Setting up the room: power, dust, temperature and humidity

Most machines that disappoint were installed badly rather than built badly. The room decides how the printer behaves — and almost every requirement is published by the manufacturer, then ignored. Here is what to sort out before delivery.

The three-phase myth

Buyers routinely assume a wide-format flatbed needs a three-phase connection. Look at what the machines actually draw:

• Mimaki JFX200-2513 — under 2.88 kVA, single phase
• Mimaki UJF-3042 MkII e — 1,000 W or less
• Roland LO-640-F3 — 230 V, 16 A, about 2.90 kW
• Roland MO-240 — about 290 W
• Roland EU2-1000MF — 220 V, 32 A, about 5,900 W

What these machines need is not three phase. It is several independent single-phase circuits. The Mimaki JFX600-2513 wants three separate 24 A feeds; the JFX200-2531 wants two. That is a distribution-board question, and it is the one most often got wrong — a single circuit shared with a compressor and the shop lights will trip or sag under load.

On stability, the manufacturers converge on ±10% voltage tolerance. That is the figure a stabiliser has to hold, and it is the number to specify when you buy one.

One more electrical point with a direct cost attached: these machines must not simply lose power. Cutting the mains before the head parks and caps can dry and clog nozzles — see the maintenance schedule. A UPS sized to park the machine safely is cheaper than a printhead.

Two temperature ranges, and the one that matters

Mimaki publishes something most manufacturers do not: two separate bands. One for operating, one for guaranteed accuracy.

A shed at 34 °C is technically “running” and definitively outside registration specification. The machine will print. It will not hold registration, and you will spend the difference chasing alignment faults that are actually a thermometer problem.

There is also a rate limit: maximum ±10 °C change per hour. That rules out the common practice of switching the air conditioning off overnight and slamming it on at nine in the morning. If you air-condition the machine hall, do it gently and continuously.

Why 35% humidity is a floor, not a suggestion

The lower humidity bound exists because of static. The ESD Association’s measured figures make the case better than any argument:

A twenty to forty-fold difference. For context, printhead electronics are typically protected to around 2 kV — a figure the dry-room column exceeds many times over.

And static does not only threaten electronics. Mimaki: “Static electricity attracts mist and dust around the printing area and the head.” A dry room actively pulls contamination onto the nozzle plate — the second of the two failure modes in what kills a printhead.

Dust: there is an actual specification

Mimaki publishes a dust requirement, which is unusual and worth quoting when someone proposes putting the machine next to the cutting table: dust environment “similar to standard office environments” or “equivalent to a general office floor level.”

Not a workshop. Not a shed with the shutter open. An office.

Mimaki also rules out certain atmospheres entirely: do not use the machine “in an environment full of metal cutting fluids or materials containing highly volatile substances (amines, amine-denatured alcohols).” If you run a CNC or a laser in the same hall, that is a partition, not a preference.

Floor and load

Published weights, before anything is on the bed:

• Roland EU2-1000MF — 1,300 kg
• Mimaki JFX600-2513 — about 1,200 kg
• Mimaki JFX200-2531 — about 1,000 kg
• Roland LO-640-F3 — 920 kg
• Mimaki JFX200-2513 — 650 kg

Then add media. The JFX600 and JFX200-2531 both specify a maximum media weight of 50 kg/m². Across a 2.5 × 3.1 m bed that is another 390 kg. A loaded JFX600 is over 1.5 tonnes.

That is a real question for a first-floor installation, and a real question for the route in. Our machine pages publish both machine and crate dimensions for exactly this reason — the crate has to get through the door before the machine can stand in the room.

Storing and acclimatising board

Two Mimaki instructions worth following. Store sheet so that it bends downward — “media bent in an upward direction may not adhere to the table”, and a sheet the vacuum cannot hold is a head strike waiting to happen. Surface unevenness should be 0.5 mm or less.

And acclimatise for at least 30 minutes after opening. Moving board from a hot yard straight onto a cool bed gets you condensation and dimensional movement mid-job.

Pollution control: the threshold nobody mentions

This is India-specific, current, and almost unknown among buyers.

The CPCB’s classification list puts digital printing on flex, vinyl or PVC with fewer than five machines in the White category (pollution index 20.0). With more than five machines it becomes Green (index 46.0).

That matters because White-category plants are exempt from obtaining consent — subject to the condition that the plant informs the State Pollution Control Board in writing. Green requires consent.

