Energy has moved to the centre of manufacturing decision-making in a way that would have seemed unlikely a decade ago. Volatile electricity prices, carbon reporting obligations, sustainability commitments to investors and customers, and the growing cost of energy-intensive production processes have all combined to make energy efficiency a genuine competitive variable — not just an environmental aspiration.
For companies operating surface coating and metallization lines, this shift has prompted a closer look at the actual energy profile of their production processes. The differences between technologies are significant, and understanding them in concrete terms is increasingly important for anyone evaluating a capital investment in new coating equipment.

How conventional coating systems use energy

Traditional spray coating lines — whether solvent-based or water-based — consume energy across several distinct process stages, many of which are thermally intensive. Spray booths require climate control to maintain the temperature and humidity conditions necessary for correct coating application and film formation. Drying ovens, which cure solvent-based coatings by evaporating the carrier and cross-linking the film through heat, operate continuously at elevated temperatures and represent the largest single energy draw in a conventional line.
Exhaust and abatement systems add further load. Solvent-laden air extracted from spray booths and drying zones must be treated before release — typically through thermal oxidisers or activated carbon systems — which themselves consume significant energy. The net result is a production system in which energy consumption is distributed across multiple pieces of auxiliary equipment, making it both difficult to measure accurately and difficult to reduce without compromising process performance.
Industry figures for conventional solvent-based coating lines in packaging applications commonly place total energy consumption in the range of 150 to 200 kWh per operating hour, depending on line configuration, throughput and the specific coating system in use. This baseline is the relevant comparison point when evaluating the energy profile of inline UV coating and metallization systems.

The energy profile of inline UV metallization

UV-curable coating systems operate on a fundamentally different energy model. Instead of thermal curing, UV coatings are cross-linked almost instantaneously by exposure to ultraviolet light — a photochemical process that requires a fraction of the energy of oven curing and generates no solvent emissions that require abatement. The UV lamps themselves consume energy, but their output is targeted and immediate: there are no large thermal masses to heat and maintain, no continuous oven temperatures to sustain and no exhaust treatment systems to power.
The vacuum sputtering stage, which deposits the metallic layer, operates within a chamber that has already been evacuated — a process that requires energy for the initial pump-down but runs at relatively low continuous power once the deposition conditions are established. The absence of liquid chemical systems means there are no heated baths, no agitation systems and no effluent treatment requirements.
Tapematic documents the energy consumption of its PST Line II at 60–70 kWh per operating hour — a figure that reflects the combined load of UV coating, sputtering and the automated transport and control systems that manage the inline process. Against the 150–200 kWh baseline of conventional coating lines, this represents a reduction of roughly two thirds in energy consumption for equivalent production throughput. For a medium-sized operation running a coating line on a two-shift basis, the annual energy saving this differential represents runs to figures that are commercially meaningful in their own right, quite apart from any carbon accounting benefit.

What the comparison means in practice

Raw energy consumption figures are useful, but the practical implications of this differential go further than the electricity bill. Lower energy consumption means lower heat generation within the production environment, which reduces the cooling load on the facility's climate control systems. It means fewer auxiliary systems — no thermal oxidisers, no solvent recovery units — which reduces both capital expenditure and maintenance requirements. And it means a simpler, more transparent energy audit trail for companies with carbon reporting or sustainability certification obligations.
The footprint implications are also relevant. A conventional coating line with its associated oven, exhaust treatment and climate control infrastructure occupies considerably more floor space than an inline UV and sputtering system producing equivalent output. For manufacturers operating in facilities where space is constrained — or where expansion is costly — this difference in physical footprint has a real economic value that does not appear in a simple energy comparison.

Matching the benchmark to the production context

Energy benchmarks are most useful when they are evaluated in the context of actual production conditions rather than theoretical specifications. The energy consumption of any coating line varies with throughput, cycle time, product changeover frequency and the specific coating system in use. A line running at full capacity on a single product format will have a different energy profile from the same line running mixed production with frequent changeovers.
For manufacturers considering a transition from conventional coating to inline UV metallization, the most reliable way to establish a meaningful energy comparison is to model both systems against their actual production schedule — taking into account not just the line itself but the auxiliary systems, facility conditioning and maintenance overhead that the full operational picture requires. The resulting comparison will typically show an energy advantage for inline UV systems that is even more pronounced than the headline figures suggest.