As a sales engineer for a flexo printing machine manufacturing company, I’ve spent the last seven years walking clients through every detail of their press installations, troubleshooting startup snags, and reviewing incident reports with industrial safety teams. Every week, I get emails from small-scale packaging printers who’ve just brought a used flexo press online and are asking the same question: “What do I need to do to keep my team safe?” It’s a valid question—flexo presses are powerful, precise machines, but like any industrial equipment, their biggest risk comes from rushed setup, skipped maintenance, or misaligned safety protocols. Flexo Printing Machine
Most flexo-related accidents I’ve seen over the years aren’t caused by machine defects. They happen because operators cut corners on simple, actionable steps that keep everyone in the press room protected. Let’s break down the critical safety precautions we outline for every client, from first-time operators to those upgrading their entire production line.
First, let’s talk about lockout/tagout (LOTO) procedures—this is the foundation of flexo press safety, and one that’s often skipped when a production line is running at full capacity. Flexo presses have multiple moving parts: anilox rollers, plate cylinders, impression drums, and web guides that can exert thousands of pounds of force if activated unexpectedly. A few years back, we worked with a snack packaging plant where an operator tried to clear a paper jam mid-run without locking out the press. The safety interlock switch on their old press was worn out, and when they reached into the nip point between the impression drum and a carrier roller, the machine cycled on automatically. The result was a crushed hand, four weeks of lost production, and a $12,000 workers’ comp bill.
The OSHA (Occupational Safety and Health Administration) standards for LOTO require that before any maintenance, clearing a jam, or changing a plate, the press’s power source is disconnected, a lock is applied to the disconnect switch (only accessible to the person performing the task), and a tag is attached stating “Do Not Operate.” For flexo presses specifically, you can’t stop at the main power switch—you also need to lock out the pneumatic supply line (which controls roller pressure) and the hydraulic unit if your press uses it. A lot of new operators think turning off the main display screen is enough, but that’s a common mistake; the hydraulic pump will still run in standby mode, and the rollers can engage if there’s a pressure buildup. We train every client’s maintenance team to test LOTO by trying to cycle the impression function twice before touching any moving parts—this small step eliminates 70% of unexpected startup incidents in our customer base.
Next, point-of-operation guards and their regular inspection. Flexo presses are designed with fixed guards around all nip points (the gap between two moving rollers), web paths, and gear drives, but these guards are only effective if they’re never removed or bypassed. I’ve seen some operators take off a guard to get a closer look at a plate cylinder alignment, then forget to put it back on when the production run starts. Last year, a label printer client told us an operator reached over a removed guard to adjust a register mark on a 6-color press, and their sleeve caught on the anilox roller, pulling their arm into the nip point. The guard was stored right next to the press, but the operator didn’t think to replace it because they were on a tight deadline.
The key here is to make guard access a documented process. Our machines come with tool-less guard removal only for approved maintenance tasks, and we require clients to log every time a guard is taken off, why, and when it’s reinstalled. We also add monthly guard inspections to our routine maintenance checklist for every machine we sell. Small tears in plastic guards, loose bolts on metal enclosures, or misaligned sensor triggers can turn a protective barrier into a hazard, so checking these parts every week isn’t optional—it’s a non-negotiable step.
Then there’s personal protective equipment (PPE), but not the generic “wear gloves and goggles” advice you’ll see on every safety poster. For flexo press operators, the right PPE depends on the task you’re doing. When you’re changing plates, for example, disposable nitrile gloves are a must to protect your hands from sharp plate edges and cleaning solvents, but they’re not appropriate when you’re operating the machine. Operators shouldn’t wear loose-fitting clothing, jewelry, or long neckties when the press is running—even a loose sleeve can catch on a web guide and pull you into the machine. We once had a client whose press operator wore a wristwatch that got caught on a roller, causing a sprained wrist and lost time for two days.
For cleaning tasks, the PPE changes too. Flexo presses use various solvents—ethanol, isopropyl alcohol, and specialized plate cleaners—that can cause skin irritation or respiratory issues if not handled properly. When wiping down the anilox roller or cleaning ink fountains, we require safety goggles to prevent splashes, nitrile gloves (latex doesn’t hold up to most flexo solvents), and a respirator with organic vapor cartridges if your press is in a poorly ventilated area. A lot of small shops don’t have dedicated ventilation for their presses, especially if they’re set up in a repurposed warehouse, so adding portable exhaust fans near the ink deck is a low-cost safety upgrade that prevents long-term respiratory problems.
