Last updated: October 2026
Quick answer: Buy a flexo CTP imager when your plate volume and remake costs justify bringing plate making in-house. Choose it by plate format and thickness range, the digital plates and screening you plan to use, and the exposure, washout and drying line around it. Confirm everything on the machine specification sheet and with trial plates before ordering.
Key takeaways
- An imager is one part of a plate-making line; plates, UV exposure, washout, drying and finishing decide the final dot.
- Match plate format and thickness range to your presses and plate mix, not to the largest machine available.
- Run trial plates through the whole line before you commit.
- Flexo imagers and flexo plate processors we offer are supplied with our partner factories; the flexo plates come from our own factory.
A flexo imager, often called a flexo CTP, changes how a packaging printer or trade shop works: plates are made in hours on site instead of waiting for an outside plate maker. It is also a significant investment, and buyers sometimes treat it as “just a laser machine”. This guide walks through the decisions in the order we see work best. For background on the process, read how flexo plates are made.
What a flexo CTP imager does
Digital flexo plates carry a thin black mask layer on top of the photopolymer, known as the LAMS layer (laser ablation mask). The imager’s laser removes this mask where the image should be, replacing film. The plate then goes through UV exposure, washout, drying and finishing in the plate processor line. The imager decides how accurately the mask is opened; the rest of the line decides how that image becomes relief and dots. That is why digital flexo plates, the imager and the processor must be chosen together.
Should you buy an imager or outsource plates?
| Criterion | Own flexo imager | Outsourced plates |
|---|---|---|
| Turnaround | Same-day remakes possible | Depends on the trade shop and transport |
| Control | You control screening, curves and plate choice | Plate maker controls the process |
| Investment | Imager, processing line, room, training | None; cost is in each plate |
| Skills needed | Flexo prepress and plate-making operators | Prepress files only |
| Best fit | Steady plate volume, frequent remakes, many SKUs | Low or irregular volume |
Common reasons to buy: outsourced plates take too long to arrive, remakes cost press time, or you want control over your own plate making. Honest reasons to wait: “we do not have enough plate volume”, or “our operators have no flexo prepress experience”. Both are fixable, but they belong in your plan. Our analog vs digital flexo plates comparison helps if you are still on film.
Plate format and plate thickness range
Size the imager to your largest press plate plus a margin for mounting, and to the thickness range of the plates you run. Standard flexo gauges are 1.14 mm, 1.70 mm, 2.28 mm, 2.84 mm, 3.94 mm and 6.35 mm. Label and flexible packaging work mostly uses the thinner gauges, while corrugated postprint uses thick plates. Not every imager configuration handles every gauge, so a shop that says “our imager cannot handle thick corrugated plates” usually bought without checking the specification sheet. See our flexo plate thickness guide and corrugated flexo plates for typical choices.
The largest imager is not always the best choice. Plate format and thickness range should match your presses, sleeves and plate mix. A bigger drum means a bigger exposure unit and washout unit, more floor space and more plate waste if you mostly run narrow jobs.
Plates, screening and dot shape
Consistent dots from plate to plate depend on the plate, the imaging settings and exposure control together. Points to discuss with the supplier:
- Plate compatibility. Confirm the imager images the LAMS plates you plan to run, and test them. An imager should not lock you into one plate supplier; trial plates prove it.
- Dot shape. Round-top and flat-top dots behave differently on press. Flat-top dots need suitable plates or exposure methods; see flat-top vs round-top flexo dots.
- Screening and curves. The RIP applies screening and dot-gain compensation; plan time for press fingerprinting.
- Processing type. Solvent, water-wash and thermal-processing plates need different processors. Water-wash plates are not for UV inks, so match the plate to your ink system.
Resolution, imaging speed and laser details vary by configuration. We do not quote them here; they are on the machine specification sheet for the configuration you are offered.
The rest of the plate-making line
An imager without a matched processing line does not make plates. Plan these units at the same time:
- Back and main UV exposure unit, sized to the imager format.
- Washout unit for your plate type (solvent, water or thermal).
- Dryer and light finishing / post-exposure unit.
- Plate cutting, mounting tools and storage.
- Room ventilation, water or solvent handling as the processor requires.
The flexo plate processors we offer, like the imagers, are supplied with our partner factories. We can also supply sleeves, mounting tape and anilox rolls, which simplifies sourcing for a new line.
Flexo imager buyer’s checklist
| Check | What to confirm |
|---|---|
| Maximum and minimum plate size | Covers your largest press plate with mounting margin |
| Plate thickness range | Covers every gauge you run, including thick corrugated plates |
| Plate types | Images the LAMS plates you plan to use; trial confirmed |
| RIP and screening | Accepts your files; supports the screening you need |
| Processing line | Exposure, washout and drying matched to format and plate type |
| Site requirements | Power, earthing, room climate, ventilation, compressed air if needed |
| Installation and training | Who installs, trains and runs acceptance tests |
| Service and spare parts | Response route, remote support, parts availability |
Risks and how to reduce them
- Underused machine: calculate plate area per month first; if volume is low, outsourcing may still win.
- Plate quality issues: request trial flexo plates and run them on your press with your inks.
- Specification gaps: get the specification sheet in writing and compare it with your plate list.
- Installation delays: prepare the site with our machine installation checklist.
- Transport damage: agree on export crating and insurance; see shipping and packaging.
What to send for a quote
For an accurate quotation, send: press list with plate sizes and repeat lengths, plate thicknesses, ink systems (solvent, water-based, UV), monthly plate area, the plate types you run today, your file workflow, room size and destination port. MOQ, lead time and price are confirmed in the quotation. Browse the flexo CTP machines we offer for an overview.
FAQ
What is a flexo CTP imager?
It is a laser machine that removes the LAMS mask on digital flexo plates to create the image, replacing film. The plate is then exposed, washed out, dried and finished.
What size flexo imager do I need?
Choose a format that covers your largest press plate plus mounting margin, and a thickness range that covers every gauge you run. Check both on the machine specification sheet.
Do I need a plate processor with a flexo imager?
Yes. After imaging, the plate needs UV exposure, washout, drying and finishing, so plan the processing line together with the imager.
Can a flexo imager image corrugated plates?
Some configurations handle thick corrugated plates and some do not. Confirm the thickness range on the specification sheet before ordering.
Should I buy a flexo imager or outsource plate making?
Buy when your plate volume, remake frequency and need for control justify the investment and training. With low or irregular volume, outsourcing is often cheaper.
Planning in-house flexo plate making? Request a quote — send your press list, plate sizes and thicknesses, inks and monthly plate area. Or request trial plates / contact us.
Disclaimer: values on this page are typical and for reference only; final specifications, MOQ, price and lead time are subject to the grade TDS and the quotation.