So under five machines is a written intimation to your state board. Buying a fifth machine can change your regulatory category. It is a hard, gazetted threshold, and the schedule was substituted as recently as October 2025 — so confirm the current position with your state board rather than relying on this or any other article.

Safety: UV ink is a skin problem, not a fire problem

Worth correcting a common assumption. UV ink is generally not a flammable liquid — Mimaki’s LUS-150 safety data sheet lists flash point as “not applicable.” Eco-solvent ink is different: Mimaki SS21 has a closed-cup flash point of 71.1 °C and is classified as a combustible liquid.

The real UV hazard is dermal. European printing-ink industry guidance lists skin corrosion, irritation and — the one that matters — H317, allergic skin reaction. Their key warning:

“Since energy-curing products are not corrosive, their presence on the skin may not be immediately noticed.”

It does not sting, so nobody washes it off, and sensitisation is cumulative and permanent. Once an operator is sensitised to an acrylate, they are sensitised for good.

Specified handling:

• Single-use, disposable, non-powdered nitrile gloves, worn for no more than 30 minutes
• For longer contact, a minimum 0.45 mm thickness rated up to four hours
• Limit ketones near gloves — “they may accelerate glove deterioration”
• “Never use solvents to remove UV/EB products from the skin” — use hand paste or liquid soap

That last one is worth putting on the wall. Washing ink off with thinner is common and precisely wrong: it drives the acrylate into the skin.

What it costs to run, in Gujarat

A structural point most buyers do not know: Gujarat’s low-tension tariff has no “industrial” category. A print shop is billed as Non-RGP (up to 40 kW) or LTMD (above), the same as any commercial premises. There is no cheaper industrial LT slab to ask for.

For planning, the state regulator’s own approved average billing rate for FY 2026-27 is about ₹6.77 per unit.

The actionable part is time of use. The tariff carries a discount of 60 paise per unit between 11:00 and 17:00, and a peak surcharge of 45 paise during 07:00–11:00 and 18:00–22:00. Moving long flatbed runs into the middle of the day is worth ₹1.05 per unit against peak — roughly 14% on the energy line. It requires a time-of-day meter, so raise it with your discom before installation rather than after.

Feed the resulting figure into the payback calculator, and check the current tariff order yourself — these are revised annually.

What we could not verify

We are not publishing an earth-resistance figure in ohms. No obtainable manufacturer installation guide states one, and the values circulating online are unsourced. Ask your supplier for the installation manual’s earthing requirement in writing, and have a licensed electrician certify it.

Similarly, the “±6% under CEA regulations” figure is widely quoted and we could not read it from the regulation itself. Use the manufacturer’s ±10% — it is verified, and it is what your warranty will be judged against.

One useful negative finding: these machines generally do not need compressed air. Mimaki’s JFX600 uses blower adsorption; Roland’s flatbeds list no compressed-air requirement. Compressed air appears on larger industrial flatbeds only.

The pre-delivery checklist

• Independent circuits, correctly rated, on their own breakers
• Stabiliser holding ±10%, and a UPS that can park the head
• Air conditioning sized for 20–25 °C, running continuously
• Humidity between 35% and 65%, measured not guessed
• Office-grade dust; cutting and routing partitioned off
• Floor rated for machine plus media; route in measured against the crate
• Written intimation to the state pollution board
• Nitrile gloves and hand cleaner on site before the ink arrives
• Time-of-day meter discussed with the discom

Sorting this before delivery costs a fraction of what it costs afterwards. If you are still at the planning stage, how to start a printing business covers the order of decisions, and a quote request will get you the specific power and footprint figures for the machine you are considering.

Sources

• Mimaki specification pages — power, operating and accuracy-guaranteed temperature ranges, humidity, dust environment, prohibited atmospheres, media weight and flatness, acclimatisation, static and dust
• Roland DG specification pages — power draw, environmental range, weights
• ESD Association — static generation against relative humidity
• CPCB, Sectors Classified list — digital printing on flex/vinyl/PVC, White and Green thresholds; MoEFCC gazette notifications on White-category exemption
• Mimaki safety data sheets — LUS-150 UV ink and SS21 eco-solvent flash points
• EuPIA, Safe Handling guidance for UV and EB inks (2024) — hazard statements, glove specification, skin-cleaning instruction
• GERC tariff order for FY 2026-27 — LT categories, approved average billing rate, time-of-use rebate and peak surcharge