TL;DR: A poorly structured sample request is the single most common reason flexo jobs take 3–4 quote rounds instead of one — fix the brief, not the supplier.
TL;DR: Sending artwork at below 300 DPI or without a 3mm bleed adds an average of 5–7 working days to your sample timeline before press-ready files are even approved.
What to Prepare Before You Contact Any Flexo Supplier #
Most delays in flexo sampling happen before the supplier touches a plate. The brief arrives incomplete, the supplier asks follow-up questions, the brand contact is in a different time zone, and a week disappears. Avoid that cycle by assembling these elements before your first contact.
Artwork files. Flexographic printing requires vector-based artwork in PDF/X-1a or AI format. Raster elements embedded within the file must be at minimum 300 DPI at final print size — 600 DPI is preferable for fine halftone work below 60 lpi. Supply a bleed of at least 3mm on all cut edges. Spot colors must be called out as named Pantone references (e.g., PMS 286 C, not “dark blue”) because flexo ink mixing is formula-driven. If you’re working to G7 color accuracy standards, flag that in your brief — it affects our plate curve compensation and press setup.
Structural dimensions. Provide finished dimensions in millimeters: length × width × height for boxes, flat reel width and repeat length for flexible pouches or roll-stock. If you have an existing package, a physical sample or a technical drawing with tolerances is worth more than a verbal description. Material preference — whether that’s LDPE film, OPP, kraft paper, or corrugated liner — should be stated even if you’re open to alternatives.
Quantity tiers. Give us at least two quantity scenarios: your realistic launch volume and your expected steady-state reorder volume. Flexo economics shift significantly between 50,000 and 500,000 units because plate amortization is a fixed cost spread across the run. We need both numbers to build a quote that reflects your actual cost trajectory, not just a single price point.
The Three Sample Types and What Each One Tells You #
| Sample Type | What It Confirms | Typical Lead Time | Cost Implication |
|---|---|---|---|
| White / unprinted structural sample | Die shape, dimensions, fit on product | 5–8 working days | Usually free or nominal tooling cost |
| Printed digital proof (off-press) | Color intent, layout, text legibility | 3–5 working days from approved artwork | Low; no plate cost |
| Production flexo sample (press-run) | Actual ink density, registration, substrate adhesion | 15–22 working days from artwork approval | Plate cost applies; typically $300–$800 USD for a standard 4-color job |
White samples tell you whether the structure works. Order one before committing to print tooling — a box that doesn’t close properly costs far less to fix at this stage than after plates are made. The printed digital proof is useful for internal sign-off but do not use it to approve Pantone accuracy; digital proofing systems simulate flexo color, they do not replicate it. Only the production sample, pulled from an actual press run on the actual substrate, is valid for final color and adhesion sign-off.
Our standard production sample run uses the same anilox volume and ink formulation that will run in production. We document the press settings — impression pressure, anilox BCM, ink viscosity at point of use — under our internal form SR-04 (Sample Run Record) so that the production job is dialed in from those confirmed parameters rather than reset from scratch.
How to Evaluate What Arrives in the Sample Box #
When your production sample arrives, check these points systematically rather than just eyeballing the color.
Color: Compare against your Pantone swatch under D50 illuminant (standardized in ISO 3664 for graphic arts viewing). A Delta E of 3.0 or below against the target is acceptable for most brand applications; premium brand standards typically require Delta E ≤ 2.0. If the sample was produced without a calibrated viewing condition, the color assessment is not reliable.
Registration: Measure the misalignment between color separations at a corner or fine rule element. Flexo register tolerance on our CI (central impression) press is ±0.2mm under controlled conditions. If you see a visible halo on fine text at 6pt or smaller, that is a registration issue worth flagging — it will not self-correct in production.
Adhesion and scuff resistance: Run a fingernail across the printed surface and across a sealed edge. Ink that transfers to your finger indicates undercure or the wrong overprint varnish. For food-adjacent applications, check that the supplier references EU Regulation No 10/2011 or FDA 21 CFR §175.105 compliance on the ink declaration — this should come with the sample, not only on request.
Why Quotes Don’t Match and How to Compare Them Fairly #
You send the same brief to three suppliers and get three quotes that differ by 40%. Before assuming the cheapest one is suspicious or the most expensive one is premium, check whether they’re quoting the same scope.
