How Corrugated Packaging Is Made: Pizza Boxes and Mailer Boxes

How are corrugated boxes made? The process in seven stages

On the corrugator, a fluted paper medium is glued between flat liners with starch, the bond is cured with heat and the continuous web is cut into sheets. The sheets are then printed, die-cut, sometimes glued, and packed flat for delivery.

1. Raw materials: liner and fluting reels are received, checked and conditioned.
2. Corrugating: the medium is fluted and bonded to liners to form single-wall or double-wall board, then slit, scored and cut into sheets.
3. Conditioning: sheets rest so moisture and temperature even out and warp settles.
4. Printing: either the finished sheet is printed (post-print), the liner is printed before corrugating (pre-print), a printed paper sheet is laminated on (litho-lamination), or the sheet is printed digitally.
5. Die-cutting: the outline, vents, slots and creases are cut on a rotary or flatbed die cutter, and waste is stripped.
6. Finishing: mailers may get tear tape, peel-and-seal strips or glued crash-lock bases; most pizza boxes and mailers are delivered flat with no glue.
7. Inspection, bundling and palletising: boxes are checked, counted, bundled, strapped and stacked for transport.

Many box makers run all seven stages. Others, often called sheet plants, buy corrugated sheets from a corrugator plant (a sheet feeder) and do the printing and converting themselves. Both models are common; what matters to a buyer is that board specification and converting are controlled together, because most corrugated defects start on the corrugator and only become visible after printing and cutting.

Raw materials and incoming inspection

Corrugated board is built from two kinds of paper: liners, which form the flat faces, and fluting medium, which forms the wave between them. Their fibre type, grammage, moisture and compression strength decide most of the finished box's performance, so incoming reels are checked before they reach the corrugator.

Liners and fluting

Ranges are indicative and depend on the mill and region. Reel widths are matched to the corrugator's working width (its deckle), commonly in the range of about 1.8-2.8 m, with some newer lines wider.

What is checked when reels arrive

• Grade and grammage against the order, using mill certificates and spot checks (grammage to ISO 536).
• Moisture content, commonly in the region of 7-9 % for corrugator papers. Liners with very different moisture levels are a classic cause of warp later.
• Compression properties (for example short-span compression, SCT) for papers that drive ECT, where the converter tests them or relies on mill data.
• Reel condition: damaged edges, flat spots, wet or crushed reels, splices marked by the mill.
• Shade and surface of white-top and coated liners, which become the print face.
• For food-contact grades: the paper mill's declaration of compliance for the specific grade and the fibre origin (virgin or recycled), so the right reel ends up on the food side.

Reels stored in cold warehouses or shipped in winter are usually allowed to reach room temperature before running, because cold, damp paper bonds and flutes poorly. Starch, borax, caustic soda and any additives for the adhesive are received as batches and logged for traceability. Paper and board terms are explained in the materials glossary, and the broader paper landscape in packaging paper grades.

How does a corrugator make corrugated board?

A corrugator (German: Wellpappenanlage) is a continuous line, often well over 100 metres long, that unwinds paper reels, steams and flutes the medium, glues it to liners with starch, cures the bonds on heated plates and cuts the finished board into sheets. It runs one order after another without stopping, so a single line produces board for many customers in a shift.

Line speeds on modern corrugators typically reach several hundred metres per minute, but actual speed depends on the machine, flute, paper grades and order mix. The stations in order:

The single facer: corrugating rolls and steam

The single facer is where the flute is born. The medium, softened by steam and heat, runs between two heated, meshing corrugating rolls whose profile defines the flute (E, B, C and so on). The rolls are steam-heated, with surface temperatures typically in the region of 160-190 °C depending on line and grade. Modern single facers hold the fluted medium against the lower roll by vacuum or air pressure rather than mechanical fingers, so the flute keeps its shape.

A glue roll, metered by a doctor roll, transfers a thin line of starch onto each flute tip. The preheated liner is then pressed onto the tips by a pressure roll or pressure belt. The combination of liner, flute and one bond line is called single-face web. A flute profile changes only when the corrugating rolls are changed, which is why a line is often set up for a limited set of flutes, and why less common profiles can take longer to schedule.

