Hot pressing exhaust device in artificial board manufacture process and hot pressing exhaust method

Abstract

A hot pressing exhaust device in an artificial board manufacture process comprises a membrane base plate and a hydraulic pressure and oil supply mechanism. The membrane base plate comprises two layers of elastic metal boards which are laminated together, strip-shaped gap ways communicating from front to back are arranged between the two layers of elastic metal boards at intervals, and oil inlet and outlet collection pipes are respectively arranged at the front ends and the back ends of the strip-shaped gap ways to be communicated with all the strip-shaped gap ways. The hydraulic pressure and oil supply mechanism comprises a hydraulic pressure station, a large oil cylinder, a small oil cylinder and an oil tank, wherein the large oil cylinder is connected with the hydraulic pressure station to form a loop, the small oil cylinder, the membrane base plate and the oil tank are serially connected to form a loop, and piston push rod ends of the large oil cylinder and the small oil cylinder are both fixed on the same connection plate. A hot pressing exhaust method is implemented through the hot pressing exhaust device. By using the hot pressing exhaust device and the hot pressing exhaust method for hot pressing exhausting in the artificial board manufacture process, hot pressing defects are eliminated, product quality is improved, hot pressing time is shortened, and production efficiency is improved.

Description

technical field [0001] The invention relates to the production of wood-based panels, in particular to a hot-press exhaust device and a hot-press exhaust method in the process of making wood-based panels. Background technique [0002] The process of making wood-based panels requires a certain amount of moisture in the raw materials. When pressing the slabs, a higher temperature and pressure must be obtained at the hot-pressing plate. When the preset density is reached, the slabs are compacted into wool. plate. During this process, some high-temperature and high-pressure water vapor will be generated in the core of the wool board. After the hot pressing is finished, the press is turned on, the hot pressing plate is removed, the external pressure of the raw board disappears, the pressure gas in the board will expand rapidly, and a pressure layer is formed in the board. Even all of them accumulate a high outward expansion force. When the expansion force exceeds the strength th...

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Problems solved by technology

[0003] The moisture content of the slab has a great relationship with the performance of the board. In order to achieve fast heat conduction and steam impact effects (effects) in the process, and further improve the performance of the board, it is also hoped that the moisture content will be higher, but high moisture content and hot pressing Defects are a pair of contradictions, how to solve them requires a new method

Due to the existence of the pressure P, the hot-pressed plate will always stick together with the raw plate without gaps. Although the pressure is reduced, it is difficult for the gas to escape from the surface of the plate, and the main channel is the edge of the plate. Movement, due to the large format of the board, the distance from the center to the edge is very long, and the exhaust resistance is large. If the release is to be fully released, the time must be prolonged, and a pressure gradient and a moisture gradient will be formed in the board, which will affect the quality of the board. cause adverse effects

[0005] There are still some methods to solve the defects of hot pressing, mainly to reduce the moisture of raw materials, but the problem of low moisture is that drying raw materials consumes a lot of energy, and poor heat transfer is not good for board making. The moisture of the finished board is too low, and the board surface is easy to deform

Therefore, it is very difficult to improve the quality of wood-based panels and solve hot-pressing defects by using existing techniques and equipment.

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