Now manufacturers in the production of fire-proof board is a water heat treatment process, water heat treatment is to enhance the performance of fire-proof board products, but in this process there will be wood end radial cracking and ring cracking problems, this will affect the quality of fire-proof board, then fire-proof board in the water heat treatment when the reason for cracking? In fact, there are two reasons for the cracking of the fireproof board, as follows:

一、是在水熱處理中，由于木材孔隙很多，導(dǎo)熱能力很差，因此熱量是由表面向逐漸傳遞，溫度也是由表面向逐漸降低，形成溫度梯度，這時如果加熱速度過快，就會出現(xiàn)木材表面部分溫度高，已受熱膨脹，而木材內(nèi)部溫度較低，未膨脹或膨脹甚少的現(xiàn)象，當(dāng)木材內(nèi)部的應(yīng)力超過了木材橫紋方向的抗拉強(qiáng)度時，就引起木段端頭的縱向開或是環(huán)狀開裂，嚴(yán)重影響防火板的質(zhì)量以及出板率。
             

1、 In the hydrothermal treatment, due to many pores and poor thermal conductivity of wood, the heat is gradually transferred from the surface to the center, and the temperature is also gradually reduced from the surface to the center, forming a temperature gradient. At this time, if the heating speed is too fast, the surface temperature of wood will be high, and it has been heated and expanded, while the internal temperature of wood is low, and it has not expanded or expanded very little When the stress inside the wood exceeds the tensile strength of the wood in the direction of transverse grain, it will cause the longitudinal opening or ring cracking of the end of the wood section, which will seriously affect the quality and yield of the fireproof board.

二、是木段從煮木池中取出，如果冷卻速度過快，也是會產(chǎn)生同樣的缺陷，出現(xiàn)這種缺陷以后的木材會影響防火板質(zhì)量，導(dǎo)致防火板價格會受到較大的影響。

2、 If the cooling speed is too fast, the same defect will occur. The quality of fireproof board will be affected and the price of fireproof board will be greatly affected.

綜上就要求所有的防火板在做水熱處理的時候，一定是要控制好溫度，謹(jǐn)防木材出現(xiàn)開裂的現(xiàn)象，進(jìn)而影響防火板質(zhì)量。

To sum up, it is required that the temperature of all fire-proof boards must be well controlled when they are subjected to hydrothermal treatment, so as to prevent the cracking of wood, which will affect the quality of fire-proof boards.