Fluting consumes more medium than the length of board it produces. The ratio, called the take-up factor, is indicatively around 1.2-1.5 depending on the flute profile (roughly 1.25 for E, 1.3-1.35 for B, 1.4-1.45 for C), with finer flutes at the lower end. That is one reason a B-flute box uses more fibre than an E-flute box of the same size.

Starch adhesive: how the bond forms

Corrugated board is bonded with starch, most often in a Stein-Hall type (carrier) system. A small portion of starch is cooked with caustic soda into a viscous carrier, and a larger portion of raw, uncooked starch is suspended in it. Borax is usually added for tack and viscosity control. When the glue line is heated in the single facer or on the hot plates, the raw starch gelatinises in a fraction of a second and forms the bond.

The temperature at which this happens, the gel point, is typically set somewhere around 55-65 °C. Solids content is commonly in the range of about 20-30 %, and application is only a few grams per square metre per glue line. Adhesive variants include no-carrier systems, which cook the starch differently, and moisture-resistant formulations with added resins for boxes that face humid or wet conditions. Additives matter for food contact, so the adhesive formulation belongs in the food-contact documentation for pizza boxes.

Three adhesive parameters explain many board problems:

• Viscosity: too thin and the glue soaks into paper without bonding; too thick and it builds heavy glue lines that cause washboarding.
• Gel point: too high and bonds do not set at speed; too low and the starch sets in the glue pan.
• Glue gap: the gap between glue roll and flute tips must suit the flute height and run straight across the web; a gap set for B-flute will flood an E-flute board.

The double backer and hot plates

After the bridge, the single-face web (or two webs for double wall) passes the glue machine, meets the preheated second liner and enters the double backer. Here the board moves over a series of steam-heated hot plates, pressed down by a belt and ballast rollers or air pressure, so the starch gels and water is driven off. A cooling section and traction belt follow.

This is the most sensitive zone for warp and caliper. Too much heat or pressure can crush flutes and reduce caliper; too little leaves weak, wet bonds. Many lines adjust plate heat and pressure by grade and speed, and some have cross-direction controls for moisture. EB double-wall board uses two single facers feeding a shared double backer.

Slitter-scorer, cut-off and stacking

At the dry end, the slitter-scorer cuts the web lengthwise into the widths needed for one or more orders and adds scores along the machine direction. Scheduling software combines orders across the deckle to reduce edge trim, which is why corrugator plants prefer orders that fit their standard grades and widths. The cut-off knife then cuts sheets to length, and the stacker forms stacks for transport to the converting area. Sheets usually rest before printing, often for some hours, so moisture and temperature equalise and any warp can relax or be measured.

Board grade combinations for pizza boxes and mailers

A board grade is the combination of flute, liners and fluting medium, often written as outer liner / medium / inner liner with grammages. The same flute letter covers a wide range of strengths, so specifying the full build is what makes quotations comparable.

The site-wide typical calipers used across our guides are:

Calipers vary between corrugator lines and paper mills, and they shrink if the board is crushed in printing or die-cutting.

Grades are commonly written in a code such as K/T/T or a grammage string. The examples below show how builds are typically assembled; they are illustrations, not standard grades:

For how to choose between grades and how ECT and burst relate to stacking, see corrugated board grades for mailer boxes; for the pizza-specific choice, see E-flute vs B-flute pizza boxes.

Liner placement and the food side

On the corrugator, one liner is applied at the single facer and the other at the double backer. Which of these becomes the inside of the box depends on how the sheet is printed and cut. For pizza boxes this is a production control point: the virgin or barrier liner specified for the food side must be the one that ends up inside, and printing must go on the other face. A mix-up is a critical defect, not a cosmetic one, so converters usually lock liner position into the job card and check it at first-off.

Why does corrugated board warp, and how is moisture controlled?

