Overview #
Artwork file preparation is the single most common source of production delays we see across all packaging categories — not material lead times, not tooling, not print scheduling. When a brand partner submits files that don’t match our prepress requirements, we lose 3–5 working days minimum on correction cycles before a single sheet hits the press. This guide covers how artwork file requirements shift across four major brand verticals we produce for — beauty and personal care, food and beverage, consumer electronics, and health and wellness — and what each vertical demands in terms of structural specs, print parameters, and file setup. If you’re briefing us on a new project, this is the technical context our prepress team works from every day.
Beauty & Personal Care: Colour Accuracy and Surface Finish Alignment #
For beauty brands, colour fidelity is non-negotiable. We run sheet-fed offset on folding carton work for this vertical, and our standard register tolerance is ±0.2mm — anything tighter than that requires a dedicated makeready run and adds cost. The more critical issue is how brand colours are specified in the artwork file.
We require all spot colours to be called out as named Pantone Matching System (PMS) references in the file — not as CMYK builds approximating a Pantone. A CMYK build of Pantone 812 C will shift 8–12% in chroma depending on substrate OBA content and ink laydown sequence. If your brand standard is a PMS colour, it must be in the file as a separation, not a process simulation.
For beauty cartons, we typically run on 350–400 GSM SBS (Solid Bleached Sulphate) board. The white point of SBS is critical for cosmetic packaging — we specify a minimum brightness of 88 ISO for premium beauty work. Artwork files must be set up with bleed at 3mm minimum; we reject files with less than 2mm bleed on any edge.
Surface finishing specs must be declared in the brief before file setup begins. A soft-touch matte laminate over a UV spot varnish requires the spot varnish layer to be built as a separate fifth colour separation in the file. We’ve had brands submit files with the spot varnish merged into the CMYK layers — that costs us a full prepress rebuild.
| Finishing Combination | File Requirement | Common Error |
|---|---|---|
| Gloss BOPP laminate + spot UV | Separate spot UV layer, 100% K | Spot UV merged into CMYK |
| Soft-touch matte + foil stamp | Foil as separate Pantone metallic layer | Foil area not trapped to substrate |
| Aqueous coating (full flood) | No separate layer needed | Overprint settings incorrect on text |
Food & Beverage: Compliance Layers and Barcode Integrity #
Food and beverage packaging introduces regulatory requirements that directly affect file structure. For any food-contact carton or flexible pouch, we require confirmation of compliance with FDA 21 CFR 176.170 (for paperboard in contact with aqueous foods) or EU Regulation 10/2011 (for plastic films in food contact). These aren’t just legal checkboxes — they affect which ink systems and coatings we specify, and that affects how the file is built.
Barcode placement and sizing is the most frequent technical failure we see in food packaging files. GS1 General Specifications require a minimum bar height of 69% of the symbol width for EAN-13 codes, and a quiet zone of at least 3.63mm on the left and 2.31mm on the right. We scan every barcode on our prepress verification checklist before approving a file for plate output. In our experience, roughly 1 in 5 food packaging files we receive has a barcode that fails the quiet zone requirement — usually because a designer has scaled the symbol down to fit a small panel without recalculating the quiet zone.
For flexible packaging in this vertical — stand-up pouches, flow wraps — we run rotogravure printing on BOPP, PET, or PE laminate structures. Minimum line screen for gravure on flexible is 150 lpi; fine text below 6pt will fill in on press. Files must be supplied at 300 dpi minimum at final print size, in CMYK with no RGB objects embedded.
We also require a separate dieline layer in the file, locked and non-printing, built to our structural template. If a brand supplies artwork without a matched dieline, we rebuild it — that’s a 1–2 day delay and a recheck cycle.
Consumer Electronics: Rigid Box Tolerances and Colour Consistency Across Components #
Electronics packaging typically involves rigid set-up boxes with multiple components — lid, base, inner tray, sleeve — all of which must colour-match across different substrates and print processes. This is technically the most demanding multi-component colour alignment challenge we handle.
We specify 1.5–2.5mm greyboard for rigid box shells depending on box size and weight of contents. The wrap paper is typically 128–157 GSM coated art paper, printed sheet-fed offset and then laminated before wrapping. The critical file requirement here is that all components must be supplied as a single linked colour-managed document, not as separate files with independently built CMYK values. A 5% difference in black ink density between the lid wrap and the sleeve will be visible under retail lighting.
