TL;DR: The quality of your sample request brief directly determines whether the first sample hits — or whether you’re two iterations and six weeks in before production specs are confirmed.
TL;DR: Incomplete briefs account for roughly 70% of the sample iteration cycles we log under our SRQ-02 intake review procedure — and most come down to three missing data points.
The Specification Gaps That Trigger Requotes Before Sampling Even Begins #
The most expensive moment in a die cutting and converting project is not the tooling cost. It is the requote — when a supplier has to go back and reprice because the original brief was missing a board grade, a quantity tier, or a converting operation that only came up during sample review.
When a brief lands on our desk, the first thing we check is whether the substrate is specified. Not “cardboard” or “kraft paper,” but the actual grade: a 350gsm SBS for a folding carton lid, a 250µm PET for a window patch, a 1.2mm E-flute corrugated for a mailer. Without that, every cost calculation downstream is provisional.
Three parameters, missing in combination, cause almost every requote we see:
- Finished dimensions with tolerances — outer carton dimensions, window aperture size, and the kiss-cut depth if a liner is involved. We work to ±0.3mm on flatbed die cutting for SBS board and ±0.5mm on corrugated; if your structural drawing does not state a tolerance, we quote to our standard and your expectation may differ.
- Quantity tiers — the cost per thousand units at 10,000 pieces is meaningfully different from 50,000 pieces because die amortisation spreads across volume. Provide at least two tiers: your launch quantity and your expected annual reorder volume.
- Finish and converting sequence — whether a laminated film, spot UV, foil stamp, or window patching follows die cutting. Each secondary operation is a separate pass and affects both lead time and per-unit cost.
Per ISO 12647-2:2013, which governs offset print colour for packaged goods, a colour proof submitted without substrate specification is not a binding colour target. The same logic applies to die cutting: a spec without substrate and finish is not a binding brief.
Artwork File Requirements — What Actually Needs to Be in the Pack #
Sending a low-resolution visual for die cutting is a common time sink. Here is what we need, specifically.
Structural die line file: A vector PDF or AI file with the die line on a dedicated separation layer, clearly labelled. Cut lines, crease lines, and perforation lines must be on separate layers with distinct spot colours (typically PANTONE-coded or named “CutLine,” “CutCrease,” “CutPerf”). Bleed on all cut edges: minimum 3mm for SBS board, 5mm for corrugated. A bleed of less than 3mm creates choke risk when the board sheet shifts during feeding, and we have had to send back files for rework when bleed was under 2mm on a tight-register window cut.
Print artwork (if printed sample is required): 300 dpi minimum at final print size; CMYK or spot Pantone values declared; embedded ICC profile per ICC.1:2022. If you are supplying a PDF, export as PDF/X-4 with all fonts outlined and overprint settings verified.
What to specify for white samples: If you only need a structural white sample to confirm dimensions and converting mechanics (not colour), the artwork layer is not needed. Tell us that explicitly — it saves the pre-press pass and gets a white sample to you 4–5 working days faster.
One gap that causes repeated delays: brands submit a print PDF but do not include the die line file separately. The die line embedded inside a print PDF as a design element is not usable for tooling — it must be isolated and dimensionally verified against your structural drawing. Every time we have to extract and re-trace a die line, it adds 2–3 working days to the brief review cycle.
Sample Types, Timelines, and What Each Stage Actually Tells You #
| Sample Type | Purpose | Typical Lead Time | What It Validates |
|---|---|---|---|
| White sample (unprinted) | Structural fit, converting mechanics, dimension check | 7–10 working days | Die accuracy, crease quality, substrate behaviour, assembly fit |
| Printed proof (offline) | Colour, artwork positioning, finish appearance | 12–18 working days | CMYK/Pantone reproduction, register, finish spec match |
| Pre-production sample (PPS) | Full production-intent confirmation | 20–28 working days | Production die, inline print, finishing, full converting sequence |
Timelines assume substrate in stock and tooling not previously made. New tooling adds 4–6 working days for flatbed steel-rule dies, 8–12 working days for rotary tooling.
One point worth understanding: a printed proof is produced on production-intent substrate but may use a different press or a smaller sheet format than the production run. Colour values on a printed proof are comparable but not always identical to a full-run sheet, because ink laydown and press pressure vary slightly at different run speeds. This is why we request sign-off on the pre-production sample, not the printed proof, as the production colour standard per our internal PPS-sign-off protocol.
White samples are underused by brands. A confirmed white sample reduces the risk of discovering a structural problem after colour is approved — a window that fouls the crease, a glue tab that is too narrow for the converting speed, a tuck flap that does not lock under shipping stress. We always recommend white sample sign-off before committing print spend.
Evaluating a Received Sample — What to Check Before Signing Off #
When your sample arrives, the evaluation sequence matters. Check structure before colour; colour before finish; finish before assembly.
Structure: Measure the finished blank dimensions against the drawing. Check crease sharpness — a crease that cracks through the print layer on the first fold indicates insufficient crease depth or rule radius mismatch for the substrate caliper. For SBS at 350gsm, the crease channel width is typically 0.7–0.8mm against a 0.5mm rule; if it was cut narrower, you will see surface cracking. Window cut edges should be clean with no paper fibre tear-out greater than 0.2mm.
