Wood rapid-drying method

Abstract

Present invention refers to timber quick drying method. It contains 1, putting to be processed timber in timber drying chamber, heating from 30 degree centigrade to 70-98 degree centigrade within 4 to10 hr and making timber drying vapour being saturated state, 2, keeping temperature for a period, holding time scaling up according to timber thickness, holding time hrs being equal to timber thickness cms, 3, fast reducing timber drying chamber temperature in a period according to timber thickness, 4, repeating step 1-3 by several time, wherein each time the timber heating time being 10-50 minutes, and removing filling saturated vapour process to reduce timber moisture content to demand value. Said invention has equal moisture content gradient and temperature gradient and saves energy source

Description

technical field [0001] The invention relates to a wood treatment method, in particular to a wood rapid drying method. Background technique [0002] Wood needs to be pre-treated before use, and drying is an important part of it. On the premise of ensuring the quality of wood drying, accelerating the drying speed and shortening the drying time to achieve the purpose of energy saving and high efficiency has been the goal that people have been pursuing for a long time. [0003] At present, traditional steam drying chambers are used to dry wood at home and abroad, mainly using the principle of moisture conduction, that is, the principle of moisture content gradient. Specifically, the moisture in wood tends to flow from the part with high moisture content to the part with low moisture content. However, the heat and moisture conduction characteristics of water in wood, that is, the principle of temperature gradient has not been utilized. The so-called temperature gradient princip...

AI Technical Summary

Problems solved by technology

[0014] Because the moisture content gradient and the temperature gradient of the traditional drying process of wood are reversed, and the internal stress of the wood is large, it is difficult to significantly shorten the drying time, and it is easy to deform the wood and lose its use value. For example, dry 23mm thick oak wood with the traditional process For floor materials, it takes 13-14 days to dry from raw material to moisture content of 8-12%; to dry 60mm thick slabs of Pinus sylvestris, it takes 15-16 days to dry from raw material to moisture content of 8-12%; For birch slabs with a thickness of 50mm, it takes 23-24 days for the raw wood to dry to a moisture content of 8-12%. Such a long drying time will increase energy consumption. At present, most wood products companies use electricity for wood drying. This kind of slow drying speed and large power consumption are difficult to overcome by traditional drying process.