Corrugated board warps when its two liners hold different amounts of moisture or have been heated differently, so one face shrinks or expands more than the other. Corrugator crews control warp mainly through preheater wrap, glue quantity, plate heat and paper moisture, because warped sheets jam printers and die cutters and give boxes that will not stand square.

Warp is described by direction:

• Up-warp and down-warp: the sheet curls towards one face along or across the corrugator direction.
• S-warp: the sheet curls one way at one end and the other way at the other, often linked to moisture differences across the reel width.
• Twist: diagonal corners lift, often from uneven moisture across the web.

The levers available on the line:

• Balancing liner moisture with preheater wrap: more wrap dries a liner more.
• Reducing glue where the line is overgluing, because starch carries water into one side.
• Adjusting double backer heat and pressure by grade and speed.
• Running reels with similar moisture profiles, and rejecting reels with wet streaks or damaged edges.
• Conditioning sheets before converting, and, for litho-lam, allowing laminated sheets to settle before die-cutting.

Box makers usually agree a warp limit for sheets entering printing and die-cutting, often expressed as millimetres of lift over the sheet length. For a buyer, warp shows up as boxes that rock on a flat surface, pizza boxes whose lids spring open, and mailers whose front tuck will not stay closed. Board continues to exchange moisture with the air after production, so warehouse humidity can create warp that was not there at dispatch.

Micro-flute production: what changes for N, F and E

Micro-flutes are the fine profiles (E, F, N and similar) that behave more like thick carton board than shipping board. They need finer corrugating rolls, lighter papers and gentler handling, and they are often converted on equipment similar to folding carton lines.

What is different in production:

• Corrugating: finer profiles have many more flutes per metre, so the glue lines are closer together and glue quantity must be tightly controlled. Overgluing shows quickly as washboarding on a smooth printed surface.
• Papers: lighter liners and media are common, which makes moisture balance and warp control more sensitive.
• Print: micro-flute's flat surface supports higher screen rulings in flexo and makes direct offset printing on the board possible on suitably adapted sheet-fed presses, alongside litho-lamination.
• Crush sensitivity: a 0.6 mm N-flute has little caliper to lose. Excess nip pressure in printing, feeding or die-cutting can flatten flutes and remove much of the stiffness the buyer paid for.
• Converting: flatbed die-cutting and carton-type folder-gluers are commonly used, which is why micro-flute mailers and small pizza or slice boxes can look like cartons with corrugated stiffness.

For the carton-side equivalents of these steps, see how folding cartons and takeaway boxes are made.

How are pizza boxes and mailers printed?

Corrugated packaging is printed by one of four routes: flexo post-print on the finished sheet, pre-print on the liner reel before corrugating, litho-lamination of an offset-printed sheet onto single-face board, or digital inkjet. The route fixes the achievable print quality, set-up cost and how much the board can be crushed in the process.

How buyers should choose between these routes for a pizza box is covered in pizza box printing, and the cross-product comparison in flexo vs offset vs gravure vs digital printing. Below is what each route involves in production.

Flexo post-print

In post-print, finished sheets are fed one at a time, usually lead-edge fed with vacuum transfer to keep them flat, through flexo print units. Each unit has a photopolymer plate mounted on a carrier sheet or sleeve, an engraved ceramic anilox roll and, on most modern machines, a chambered doctor blade that meters water-based ink.

For corrugated post-print, anilox screens are indicatively in the range of roughly 150-400 lines per inch with cell volumes of a few billion cubic microns (BCM) per square inch, coarser for heavy solids and finer for detailed work; high-definition post-print can use finer screens still. Halftone screen rulings on board are correspondingly coarse, commonly well below those used in offset. These values depend on machine, plate type and board.

The key production parameter is impression: the plate must kiss the board, not squeeze it. Too much pressure crushes flutes, which reduces caliper, edge crush and box compression strength. Print-and-convert lines combine print units with downstream stations:

• Flexo folder-gluer (FFG): print units, then slotting or rotary die-cutting, then folding and gluing of the manufacturer's joint, with a counter-ejector delivering bundles. Used for glued boxes such as regular slotted cartons; for flat die-cut pizza boxes and mailers, the folding and gluing section is not needed.
• Flexo printer with rotary die cutter (often called an RDC line): print units followed by a rotary die-cutting cylinder. A common route for high-volume flat pizza boxes and simple mailers.
• Printer-slotter: print units with slotting and scoring heads, for simple slotted styles.

