Views: 64 Author: leo Publish Time: 2022-07-06 Origin: Shandong Jinlun Machinery Manufacturing Co,Ltd
Veneer dryer press to veneer heat transfer can be divided into the following categories:
1, air convection dryer: It conveys heat through the way of the hot air to the veneer, veneer drying. Such as a variety of belt dryer.
2, contact dryer. It is the hot steel and veneer contact, the heat directly to the veneer, veneer drying. Such as the development of hot plate dryer abroad, its advantages are: dry veneer formation, high thermal efficiency, drying speed, energy saving more than 36% of drying heat.
3, radiation dryer: The use of microwave, infrared (including far infrared) and other radiation can be used as a heat source, the veneer drying.
Microwave energy is a type of electromagnetic radiation energy that is commonly used for wood drying at 915 MHz and 2450 MHz at wavelengths of 0.328 and 0.122 meters, respectively. Microwave drying mechanism is usually interpreted as microwave electric field caused by the dipole of the water molecules arranged in the board, with the rapid rotation of the electric field, resulting in friction heat and water evaporation. As a result of a few days ago technical conditions, microwave drying costs are higher, so the veneer drying rarely microwave drying.
Infrared (including far infrared) is also an electromagnetic wave, their wavelength of 0.76-400 microns, with the general characteristics of light, can be radiated, directed, into and absorbed into heat. Far-infrared features that its wavelength is essentially the same as the wavelength of molecular motion of wood and water, all in the 3-16 micron range, so that far-infrared rays can strongly resonate with the molecular motion of wood and water and that wood can be most effective To absorb heat radiation energy, so the use of far-infrared drying veneer than ordinary infrared has a higher thermal efficiency.
The use of electricity to produce infrared, far infrared, consume too much energy. The borides, carbides, metal oxides and other formulations made according to a certain percentage of paint, painted on the heater surface made of infrared radiation components, you can use steam, direct combustion gases and other heating radiating elements to produce infrared, which is a A more economical way. At present, the infrared veneer drying is still under test. Some people think that it is possible to use a large number of infrared dryers that are heated with combustion gases.
4. Compound dryer: the above several ways of composite drying. For example, roller dryer heat transfer is a convection-contact compound heat transfer.
In another example, in order to speed up veneer drying process, an infrared drying device may be added in front of an ordinary dryer feed end; in order to improve the quality of the veneer drying, the microwave drying method can be used to dry veneer moisture content Select the characteristics of heating in the ordinary dryer behind the microwave drying device installed on the board to add drying to achieve the purpose of uniform moisture content. Both of these compounds have been used in some plywood plants in North America.
Veneer dryer delivery method according to the veneer, but also can be divided into two kinds of roller dryer and belt dryer.
At present, China is currently the most widely used convection heat transfer belt dryer and compound heat transfer roller dryer. Hot plate dryer contact heat transfer is rarely used.
Mesh belt dryer structure is simple, easy to manufacture, steel consumption less, jet dryer with network drying speed, can be horizontal into the board, using the first dry after the advantages of cutting technology. Its disadvantage is: veneer drying poor flatness, mesh belt running easy deviation and damage, the maintenance workload.
Drum tumble dry veneer formation, good quality, reliable operation of the equipment, less maintenance work, the disadvantage is the more complex equipment manufacturing, steel consumption more than the existing structure of the roller dryer, only vertical Into the board, and veneer thickness must be more than 1 mm clothing in order to successfully pass.
Shandong Jinlun Machinery Co., Ltd. is a modern wood veneer peeling machine manufacturer specializing in the production of the spindle-less wood veneer peeling machines. It is also the earliest large wood veneer peeling machine manufacturer in China that integrates design, development and production. Company has served thousands of domestic and foreign veneer, plywood manufacturers, is the first wood veneer peeling machine manufacturer that gain European CE certification. Products are sold to the Europe, Americas, Southeast Asia, Middle East and Africa, more than 40 countries and regions .With high visibility and market share at both domestic and abroad. The main products are: 4-foot, 8-foot wood veneer peeling machine and automatic peeling line, can be customized according to customer special needs. Company can supply full set veneer peeling and plywood production programs. Companies focus on produce "better wood veneer peeling machine." Welcome friends from domestic and aboard visit our factory and make the win-win cooperation.