DS Smith is taking two very different actions in the UK at almost the same time.

In Cornwall, the company has confirmed the closure of its Launceston corrugated box plant, with production scheduled to finish in November 2026 and 165 jobs affected.

In Kent, meanwhile, it is proposing to close PM4 at Kemsley Paper Mill while investing £20 million in PM6 to modernise the machine, broaden its product capability and increase production volumes.

Viewed separately, one story is a plant closure and the other is a paper-machine investment.

Viewed together, they point toward something more significant.

DS Smith is continuing to reshape where it wants capacity—and which assets it wants that capacity to sit on.

That makes the current UK changes less about a simple reduction in tonnes and more about the concentration of production into selected converting plants and paper machines.

Launceston Closure Is Now Confirmed

The Launceston decision has moved beyond proposal.

DS Smith began consulting with employees earlier in 2026 and has now confirmed that production will stop in November, following what the company described as careful consideration of counter-proposals submitted during the consultation.

The closure will eliminate 165 roles.

The plant has operated in Launceston for more than five decades and has been one of the town’s significant industrial employers. Local reporting says the facility processes around 28,000 tonnes of paper annually.

Workers and their families had protested against the proposed closure in June, emphasizing the impact on the local community.

DS Smith says it will support employees through the closure process.

For the Cornwall operation, however, the commercial decision is now clear.

The more important industry question is:

Where will the packaging volume currently handled at Launceston go?

DS Smith has not publicly provided a detailed customer-by-customer transfer plan.

But when a corrugated group closes a converting site rather than withdrawing from the market entirely, production is often redistributed through the remaining network where geography, machine capability and transport economics allow.

That is where network optimisation becomes more complicated than simply removing one factory from a map.

Corrugated Plants Are Local Businesses Even Inside Global Groups

Corrugated packaging has an unusual industrial geography.

Boxes are bulky relative to their value.

Transporting empty corrugated cases over long distances can quickly erode manufacturing economics.

That means converting plants are normally positioned relatively close to customers and regional demand.

Closing a plant can therefore reduce fixed costs and eliminate duplicated capacity.

But it can also increase:

delivery distances;

freight cost;

vehicle movements;

lead times;

and reliance on another facility.

This is why a plant closure that looks efficient from a corporate-capacity perspective still has to work at the delivered-cost level.

The relevant calculation is not simply:

How much production capacity can we close?

It is:

Can the remaining network manufacture and deliver the same customer mix more efficiently after the closure?

That question will determine whether the Launceston decision produces a lasting structural saving or merely moves cost into logistics and surrounding plants.

Launceston Is Part of a Wider UK Footprint Review

The Cornwall closure also does not stand alone.

Following International Paper’s acquisition of DS Smith in early 2025, the combined group carried out a strategic review of its UK packaging operation.

In May 2025 it proposed the closure of five UK packaging sites as part of an effort to reduce complexity, improve efficiency and respond to difficult trading conditions.

The affected locations included the Clay Cross box plant and sheet plants in Plymouth, Newcastle, Sheerness and Wellingborough, alongside changes at several other operations.

DS Smith Packaging’s statutory accounts later described the review as identifying opportunities to:

reduce complexity;

increase agility;

and streamline the company’s footprint.

That language is useful when interpreting the 2026 decisions.

The current Launceston closure is therefore better seen as part of an ongoing manufacturing-network reshaping rather than an isolated local event.

But that does not prove the closure was caused by International Paper’s acquisition.

Customer demand, site economics, equipment utilisation, freight patterns and wider market conditions can all influence an individual closure.

Without a company breakdown of the economics, attributing the Launceston decision to the acquisition alone would go beyond the evidence.

Kemsley Tells the Other Half of the Story

If Launceston shows where DS Smith is prepared to remove capacity, Kemsley shows where it is still prepared to invest.

The company has proposed a £20 million modernisation of PM6, alongside the closure of PM4.

DS Smith says the investment would enable PM6 to produce new paper grades at increased volumes, while helping Kemsley remain competitive and better aligned with customer requirements.