Water-based flexo inks dry by absorption into the liner and by hot-air or infrared drying between units. Inks for packaging that is food-facing or stacked against a food-contact surface should be low-migration systems with supplier documentation.

Pre-print on liner reels

In pre-print, the outer liner is printed on a reel by wide-web flexo or gravure before it goes to the corrugator. Quality can approach offset because the liner is printed flat, with no flutes underneath. The printed reel then runs as the double-backer liner, so inks and varnishes must tolerate hot-plate temperatures and belt contact without scuffing or changing gloss. The corrugator's cut-off must also register to the print, using print marks read by sensors.

Pre-print suits very long, stable runs: start-up waste, cylinder or plate costs and the commitment of printed reels before the board even exists make it uneconomic for most pizza and mailer programmes, except at large retail or chain scale.

Litho-lamination

Litho-lamination (in German, Kaschierung, with the board called kaschierte Wellpappe) produces the highest print quality on corrugated packaging. A paper or thin board sheet is printed on a sheet-fed offset press, often varnished or coated, and laminated onto single-face corrugated (liner plus flute, with the flute tips exposed).

Production steps:

1. Offset printing of the face sheet, with plates per colour; conventional or UV-curing inks, with low-migration systems used where food-contact rules require them.
2. Single-face board is made on the corrugator or on a sheet-fed single facer, in E, F, N or occasionally B flute.
3. A laminator applies adhesive (typically starch-based or a water-based synthetic adhesive) to the flute tips, aligns the printed sheet to the single-face sheet and presses them together.
4. Laminated sheets are stacked and allowed to settle, because water from the adhesive and the printed sheet must equalise before die-cutting or the sheets warp.
5. Flatbed die-cutting, which suits the precision needed to register cut lines to printed artwork.

Key parameters are adhesive quantity (too much causes warp and washboarding, too little gives bubbles and delamination), sheet-to-flute alignment, and the grain direction of the printed sheet relative to the flutes, which affects curl. Direct offset printing on micro-flute board, without lamination, is a related route for fine flutes on adapted presses.

Digital inkjet on corrugated

Digital printing on corrugated uses inkjet heads to print directly on sheets, either in a single pass at production speeds or in several passes on smaller machines. Water-based pigment inks, often over a primer, are common for packaging used near food; UV-curing inkjet is also used for some corrugated applications but needs careful assessment where migration matters. Some plants print liner reels digitally before corrugating, which combines digital flexibility with pre-print quality on longer runs.

Digital needs no plates, so short runs, seasonal designs and variable data are practical. Cost per box depends heavily on ink coverage, so a flood-coloured mailer costs much more to print digitally than one with a logo. Because nothing touches the board, digital avoids the impression crush of flexo, though sheet flatness still matters for print head clearance.

Prepress for corrugated

Whatever the route, prepress starts from the box's die line. For flexo, artwork is separated into spot colours, trapped, and distorted on the plate to allow for plate stretch around the cylinder; minimum line weights and text sizes are larger than for offset. Plates are mounted to register on carrier sheets or sleeves. Litho-lam follows offset prepress rules; digital works from a colour-managed file. File preparation, bleed and proof approval are covered in the packaging artwork guide, colour standards in Pantone vs CMYK in packaging, and printing terms in the printing and prepress glossary. Inside print, which needs a second pass or a pre-printed inner liner, is explained in inside printing for mailer boxes.

How are pizza boxes and mailers die-cut?

Pizza boxes and mailers are die-cut either on a rotary die cutter, which cuts against a rotating anvil at high speed, or on a flatbed (platen) die cutter, which stamps the sheet with a flat steel-rule die. Rotary is common for high-volume, simpler flexo-printed boxes; flatbed gives tighter tolerances and is the usual choice for litho-lam, micro-flute and intricate mailers.

