Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
  • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B3/00—Drying solid materials or objects by processes involving the application of heat
  • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
  • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
  • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
  • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
  • F26B2210/16—Wood, e.g. lumber, timber

Definitions

• the invention relates to a microwave vacuum drying process for wood for solid wood floor heating, relating to the field of wood floor and furniture manufacturing.
• Solid wood floor enters the floor heating environment has become an urgent demand of consumers.
• the solid wood floor heating floor has The natural advantages of comfortable feet, warm winter and cool summer, silent and non-slip, and adjustable temperature and humidity can significantly improve the comfort of the living environment.
• consumers pay more attention to the environmental health of the home and begin to realize the natural environmental protection and green health.
• Solid wood flooring is the first choice for floor heating.
• the solid wood floor heating maintains the natural properties of the wood.
• the pattern is natural and beautiful, and the texture is unique. This is the quality that is not available in paving materials such as wood-based panels and ceramic tiles.
• Microwave vacuum drying technology originated in the 1930s and became a hot spot in the world due to the discovery of its thermal effects. Later in the 1960s and 1970s, many countries began to apply this technology to wood drying, but due to microwave drying technology. Immature, although it can significantly improve the drying rate of wood, but it is easy to damage the wood, can not effectively guarantee the quality of the wood after drying, it is difficult to achieve large-scale industrialization.
• the technical problem to be solved by the present invention is to provide a microwave vacuum drying process for wood for solid wood floor heating.
• the invention not only greatly improves the drying rate of the wood, but also the invention can significantly improve the permeability of the wood, and provides favorable conditions for the subsequent production of the solid wood floor heating type such as flame retardant, silent, anticorrosive and dimensional stability improvement. At the same time, it effectively improves the drying quality of the wood and improves the drying yield.
• a microwave vacuum drying process for wood for warm floor heating specifically comprising the following steps:
• Constant-speed drying stage when the wood moisture content is between 45% and 25%, the wood is The second microwave irradiation treatment, the radiation power is 0.8-1.2KW, the vacuum degree is maintained at -0.055-(-0.065)Mpa, the irradiation time is 18-25min, and the drying rate is maintained at 0.90-1%/min;
• cooling and cooling stage cooling the wood to complete the microwave processing of the floor.
• the above-mentioned wood microwave drying process for wood floor heating floor specifically includes the following steps:
• Constant-speed drying stage When the wood moisture content is between 45% and 25%, the wood is subjected to a second microwave irradiation treatment, the radiation power is 1KW, the vacuum degree is maintained at -0.060Mpa, the irradiation time is 20min, and the drying is performed. The rate is maintained at 0.986%/min;
• Deceleration and drying stage When the wood moisture content is less than 25%, the wood is subjected to the third microwave irradiation treatment, the radiation power is 0.6KW, the vacuum degree is maintained at -0.052Mpa, the irradiation time is 15min, and the drying rate is maintained at 0.579%. /min;
• cooling and cooling stage cooling the wood to complete the microwave processing of the floor.
• the interval of the three microwave irradiation treatments is 2 min.
• step d cold But to 35 ° C.
• the invention has the beneficial effects that compared with the prior art, the wood microwave drying treatment process of the invention can significantly improve the permeability of the wood, enhance the effect of the drying and humidity control treatment in the later stage, and also increase the drug loading amount. It has a positive effect on the anti-corrosion, flame-retardant and silent treatment of the heating floor in the subsequent order.
• the wood microwave modification treatment through the wood microwave modification treatment, the drying rate of the wood can be greatly accelerated, and the drying quality can be improved. Due to the use of microwave modification treatment, it will not Producing additional energy consumption and environmental pollution, in line with China's green environmental protection development philosophy, laying the foundation for the development of inferior materials in the entire timber industry.
• the wood treated by the present invention has the following characteristics through the applicant's test:
• the direction of heat transfer is opposite to the direction of water evaporation. Therefore, the heating rate is slow and the efficiency is low.
• the speed of microwave vacuum drying is independent of the thermal conductivity of wood. And depending on the intensity of the microwave field, that is, depending on the magnitude of the microwave power.
• the depth of microwave heating is related to the microwave frequency, and the electromagnetic frequency of the same frequency In terms of wave, the heating depth is related to the moisture content and material of the wood. The water content is large and the dielectric loss characteristics of the wood itself are large, and the heating depth is small. On the contrary, the heating depth is large. At present, the old floor of the wooden floor is the center of wood processing. Among them, wood drying is the main industry. The time required to treat southern pine with ordinary drying kiln is about 10-12 days.
• the drying time is too long, the drying cost is high, and the use is far.
• Infrared and steam energy for wood drying the energy utilization rate is less than 50%, and the utilization rate of microwave as energy can reach more than 75%, and the energy consumption by far infrared and steam drying is reduced by more than 25%.
• the time required for the treatment of southern pine in this process is only about 1.2h, which greatly shortens the drying cycle and reduces the drying cost;
• Embodiment 1 a microwave vacuum drying process for wood floor heating wood, specifically comprising the following steps:
• Material selection Southern Pine, size 1000mm ⁇ 135mm ⁇ 26mm, initial moisture content 50-55%.
• accelerated drying stage moisture content (water content inspection board) more than 45%, microwave power 1.6KW, vacuum -0.069MPa, radiation time 4min, drying rate is about 1.365% / min;
• Cooling and cooling stage Turn on the cooling system to cool down, wait until the temperature drops to 25 °C, and complete the microwave treatment process of the floor.
• Embodiment 2 Wood microwave drying process for wood floor heating, specifically comprising the following steps:
• Material selection Southern Pine, size 1000mm ⁇ 135mm ⁇ 26mm, initial moisture content 50-55%.
• accelerated drying stage moisture content (water content inspection board) more than 45%, microwave power 1.45KW, vacuum -0.068MPa, radiation time 5min, drying rate is about 1.398% / min;
• Cooling and cooling stage Turn on the cooling system to cool down, wait until the temperature drops to 35 °C, and complete the microwave treatment process of the floor.

Landscapes

• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Mechanical Engineering (AREA)
• Microbiology (AREA)
• General Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Molecular Biology (AREA)
• Electromagnetism (AREA)
• Biomedical Technology (AREA)
• Biotechnology (AREA)
• Physics & Mathematics (AREA)
• Drying Of Solid Materials (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=64396138

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Citations (5)

Family Cites Families (5)

• 2017
  • 2017-05-26 CN CN201710386189.6A patent/CN108931108A/zh active Pending
  • 2017-07-07 WO PCT/CN2017/092170 patent/WO2018214248A1/zh active Application Filing
  • 2017-07-07 DE DE112017007285.9T patent/DE112017007285B4/de active Active

Patent Citations (5)

Also Published As

Similar Documents

Legal Events