Stage 01
Artwork intake
The workflow starts when a customer — typically a converter, or a brand owner working through a converter — sends artwork and a job request. Intake is deceptively consequential: nearly every downstream delay traces back to a job ticket that was missing a spec or a file that did not match what the customer described.
- Press and substrate — which press the plate will run on, web width, and material (film, paper, corrugated).
- Repeat and cylinder size — plate dimensions derived from the print cylinder.
- Color count and separations — process (CMYK) plus spot colors, with Pantone references.
- Anilox and line screen — these drive the screening decisions later.
- Plate type — digital photopolymer, gauge, flat-top vs. round-top dot.
- Due date — almost always tied to a scheduled press run, not a calendar target.
Weak intake creates rework downstream — waiting on approvals, chasing missing specs, or imaging plates that have to be remade. A structured digital job ticket, validated up front, is the single biggest lean improvement available at this stage.
Stage 02
Preflight & file preparation
Once the job is booked, a prepress operator opens the artwork and works through a preflight checklist that typically includes:
- Color mode set to CMYK, not RGB.
- Fonts outlined or included with the file.
- Placed images at 300 dpi minimum at final size.
- Bleed of at least 0.0625" beyond the die line.
- Spot colors named correctly (e.g.,
PANTONE 185 C) so they separate cleanly. - Customer traps removed — the trade shop traps to its own specifications.
- Small text on bitmapped images at 600 dpi.
File prep also includes distortion compensation (the plate will stretch when wrapped around a cylinder, and the file is scaled to compensate), barcode verification, and dieline alignment. ArtPro+, Esko DeskPack, and similar tools automate much of this — but human judgment still handles edge cases that automation flags but does not resolve.
Stage 03
Color management & screening
Color decisions happen here. The file is separated by ink, each separation is assigned a screening strategy, and a RIP converts the vector/raster data into the 1-bit TIFFs that will drive the plate imager.
- Screen ruling (e.g., 150 lpi) — matched to the anilox and substrate.
- Screening technology — conventional AM, stochastic FM, or hybrid screens like Esko Crystal screens or HD Flexo, which use patterned micro-cells in solids to improve ink laydown.
- Dot shape and minimum dot — minimum highlight dots of 1–2% are standard; anything smaller tends to blow out on press.
- Plate curves — compensation curves that pre-distort the tonal values so press output matches the proof.
A well-maintained color pipeline means the proof the customer signs matches what the press actually produces. A poorly maintained one produces press approvals that drift and remakes that erode margin.
Stage 04
Proofing & approval
Before any plate is imaged, the customer sees a proof. Most trade shops send a calibrated inkjet contract proof (inkjet paper plus ICC profiles that simulate the press condition) with a color bar and Pantone references embedded. High-end jobs also get a press proof or a physical mockup on the final substrate.
- Single source of truth — the approved proof is the reference for every downstream QC check.
- Approval capture — signed off digitally with a timestamp and the approver's name, not buried in an email thread.
- Revision control — when the customer requests a change, the old files are archived, not overwritten.
Approval loops are where deadlines slip. A customer who takes three days to approve a proof has just compressed the plate room's window from four days to one. Good MIS software makes this visible in real time so scheduling can react.
Stage 05
Step-and-repeat & plate layout
Once approved, the prepress operator assembles the final plate layout. On a single flexo plate you will typically find:
- Multiple up — the same design repeated across the plate to match the press repeat.
- Ganged jobs — unrelated small jobs combined on one plate to maximize yield (common in label work).
- Register marks, bearer bars, and microdots — non-printing elements the press operator uses to set up the job and the QC team uses later to verify the plate.
- Job and plate ID barcodes — for traceability through imaging, mounting, and archiving.
Good yield at this stage is a real margin lever. Software that nests automatically, respects color and substrate constraints, and writes the plate layout back to the job record saves both material and operator time.
Stage 06
Plate imaging & processing
This is the stage most people picture when they think "plate making." A modern digital flexo plate is produced through a sequence of physical steps, most of which run on specialized hardware:
- Back exposure — UV light hardens the bottom of the plate to set the floor depth.
- LAMS ablation — an infrared laser in a CTP device ( Esko CDI Crystal, Kodak Flexcel NX, and similar) burns the image into the black LAMS mask on top of the photopolymer.
- Main UV exposure — UV light passes through the ablated mask, hardening the polymer in image areas. LED-UV units like the XPS Crystal expose top and bottom simultaneously for consistent shoulder angles.
- Washout — unhardened polymer is washed away (solvent, water, or thermal, depending on plate type).
- Drying — plates are dried to drive off solvent or residual moisture.
- UV finishing — UVA and UVC light detackify the plate and lock in surface properties.
Esko reports that consolidating imaging and exposure can cut manual steps by 50%, errors by 50%, and operator time by 73% — an indication of how much of the traditional plate room process was operator-dependent material handling.
Stage 07
Plate QC & finishing
Before a plate leaves the building, it gets inspected. Typical checks:
- Dot measurement — a plate analyzer (X-Rite, Flexo3, Esko) measures dot percentages in the control patches and compares against the target curve.
- Visual inspection — operator examines the plate under magnification for pinholes, scumming, or ablation defects.
- Dimensional check — plate is cut to the press specification (corner cuts, notch locations, back marks) and measured.
Bad plates caught here cost a trade shop the plate material and an hour of rework. Bad plates caught on press cost the converter press downtime, wasted substrate, and a damaged relationship. QC is cheap insurance — but only if the plate analyzer data is captured against the job record, not written on a sticky note.
Stage 08
Delivery & billing
Finished plates are packed (typically sleeved and boxed, sometimes pre-mounted on sleeves for the converter), labeled with job and plate IDs, and shipped or couriered to the converter's plant. Plates for a scheduled press run are almost always rush — a late plate is a stopped press.
Billing in flexo prepress is distinctive. Unlike hourly shop work or per-unit manufacturing, plates are typically billed by area — square inch or square centimeter of imaged plate, sometimes with a separate rate per color and per substrate class. A typical invoice line includes plate area × rate for that plate type, file prep and artwork charges, proof charges, rush fees where applicable, and shipping. Capturing plate area accurately off the step-and-repeat layout — not re-measured by hand — is where an MIS earns its first month of subscription.