Creasing, scoring and cracking

Creases let corrugated board fold cleanly without the liner cracking. On a die, crease rules press the board into a matching channel; on the corrugator, machine-direction scores are made by the slitter-scorer. Crease rule height and width must suit the flute and grade: too shallow and the box folds in the wrong place or springs open; too deep and the inner liner cracks or the fold weakens. Crease-to-crease dimensions, set by the structural designer, include allowances for board thickness so the box reaches the required internal size. The carton-side detail of dies and prototyping is in carton dielines, cutting dies and structural prototyping.

Vent holes, slots and pizza-specific features

Pizza box vents are cut by the die at the same time as the outline. Fully punched holes leave waste chads that must be stripped, and loose chads inside a food box are a hygiene defect, so stripping is checked closely. Push-out vent tabs use partial cuts or perforations and leave the tab attached until the operator opens it, which avoids loose waste. Front-lock slots, thumb notches and tear-off sections are cut in the same pass. Every perforation or slot weakens the panel, so vent and lock positions are a structural decision as much as a functional one; vent design itself is covered in pizza box venting.

Tear strips, tape and closures on mailers

Mailers add features that pizza boxes rarely need:

• Perforated zipper tear strips cut by the die.
• Tear tape, a reinforced filament tape, applied to the board usually at the corrugator or on a separate applicator before die-cutting, so the die line must register to it.
• Peel-and-seal strips: a pressure-sensitive adhesive with a release liner, applied after die-cutting by a tape applicator, sometimes inline.
• Inserts die-cut from the same board family, covered in mailer box inserts.

Nicks (small uncut bridges in cutting rules) hold the blank in the sheet until it is broken out. Their position and size are a compromise between stable transport through the machine and clean edges for the customer.

Folder-gluing or flat delivery?

Most pizza boxes and die-cut mailers leave the factory flat and unglued. They are self-locking styles that are folded by hand in the store or at the packing bench, which keeps freight volume low and avoids a gluing step.

• Pizza boxes: typically supplied flat, erected by staff before or during service. Some high-volume kitchens use box-erecting machines, which need tight dimensional consistency and flat sheets.
• Mailers: the standard FEFCO 0427-type mailer is supplied flat. Crash-lock or auto-bottom variants are pre-glued on a folder-gluer so they spring open with a pre-formed base; they cost more to make and take more space in transit.
• Shipping cartons (regular slotted containers) are glued at the manufacturer's joint on a flexo folder-gluer, but these are outside the formats covered here.

When a glued style is specified, the glue type (usually a cold water-based PVAc emulsion or hot melt), bead position and compression time affect bond strength, and a folder-gluer needs flat, square blanks. Folder-gluer principles are covered in more depth in the folding cartons production guide.

Food contact in corrugated production: what applies to pizza boxes?

Pizza boxes are food-contact materials, so production must keep the food-side liner suitable for hot, fatty food and stop ink and other substances transferring onto it. In the EU this falls under Regulation (EC) 1935/2004 and the Good Manufacturing Practice Regulation (EC) 2023/2006. Mailers are generally not food contact, unless they carry unwrapped food.

Virgin vs recycled liners and mineral oil

Recycled fibre can carry mineral oil hydrocarbons (MOSH and MOAH) from printed paper in the recovered fibre stream, and these can migrate into food, more readily at high temperatures and with fatty products such as pizza. There is no binding EU limit for mineral oil in packaging at present, but the topic is under regulatory attention and many buyers and retailers apply their own criteria. In production, the common responses are:

• A virgin kraftliner on the food side, with recycled fibre allowed in the medium and outer liner.
• A recycled food-side liner combined with a functional barrier designed to block migration at pizza temperatures; the barrier must remain repulpable for paper recycling.
• Controlling which reel goes where on the corrugator, and keeping food-side liner batches traceable.

