Flexo vs Offset vs Gravure vs Digital Printing for Packaging

How do flexo, offset, gravure and digital compare?

Flexo, offset, gravure and digital differ mainly in how the image carrier is made and how ink reaches the substrate. That difference drives set-up cost, which in turn sets the run length at which each process becomes economical.

LPI figures are indicative and vary with press, plate technology, substrate and ink. A coarse, absorbent kraft paper limits any process; a smooth coated board lets the press show its best.

How does flexographic printing work?

Flexography prints from raised, flexible plates. An engraved anilox roll meters a precise film of ink onto the plate, and the plate transfers it directly to the substrate. It runs fast on reels, handles absorbent and non-absorbent materials, and is the dominant process for paper bags, wraps, napkins, plastic film and corrugated board.

The anilox roll sets what flexo can do: its cell count and volume control how much ink is laid down. Fine anilox rolls suit halftones and detail; coarse ones lay heavy solids. A single press often has to compromise between strong solid colours and fine vignettes, which is why flexo designs with large flat areas and a few spot colours look excellent, while photographic artwork needs careful preparation.

Plates are made per colour and mounted on sleeves or cylinders. In German quotations you will see these as Klischees and the plate charge as Klischeekosten. They are a one-off cost per design that can be reused on repeat orders if the artwork does not change. Modern high-definition and flat-top-dot plates have narrowed the gap with offset, especially on film.

Strengths: speed on reels, low cost per unit at volume, works on porous kraft and on films, water-based and UV ink options, can print and convert inline (for example, printing and making bags in one pass).

Limitations: dot gain on soft or absorbent paper, fine text and reversed type need minimum sizes, some colour variation between runs if ink and anilox are not controlled.

Typical products: custom printed paper carrier bags, takeaway and food bags, custom printed greaseproof paper, napkins, custom printed plastic bags, post-printed corrugated boxes. For the specifics of film, see printing on plastic bags; for thin food-contact papers, see printing on greaseproof paper.

How does offset (litho) printing work for packaging?

Offset lithography, usually shortened to "litho" in the UK trade, uses flat plates where image areas attract ink and non-image areas attract water. The inked image is offset onto a rubber blanket and then onto the sheet. Sheet-fed offset gives the sharpest detail and smoothest gradients of the common processes and is the standard for printed folding cartons, paper cup blanks and litho-laminated corrugated.

Offset plates are inexpensive compared with flexo plates or gravure cylinders, but every job needs make-ready: plates mounted, ink keys set, colour brought up to target on waste sheets. That time is a fixed cost per job. Sheet-fed presses commonly run four process colours plus one or two spot colours and an inline coating unit for varnish or aqueous coating.

Offset needs a smooth, consistent surface. Coated folding boxboard and solid bleached board suit it best; uncoated kraft board can be printed but looks softer and darker. Paper cups are printed on flat cupstock (by sheet-fed offset, or by web offset or flexo from reels), die-cut into fan-shaped blanks and then formed, which is why cup artwork must be prepared as a distorted (arced) layout; the paper cup printing article covers that geometry.

Strengths: fine detail and small type, photographic images, wide colour range with CMYK plus spot, consistent across a run when the press is well controlled.

Limitations: sheet-fed only for most packaging (not suited to printing reels for bag-making), less suited to film, make-ready waste on short runs.

Typical products: custom printed folding cartons, burger and takeaway boxes in board, custom printed paper cups, premium laminated carrier bags, litho-laminated custom printed pizza boxes and custom printed mailer boxes.

When does gravure printing make sense?

Rotogravure prints from metal cylinders with millions of tiny engraved cells; deeper cells carry more ink. It delivers rich, consistent colour and very smooth tones at high speed, but the cylinders are expensive, so gravure pays off on long, repeating runs, mostly on film for flexible packaging.

Each colour needs its own cylinder, engraved electromechanically or by laser and usually chrome-plated for durability. Cylinders last for very long runs and keep colour stable from first metre to last, which is why large brands of snacks, coffee and confectionery use gravure for pouches and laminated wrappers. Gravure handles solvent-based and water-based inks and prints reverse side on clear film that is later laminated, which protects the ink.

The catch is commitment. A design change means new cylinders, and the cost of a cylinder set only makes sense when the volume of a single design is large. For many mid-sized brands, modern HD flexo on film now reaches comparable quality at lower set-up cost.

Typical products: custom printed stand-up pouches and laminated films, some high-volume paper bags and gift wraps, pre-print liners for corrugated.

