Traditional hot pressing technology in Chongming area

High frequency generator, also known as high frequency, is the core equipment of medium heating. The equipment adopts 380V and 50Hz three-phase AC power supply, which can generate high-frequency oscillation of 6.78MHz, 13.56MHz or 27. 12MHz. High-power high-frequency electric field is applied to the workpiece (such as laminated plywood and laminated wood to be heated) through the medium, which selectively acts only on glue molecules in the workpiece, and dielectric molecules are used under the action of high-frequency electromagnetic field.

High-frequency medium heating belongs to direct heating, which has many advantages compared with traditional conduction heating:

1. The heating speed has nothing to do with the thermal conductivity of the material, which will increase when the power is on and stop when the power is off, so the heating speed is extremely fast and the process is easy to control;

2. Heat evenly. Using high-frequency heating, due to the strong penetration ability of electromagnetic field, the electric field can be uniformly applied to the whole part of the object, so that all parts of the object are evenly heated;

3. It has certain selectivity. Because the dielectric loss of different objects is different, if we choose the frequency and arrange the objects according to certain rules, we can heat a certain substance in the same electric field (such as wood gluing, we can make the wood itself basically not hot and only heat and cure the glue);

4. It is conducive to automation and industrial production, improving working environment and reducing labor intensity.

In this process, because the dried wood does not absorb energy, the energy of electric field can be concentrated, with less loss, high efficiency and fast heating, so it quickly becomes the first choice equipment for furniture production, wood processing and related industries. In principle, all wooden devices bonded with glue can be heated by high frequency. At present, the products produced by heating with high-frequency equipment are: curved wood, integrated wood board, solid wood door and window splicing, artificial wood, wood sole, furniture frame bonding, wood strip edge sealing, sound four-corner bonding, musical instrument parts and so on. You can use cold pressing directly. The company's high-frequency generator has been tested by the national authoritative organization, which fully meets the requirements of high-frequency radiation in the national environmental protection standards.