Germany's BfR Recommendation XXXVI is the de facto benchmark for paper and board in the EU, and buyers typically expect a Declaration of Compliance referencing 1935/2004 and BfR XXXVI for the specific board grade. In the US, paper and board in contact with fatty foods is assessed against FDA rules such as 21 CFR 176.170. The barrier approach used on cartons is explained in mineral oil barriers for cartons, and the legal framework in food contact packaging compliance.

PFAS, grease barriers and adhesives

Most corrugated pizza boxes rely on board absorbency rather than a dedicated grease barrier. Where a grease-resistant liner or coating is used, it must be PFAS-free: from 12 August 2026, the EU Packaging and Packaging Waste Regulation, Regulation (EU) 2025/40, limits PFAS in food-contact packaging, and several US states ban intentionally added PFAS in food packaging. See PFAS-free food packaging and barrier coatings for paper packaging. Corrugating starch and its additives, including any wet-strength resins, should be covered by the board supplier's food-contact documentation.

Inks and set-off

Printing inks on the outside of a pizza box never touch the pizza directly, but they can still reach the food side. Flat pizza blanks are stacked face to back, so the printed outer face of one blank presses against the food-side liner of the next for days or weeks. Under GMP Regulation (EC) 2023/2006, printing inks on the non-food side must not transfer to the food-contact side through set-off in the stack or reel in amounts that would breach the safety requirements of Regulation (EC) 1935/2004. Converters manage this with suitable ink systems, full drying before stacking and controlled stack pressure. Printing inside the lid places ink on a food-facing surface and calls for low-migration inks with documentation. In Germany, the Printing Ink Ordinance in the Bedarfsgegenständeverordnung introduces a positive list for food-contact printing inks from 1 January 2027; Swiss Ordinance SR 817.023.21 and EuPIA guidance are widely used references.

Quality control during corrugated production

Corrugated quality is controlled at three points: board tests on the corrugator output, print and dimension checks at first-off and during the run, and finished-box tests on samples. Board strength tests are carried out on conditioned samples, normally at 23 °C and 50 % relative humidity under ISO 187, because moisture changes results substantially.

Typical in-process routine: first-off approval against the approved sample and die line, then periodic checks through the run on colour, register, cut and crease, plus board tests per batch or per shift. Sampling plans and acceptance limits are agreed in the approval documents; how AQL sampling works is explained in packaging quality control, and test terms in the testing and quality glossary.

For buyers, ECT and BCT need a reference condition. A box tested at 23 °C and 50 % RH will perform worse in a humid warehouse or a hot, steaming delivery bag, so pizza box specifications are best confirmed with practical tests in the actual operation alongside lab values. The relationship between ECT, caliper and BCT (the McKee formula) is set out in corrugated board grades for mailer boxes.

Common corrugated defects: causes and prevention

Most corrugated defects can be traced to a specific station. The table links what a buyer sees to where it usually starts.

Packing, palletising, storage and transport

Flat corrugated blanks are counted into bundles, strapped, stacked on pallets with corner protection and stretch-wrapped. Because corrugated board absorbs moisture from the air and loses strength as humidity rises, the packing method and storage conditions affect how the boxes perform on arrival.

Bundles and strapping

Blanks are counted into bundles, often by the counter-ejector at the end of the line, and secured with plastic or paper strapping. Bundle counts usually reflect what staff handle comfortably and how many fit in a store's storage space. For pizza boxes, bundles are often wrapped in paper or film to keep the food side clean during transport and in the store. Strap tension matters: too tight and the strap crushes edges, too loose and bundles shift on the pallet.

Pallet patterns and height

Bundles are stacked in patterns that use the pallet footprint fully without overhang, which weakens the bottom layers. Alternating bundle orientation between layers helps compensate for slight warp and keeps stacks from leaning. A top sheet or board, corner posts and stretch wrap finish the load. Pallet height is usually set by the receiving warehouse, racking and the vehicle or container. Specify the destination pallet: Euro pallet 1200 x 800 mm in most of the EU, 1200 x 1000 mm common in the UK, 48 x 40 in in the US.