This is not simply a maintenance project.

It suggests that DS Smith wants a different future product mix from the mill.

That distinction matters.

Paper-machine rationalisation often involves more than shutting an old machine because demand has disappeared.

A producer may choose to transfer part of the commercial role of an older machine onto another machine capable of making:

more competitive grades;

lighter basis weights;

larger volumes;

or a broader product range.

In that scenario, the important metric is not the number of machines operating.

It is the tonnage, cost and grade mix that remain after the restructuring.

PM4 and PM6 Are Not Identical Assets

DS Smith’s current published Kemsley data shows important differences between the machines.

PM4 has listed production capacity of about 250,000 tonnes per year, with a basis-weight range of approximately 125–210 g/m² and a maximum speed of 770 m/min.

PM6 has current published capacity of about 290,000 tonnes per year, operating approximately 85–130 g/m², with a maximum speed of 1,100 m/min.

PM6 was acquired and rebuilt in 2008 specifically for lightweight corrugated case material.

That history makes the current £20 million proposal particularly interesting.

DS Smith is not simply maintaining PM6.

It intends to extend its capabilities.

But the company has not yet identified the specific new grades PM6 would produce.

Therefore, it would be premature to assume that every PM4 grade will simply transfer directly onto PM6.

Machine width, forming configuration, basis-weight capability, drying capacity, strength targets and customer specifications all affect which products can move between machines.

The investment proposal appears designed to increase PM6’s flexibility.

The exact future production map has not yet been disclosed.

Do Not Subtract 250,000 Tonnes Yet

Kemsley’s current stated total annual production capacity is around 830,000 tonnes, spread across PM3, PM4 and PM6.

On paper, shutting a machine rated at 250,000 tonnes per year could appear to imply a huge reduction.

That calculation would be misleading at this stage.

DS Smith specifically says the £20 million PM6 project would increase production volumes.

It has not disclosed by how much.

We therefore do not yet know:

how much PM4 volume disappears;

how much migrates to PM6;

how much additional PM6 capacity the rebuild creates;

or whether some grades are transferred to PM3 or other mills.

This is an important distinction for recycled containerboard buyers.

Machine closure does not necessarily equal equivalent market-capacity removal.

The net tonnage effect can only be calculated once the company publishes the post-investment capacities and grade plan.

Kemsley Has Already Been Receiving Major Capital

The £20 million proposal also follows a much larger investment already underway at the mill.

In 2024, DS Smith announced £48 million for a new fibre-preparation line at Kemsley.

That project was designed to supply PM3 with improved recycled-fibre furnish while increasing fibre recovery, reducing contaminants and improving resource efficiency.

DS Smith said the new preparation system would help avoid more than 6,000 tonnes of CO₂ annually, reduce freshwater consumption by more than 50,000 cubic metres per year and cut waste by around 39,000 tonnes.

By August 2025, construction of the new fibre-preparation building had reached a major milestone, with installation of process and electrical equipment moving forward.

Put the two projects together and the pattern becomes clearer.

£48 million toward PM3’s fibre supply system.

Another proposed £20 million toward PM6.

PM4 proposed for closure.

That looks less like withdrawal from Kemsley and more like capital concentration around selected production assets.

Capital Is Moving Toward the Machines That Remain

This is a familiar industrial pattern.

Operating three machines does not automatically create more value than operating two.

An older or less competitive machine can carry:

higher maintenance costs;

more downtime;

greater energy consumption;

lower production speed;

higher labour intensity;

or a product range that overlaps with other assets.

Closing that machine can improve the economics of the surviving operation if volume can be absorbed elsewhere at lower cost.

But the opposite is also possible.

Remove too much capacity and fixed costs become concentrated over fewer tonnes.

Customer flexibility can decline.

Maintenance outages become more difficult because there is less backup capacity.

The strategic question therefore becomes:

Can PM3 and an expanded PM6 produce the right combination of grades at sufficiently high utilisation to improve Kemsley’s overall economics?

That is likely to be more important than the number of paper machines remaining on site.

