Panels & Furniture Asia May/June 2020

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62 | WOOD CLINIC May / June 2020, Issue 3 | Panels & Furniture Asia Figure 3: Common problems in homemade dowels. - The moisture content of Nyatoh wood is 12 to 20 per cent, with the equilibrium moisture content in the warehouse being 10 to 14 per cent. When other wood with high moisture content in the warehouse continues to release moisture, wood shrinkage will lead to deformed doorpost; the gluing strength of the log nail will also be affected. Reasons why there is uneven wood moisture content: it can be due to the non-standardised operation of the drying kiln – the materials used for the doorpost and the transom are dried in the same drying kiln, and the material used for the doorpost is high in water content due to its greater thickness, which results in the deformation of the doorpost. Suggested solution: in addition to stacking materials with 1-inch square stickers for wood drying in the kiln, make sure the wood is of the same thickness, and avoid mixing with other tree species as much as possible. Before drying, it is necessary to confirm the hot air circulation in the drying kiln is uniform without short flow. 2. Weak gluing strength of the Nyatoh wood louvered door after assembly - Non-standard, uneven or insufficient glue is applied on the log mortises. It is common to apply glue only on one side of the mortise or only on its bottom, which will result in weak assembly gluing strength. It is recommended to use a small brush, or a pneumatic glue gun with a nozzle diameter of 8.0mm and a small hole in the periphery. It will help coat the glue evenly around the perimeter and ensure there is sufficient glue. - Mortise glue film crusts and dries up. After the doorpost mortise is glued and upon delay in gluing, the glue film in the mortise will crust and become semi-dry, leading to insufficient gluing strength after the door is assembled. It is recommended that assembly should be finished within 3 to 5 minutes after applying Europe D3 water-based white latex. Figure 4: Schematic diagram showing that the moisture content of dowels can go up to 14.5 per cent with the moisture meter - The quality of the dowel is inconsistent. Shortcomings of the dowel such as fuzzing, different diameters, different lengths, uneven chamfering at both ends (as shown in Figure 3), and high moisture content (as shown in Figure 4) can affect the gluing strength of the door after assembly. It is suggested to strictly control the specification of dowel and its screw thread quality. Diameter tolerance ≤0.1mm and water content control at 8%±2% are the best. - The quality of the log mortises is inconsistent. The difference in sizes and depths of the log mortises will also lead to insufficient gluing strength after assembly of the louvered door. It is suggested to strictly control the specification of the log mortise and ensure that the mortise diameter tolerance is ≤0.1mm, and the drill bit should be checked regularly to ensure its sharpnesss. The above brief description and suggestions are provided for reference, which I hope will be helpful to you when dealing with the shortcomings of the louvered door, and improving production efficiency. P
May / June 2020, Issue 3 | Panels & Furniture Asia WOOD CLINIC | 63 HANOIWOOD 2021 20-22 JANUARY 2021 Venue: International Centre of Exhibition (I.C.E ), Hanoi 91 Tran Hung Dao Street, Hoan Kiem District, Hanoi , Vietnam QR Code to exhibition location on Google Map JOINTLY ORGANISED BY BINH DUONG FURNITURE ASSOCIATION VIETNAM TIMBER AND FOREST PRODUCT ASSOCIATION PANELS & FURNITURE GROUP Pablo Shanghai Contact: Rain Ma Mobile: (86) 182 1755 3837 Email: 2229204646@qq.com PLEASE CONTACT: Pablo Publishing Pte Ltd 3 Ang Mo Kio Street 62 #01-23 Link@AMK Singapore 569139 Tel: (65) 6266 5512 Mobile: (65) 9621 4283 Email: williampang@pabloasia.com
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Panels & Furniture Asia May/June 2020

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