Plate costs are the most common hidden variable. Some suppliers amortize plates into the unit price; others invoice them separately. Ask every supplier to break out plate cost, tooling cost, and unit cost as three separate line items.
Substrate specification is the second gap. “BOPP film” in one quote might be 30 micron; in another it might be 20 micron. A 10-micron difference in film gauge affects both barrier performance and cost by a measurable margin. Require each supplier to state the substrate grade and caliper in their quotation response.
Run waste and setup sheets are a third variable that most quotes bury in the fine print. Our standard startup waste allowance is 500–800 linear metres for a flexo reel job — this is consumed during impression setup and cannot be eliminated. Some quotes exclude this from their stated quantity; others include it. Clarify before you sign off.
Finally, check ink system declarations. Water-based and UV-flexo inks are not interchangeable for all substrates, and a quote switching ink systems without flagging it has changed more than the price.
Prevention — What to Specify Upfront to Avoid Requotes #
In the PO or supplier brief, lock in: substrate grade and caliper, finished dimensions with tolerance (±1mm is standard for flexible pouches; ±0.5mm for precision-fit rigid liners), color references as named Pantone numbers, sample type required before production approval, and quantity tiers with expected reorder frequency. If the application has food contact or child safety requirements, state the applicable regulation by number. Request the supplier’s plate specification sheet and a copy of their ink declaration certificates before sampling starts. These two documents close more requote loops than any other single measure.
Specification Notes for Brand Partners #
When you brief us on a flexographic print job, the information that makes the biggest difference to quote accuracy is substrate specification and quantity tier — in that order. A brief that says “flexible pouch, kraft look, around 10,000 units” gives us almost nothing to price from. A brief that says “100 micron kraft-laminated BOPP, 160mm × 240mm flat pouch, 10,000 units at launch with expected monthly reorders of 8,000” gives us everything.
The most common brief gap we see is missing bleed and safe-zone dimensions on artwork. Designers familiar with offset or digital printing often supply 1.5mm bleed; flexo cutting tolerances require 3mm minimum on most substrates. When we receive files with insufficient bleed, we can sometimes extend background colors in prepress, but if your design has a hard graphic element near the edge, that requires a design revision — and that revision adds a minimum of 3 working days to the sample timeline.
Our typical timeline from approved artwork and confirmed substrate to production sample delivery is 18–22 working days. Jobs with custom substrate sourcing or multi-layer lamination structures run 25–30 working days. Expedited sampling (12–15 working days) is possible on standard substrates when plates are uncomplicated, but we do not commit to that timeline until we review the artwork complexity.
Frequently Asked Questions
Do I need to send physical artwork files or can I share a Google Drive link?
A shared link is fine for the initial review, but production files must be submitted as PDF/X-1a or layered AI with fonts outlined. We run a preflight check on every file against a minimum 300 DPI resolution requirement before routing to prepress. If files don’t pass preflight, we return them with a marked-up report rather than guessing at your intent.
Can I get a sample before committing to a full quote?
Yes — a white structural sample typically has no plate cost and we often provide it to confirm dimensions before finalizing print tooling. For a printed production sample, plate cost applies regardless of whether you proceed to a production order. For a 4-color standard job this is typically in the $300–$800 USD range and is credited against the production order on jobs above 50,000 units.
My brand requires Pantone accuracy. How do I know the sample will match in production?
The production sample is the only valid approval point for Pantone accuracy in flexo — a digital proof confirms layout, not color fidelity on substrate. We measure Delta E against your target under D50 illuminant per ISO 3664. If the first production sample reads Delta E above 3.0, we adjust ink mix and reprint before shipping for approval. That iteration is included in our standard sampling scope, not invoiced separately.
If I change quantity after sampling, do we need to resample?
A quantity change alone doesn’t trigger resampling. But if the quantity change moves you from one substrate batch to another (which can happen when minimum reel quantities differ between grades), we flag that under our SR-04 record and assess whether a substrate verification print is needed. Usually it isn’t, but we won’t skip the check.
How do I know if a supplier quoting 30% cheaper than others is cutting a corner?
Ask them to itemize: plate cost, substrate grade and caliper, unit price, and startup waste allowance. If they can’t or won’t break those four items out separately, the price comparison is meaningless. A lower unit price built on a thinner substrate gauge or excluded plate amortization isn’t a saving — it’s a scope difference.
Planning a packaging project? Contact our team to request a complimentary specification review and sample quote.