Flat-pack density

Caliper directly sets how many blanks fit in a given height. As a rough guide, 1 metre of stacked single-layer (unglued, unfolded) blanks holds around 650 E-flute blanks at 1.5 mm, or around 330 B-flute blanks at 3 mm, before allowing for bundle wrapping and compression. Pre-glued crash-lock mailers ship folded flat with at least two board layers per box, so the same height holds roughly half as many. That is why E-flute pizza boxes and mailers ship and store more economically than B-flute, and why freight per box is a meaningful part of landed cost for corrugated.

Storage and transit conditions

• Store off the floor, wrapped, away from doors and wet areas, at stable humidity.
• In sea freight, temperature swings can cause condensation inside containers. Dry board at loading, intact wrapping and, where needed, desiccants reduce the risk.
• Let boxes reach room conditions before high-speed erection or machine erecting, especially after cold transport.
• Use stock first in, first out, because long storage in humid conditions can create warp and reduce compression strength.

Pallet sizes, loading and export documentation from Türkiye are covered in sourcing packaging from Türkiye.

How the production route drives MOQ, cost and lead time

Corrugated MOQ and lead time are set mostly by four things: whether the board grade is a standard grade on the corrugator schedule, whether new cutting dies are needed, how many printing plates are needed, and whether the job goes through litho-lamination. The detail on each lives in our MOQ, cost and lead-time guides; this section explains the production logic behind them.

For the commercial side, see packaging MOQ explained, packaging cost drivers and packaging lead times. MOQ for any specific box depends on material, size, print method and run configuration, and is confirmed at quotation.

Food-contact hygiene in corrugated production

Corrugated plants that supply pizza boxes typically work under a hygiene and GMP system that covers paper storage, pest control, glass and brittle plastic control, waste and chad management, cleaning, staff hygiene and traceability of reels and ink batches. Regulation (EC) 2023/2006 requires businesses in the EU food-contact supply chain to operate documented quality assurance and quality control systems.

Buyers often ask about third-party schemes that audit these controls. Common examples are BRCGS Packaging Materials, FSSC 22000 (which includes a packaging scope) and ISO 22000. Each has its own scope, so the useful questions are what the certificate covers (site, products, processes) and whether the corrugating and printing stages are both inside it. Points specific to corrugated:

• Paper dust and trim waste are controlled near open food-side surfaces and in bundles.
• Reels and pallets are protected from moisture, birds and pests in storage.
• Food-side liner reels and inks are traceable to finished batches, in line with the traceability requirement of Regulation (EC) 1935/2004.
• Pallets used for food-contact packaging are clean and dry; wrapping protects bundles from contamination in transit.
• Lubricants and cleaning agents near the product path are suitable for food-adjacent use.

Supplier audits and documentation are covered in how to choose a packaging manufacturer and food contact packaging compliance.

What to ask a corrugated box manufacturer about the process

The questions below turn production knowledge into a specification. They work whether you are sourcing pizza boxes for a chain or mailers for an e-commerce brand, and they make quotations comparable.

• Full board build: outer liner, medium and inner liner with types and grammages, flute and caliper.
• Which liner is on the food side, its fibre origin, and the food-contact documentation for that grade (for example a DoC referencing 1935/2004 and BfR XXXVI, or FDA references for the US).
• Print route (post-print flexo, pre-print, litho-lam or digital), number of colours and whether inside printing is involved.
• Ink system and how set-off onto the food side is controlled in stacked blanks.
• Die-cutting method (rotary or flatbed) and how print-to-cut register is held.
• Board strength targets: ECT, and BCT or practical stacking tests on finished boxes, with test conditions stated.
• Moisture and warp limits on delivered boxes.
• How vent waste and loose chads are controlled for pizza boxes.
• Bundle count, wrapping, pallet pattern, pallet height and pallet type for your destination.
• Retained samples, golden sample and approval process for repeat orders.
• Tooling: who owns cutting dies and plates, and how long they are stored for repeats.

Build these into the packaging RFQ guide template, check board terms in the converting and manufacturing glossary, and compare the other production routes on the how packaging is made hub. When the specification is ready, send your pizza box or mailer box requirements and we will review board, print route and converting options as part of the quotation.