Microwave drying in wood application
In the furniture manufacturing , one of the most difficult problems is the dry timber , for which we go through repeated visits compared to determine the use of microwave drying , talking about this thing is still some experience.
A few years ago , microwave equipment manufacturers who have introduced me to microwave drying of wood , when I heard a dozen hours in the drying timber , endless laughing, it's not kidding !
I did not pay much attention to the matter , after a lapse of two months, I have nearly 200 diameter 8cm, length 90cm of maple wood, has a cylindrical shape with a lathe , but the water is too high ( about 30% ) can not be used , if general drying , cracking and deformation is inevitable, but also need more than 10 days of the time, try holding the idea , I said, "This afternoon pull over dry, tomorrow morning I'll be dry good timber " the next morning, when I went to the wood pile has been elevated , I have not said how dry ? Because the surface is almost no change, until I used the moisture meter measuring moisture content is already qualified . I really feel the magic , after I used to try all kinds of wood , the effect is very satisfactory.
In 1997 I bought a microwave drying equipment, along with the development of enterprises , three years later I bought a second microwave drying equipment, the past few years , every day we have to use the microwave equipment 20 hours , my experience are:
1 , flexible, one day can be dried two batches ( wood moisture content < 20% ) , can also be on the urgent requirements.
2 , it can save the direct drying semi- timber, the timber according to the purpose we next semi-finished into various shapes , into the microwave drying , which is more than the first material can be dried under increased utilization of 15-20% of the wood , the original crack is does not extend , in addition to about 30% of the scrap material is no longer dry.
3 , drying, setting high quality, dry conditions and little crack and deformation , furniture made of high quality, will not happen again cracking, deformation , therefore , united furniture good reputation , market share .
4 , microwave drying to maintain the original color intact .
5, the microwave drying setting and insecticide-treated simultaneously .
In order to ensure product quality , we require , without microwave drying of wood not allowed to use a long stick to do to improve the credibility of our products , I really appreciate the benefits of high-tech .
Furniture , especially in the production of solid wood furniture , wood drying is the most headaches. Learn liberated our country from the former Soviet Union and the introduction of timber processing methods steam drying of wood way still in use. Although the process is stable in this way , but the energy , time consuming, difficult to grasp for hard species , wood cracked , deformed , leading to decreased utilization of wood , can not meet the requirements.
For the above, we use the most advanced high-tech technology tools - microwave to dry the wood. After more than eight years of exploration and research , breaking the strong penetration of the microwave , the launch site balancing, as well as microwave sealing and other major issues , but after a small production experiment, and stereotypes kiln production. Through Furniture Factory , Ball lock factory trial were to meet customer requirements and the desired level.
Now introduce some of its features:
1 , basically the same temperature inside and outside timber .
As the penetration of the microwave timber, directly to intensify the water molecules to produce heat, so the internal temperature is also slightly outside the timber so that there can be maximum to avoid drying of wood with a conventional heating method of the temperature gradient and the deformation , cracking, shrinkage , etc. problem can significantly improve the utilization of wood .
2 , timber shape , and can be directly dried semi-finished wood .
The microwave drying of wood , wood can completely eliminate stress , so can dry after initial processing of wood products. Broke all furniture production process is the first board, wood Lumber drying after a good Poucheng parts for processing technology , to the first plate , wooden furniture construction material according to the needs , the first processed into a variety of straight , curve specifications , and then into the microwave drying .
This way, there will no longer be working in the corners more than expected ( about 30% ) drying and processing of sawdust , wood shavings ( approximately 15% ) are not into the kiln , which saves energy and improves the utilization of drying kiln ; addition, because the first cutting and then drying the wood no longer extend the original defect can improve timber utilization of 15% -20 %, and the very significant economic benefits .
3 , selective heating , drying speed, saving energy.
Microwave drying of wood is a significant feature is a selective , high moisture absorption of microwave many parts , resulting in heat, little heat is generated on the contrary , is within the overall timber with heat , no thermal inertia , there is no loss of heat transfer so faster than conventional steam-heated drying method more than 10 times faster , thus saving energy .
4 , can maintain the original color of the wood also insect sterilization .
Conventional drying method in humidity , a long time , the prevalence of lower dried material , color , black problem with the furniture is reduced by grade, due to the microwave short time , while the drying process of insecticide, sterilization , and the effect is significant , so wood is dried in the microwave , not color, not down grade especially valuable timber , the use of more ideal.
5 , can reduce the drying process , saving equipment investment and occupiers , to facilitate the user's operation .
Because the microwave drying of wood generally do not need soaking, cooking , steaming and other processes , only one piece of equipment to complete. Therefore, the device simplification, occupy less space , while process is simple and easy to achieve automatic control , operation, only the drying time set to automatically shut down . The whole process is not toxic gases or hazardous and noxious liquid efflux , therefore , are environmentally friendly equipment .
In addition to the five features, especially for microwave drying of wood timber initial moisture content of 25 %, and dry to a final moisture content of 10-8 % or less , and its drying costs 80 yuan / M3 or so, due to the molded semi-finished drying reduce cracking, deformation a timber can save more than 15% , which is more expensive than wood is more valuable to show its value , very significant economic benefits .
Therefore, China has strongly advocated protecting the environment , saving timber, save energy, reduce costs and eliminate pollution in the case of microwave drying of wood with its fast drying , dry good quality timber utilization characteristics, will be furniture and wood processing industry is widely used and show a bright future .

 

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