Temperature is gradually increased while humidity is lowered. This creates a pressure gradient that moves moisture from the center of the plank to the surface.
Specialized schemes used for thick beams or expensive hardwoods where standard drying might cause severe cracking. sushka pilomaterialov shema
The timber is heated in a high-humidity environment to warm the core of the wood without evaporating surface moisture too quickly, which prevents surface hardening. Temperature is gradually increased while humidity is lowered