We work to G7 Master Qualification standards on our sheet-fed offset lines, which means we target a maximum ΔE of 3.0 between proof and press sheet under D50 illuminant. Brand partners should supply an ICC-profiled PDF/X-4 file — we do not accept RGB files or untagged PDFs for electronics packaging.
For electronics brands with regulatory text requirements (CE marking, FCC ID, RoHS compliance statements), all regulatory text must be set at minimum 6pt in a non-condensed typeface and must not be placed over a halftone background. We flag any regulatory text below 5pt as a prepress hold.
Health & Wellness: GMP Traceability and Variable Data Requirements #
Pharmaceutical and health supplement packaging operates under GMP (Good Manufacturing Practice) requirements that affect both file structure and our production workflow. Under GB/T 19720 and relevant GMP guidelines, packaging for regulated health products must support lot number and expiry date printing — either via offline inkjet coding or inline hot-stamp foiling.
Variable data fields (lot number, expiry, batch code) must be clearly marked in the artwork file as placeholder zones with defined dimensions. We require a minimum clear zone of 8mm × 25mm for inkjet coding on carton panels. If the artwork crowds this zone with decorative elements, we cannot guarantee legible coding — and that’s a GMP non-conformance.
For this vertical, we run AQL 2.5 inspection on all finished carton lots per ANSI/ASQ Z1.4, which means a sample size of 125 units from a 1,200-piece lot. Any lot with more than 7 defects in the sample is rejected and 100% inspected. Brand partners should factor this into lead time — a rejection event adds 3–5 working days.
Colour for health and wellness brands often involves regulatory colour coding (e.g., product strength differentiation). These must be specified as PMS references in the brief, not described as “a medium blue” — we cannot accept colour descriptions without a PMS or CMYK value attached.
Specification Notes for Brand Partners #
When you brief us on a new packaging project, the first thing our prepress team needs is your brand colour standard document — PMS references, approved CMYK builds, and any existing ICC profile your studio works to. Without this, we’re guessing at colour intent, and that costs both of us time.
The most common mistake we see from brands new to OEM production is submitting “design-ready” files that were built for screen presentation, not print production — RGB colour mode, no bleed, fonts not outlined, spot colours not separated. These files cannot go to plate without a full prepress rebuild.
Our standard process: digital proof (colour-accurate PDF) in 3–5 working days from file receipt, physical press proof or sample in 10–15 working days, production lead time 20–30 working days after sample approval depending on quantity and finishing complexity. For rigid boxes, add 5–7 working days for assembly. We assign a dedicated prepress contact to each brand partner so file revision cycles don’t get lost in general email queues.
Frequently Asked Questions #
Q1: What file format and resolution do you require for production artwork?
A: We require PDF/X-4 format for all offset-printed packaging, supplied at 300 dpi minimum at final print size. RGB files and untagged PDFs are not accepted — all colour must be in CMYK or named PMS separations. For gravure flexible packaging, we also require a separate dieline layer in the file.
Q2: What is your standard lead time from artwork approval to finished goods?
A: Our standard production lead time is 20–30 working days after sample approval for folding cartons and flexible packaging. Rigid box projects run 25–35 working days due to the assembly stage. If your file requires a prepress rebuild, expect an additional 3–5 working days before the clock starts on production.
Q3: Do you support GMP-compliant packaging for health supplement brands?
A: Yes — we run AQL 2.5 inspection per ANSI/ASQ Z1.4 on all health and wellness packaging lots, and we support variable data coding (lot number, expiry date) via inline inkjet or hot-stamp. Variable data zones must be declared in the artwork file as a minimum 8mm × 25mm clear area.
Q4: Can you match our existing brand colours across rigid box wraps and folding carton sleeves?
A: We can, but it requires all components to be supplied as a single colour-managed document with a shared ICC profile. We work to G7 Master Qualification standards targeting a maximum ΔE of 3.0 between proof and press sheet. Supplying components as separate files with independently built CMYK values is the most common cause of visible colour mismatch across packaging components.
Q5: What happens if our barcode fails your prepress check?
A: We flag it as a prepress hold and contact you before proceeding. The most common failure is a quiet zone below the GS1 minimum — 3.63mm on the left of an EAN-13 symbol. We can advise on resizing or repositioning, but we will not output plates with a non-compliant barcode. Resolving this typically adds 1–2 working days to the prepress timeline.
Planning a packaging project? Contact our team to request a complimentary specification review and sample quote.
