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Anti - corrosion treatment technology of laminated plywood

- Sep 05, 2017 -

Wood laminated plywood is a process that connects the small pieces of wood together and becomes a large piece of wood. Most of the wood can be easily bonded in their natural state. When the wood is treated with a preservative, there is always a layer of surface that may not be completely compatible with the applied adhesive, resulting in failure of the entire or part of the bond line. Preservative treatment may alter the surface of the wood, prevent the adhesive from entering the wood, or act with the chemical, and affect the properties of the adhesive, resulting in incomplete solidification leading to early splitting of the adhesive layer. Therefore, in any bonding operation, the factors to be considered are:

1, the wood should be dried to the appropriate moisture content (as a guide, sheet: 10-12%, sheet: 6%). However, the adhesive manufacturer should be consulted with a suitable range for the moisture content in a particular case;

2, the glued surface must be clean and, more suitably, the surface that has just been machined. Any accumulation of dust and adhesion of the surface oxidation may affect the quality of the connection;

3, the adhesive must be properly mixed (according to the manufacturer recommended), at the same time to evenly applied;

4, the pressure at the junction must be sufficient to ensure that there is considerable contact;

5, the pressure must be maintained until the bond has enough strength to prevent the wood block in the operation of the separation;

6, must allow sufficient adjustment conditions, so that the adhesive in the product before the application of high strength; keep the workshop or bonding environment as clean as possible.

For the treatment of wood preservatives, in addition to the above mentioned factors, the preparation of wood surface must be considered. Wood treated with water-soluble preservatives such as copper chrome arsenic (CCA) must be dried to the moisture content of the site of application (as a guide, the moisture content of the sheet must be about 15 to 20% and the sheet must be more suitable at 10% under). The range of these moisture levels appears to be slightly higher than the range recommended by the above-mentioned non-treated wood. The wood treated with the water-soluble preservative usually has a chemical buildup on its surface, resulting in the adhesion of the wood Especially annoying, and may lead to incomplete gluing. Finding deposits on the connection surface may improve the nature of the connection. In addition, sticking immediately after planing will result in better connection results. Wood treated with organic solution preservatives such as light organic preservatives (LOSP), if stored in a ventilated environment, the solution used will evaporate normally. The bonding operation must begin after the wood surface is completely dry. In order to ensure a perfect connection, a slight planing or sanding of the connecting surface before the application of the adhesive is worth recommending. In any case, it is advisable to establish the connection integrity of the treated or untreated wood piece prior to commercial use, preferably in accordance with appropriate standards.

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