mill behaves identically is no more realistic than assuming every plastics recycler accepts the same polymer structures.

“Unknown” is also an important category

Sustainability marketing dislikes uncertainty.

Engineering needs it.

If a new coating has not been tested, “unknown” is more credible than assuming recyclability based on chemistry or fibre percentage.

That is especially important as paper packaging innovation accelerates.

The market is introducing:

aqueous barriers,

bio-based coatings,

heat-seal layers,

mineral coatings,

new adhesives,

metallized paper,

and hybrid fibre structures.

Some will perform well in recycling.

Some will not.

Some may work only below specific coat weights.

The responsible answer before testing is not “recyclable.”

It is:

we do not know yet.

PCPA’s inclusion of an unknown category creates room for that evidence-based approach.

The guidance could influence coating development upstream

This also creates an interesting feedback loop for chemical suppliers.

Traditionally, a barrier coating is optimized around the packaging function.

Water resistance.

Oil resistance.

Heat seal.

Oxygen barrier.

Water-vapour barrier.

Now another specification is becoming more important:

mill compatibility.

A supplier may therefore need to demonstrate not only that its coating works during packaging use, but also that it:

disperses appropriately,

does not create excessive screening rejects,

does not generate problematic stickies,

and leaves high-quality usable fibre.

That changes coating R&D.

Recyclability moves from a late-stage certification exercise into an early formulation constraint.

Adhesives may become just as important as coatings

This is another useful point in the PCPA framework.

The package’s main coating receives most of the attention.

A relatively small adhesive can still create disproportionate trouble.

Adhesives can soften during repulping.

They can fragment.

They can become stickies.

They can deposit on paper-machine fabrics, rolls or dryer surfaces downstream.

That means a component representing a very small percentage of packaging mass can have a large impact on recycling performance.

This is why recyclability cannot be calculated simply by saying:

95% fibre
5% everything else.

The chemical behavior of the 5% matters.

A package with 3% of a poorly behaving adhesive system could be more troublesome than one with a larger quantity of a material that separates cleanly.

Metallization presents a similar issue

Metallic appearance is increasingly being introduced into fibre-based packaging to replace more complex flexible structures or create premium shelf impact.

The total metal layer may be extremely thin.

By weight, it looks insignificant.

But mill compatibility depends on how it behaves during:

pulping,

screening,

and reject handling.

PCPA specifically includes metallization among the elements considered by the new guide.

This shows why “paper-based” is becoming a less useful design description.

The complete architecture matters.

Bale specifications are the missing middle of the system

There is another reason the mill perspective is useful.

Recovered-paper markets operate through grades.

A milk carton rarely travels individually from a household directly to a paper mill.

It enters a bale.

PCPA says poly-coated paper is already appearing in mixed-paper bales across states including:

California,

Colorado,

Illinois,

Maine,

Massachusetts,

Minnesota,

Ohio,

and Oregon.

Its 2026 bale audits found poly-coated paper represented approximately 1.9% by weight of mixed-paper bales in the studied material.

That may seem small.

For the mill, the concentration matters.

If poly-coated packaging forms only a small proportion of an otherwise desirable bale, a mill may tolerate it differently than if the same material becomes 15% or 20% of the furnish.

That means expanding collection can eventually change mill economics.

Something acceptable as a minor fraction of mixed paper does not automatically remain acceptable when volumes increase sharply.

Design standards therefore need to anticipate scale.

Successful EPR could actually make poor design more visible

This is an interesting paradox.

Suppose EPR succeeds.

Collection improves.

Consumers recycle more cups and cartons.

MRFs capture them more effectively.

More poly-coated paper reaches mills.

That sounds entirely positive.

But if the packages contain difficult coatings or adhesives, the paper mills will now receive more of those components as well.

An incompatibility that was barely noticeable at low collection rates can become material at high volumes.

That means collection expansion and design improvement have to happen together.

Otherwise EPR risks becoming very good at delivering unsuitable material to the end market.

PCPA’s mill-first guidance is partly an attempt to prevent that outcome.

Existing recycling pathways provide evidence—but not universal acceptance

PCPA points to several positive findings.

Some U.S. MRFs already produce:

carton bales,

cup-and-carton bales,

and mixed-paper bales

that are purchased by paper mills.

Its research argues that commercial end markets for poly-coated fibre therefore already exist.

That is useful evidence.

But PCPA’s own consumer guidance also acknowledges that not all communities currently collect poly-coated paper for recycling.

Both statements can be true.

There are functioning recycling systems.

There is not yet universal access.

That distinction should remain central to any recyclability claim.

“Recyclable at the mill” does not equal “recyclable for the consumer”

This is perhaps the simplest way to explain the problem.

Imagine a coffee cup passes a laboratory repulpability test perfectly.

A nearby paper mill would happily accept it.

But the consumer’s municipality tells residents to put cups in the trash.

The package is technically mill-compatible.

It is not practically recyclable for that consumer through the available system.

Now reverse the scenario.

The municipality collects cups.

The MRF sorts them into mixed paper.

