the following is an introduction to the control of moisture in the drying process of wood drying equipment:
in our country's export furniture, the real furniture accounts for a large proportion. customers in foreign orders require a high moisture content of this product. usually, the moisture content of polished solid wood products is not more than 8%, and the moisture content of non-polished solid wood furniture products required by wood drying equipment is not more than 10%, which is higher than the national standard. the requirement of not exceeding the local equilibrium water content (about 15%) obviously increases the difficulty. judging from the quality requirements of wood products, if the moisture content exceeds 10%, once the product reaches the high temperature and low humidity environment, there will be warping, deformation and cracking of the board surface, which will affect the quality of the product and lead to rejection and claims by customers. it is not difficult to make the wood meet the above requirements in the drying kiln, but the corresponding measures should be taken to ensure the wood in the low moisture content range in the furniture production process. equilibrium water content depends on the temperature and humidity. even in the same area, temperature and humidity change greatly in a day and night, so the equilibrium water content also varies greatly. the measured results in a certain place in jiangsu province in june show that the minimum and maximum balanced water content in a day and night in this area is 7.l% and 24.2%, with a difference of 17.1% and an average of 16.5%. the time zone with the balanced water content less than 10% is 11:30-16:30 for a total of 5 hours, and the time with the balanced water content between 10% and 14%. it lasts 3.5 hours; the equilibrium moisture content is between 14% and 24.2% for 15.5 hours; and 19 hours a day are facing dehumidification problems. wood drying equipment in a day and night, noon to afternoon (11:30-16:30) as the ideal water content environment time; high night equilibrium moisture content, wood products are easy to absorb moisture, water content control is particularly important. in the process of production, the final moisture content of products varies greatly with or without water content control. generally, there are obvious differences after 3 days and nights. the moisture absorption of annular porous wood and soft wood is especially obvious. for example, the final moisture content of fraxinus mandshurica and rubber wood with water content of 6% in feeding increases to 15.2% and 15% respectively after 7 days and nights.
the above is about the control of moisture in the drying process of wood drying equipment. i hope you have some information. please log in at www.baoyangganzao.com for more information.
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