Navigating a world where species, labor costs, and mill traditions vary wildly, sawmill engineers are embracing flexibility as their core design principle.
Writer: Asa Butcher
Global sawmills move astonishing volumes of timber, yet the logic that governs a mill in Finland rarely maps cleanly to one in France, North America, or Japan. Species, dimensions, labor economics, and even cultural expectations change the rules.
Performance hinges on adapting to those rules rather than exporting a template. That is the operating principle at Jartek, a family-owned Finnish engineering firm established in 1957, employing about 60 specialists with an annual turnover in the €30–40 million range and projects delivered in more than 20 countries.
Flexibility as an operating principle
TMW expands and contracts up to 60% less than regular, untreated wood. That means it’s much more stable when the weather changes, and less likely to warp, crack, or shift. Untreated wood can swell or shrink noticeably with moisture, which can lead to problems over time.
“TMW’s stability comes from a special process that uses just heat and steam (no chemicals) to change the wood’s structure. This makes it absorb far less water and keeps it in shape, even in places with extreme humidity or dryness, like the rainy Pacific Northwest or the arid Southwest,” says Tomi Vainikka, Quality and Development Manager, at Jartek. “It’s a smart choice for things like cladding, decking, and window frames, where long-term durability really matters,” he adds.
Jartek’s leadership is explicit: success starts by listening, not imposing. VP of Sales Kari Puustinen explains, “There is no joint Nordic concept – even Finland and Sweden have different layouts. Every country has its own way of processing logs and lumber because of how the forest looks and what they want to sell.” The default is heavy tailoring, not light customization.
Priorities also shift by market. In the Nordics, high labor costs push lines toward speed, efficiency, and lean staffing. In parts of Central Europe and North America, legacy processes and different labor dynamics have historically kept more manual work in the flow, although automation is rising there too. Jartek’s stance is to accommodate both ends rather than champion a single doctrine.
CTO Heikki Laaki reinforces that trust precedes technology: “The first challenge is understanding the thinking behind what the customer wants to achieve. Only then can we move to technical questions.” That understanding is built through frank discussions, site visits both ways, and the credibility of references delivered on schedule.
Strategically, CEO Juho Luoranen frames strategy entry as selective and controlled: “Profitable projects and controlled growth require careful market studies and selective entry.” In 2025 alone, Jartek opened five new market areas. “We want to show we can work internationally, but not by chasing volume. It’s about resilience and precision.”
Designing for difference: lumber handling in practice
The global contrasts in drying-stack logic show how local requirements shape engineering. For example, in Finland, Scandinavian practice allows mixed-length stacks; every second board is even-ended left and right, stacks are stored and moved on wagons, and traverse distribution feeds thermal chambers efficiently.
By contrast, France often runs “one-length” stacks, with lengths from 2.5 to 6 m. Layers are spread to create small gaps, storage sits outside, and forklifts manually deliver stacks to different kiln types. “The French project was a good example of tailoring,” Puustinen recalls. “It was connected to an old line, and the customer said, ‘We want it like this.’ So we built the layout based on that.”
North America adds another twist: cutting often happens before sawing, producing fixed-length stacks that allow simpler equipment and sometimes higher speeds. “In Scandinavia, we cut after sawing,” Luoranen notes. “That means mixed lengths in drying stacks and more complex sorting later.” Jartek’s role is to implement either path without forcing a “Finnish way.”
Because many projects are brownfield, modularity and retrofit capability are essential. Over the past 15 years, Jartek has delivered more than 100 lumber-handling solutions – including complete dimension-sorting lines, complete grading lines, and modernization programs – integrating with existing assets to lift capacity and uptime without ripping out entire plants.
Automation, digitalization, and reliability
“Without intelligent automation, even the best mechanics are just cold steel,” says Laaki, who explains what that means in practice: “Automation level starts with yearly capacity. If you aim for 100,000 cubic meters, maybe you accept more manual work. If you aim for 750,000, you invest in automation. We can scale both ways because we have our own automation department.”
Predictive maintenance and intelligent safety zones are part of that design. “Safety without production interruptions is tricky,” Puustinen admits. “You can make a safe system that’s almost impossible to work with. Combining ergonomics and safety is the challenge.”
Digitalization is also reshaping mill logic. “Automation and AI will make sawmills smaller and more adaptable,” says Laaki. “We’re already implementing technologies that help production planners react faster to changing market demands.”
Platform continuity matters globally. “Our automation platform is based on Beckhoff technology,” Laaki explains. “It’s a German system with production facilities in the Americas and Asia. That global footprint ensures hardware supply chains remain accessible worldwide, so customers never have to worry about spare parts being flown in from Finland.”
Thermal modification and strategic growth
Thermal modification is a core lever in Jartek’s portfolio. The company is a world market leader in ThermoWood® equipment with nearly 100 delivered chambers, standardized capacities, and solutions for electricity, oil, or gas.
Its global experience runs deep: deliveries span Europe, Asia, Oceania, and now North America, with therma modification recipes tuned across more than 200 wood qualities. That maturity simplifies international work, while still allowing adjustments for species, energy sources, and site practices.
Market trends reinforce the investment. “Replacing tropical hardwoods with thermo-modified wood and increasing wood construction are megatrends,” Luoranen says. “They guarantee projects for the future.”
Jartek’s growth model balances reliability with innovation. The company prefers to introduce only a limited number of mechanical changes per large project and to push more novelty into software, so customers gain improvements without compromising proven hardware. That conservatism is intentional: deliver what you know works, then layer smart upgrades.
Global sawmilling isn’t about selling a Finnish way or an American way; it’s about engineering what your logs, layouts, labor, and products demand. As Puustinen puts it: “Listening beats imposing.” And as Luoranen reminds us: “Controlled growth, proven reliability, and adaptability are how Jartek stays competitive.” In a world where species, costs, and expectations shift quickly, success belongs to mills and partners that tailor, not template.