Problems and solutions of end cracks, surface cracks and internal cracks in home office furniture


The biggest factor affecting the processing of solid wood high-end home office furniture is the moisture it contains. The editor of the home office furniture manufacturer tells you that the treatment after drying also has a great impact on the later processing of home office furniture. The drying process of the boards should be adjusted in time, otherwise there will be problems of cracking of home office furniture; after drying, it needs to be fixed to make the boards of home office furniture reach the best production state.

There are three common quality defects in home office furniture drying: end cracks, surface cracks, and internal cracks. The editor of home office furniture will tell you the reasons for the two defects and how to prevent them. Wood end cracking for home office furniture: During the drying process, the two ends of the wood are the outermost ends of the cut surface of the board, so the water evaporates and dries first. When the moisture content at both ends is too low, lower than the saturation point of the fiber structure of the board , the wood cells at both ends will shrink, and when the force of contraction is greater than the limit of the gravitational strength between wood fibers, end cracking will occur. The performance of end cracks in fashion home office furniture is: longitudinal cracks occur at the pith center or rough wood rays or along the outer panel surface, which has a lot to do with the internal temperature control of the panel.

Preventive measures for end cracks: when stacking home office furniture boards before drying, paint high-temperature-resistant paraffin on the ends of the boards; windshield. The principle of the measures: try to reduce the evaporation rate of the water at both ends of the wood of home office furniture, so as to supplement the water evaporation at both ends when the water inside the board diffuses radially. Wood surface cracking of home office furniture: The surface of the board is cracked during the drying process.

This kind of problem is also due to the moisture problem inside the board, which affects the expansion and contraction force of different layers and causes cracking. In the initial stage of drying home office furniture panels, the moisture on the surface of the panels evaporates too quickly, and a strong pulling force will be formed after the moisture evaporates too quickly, the surface cells will shrink due to syneresis, and the internal moisture will not be able to diffuse in time, resulting in the inability of the internal and external panels to shrink synchronously , resulting in a pressure difference. The outer surface material shrinks, but the inner material does not shrink. When the tensile stress on the surface exceeds the tensile strength of the transverse grain, cracks will form on the surface of the home office furniture board.

If the crack is not too serious, it can be completely closed in the middle and late stages of drying, and it is even difficult to detect with the naked eye. Slight surface cracks have little effect on quality. However, when it is processed into finished home office furniture and painted, the cracks will penetrate into the paint and leave traces, which will affect the appearance.

The way to prevent surface cracking is that the early benchmark should not be too hard, and pay attention to controlling the development of drying stress. The intermediate humidity treatment should be carried out when the initial moisture content is reduced by about 1/3, because the surface tension stress may reach the maximum at this time. For home office furniture thick boards or hard broad-leaved materials, the intermediate treatment should be carried out several times, and can be treated every 10% of the moisture content or every 2 to 3 days to eliminate the tensile stress on the surface.

Pay attention to observe the wood in the kiln more, adjust the drying process in due course, and properly slow down the drying speed. Internal cracks in home office furniture wood: After drying, the section of home office furniture boards along the wood ray is in a honeycomb shape, and internal cracks can only be seen after cutting the boards. However, if some areas are raised and bulged on the dried wood, there may be internal cracks in this place.

The problem of internal cracking is that the moisture content in the wood of home office furniture is low in the later period. Due to the continuous drying, too much moisture inside expands and evaporates. When the internal moisture expands too much or too fast, it will cause the internal substrate to shrink. . However, the moisture content of exterior home office furniture wood is low, and high-temperature plasticization (high speed) forms a stress layer, which cannot shrink synchronously to form internal cracks. Preventive measures for internal cracking: In the later stage of drying, be careful not to dry too fast, and observe the test boards in stages.

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