Is digital printing good enough for packaging?

Yes, for many uses. Digital presses (inkjet or toner) print directly from the file with no plates or cylinders, so set-up cost is minimal and every sheet can differ. Quality on suitable substrates can match offset, but cost per unit stays relatively flat as quantity rises, so digital is strongest for short runs, prototypes, seasonal versions and market tests.

Digital is also how many suppliers produce printed pre-production samples, since the same file prints without tooling (see packaging sampling and quality control). Machine capability varies widely: some presses handle carton board sheets, some reels of label or flexible film, some corrugated sheets. Ink type matters for food packaging, since migration and set-off requirements apply to inks on the non-food side as well; check with the supplier which ink system is used and what documentation supports it. The food-contact angle is covered in food-contact packaging compliance.

Strengths: no plate costs, fast changeover, variable data and versioning, realistic samples.

Limitations: higher unit cost at volume, limited substrate range per machine, spot colours are simulated rather than mixed, white ink and metallic effects depend on the machine.

How do set-up costs and run length decide the process?

Total cost is roughly a fixed set-up cost spread over the run plus a running cost per unit. Digital has almost no fixed cost but the highest running cost; gravure has the highest fixed cost and the lowest running cost; flexo and offset sit in between. The crossover points depend on format, colours and machine, so they are confirmed at quotation rather than fixed rules.

This is why minimum order quantities differ so much between products. The full logic of MOQ is explained in what determines MOQ in custom packaging, and price structure in custom packaging cost drivers.

Which process gives the most consistent colour?

Gravure is generally the most stable over a long run because the cylinder volume does not change. Offset is highly consistent when controlled with densitometry or spectrophotometry. Flexo can be very consistent with modern plates and controlled anilox rolls but is more sensitive to substrate and ink viscosity. Digital is repeatable from a calibrated device, but different digital machines may not match each other.

Two practical points matter more than the process itself. First, substrate: a spot colour on brown kraft never looks like the same ink on white board, whichever press is used. Second, process changes between orders: if a design moves from digital samples to flexo production, or from offset to flexo for cost reasons, expect visible differences unless targets are defined numerically. Colour targets, tolerances and approval are covered in Pantone vs CMYK in packaging.

Which print method suits which packaging product?

The format usually decides. As a rule of thumb: bags, wraps and napkins are flexo; cartons are offset, and cups are offset or flexo depending on design and volume; laminated pouches at volume are gravure; short runs and samples are digital. Corrugated can go several ways, depending on quality needs.

Screen printing and corrugated pre-print vs post-print

Screen printing pushes thick ink through a mesh stencil. It lays down a heavy, opaque film, which makes it useful for bold logos on dark or textured substrates, on finished bags made from non-woven, cotton or rigid materials, and for special effects such as raised or tactile inks. It is slow and best for simple, few-colour designs; it is rarely the main process for disposable foodservice packaging.

Corrugated board can be printed at three stages, and this choice affects quality, cost and minimum volume:

Choosing a process: decision rules

Start from the product and quantity, then check whether the quality you want is achievable on that substrate. These rules cover most cases:

• If the product is made from reels of paper or film (bags, wraps, napkins, plastic bags), expect flexo, or gravure only at very high and stable volumes.
• If the product is cut from sheets of board (cartons, cups, board boxes) and needs photographic quality or fine type, expect offset.
• If you need fewer than a few thousand pieces, multiple versions, or a printed sample before committing, ask about digital.
• If your design relies on one or two strong brand colours with flat areas, flexo will reproduce it well and economically; save offset for gradients, photos and small text.
• If the order will be repeated many times with an unchanged design, one-off tooling (plates, cylinders) becomes a smaller share of the total; keep artwork stable across reorders to reuse it.
• If you plan to switch process later (for example, digital launch, flexo rollout), define colour targets numerically from the start.

When you request a quotation, give the format, material, dimensions, number of colours (and whether they are Pantone or CMYK), print coverage, quantity per design and expected annual volume. The packaging RFQ guide lists everything a manufacturer needs, and the packaging artwork guide explains how to prepare files once the process is known. 9 Packaging, based in Istanbul, manufactures and exports printed packaging for business customers, and the print process for each item is confirmed at quotation and technical review. Send your details through our contact page.

Related reading

• Packaging glossary: paper, board, print and compliance terms
• Printing and Prepress Glossary for Packaging
• How Custom Printed Packaging Is Made: Production Process Guide