Analysis of Flame Retardant Treatment Technology of Wood Fire Door

As a door to life safety in fire escape, fire doors play an indispensable role in preventing the spread of fire. The fire door is able to prevent the spread of fire, the secret lies in its surface of the flame retardant liquid. Then, in the production process, how are manufacturers fire-retardant wood fire doors? Next, the author briefly discusses the flame retardant treatment technology of wooden fire doors.

Flame retardant treatment technology of wooden fire door

The fire-retardant quality of wooden fire doors relates to the fire-resistance limit of wooden fire doors. Therefore, many fire door manufacturers set up this process as a special process control point in the production process. However, due to the lack of mature process regulations in the flame-retardant process, each The fire-retardant technology of the manufacturers is different, and the flame-retardant technology is not reasonable, and the flame-retardant quality cannot be guaranteed. In severe cases, the fire-resistant door fire-resistance limit is reduced, and potential hazards to people's lives and property are caused.

Common fire-retardant methods for wood include spraying, soaking, cooking, vacuuming, vacuuming, and the like. Spraying and immersion methods are generally applied to wood surfaces that are no longer subject to planing, and sheets with a thickness of less than 10 mm are flame-retardant and do not apply to the production of wooden fire doors. Although the vacuum method and the vacuum press method are excellent in the flame retardant effect, they have not been used in fire door manufacturers because of their expensive equipment. At present, fire doors are mostly fire-retarded by cooking. The author believes that the following points should be taken into account when using the steaming method for flame retardant treatment:

1, to be fire-retardant wood also does not have to be fire retardant wood moisture content is an important factor affecting the quality of wood fire-retardant. Because dry wood tends to absorb flame-retardant liquid more easily after it enters the flame-retardant pool, the amount of flame-retardant fluid absorbed by wood directly affects the fire-retardant quality of the wood, and its absorption is directly proportional to the oxygen index and flame-retardant depth of the fire-retardant wood. relationship. The more wood absorbs the flame retardant liquid, the better the flame retardant performance of the wood, the higher the oxygen index and the deeper the flame retardant depth. However, many companies believe that anyway, when wood is fire-retardant, it must be soaked by flame-retardant liquid. Therefore, the low point of wood moisture content is not of much concern. Fire-retardant wood is generally not dried, and individual companies even The newly sawn wet wood is fire-retardant. I do not know that the moisture content of wood just affects the quality of flame retardant, resulting in unstable fire-retardant wood flame-retardant quality. According to experiments, under the same flame-retardant conditions, wood with a moisture content of less than 15% can increase more than 5 oxygen indexes and a flame-retardant depth of more than 3 mm, compared with wood with a moisture content of more than 40%.

2, after the first flame retardant water and then the wood in the flame retardant process, most manufacturers are using wood → flame retardant → → water → start the order of flame-retardant. Generally speaking, the beginning of wood is the time when the maximum amount of water is absorbed. The use of this process often causes the wood to absorb the low-concentration flame-retardant liquid. In the process of wood fire retardation, it also needs a concentration of flame-retardant liquid absorbed by the wood. The process of excessively low concentration to normal concentration directly affects the dry salt absorption and absorption rate of wood, and thus affects the flame retardant effect. With the addition of flame retardant → water addition → wood loading → the order of starting flame retardancy, the wood absorbs the standard concentration of flame retardant liquid at the beginning, thereby avoiding the excessive absorption of flame retardant liquid from the low concentration to the normal concentration. , And then improve the quality of fire-retardant. If the company has conditions, it can be first formulated into a flame retardant liquid with a predetermined concentration and then added to the fire-retardant pool. The flame retardant quality will be better.

3. Capping flame-retardant, reducing the evaporation rate of flame-retardant liquid In our normal flame-retarding process, the process of heating and cooking is generally exposed, resulting in too rapid evaporation of the flame-retardant liquid, often a flame-retarding process requires constant resistance. Add water to the burning pool. The flame-retardant solution absorbed by the wood is dissolved from a high-concentration state to a low concentration, reabsorbed to a high concentration, and re-dissolved to a low concentration, thereby reducing the dry salt content of the flame-retardant liquid absorbed by the wood. However, if the flame retardant is used, the first step is to avoid adding raw water during the flame retardant process, and the second is to ensure that the concentration of the flame retardant liquid in the flame retardant pool does not fluctuate, and the third can also save energy. If you still cannot avoid adding water in the middle, you should also add a good flame retardant to ensure that the concentration of flame retardant liquid in the flame retardant pool is constant.

4, at room temperature discharge many fire door manufacturers in the wood flame retardant process is often the time as the standard for flame retardant, in accordance with the requirements of the operating procedures to achieve the required time, the time to immediately discharge. In this way, the workers are too hot to prevent labor protection in the process of operation. More importantly, during the process of cooling the wood by heat, the internal cells of the wood produce a certain negative pressure due to thermal expansion and contraction, and the flame-retardant wood is used. It will further absorb the flame retardant under the effect of negative pressure, thereby improving the quality of flame retardant treatment.