According to the source, veneer can be divided into natural veneer veneer, artificial veneer, integrated veneer, dyed veneer and rolled veneer.
　　The veneer commonly used in furniture and wood door factories is natural veneer with a thickness of 0.5-1mm cut from oak, ash, cherry, black walnut, etc. Because of the limitation of wood square width and in order to meet the requirements of wood grain patchwork, the natural veneer usually needs width splicing. The splicing methods include manual tape splicing, manual hot melt glue line splicing, mechanical hot melt glue line splicing, mechanical seamless splicing, etc. From the perspective of adhesion, the basic requirements for veneer are as follows:
　　（1）The water content is uniform, reaching 8% - 12%.
　　（2）It shall be flat without curling, and the joint shall be tight no more than 0.02mm.
　　（3）It shall be clean and free of oil stain, wood dust and other pollution.
　　As veneer is easy to shrink and expand, it is recommended that the temperature in the warehouse and parquet workshop should be kept at 20-25 ℃, the relative humidity should be 45% - 55%, and the equilibrium moisture content should be 8% to maintain its dimensional stability.