Water-Based or UV Ink? Matching Ink and Process to Four Corrugated Applications

Most buyers open the conversation by asking which press is fastest. For food, personal-care, appliance and e-commerce cartons, the question that actually decides whether a job passes inspection is the ink set — water-based or UV. Get that wrong and the artwork does not matter. This piece maps ink, format and throughput onto four common applications.

Start with the ink, not the press

The ink set determines three things: odour, resistance to water and abrasion, and whether the sheet can go straight into finishing.

• Water-based ink — the dedicated water-based ink used on the RS1800-HPA3 contains no VOC solvents, so the shop floor stays odour-free. That suits food, personal-care and baby-product packaging.
• UV-curable ink — the RS2500-E20UV and RS2500-R16UV run dedicated UV ink that cures instantly under UV lamps. Output is waterproof and rub-resistant with high colour saturation, and it moves into finishing with no drying wait.

The trade-off runs the other way as well: water-based ink is less water- and abrasion-resistant than UV ink on board. Where moisture or rub resistance is a hard requirement, you either add a downstream step to a water-based line or specify a UV machine.

Food and cold chain: odour first, moisture second

Food cartons tend to fail acceptance on two counts: odour transfer, and how the print behaves once it gets wet.

For ambient dry-goods shippers, water-based is a reasonable starting point. The RS2500-E36S accepts both dedicated water-based dye ink and water-based pigment ink, and pigment holds up markedly better against moisture than dye on corrugated board — which suits cold chain, fresh produce and long-haul shipping. Test your own board to confirm the rating you need.

Where cartons meet ice, condensation or long sea freight, moisture resistance becomes a hard spec. There are two routes:

• Add finishing to a water-based line — both the RS2500-E72G and RS2500-E36S offer an optional inline drying and varnish unit for water-resistant output.
• Specify UV — the RS2500-E20UV cures on press, giving waterproof, rub-resistant prints that go straight to the next station.

One boundary is worth stating plainly: UV printing is fine for outer food packaging such as shipping and transport cartons. For direct food contact or strict odour-migration limits, confirm the application before locking in a configuration.

Personal care and baby products: odour-sensitive, barcode-critical

These packs are odour-sensitive, and the layout usually has to carry 1D or 2D barcodes plus small ingredient and regulatory text.

A water-based system clears the odour requirement: no VOC solvents, no harsh smell on the floor. On legibility, the RS1800-HPA3 prints at ≥1200×300 dpi with high-precision thermal inkjet heads, so fine text and 1D/2D barcodes print cleanly and scan reliably. Its format is 900 mm (35.4 in) wide at 10–30 m/min (33–98 ft/min), which fits a few thousand to tens of thousands of boxes a day with frequently changing specs.

If brand colour consistency is written into the contract, simulating a brand colour through CMYK overprinting invites run-to-run drift. The RS2500-R16UV is built for spot-colour work — a pre-mixed ink matched to a brand swatch rather than a four-colour simulation — so brand colour stays consistent between runs.

Appliances: stable sizes, long runs, wide board

Appliance cartons tend to have fixed dimensions, large single-spec runs and, often, large-format panels. Throughput is what matters.

• RS2500-E32S — 530 mm (20.9 in) print width at up to 200 m/min (656 ft/min) and >1200×150 dpi, for continuous runs of uniform narrow cartons.
• RS2500-E72G — 1,200 mm (47.2 in) at up to 150 m/min (492 ft/min). Its 72 high-precision piezo heads span the full width, so the image is laid down in a single pass instead of scanning back and forth.
• RS2500-E36S — the same 1,200 mm format at up to 106 m/min (348 ft/min), balancing throughput against investment.

All three accept 3–40 mm (0.12–1.57 in) board, covering common single- through double-wall grades — including the heavy double-wall used on many appliance packs.

E-commerce shipping: many SKUs, constant changeovers

The constraint here is not line speed but how often the job changes. Digital printing uses no plates: switching jobs is a file change, not a plate change or a washup. That matters most when SKU counts are high and specs shift constantly.

Shortlist by dominant carton width:

• Up to 900 mm — the RS1800-HPA3, plate-free and printing from a single sheet at 10–30 m/min.
• 1,200 mm and above, or above 100 m/min — choose among the RS2500-E72G, E36S and E32S on the width-versus-speed trade-off.
• 2,500 mm wide or very long boxes — the scanning models: RS2500-E16 (auto feed up to 2,500 × 1,350 mm / 98.4 × 53.1 in, manual feed 98.4 in wide with unlimited length, >360×1,200 dpi) or RS2500-E8 (2,500 mm / 98.4 in wide, unlimited length, >360×600 dpi, 8 heads).

One substrate boundary to keep in mind: folding cartons, card packaging and display board run on paper stocks, not corrugated. For those, the RS1900-E16 print–laminate–cut machine handles 1.9 m (74.8 in) wide stock with unlimited length at 80–160 m²/h (861–1,722 sq ft/h) and ≥360×600 dpi, with red, yellow, blue and black plus light cyan, light magenta, light black and light-light black across eight channels. It is specified for grey-back board, white card, coated paper and art paper, and is not a corrugated machine.

Three steps to a shortlist

• Fix the ink first. Ambient and dry → water-based dye or pigment. Wet, abrasive, or immediate finishing → UV, or water-based plus inline drying and varnish.
• Then fix the format. Up to 900 mm → RS1800-HPA3; the 1,200 mm class → RS2500-E72G or E36S; narrow and fast → E32S; 2,500 mm large format → the scanning models E16, E8, E20UV or R16UV.
• Then size throughput. Mixed specs and frequent changeovers favour changeover flexibility; uniform specs and long runs favour line speed.

Every plant runs different board, different ink coverage and different acceptance criteria. The figures above are taken from the published specifications for these models. To settle on a configuration, send your own artwork and board for a proof run, or speak with an application consultant about a configuration and pricing for your order mix.