In automated manufacturing, adding UV disinfection to a conveyor line sounds straightforward: install several lamps above the belt and switch them on.
In practice, it is more complicated.
The actual UV dose depends on several variables at once: lamp power, distance to the product, conveyor speed, exposure time and the geometry of the installation.
A manufacturing plant in the Leningrad Region faced this problem while preparing its production process for stricter internal hygiene requirements.
The facility produces sanitary and medical products such as pads, dressings and wipes. Products move through automated conveyor lines before packaging, so the disinfection stage had to work continuously without slowing production.
The challenge
The technical team had considered several approaches, including air recirculators and ozone-based treatment.
The main issue was repeatability.
For the conveyor process, the plant needed a predictable UV dose on the product surface rather than general air treatment.
Several additional constraints had to be considered:
each production line required a defined UV dose;
available installation space was limited;
the equipment had to fit into existing conveyors;
UV exposure to personnel had to be prevented;
technical documentation was required for internal review and audits.
This turned the project into an engineering task rather than a simple equipment selection.
Different lines required different configurations
The plant used several conveyor sections with different dimensions, so one standard irradiator would not fit all of them.
Four conveyor UV units were therefore configured in different sizes and lamp arrangements.
Among the configurations used were:
a 810 × 200 × 410 mm unit with 3 lamps;
a more compact 150 mm configuration with 7 lamps.
The exact arrangement depended on the available space and the required irradiation conditions.
Calculating the UV dose
The important parameter was not simply total lamp power.
For a moving conveyor, the exposure time is determined by how long the product remains within the irradiated zone.
The calculation therefore had to take into account:
conveyor speed;
distance between the lamps and the product;
number of lamps;
UV output of each lamp;
length of the irradiated section.
For example, one of the project calculations used:
lamp-to-surface distance: 100 mm;
conveyor speed: 5 m/s;
calculated UV dose: up to 27.5 mJ/cm².
This illustrates why conveyor speed matters so much.
If the belt moves faster, the exposure time decreases. If the UV intensity remains unchanged, the delivered dose also falls.
The basic relationship can be expressed as:
UV dose = UV intensity × exposure time
For conveyor systems, exposure time is directly connected to belt speed and the length of the irradiated zone.
Lamp configuration
The conveyor sections used amalgam UV lamps with power up to 55 W per lamp.
Depending on the configuration, the total installed UV power reached up to 385 W.
Using several lamps also makes it possible to distribute irradiation across the conveyor width rather than concentrating the output in one area.
This becomes especially important when the product occupies a large part of the belt.
Separating the power electronics
Another part of the design involved separate control cabinets.
Instead of placing all electrical components directly on the conveyor section, the electronic ballasts were installed in dedicated cabinets.
The cabinet dimensions used in the project were approximately:
650 × 500 × 250 mm
The control system could include:
electronic ballasts;
lamp operating indicators;
runtime counters;
connections for remote monitoring.
This made the UV section itself simpler while allowing the electrical components to remain accessible for maintenance.
Protecting operators from UV exposure
Open germicidal UV sources cannot be treated like ordinary lighting.
If the lamps are operating near personnel, the irradiation zone needs to be physically isolated.
For this reason, protective screening was included in the design recommendations.
The shielding had two functions:
keep UV radiation inside the treatment zone;
prevent direct exposure of workers nearby.
This is particularly important on production lines where operators may regularly approach the conveyor.
Installation had to follow the production schedule
The equipment was delivered in stages.
The first control cabinet was supplied separately, while the conveyor UV sections were delivered as their housings were completed.
This made it possible to coordinate installation with the plant's existing production schedule rather than waiting for the entire system to be finished before beginning integration.
Technical documentation was prepared in parallel so that the equipment could also be included in the plant's internal documentation and audit procedures.
What this project shows
Conveyor UV treatment is less about choosing a powerful lamp and more about controlling the conditions around it.
A practical design has to combine several things:
enough UV intensity;
sufficient exposure time;
correct distance to the product;
suitable lamp arrangement;
shielding for personnel;
reliable power and control electronics.
If one of these parameters changes, the actual dose can change as well.
For automated production lines, this means the UV section should be treated as part of the process engineering rather than as a standalone device.
That is especially important when the conveyor speed, product height or line geometry may change over time.
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