What environmental factors should be considered for block board maintenance

Humidity fluctuation is a key factor affecting the performance of Block Board. Studies have shown that when the relative humidity of the environment exceeds 70%, the hygroscopic expansion coefficient of the cork core can reach 0.3%-0.5%, which will cause the board to warp and deform by 0.5-2mm. Due to the failure to effectively control humidity, a certain seaside villa project caused large-scale cracking of the wall panels during the rainy season, and eventually had to be replaced as a whole. Laboratory data showed that the dimensional stability of the boards stored in a constant temperature and humidity environment (20℃±2℃, 50%RH±5%) was improved by more than 40% compared with the conventional environment. Therefore, it is crucial to establish a three-level humidity monitoring system during the maintenance process: real-time monitoring of the storage environment through a temperature and humidity recorder, dynamic adjustment using a dehumidifier, and regular use of a moisture content detector to sample the moisture content of the board core to ensure that it is controlled in the ideal range of 8%-12%.

The impact of temperature changes on the performance of the bonding layer is also significant. When the ambient temperature is below 5℃, the curing speed of the adhesive decreases by 60%, resulting in a reduction of more than 30% in bonding strength. A northern project did not take preheating measures during winter construction, resulting in 15% of the cabinet panels being debonded. In addition, high temperature environments also pose risks. When the temperature continues to exceed 35°C, the lignin in the core material may be thermally degraded, accelerating the aging of the material. Therefore, the maintenance plan should include a temperature compensation mechanism: in summer, the surface temperature of the panel should be reduced by a sunshade net, and the panel should be subjected to a 48-hour constant temperature treatment before winter construction, and weather-resistant adhesives should be used to improve its environmental adaptability.

Light radiation is the main factor causing the fading of the surface veneer. When the ultraviolet wavelength is in the range of 280-400nm, the photooxidation of lignin is most obvious, which can cause obvious color difference in the panel within just 6 months. A commercial space project did not take effective protective measures, resulting in the fading of the wood veneer by 3 color levels within 1 year. In maintenance, a composite protection strategy should be adopted: a varnish with added ultraviolet absorbers should be used to form a physical barrier, blackout curtains should be used to control the light intensity, and a colorimeter should be used regularly for color monitoring. When the color difference value ΔE exceeds 2, timely touch-up is required to maintain the beauty and performance of the wood finish.

Pollutants in air quality can also cause chemical corrosion. When the sulfur dioxide concentration exceeds 0.05ppm, it will react with the tannic acid in the board, causing black spots on the surface. A chemical plant project did not have an air purification system, resulting in 30% of office furniture being corroded. Therefore, the maintenance plan should include air quality control measures: install a fresh air system to filter PM2.5 and harmful gases, and regularly use a gas detector to monitor pollutant concentrations. For contaminated boards, professional cleaning is required to ensure their long-term performance and appearance.