Sandpaper grit chart wood3/21/2024 įinally, consideration needs to be given to whether the finished wood will come into contact with food, in which case a food-safe finish should be used, local environmental regulations governing the use of finishes, and recycling of finished wood at the end of its life. Both problems can be avoided by storing wood indoors in an environment where it can equilibriate to a recommended moisture content (6 to 8%) that is similar to that of the intended end use of the furniture. Changes in wood moisture content can result in swelling and shrinkage of wood which can stress and crack coatings. Wood’s moisture content affects the staining of wood. Any excess glue should be carefully removed to avoid further damage to the wood. Care should be taken to avoid squeeze-out of glue from joints because the glue will reduce absorption of stain and finish. HB is recommend for face work and 2H for joint work. Wood should be marked for cutting using pencil rather than ink however, avoid hard or soft pencil. Careful handling of the wood is needed to avoid dents, scratches and soiling with dirt. Planning for wood finishing also involves being aware of how the finishing process influences the end result. Some tropical woods, such as rosewood ( Dalbergia nigra), cocobolo ( Dalbergia retusa) and African padauk ( Pterocarpus soyauxii), contain extractives such as quinones, which retard the curing of unsaturated polyester and UV-cured acrylate coatings, and so other finishing systems should be used with these species. The pores in ring-porous woods more readily absorb pigmented stain, and advantage can be taken of this to highlight the wood's grain. Woods that are coarse textured such as oaks and other ring-porous hardwoods may need to be filled before they are finished to ensure the coating can bridge the pores and resist cracking. Alternatively, the wood can be bleached to remove the natural colour of the wood and then stained to the desired colour. For example, woods that show great variation in colour between sapwood and heartwood or within heartwood may require a preliminary staining step to reduce colour variation. Planning for wood finishing also involves thinking about the properties of the wood being finished, as these can greatly affect the appearance and performance of finishes, and also the type of finishing system that will give the wood the desired characteristics. Care should also be taken to eliminate recesses in furniture, which are difficult to finish with some systems, especially UV-cured finishes. Careful attention should also be given to the design and strength of wooden joints to ensure they do not open-up in service and crack the overlying finish. Care should be taken to ensure that edges of furniture are rounded so they can be adequately coated and are able to resist wear and cracking. Planning for finishing begins with the design of furniture. In addition, finishing provides a way of giving low-value woods the appearance of ones that are expensive and difficult to obtain.įinishing of wood requires careful planning to ensure that the finished piece looks attractive, performs well in service and meets safety and environmental requirements. Finishing can also influence other wood properties, for example tonal qualities of musical instruments and hardness of flooring. Finishing can also make wood easier to clean and keep it sanitized, sealing pores that can be breeding grounds for bacteria. įinishing is the final step of the manufacturing process that gives wood surfaces desirable characteristics, including enhanced appearance and increased resistance to moisture and other environmental agents. Wood finishing refers to the process of refining or protecting a wooden surface, especially in the production of furniture where typically it represents between 5 and 30% of manufacturing costs. ( March 2021)Ī worker sprays a urethane finish onto a timber Please help rewrite the content so that it is more encyclopedic or move it to Wikiversity, Wikibooks, or Wikivoyage. This article contains instructions, advice, or how-to content.
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