But the receiving mill cannot tolerate the coating.

Collection exists.

A viable end market does not.

True recycling requires all of these pieces to align.

That is why California’s SB 54 assessments examine systems rather than simply materials.

The guide could make brand-owner conversations more difficult—in a useful way

Brands like easy answers.

Is it recyclable?

Yes or no?

PCPA’s framework makes the conversation more nuanced.

Which coating?

Which adhesive?

Which mill?

Which bale?

Which fibre yield?

Under what conditions?

That may feel less convenient.

It is also closer to industrial reality.

A sustainability team may discover that changing from one polymer coating to another does not meaningfully affect product performance but substantially improves mill compatibility.

A converter may discover that reducing coating weight moves a structure from conditional compatibility toward full compatibility.

An adhesive change may solve a stickies problem.

Those are actionable design changes.

“Make it more recyclable” is not.

The guide may also expose where fibre packaging should not be forced

This is equally important.

Not every package needs to become paper.

Some products require so much:

moisture protection,

gas barrier,

sealability,

chemical resistance,

or durability

that achieving those functions on paper may require a complex structure.

At some point the additional polymer, foil or coating can erode the recycling advantage that motivated the fibre substitution in the first place.

A mill-based compatibility guide can help identify that point.

If the package requires so much non-fibre functionality that it becomes a poor paper-mill feedstock, another material architecture may be more appropriate.

That is a much more mature approach than treating increased paper content as an environmental objective by itself.

The PCPA data also show why testing needs to continue

Twenty tested packages are useful.

They are not the entire market.

Poly-coated packaging contains an enormous variety of:

substrates,

coating types,

coat weights,

adhesives,

inks,

laminations,

closures,

and product residues.

The guide itself recognizes this by including an unknown category and by stating that it will evolve as additional mill feedback and testing become available.

That is appropriate.

Recyclability guidance should not become frozen while packaging chemistry continues to change.

AF&PA says the same about its own voluntary coated-corrugated standard: the guidance represents a snapshot in time and is not intended as a mandatory industry standard.

The most credible recyclability systems should be capable of changing when the evidence changes.

There is one transparency limitation

The full PCPA guide is not yet public.

The alliance currently provides a public summary, while the detailed guidance is restricted to members, advisors and partners.

PCPA says it intends to release the full document publicly after further industry engagement.

That is understandable during framework development.

But if the guide is ultimately intended to influence broad packaging design, EPR discussions or regulatory thinking, public access will become important.

Brands outside the alliance need to see the criteria.

Coating suppliers need to understand them.

Recyclers need to scrutinize them.

Independent technical experts need to challenge them.

A widely accepted design standard gains credibility through transparency.

So the public release may ultimately matter almost as much as completion of the guide itself.

California could become the test of whether industry guidance changes real recycling

This is where the story becomes more consequential.

California is already measuring recycling rates by covered material category.

Its January 2026 list showed low rates for several poly-coated fibre formats.

CAA is building an EPR programme covering:

collection,

processing,

end markets,

fee-setting,

eco-modulation,

and source reduction.

PCPA now has:

mill input,

repulpability testing,

MRF sorting data,

bale audits,

and design guidance.

The next question is whether those pieces change the actual numbers.

Do more communities collect the material?

Does MRF capture improve?

Do more mills accept it?

Does fibre yield increase as packaging design changes?

Do California’s reported recycling rates move materially higher?

That will be the real test.

The strongest evidence will not be another recyclability logo

It will be tonnes.

Tonnes collected.

Tonnes sorted.

Tonnes accepted by mills.

Tonnes of usable fibre recovered.

Tonnes converted into new paper products.

This is why the PCPA guide matters.

It moves the industry one step away from defining recyclability primarily through packaging composition.

A paper cup is not recyclable because it looks like paper.

A carton is not circular because most of its weight is fibre.

And a polymer coating is not automatically a problem simply because it is plastic.

The useful question is what the entire structure does inside the real recycling system.

Can it be collected?

Can it be sorted?

Will a mill buy it?

How much fibre can that mill recover?

If the industry can answer all four, recyclability becomes something more useful than a claim.

It becomes a material pathway.

The paper industry is effectively moving recyclability downstream

That may be the larger shift.

For years, packaging development began with the product and ended with the recycling symbol.

The new logic works in reverse.

Start at the paper mill.

Understand the fibre it wants.

Understand what the pulper rejects.

Design the coatings and adhesives accordingly.

Then build the package.

EPR gives brands a financial reason to do it.

Mill economics give recyclers a practical reason.

And guides such as PCPA’s can provide the technical language connecting the two.

The significance of the 2026 Design for Mill Recyclability Guidance is therefore not that it declares poly-coated paper recyclable.

PCPA itself does not claim that every structure is universally compatible.

Its value is almost the opposite.

It acknowledges that small design choices can determine whether the package becomes useful fibre or mill reject.

That is a much higher standard than saying a package is paper-based.

It is also where paper-packaging circularity increasingly needs to go.

Last Updated on 17/09/2026 by Jota Machinery