Machine-specific training is another critical point that we emphasize with every client, and it’s not just a one-day orientation. Flexo presses are not one-size-fits-all: a 2-color narrow-web press for label printing has different operating procedures than a 10-color wide-web press for corrugated packaging. When we sell a machine, our service team does a hands-on training session for three operators, and we require that each operator has a written test on press-specific safety protocols before they’re allowed to run the machine alone. We also offer quarterly refreshers for clients who have high turnover in their press room teams.
A common mistake we see is operators using a universal press manual for a machine that’s 5 or 10 years old. Older presses might not have updated safety interlocks, so new operators might not know that a certain speed setting will disable a guard sensor, for example. Our team provides customized safety guides for every machine we deliver, outlining speed limits for tasks like plate changing, which sensors should never be bypassed, and emergency stop locations—emergency stop buttons, by the way, should be clearly marked with bright red covers and located within arm’s reach of every position on the press. We’ve had clients move an emergency stop button to a hidden spot to make the control panel look cleaner, and that’s a rule we immediately reverse; emergency stops aren’t for aesthetics, they’re for saving lives.
Ink and material handling safety is another area that’s easy to overlook. Flexo printing uses volatile inks, mostly water-based or solvent-based, and empty ink containers can still have residual fumes that are flammable. When storing ink drums, they should be kept in a cool, dry area away from the press, with no open flames or spark sources (like electrical switches) within 10 feet. A client in Ohio had a small ink spill near their press’s electrical panel three years ago; the fumes ignited, causing a small fire that destroyed two plate cylinders and caused $15,000 in damage. The fire department’s report said that the operator had stored a half-empty ink drum on the press’s loading dock, and a faulty switch near the press caused the spark.
For material handling, too—flexo web rolls can weigh 500 pounds or more, and moving them onto the press’s unwind stand without the right equipment is a major hazard. We require clients to use a hydraulic roll lifter or a pallet jack with a roll cradle to move large web rolls, and no operator should try to lift a roll heavier than 50 pounds manually. Improperly loaded rolls can fall, causing back injuries or crushing hazards, and we add roll loading training to every onboarding session for new press operators.
Preventive maintenance also plays a huge role in safety, not just uptime. A lot of clients only call our service team when the press breaks down, but worn parts can create safety risks. For example, worn clutch plates on the impression roller can cause sudden movement, and worn safety sensors can fail to detect a hand near a nip point. We recommend a bi-annual preventive maintenance check for every machine we sell, where our technicians inspect all safety interlocks, roller bearings, and emergency stop systems. We also send automated maintenance reminders to clients based on their machine’s operating hours, so they don’t forget to replace worn parts before they become a hazard.
One last tip that’s worked for our clients: a “safety stop” protocol for every team. If an operator feels uncomfortable with a press setting, or notices a loose guard, or sees a coworker doing something unsafe, they should be able to press the emergency stop button at any time without being reprimanded. We had a client a few years back where an operator stopped the press because they noticed a frayed web on the unwind stand— their manager almost told them to get back to running the press, but instead, they inspected the roll and found a tear that would have caused a web break and a possible injury. That small, open-door safety culture has cut incident rates for that client by 80% in the last three years.
At the end of the day, the safety of your press room team is the most important part of running a flexo printing operation. Every precaution we outline isn’t just a rule—it’s a way to make sure everyone goes home at the end of the shift, and that your production line runs smoothly without costly incidents. If you’re in the market for a new flexo printing machine, or you’re looking to upgrade your current press’s safety features, don’t hesitate to reach out to our team to discuss how we can customize a safety plan that works for your operation.
Raw Material References
OSHA. Lockout/Tagout of Hazardous Energy Sources. 29 CFR 1910.147
National Printing Equipment Manufacturers Association. Flexographic Printing Press Safety Guidelines. 2022
Occupational Safety and Health Administration. Personal Protective Equipment for Industrial Workers. 29 CFR 1910.132
Flexo Technical Association. Preventive Maintenance Protocols for Flexo Presses. 2021
Environmental Protection Agency. Safety Guidelines for Solvent-Based Ink Handling in Industrial Printing. 2020
Zhejiang Deguang Machinery Co., Ltd.
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