| Wood laminated plywood is a process in which small pieces of wood are joined together by adhesive to form a large piece of wood. Most woods are fairly easily bonded in their natural state. When the wood is treated with a preservative, a surface layer is always formed which may not be fully compatible with the applied adhesive, resulting in failure of all or part of the bond line. Preservative treatment may alter the surface of the wood, prevent the adhesive from entering the wood, or interact with chemicals and affect the properties of the adhesive, resulting in incomplete solidification leading to early splitting of the glue layer. Therefore, in any bonding operation, the factors to consider are: 1. The wood should be dried to the appropriate moisture content (as a guide, plate: 10-12%, flakes: 6%). However, the adhesive manufacturer should be consulted about the suitability of the moisture content for a particular situation; 2. The glued surface must be clean and more suitable is the surface that has just been machined. Any accumulated dust and oxidation of the bonding surface may affect the quality of the joint; 3. The adhesive must be properly mixed (as recommended by the manufacturer) and applied evenly; 4. The pressure at the joint must be sufficient to ensure that there is considerable close contact; 5. The pressure must be maintained until there is sufficient strength at the bond to prevent the blocks from separating during operation; 6. Adequate adjustment conditions must be allowed to allow the adhesive to produce high strength prior to application; keep the shop or bonding environment as clean as possible. For preservative treated wood, in addition to the factors mentioned above, the preparation of the wood surface must be considered. Wood treated with water-soluble preservatives such as copper-chromium-arsenic (CCA) must be dried to a moisture content depending on the site of application (as a guide, the moisture content of the board must be approximately 15 to 20%, and the sheet must be more suitable at 10%) under). The range of these moisture contents appears to be slightly higher than the range recommended for the untreated wood mentioned above. Wood treated with water-soluble preservatives usually has chemicals deposited on the surface during drying, resulting in adhesion of the wood. It is particularly annoying and may result in incomplete gluing. Planing off deposits on the joint surface may improve the nature of the joint. In addition, bonding immediately after planing will result in better connection results. Wood treated with an organic solution preservative such as Light Organic Solution Preservative (LOSP), if stored in a ventilated environment, will normally evaporate quickly. The bonding operation must begin after the surface of the wood has completely dried. In order to ensure a perfect connection, it is recommended to slightly plan or sand the joint surface before applying the adhesive. In any case, prior to commercial use, it is best to establish the integrity of the treated or untreated wood block in accordance with appropriate standards. | |
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