PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR (applying liquids or other fluent materials to surfaces in general B05; coating wood or similar material B44D); CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS

Description

B27K covers processes, apparatus, and chemical or physical treatment substances for impregnating, staining, dyeing, or bleaching wood and related fibrous materials (cork, cane, reed, straw). This includes methods and equipment for applying permeant liquids to wood that are not covered by more specific subclasses, such as preservative treatments, colorization processes, and surface modifications using chemical or physical means. The classification encompasses both the treatment procedures and the selection or formulation of substances used in these operations, excluding treatments already classified under dedicated preservation or specialized wood-working processes.