Kemsley Is Too Important to Treat as a Simple Capacity-Cut Story

Kemsley is not a marginal operation in the UK recovered-paper system.

DS Smith describes it as the largest recycled-paper mill in the UK and the second-largest in Europe.

The mill uses recovered fibre to manufacture corrugated case materials and specialty papers, with the majority ultimately used for board and box production.

DS Smith previously said the site could recycle up to one million tonnes of paper and card annually through its fibre system.

That creates an important upstream consequence.

Kemsley’s machine configuration does not only affect containerboard supply.

It affects demand for recovered paper.

If the final restructuring changes Kemsley’s overall production volume or furnish mix, recovered-paper merchants and municipal recycling systems could eventually feel the impact.

Again, the direction cannot yet be quantified.

A PM4 closure could reduce recovered-fibre demand.

An expanded PM6 could offset part of that reduction.

Improved fibre yield from the new F-line could also change the relationship between recovered paper input and finished paper output.

The sector needs the final operating configuration before drawing conclusions.

Machine Modernisation Can Be About Product Mix as Much as Cost

The wording around PM6 is particularly notable because DS Smith says the investment would allow it to produce new paper grades.

That suggests the company is responding not only to production cost but also to what its packaging network and external customers are expected to buy.

Containerboard markets have changed materially over the past decade.

Converters increasingly seek papers that can deliver required box performance at lower grammage.

Lightweighting can reduce fibre consumption and transport weight, provided strength and runnability remain adequate.

At the same time, e-commerce, shelf-ready packaging and automated packing lines can create different performance requirements around compression, surface, converting speed and consistency.

PM6 already operates in lighter basis weights than PM4 according to DS Smith’s published ranges.

It is therefore reasonable to see lightweight paper capability as part of the machine’s existing role.

It would not, however, be justified to claim that lightweighting is the reason PM4 is being closed unless DS Smith says so.

The company’s stated reasons remain competitiveness, evolving market conditions and the need to supply the right products.

Paper Integration Changes How the Decision Should Be Read

DS Smith is both a paper producer and a corrugated packaging manufacturer.

That vertical integration matters.

A standalone paper mill evaluates markets primarily through paper sales.

An integrated packaging group can also evaluate paper machines according to what its own box plants require.

Kemsley’s output feeds packaging operations across Europe.

So a machine investment can potentially be justified by more than spot-market paper economics.

It can support:

internal board supply;

grade consistency;

fibre integration;

security of supply;

and packaging-product development.

Likewise, closing converting sites can change where internal paper volumes are consumed.

This makes the simultaneous paper and box-plant restructuring worth watching together.

The network is not composed of independent factories.

It is a connected fibre-to-box system.

The International Paper Context Cannot Be Ignored

There is also a larger corporate backdrop.

International Paper completed its acquisition of DS Smith on January 31, 2025.

A year later, in January 2026, IP announced plans to separate its North American and EMEA businesses into two independent publicly traded companies.

The future EMEA company is expected to include both legacy DS Smith and legacy International Paper assets in Europe, the Middle East and Africa.

The UK restructuring is therefore taking place while the combined European business is itself being prepared for another corporate transition.

It would be speculative to say that the Launceston and Kemsley decisions were made specifically because of that planned separation.

But the timing is strategically relevant.

The EMEA business is entering that future structure while simultaneously reviewing:

which converting plants remain;

which machines receive capital;

which sites are consolidated;

and where future production capability is concentrated.

Those decisions will shape the cost base and asset portfolio inherited by the future European company.

Closure and Investment Can Happen at the Same Time

The Launceston and Kemsley announcements may appear contradictory.

Why remove capacity while investing money elsewhere?

Because industrial restructuring is rarely simply expansion or contraction.

Companies routinely close assets they consider less competitive while increasing investment in assets they intend to retain.

That process can produce fewer sites but more productive remaining sites.

It can also concentrate capital into machines with:

higher output;

better grade flexibility;

lower operating cost;

or stronger strategic location.

The current DS Smith developments therefore fit a broader distinction that paper and packaging markets need to make:

capacity reduction is not the same as investment withdrawal.

