Introduction to wood dyeing technology

Wood dyeing is a chemical or physical chemical combination of dyes and wood, which makes the wood have a certain color and strong processing. It is an important means to improve the surface quality of wood, improve the visual characteristics of wood and increase the added value of wood. Wood dyeing is dyed, chemically colored and pigmented. Wood dyeing is an important part of the wood processing and utilization process. Wood dyeing is divided into water-soluble dyeing, alcohol-soluble dyeing and oil-soluble dyeing according to the solvent, and is divided into deep dyeing method and surface dyeing method according to the dyeing method. Deep dyeing mainly uses vulcanization to process veneers and wood, such as veneer thin wood dyeing and technical wood veneer dyeing. Surface dyeing is the treatment of the surface of wood products by spraying, brushing or showering.

There are many ways to dye wood, depending on the use of the dyed material. The wood industry usually uses several methods such as thin wood dyeing, veneer dyeing and solid wood dyeing. Thin wood dyeing refers to sliced ​​thin wood with a thickness of 0.1 to 0.3 mm. Veneer dyeing is a method of uniformly dyeing a rotary cut veneer by dipping treatment, and the thickness of the veneer is 0.5 to 3 mm. The veneer dyeing process varies greatly depending on the tree species and dyes. The dyed veneer is mainly used as a composite board for technical wood. Solid wood dyeing is the dyeing treatment of the other wood or logs. The dyeing materials are mainly used for cutting thin wood or making high-grade furniture or decorative materials. Due to the large thickness and long wood length, it is difficult to uniformly and uniformly dye the wood under the conventional conditions by the self-permeability of the dyeing liquid, and it must be completed under complicated conditions such as high temperature, vacuum and high pressure.

Wood dyeing effect is measured by the above dyeing rate, level dyeing and light fastness. In addition to the influence of dyes, auxiliaries, dye pH and dyeing process, it is also affected by tree species, wood structure and The influence of chemical composition. Due to the diversity and complexity of wood structure, and the wood dyeing industry is a new industry, there are many problems in the dyeing of different tree species, the dyeing of different dyes on wood, and the suitable dyes required for different products. further research.

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