Converting operations: If there is a kiss cut (e.g. a label liner or a peel-open strip), test the peel force. Target peel force for kiss-cut pressure-sensitive labels on a 40gsm silicone liner is typically 0.3–0.7 N/25mm per ASTM D1876; too low and labels release in transit, too high and consumers cannot initiate the peel. Check the liner matrix removal: if the waste skeleton tears on removal rather than stripping cleanly, the nicking (tie points) spacing is wrong.
Print and finish: Verify Pantone colour under D50 illuminant (the standard viewing condition per ISO 3664:2009). Check foil stamp or emboss registration to the die line — the tolerance on our production line for foil-to-cut register is ±0.4mm on flatbed; tighter than that requires a dedicated register system and should be flagged in the brief.
Assembly test: Build the carton by hand. Does the tuck lock? Does the glue joint hold under a 30-second manual peel test? Does the window film stay flat and crease-free after assembly? These are binary pass/fail checks and there is no substitute for doing them physically.
Comparing Quotes from Different Suppliers Without Comparing Apples to Oranges #
Die cutting and converting quotes are almost never directly comparable without a normalisation step — because suppliers make different assumptions about substrate grade, die type, converting sequence, and inspection level.
When comparing quotes, request that each supplier break their pricing into: substrate cost (per thousand blanks, stated grade and weight), tooling cost (amortised or one-off), converting cost per thousand, and any finishing operations itemised separately. A quote that bundles everything into a unit price tells you nothing about where cost reduction is possible.
Four specifics to align before comparing:
- Die type: Flatbed steel-rule vs. rotary die is a cost and tolerance trade-off. Rotary dies carry a higher upfront tooling cost (typically 2–4x flatbed for the same format) but run at higher speed for large volumes. If one supplier quotes rotary and another quotes flatbed for a 50,000-piece run, the unit costs are not comparable without understanding the volume at which rotary tooling amortisation turns positive.
- AQL level: State AQL 2.5 per ANSI/ASQ Z1.4-2008 for general inspection of packaging blanks. If a supplier does not reference an AQL level in their quality plan, their defect rate assumption is undefined.
- Substrate grade equivalence: A “350gsm board” from one supplier may be SBS (solid bleached sulphate) and from another it may be FBB (folding box board). The converting behaviour, caliper, and surface finish are different. Require board grade and caliper (in µm) to be stated, not just GSM.
- Sampling cost: Some suppliers charge for samples (tooling, substrate, pre-press); others absorb them for qualified volume projects. Clarify before brief submission to avoid unexpected invoices.
Specification Notes for Brand Partners #
When you brief us on a die cutting and converting project, the fastest path to an accurate first quote and a single-iteration sample is a brief that contains: finished blank dimensions (length × width × depth where applicable, with stated tolerances), substrate grade and caliper, quantity tiers (minimum launch and 12-month forecast), converting operations in sequence (die cut → crease → laminate → foil → window patch, etc.), and the sample type you need first.
The gap that causes the most sample iterations is undeclared substrate. If you specify only GSM without grade (SBS vs. FBB vs. recycled kraft), we will quote a grade assumption that may differ from your existing packaging family — and a mismatched surface finish shows up immediately on the printed proof, requiring a substrate change and a reprint.
Our standard timeline from complete brief to white sample is 7–10 working days. For a printed pre-production sample, 20–28 working days depending on print process and finishing complexity. Both timelines assume substrate is in our approved vendor inventory; if a new or custom substrate is required, add 10–15 working days for incoming qualification.
What file formats do you need for the die line, and does it have to be in a specific software version?
A vector PDF or Adobe Illustrator (.ai) file works for both. The die line must be on an isolated layer with cut, crease, and perf lines as separate named spot colours — not merged into the artwork layer. We accept Illustrator CS6 and above, and PDF/X-4 for print-ready files.
Can I get a quote without a final die line if I only have rough dimensions?
Yes, a budgetary quote based on envelope dimensions and a description of converting operations is possible — useful for internal budget approval before investing in a structural drawing. Treat it as ±15% accurate. A binding quote requires a confirmed die line and substrate spec.
Your timeline says 7–10 working days for a white sample. What would push it to the longer end?
Two things: tooling fabrication (if no existing die matches your dimensions, new flatbed tooling takes 4–6 working days on top of the sample lead time), and substrate availability. If the board you specify is not in our current stock, sourcing adds time. Tell us your substrate preference upfront and we can check inventory before confirming the timeline.
We received samples from three suppliers and the unit prices vary by nearly 40%. How do we know which quote is correct?
A 40% spread almost always means the suppliers are quoting different substrates, different die types (flatbed vs. rotary), or different inspection levels. Request a cost breakdown itemising substrate, tooling amortisation, converting, and finishing separately from each supplier. Once you normalise those four variables, the spread typically narrows to 8–15%.
At what point in the quote process should we be discussing packaging regulatory compliance — for example, food contact or recyclability requirements?
Before the brief, not after the sample. If your product has food contact requirements (e.g. EU Regulation 10/2011 for plastic components in food packaging, or FDA 21 CFR 176.170 for paper in contact with aqueous foods), the substrate selection and adhesive selection both change — and so does the supplier documentation we need to provide. Raising compliance requirements after sampling means requalifying the substrate and potentially rerunning the sample.
Planning a packaging project? Contact our team to request a complimentary specification review and sample quote.
