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Add:8 Chengtang Road(Chang'an)Huishan
Economic Development Zone,Wuxi Jiangsu Province,China
Contact：Jianchang Hua
Mobile：13306188288
Tel：(0510)83859060 83859070 83857090
Fax：0510-83859060
Post：214177
Wesite：www.browneyedgirlschina.com
Email：wxhjc5200@163.com
sales@wxhxjx.cn |
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Location：Home >> Products >> HDG48 Hot-pressing Dryer Products
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| HDG48 Hot-pressing Dryer |
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The machine is a new type of veneer dehumidity dry hot press which is based on many years experience and development of our company. It has already been proved by many customers in forestry industry to be a most efficient and energy saving dry equipment. It suits the dehumidification and flatting of the core boards. The veneer is very flat after drying with sufficient shrinkage. The synchronized closing device with lever spring is installed symmetrically at the hot press, this device can make the hot pressed plates between each layer and the cores can touch or separate at same time. The specially produced hot pressed plates enjoys below features:fast dehumidification and fast steam removing. The frame strcture is used for this device. The cylinder has upper oil inlet which can be installed very conveniently. The saturated steam is used as the heat
source to heat the hot pressed plates with high efficiency and low energy consumption. The automatic electric control system is used for the whole process of the dehumidification of the plates as per the set up programme. The operation is very simple.
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| Basic parameters |
ITEM NO.
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DESCRIPTION
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UNIT
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SPECIFICATION
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01
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NOMINAL GROSS PRESSURE
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(Tons)
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40
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02
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NORMAL OLL PRESSURE
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Mpa
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12.7
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03
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DIMENSION OF HOT PLATENS
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(mml×mmW×mmH)
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2700×1370×42
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04
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DISTANCE BETWEEN HOT PLATENS
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(mm)
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60
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05
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NUMBERS OF HOT PLATENS
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(p.c.)
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13
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06
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NUMBERS OF DAYLIGHTS
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12
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07
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CYLINDER
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(mm)
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4-Ф100
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08
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STROKE OFCYLINDER
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(mm)
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720
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09
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POWER
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(Kw)
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11
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10
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OVERALL DIMENSIONS
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(mml×mmW×mmH)
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5220×1734×2998
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11
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NET WEIGHT
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(Tons)
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23
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| The New Technique of Veneer Hot-pressing Drying |
Wood drying is one of the most important approach in wood processing, and it is also the key step in the production of plywood, basic wood of composite solid floorboard, container floorboard, man-made wood (technical wood). At present most companies make use of band dryer, roller dryer or manual dryer. The former two methods cost high, not only wasting electric power and heat energy, but are very likely to cause veneer split and broken. The last one requires large field and involves more staff; besides, the moisture content after drying is hardly controlled and guaranteed.
The purpose of wood drying is to extract water from wood. Generally the moisture content inside wood is higher than that outside on the surface. And during the heating, the external temperature is higher than the internal. Therefore, the movements of water from two opposite directions competes against each other, when the moisture gradient will force moisture to move from the internal out, yet the temperature gradient forces it to move into the veneer. Such competition gives rise to a slow movement area of water just in the vicinity of the surface, which resists and retards the drying process. The fundamental principle of drying is to accelerate the drying speed without sacrificing the drying quality. However, the conventional method can only accelerate the speed by increasing drying temperature. Fortunately, we have now a new hot-pressing drying technique as solution. Particularly processed platens are used to directly heat the veneer through contact conduction. Due to the high temperature, and the close contact large quantity of heat is conducted. Thus instantly broken though is the slow moving area of water inside the wood, whose temperature becomes high, and whose vapor pressure instantly increases. This will accelerate the movement of water from inside to outside. In order to ensure that large amount of water inside a large wood piece can be discharged immediately, large numbers of breathing grooves are made on the platen to facilitate the exhalation. As a result, quick drying can be achieved. This technique is proved effective especially for hardwood and serayah.
Because of the pressure, the dried wood will experience more shrinkage than normal, with density increased, board size stabilized and veneer leveled and straightened. Yet, excessive pressure will bring about not only more wood volume loss, but surface rigidified or split. To solve such problems, synchronic closure system is devised for the closure set with multiple platens. Then equal closure time between each two platens and equal pressing force onto the veneer can be realized. Moreover, the pressure can be adjusted freely by the hydraulic control system.
During the drying process, a certain amount of shrinkage will occur along with the decrease of moisture content. Different types of wood will have different shrinkage rate. Thanks to the contact pressing, veneer may split if the platen and veneer cannot separate with each other immediately. The synchronic closure system can solve this problem. This platen dryer deploys the PLC system to control the breathing process of veneer drying. It can adjust breathing frequency and duration according to respective conditions; thus ensure a complete shrinkage and exhalation.
Veneer hot-pressing dryer, compared with conventional band or roller dryer, is electricity-saving (power at 11 KW), heat-saving (heat consumption at300,000～ 400,000 Kilocalorie), workshop area-saving (10 M2), and it is also characterized by high production efficiency (daily veneer drying at 20m3), easy-maintenance, and low daily damage. And the popularization of this machine will be a breakthrough to the veneer drying technique. |
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