At Launceston, capital is leaving an operation entirely.

At Kemsley, DS Smith is proposing to remove one machine while committing new capital to another.

Those are very different signals.

The Human Impact Is Equally Uneven

Industrial logic does not remove the employment consequences.

Launceston’s 165 affected jobs are tied to a town where the packaging plant has operated for almost 60 years.

The impact is therefore more concentrated than the job number alone suggests.

Kemsley employees face a different situation.

The proposed PM4 closure would reduce the number of roles required at the mill, but DS Smith has not yet disclosed the number of potential redundancies.

Consultation with employees and union representatives remains underway.

This distinction must remain clear:

Launceston closure: confirmed.

Kemsley PM4 closure: proposed and under consultation.

Combining the two under a headline saying DS Smith “closes Launceston and PM4” would therefore overstate the current status at Kemsley.

What Should Corrugated Buyers Watch?

Customers should watch more than whether individual plants close.

The practical issues are:

where their products will be converted;

whether transport distances change;

whether lead times remain stable;

which box plants absorb transferred volume;

and whether the network retains enough surge capacity during seasonal peaks.

For paper buyers, the relevant questions are different.

Watch:

PM6’s eventual new grade range;

the additional capacity created by the £20 million investment;

PM4’s final closure decision;

and Kemsley’s resulting total output after the project.

Those details will reveal whether the proposal represents a large net capacity cut or primarily a migration of tonnage onto a more heavily invested machine.

Recovered Paper Suppliers Should Watch the Fibre Balance

Recovered-paper suppliers have another metric to follow.

Kemsley’s current scale makes it an important outlet for UK recycled fibre.

The new £48 million F-line is intended to increase fibre yield and remove contaminants more efficiently.

At the same time, the proposed PM4 shutdown could alter total furnish demand.

Those two changes work in different directions.

Better yield means more finished paper can potentially be produced from each tonne of usable recovered fibre.

Lower total paper-machine output would reduce fibre consumption.

Higher PM6 output could offset part of that.

Until DS Smith provides final post-project volumes, it would be premature to say the Kemsley proposal will materially reduce UK recovered-paper demand.

But recyclers should be watching.

A mill of Kemsley’s scale can influence regional fibre flows.

The Next Number That Matters Is PM6’s New Capacity

For the paper market, one missing figure now matters more than the £20 million investment itself.

What will PM6 be capable of producing after the upgrade?

Current published capacity: around 290,000 tonnes per year.

PM4 capacity proposed for closure: around 250,000 tonnes per year.

Proposed PM6 expansion: undisclosed.

Without that third number, analysts cannot reliably determine the net market effect.

The same applies to grades.

If PM6 gains the ability to cover a meaningful part of PM4’s current portfolio, the restructuring may be largely about consolidation.

If substantial PM4 grades disappear without replacement, it becomes a more significant supply reduction.

That is the next piece of information buyers should request.

Before Calling This a Capacity Cut, Follow Where the Tonnes Go

For corrugated converters, recycled-paper suppliers and containerboard buyers, the most useful way to assess DS Smith’s UK restructuring is not simply to count closures.

Track the tonnes.

At Launceston:

Which plants inherit its approximately 28,000 tonnes of annual paper conversion?

At Kemsley:

How much PM4 production disappears?

How much moves to PM6?

How much additional output does the £20 million rebuild create?

Which new grades will PM6 produce?

And what happens to recovered-fibre demand after the new configuration stabilises?

Those answers will tell us whether DS Smith is genuinely removing substantial market capacity or primarily concentrating production into fewer, more heavily invested assets.

The difference matters.

A network with fewer sites can still produce similar volumes.

A mill with fewer paper machines can still increase output on the machines that remain.

And a restructuring programme can reduce employment while simultaneously increasing capital intensity elsewhere.

That is why the Launceston and Kemsley announcements should be read together.

DS Smith’s UK story is not simply about what it is closing. It is increasingly about where it has decided future tonnes should be made.

Last Updated on 07/09/2026 by Jota Machinery