Manufacturing process and principle of engineered and technological veneer
Introduction: engineered and technological veneer: refers to the recycled veneer, which is the “upgraded version” of natural wood. The raw materials used are logs, which are produced into engineered and technological bark after a series of design, dyeing, reconstruction, disinfestation treatment, high temperature and high pressure.
There are ten processes from the manufacturing and selection of technical wood veneer to the planing and cutting,
1. Material selection: the base material conditions of the engineered and technological veneer should be straight and flat in texture, uniform in material quality, easy to cut and bleach, and good in bonding performance; The commonly used wood species are: wutong, poplar, paulownia, pine, willow eucalyptus and other fast-growing trees. 2. Softening: Soak logs before peeling for softening treatment to reduce cutting resistance and improve the quality of peeled wood. 3. Spinning veneer: Spinning the softened wood into veneer. 4. Bleaching: Because of the color components such as lignin and minerals contained in the engineered and technological veneer, bleaching is generally required. The degree of bleaching varies according to the color of the simulated tree species. 5. Dyeing: wash the bleached veneer, and then dye the veneer according to the color of the imitated precious tree species. 6. Drying: After dyeing, clean the veneer and dry it to the moisture content of 8~12%. 7. Cloth glue combination: according to the color and texture of the imitated tree species, glue the wood skins of different colors and stack them. The selection of adhesives shall be those with certain water resistance and certain flexibility after curing to facilitate planing and cutting. 8. Compression gluing: the gluing process is to fully glue all the veneer under a certain pressure and discharge the excess water. The temperature and time depend on the compression gluing method, glue type and board thickness. 9. Wooden batten forming: the wood batten formed after compression and gluing shall be sawn to the size to be planed, and the two ends of the wood batten shall be sealed with PVC film to avoid end crack and breakage of the sliced veneer. 10. Planing: The planing thickness of engineered and technological wood is generally 0, 2 mm~2, and 0 mm. It can also produce more complex textures through repeated combination of battens and repeated planing to obtain rich and colorful wood color and wood texture.
