Solid wood flooring usually uses hard broad-leaved trees, and medium and high-grade solid wood flooring mainly uses high-quality imported materials. A more reasonable production method is to first process the logs into semi-finished products of floor slabs at the place of origin, and perform wax seals on the ends of the boards to prevent end cracks, and then sell them to the floor processing factory for artificial drying, and then process them into finished floors. Artificial drying is an important part of ensuring the quality of solid wood flooring. The purpose of drying is mainly to stabilize the wooden floor shape, so that it will not shrink, swell and deform during the subsequent use, and also improve the processing performance, performance and durability of the solid wood floor. The key to the quality of the drying is that the final moisture content must reach an equilibrium moisture content slightly below the environment of use. It is about 10%-12% in the south of China, 8%-10% in the north, and 6%-8% in the northwest, and it must be dry and ensure that the non-warping, cracking and drying stress are basically relieved. Dry quality and drying cost are generally mutually restricted, but with reasonable drying equipment, reasonable drying process and proper operation, the drying cost can be ensured while minimizing investment and drying costs. . Due to the variety of wood drying methods and drying equipment, the products sold in the market are mixed. To help the wood flooring enterprises to purchase the drying equipment reasonably, this article is written for the reader's reference. Commonly used wood drying methods include: steam heating, conventional drying, furnace gas heating, conventional drying, hot air drying, dehumidification drying, vacuum drying, and conventional drying of hot water and high temperature water circulation heating in recent years. The appropriate drying method must be selected according to the drying characteristics and requirements of the solid wood floor, as well as the size and conditions of the enterprise. The method is a conventional drying method for drying wood by using a saturated water vapor having a gauge pressure of P ≤ 0.4 MPa and heating the drying air in the kiln by a heater. The advantage is that the process parameters are easy to control, the drying quality is generally good; the temperature and humidity can be adjusted in a wide range, and various materials can be dried; and the heat can be concentrated and the application is relatively common. The disadvantage is that steam boilers are needed, and the investment cost is high; and the latent heat of vaporization of steam is mainly utilized, and the condensed water is often unutilized, resulting in waste and increased cost due to the trouble of recycling. It is mainly suitable for the production of large-scale or ready-made steam for use, especially for dry softwood and soft hardwood or thin plate. For medium and small wooden flooring companies, this method is not suitable for expensive steam boilers. Further reading: Wood moisture content should be understood when making furniture This is a conventional drying method for wood that is heated directly or indirectly with burning wood. The direct heating of the furnace gas will blacken the wood and cause fire, so there are many ways to dry the furnace gas without indirect heating: 1 Simple fire type: The stove and the furnace gas pipeline are arranged in the underground of the fire room, and the material pile is placed in the fire room, and it is naturally circulated and dried by the hot and humid air flow. This is a relatively primitive method of drying the soil, often causing the wood to bake or fire. It is not recommended. 2 small stove oven type: This is a small dryer with a wood waste burning furnace and its furnace gas pipe and simple fan on the side of a metal case similar to a container, which can hold wood 2-5m3. The drying method also has safety hazards, which are easy to roast wood or fire, and the air circulation is unreasonable and the drying is uneven. It is not recommended. 3 Modern furnace gas indirect heating and drying kiln: The kiln has a furnace tube heating tube set with reasonable design and arrangement. The other configuration is the same as that of the general drying kiln. In the case of such a kiln designed by experts, safety and reliability are guaranteed. The special burners of this type of kiln can be located outside the kiln or in the kiln. The former is relatively safer, but the cost and heat loss are relatively high. Furnace gas heating conventional drying does not require a steam boiler, and uses wood waste energy, low investment costs, and low drying costs. However, it is difficult to adjust the temperature and humidity, and the quality of drying is not easy to guarantee. If the design of the drying kiln is not good, it is also easy to bake wood and fire. For medium and high-grade solid wood flooring, this drying method should be used with caution. The hot blast stove for heating is located outside the kiln, and is connected to the drying kiln by inlet and return pipes. The air drying medium is heated by the return air duct to the hot blast furnace outside the kiln, and then sent back to the kiln by the air blower, which is a conventional drying of the air flow double cycle. The shortcomings of this method are low heat utilization rate; large power consumption; uneven distribution of temperature and humidity fields in the kiln, difficult adjustment of process parameters, slow and uneven drying speed; easy return to the return air duct and blower; small capacity of the drying kiln The output is higher than the cost, and it is not recommended. A method of drying wood by gradually dehumidifying and drying the air drying medium in the kiln with a dehumidifier (or heat pump). The dehumidifier can only work in the set temperature range to have the dehumidification effect. The working temperature of the ordinary dehumidifying dryer does not exceed 55 ° C, and the working temperature of the medium temperature dehumidifying dryer does not exceed 65 ° C. The advantage of this method is that the use of electrical energy is not polluted; it is easy to operate, and the drying quality is generally good. The disadvantage is that the use of electric energy drying has high cost; the drying time is long and the productivity is low; the dehumidifier is prone to failure, the maintenance cost is high, and the service life is short; there is no humidity control device, and the drying stress cannot be eliminated. Since the drying power mainly relies on lowering the relative humidity of the drying medium instead of increasing the temperature, the effect is more obvious in the stage of high water content or when the drying is easy to plant, but the effect is not obvious in the stage of low moisture content or dry and difficult dry species. However, drying dry tree species by this method or when the water content is high, it is too slow to dry, sometimes causing wood mold. Wood flooring companies are advised not to use unless the production is low and there are special requirements for environmental protection.
The height of the elevating study table can be adjusted by itself. For example, when a child is doing homework, he can adjust it to the most comfortable and suitable height according to the height of the child, so that when the child is doing homework, he can avoid hunched over the chest or tilted his head too much. The sitting posture of the child and the use of a desk with a suitable height will have many benefits for the child's sitting posture and physical development after a long time.
Children'S Desk Chair,Drawing Children Study Desks,Ergonomic Home Study Desk,Home Study Desk Igrow Technology Co.,LTD , https://www.szigrowdesks.com
1.1 steam heating conventional drying
1.2 furnace gas heating conventional drying
1.3 hot air drying
1.4 Dehumidifying and drying
Enterprises specializing in the production of intelligent office supplies, using intelligent production, with multi-functionality, electric control of the lifting table control, more intelligent, more accurate, optimize the imperfection of ordinary table defects, it brings high-quality products to users. The sense of experience is a kind of spiritual enjoyment, and it is also a perfect improvement for the technology industry.
