The Liquid Flame Proofing Agent's Permeating Effect of Wood Using Microwave

Abstract

By implementing an analysis on the liquid flame proof agent infiltration of microwave-heated wood under soaking conditions (room temperature soaking, heat soaking), its correlation with wood temperature, and the structure of wood and permeating components after soaking in flame proof agent, which was carried out as basic research in order to improve the fire resistance performance of the wood itself, it is found that the infiltration increases as the microwave heating time increases, while for heat soaking, it is found that high infiltration as well as the stable permeability of flame proof agent is achievable. Also, when the wood temperature is more than 80℃, the infiltration by the flame proof agent increased, and a very even infiltration of flame proof agent was observed, which implies that the liquid flame proof agent has a dependency on temperature change of the wood as a condition to penetrate into the wood. As a result of fine structure analysis, the flame proof agent transfer between cells through pits was considered as a cause to increase the infiltration of flame proof agent, and it is also shown that for heat soaking among the permeating component analysis, as the crystallized flame proof agent around the heartwood and sapwood inner pits increases, the flame proof agent can penetrate into the the heartwood part.

Flame Retardancy of Wood Products by Spreading Concentration and Impregnation Time of Flame Retardant

“…The amount, method, and number of applications to analyze the flame retardancy with different spreading concentrations were determined based on the results of preceding research on commercial flame retardants (Son and Han, 2014;Seo et al, 2017). It was determined to apply 300 g/m 2 and 500 g/m 2 to the Korean pine plywood, Japanese larch plywood, and Japanese the conditions of a precedent study (Lim et al, 2008;Park et al, 2011Kim et al, 2013) where the specimens were immersed for each treatment time in containers providing complete submergence of the specimens at a temperature of 23 °C and a humidity of 50%. Refer to Table 2 for the flame-retardant treatment methods.…”

“…Anti-inflammatory treatment methods include: application, which sprays or directly coats flame retardants on the surface of the wooden material, lining, which attach metal plates or other non-combustible materials, and impregnation, which penetrates flame retardants into the wooden material, depending on the characteristics of the combustible material (Kim and Hyun, 2009;Cha et al, 2011). For wood materials and wooden products, the anti-inflammatory method of spraying or brushing flame retardants has been typically used after the materials or products are installed in the structures (Min et al, 2012), and research has been conducted on flame retardant impregnation times from 10 minutes up to 240 minutes to apply the impregnation method (Lim et al, 2008;Park et al, 2011;Kim et al, 2012;Kim et al, 2013). As it was reported that application of commercial retardants to a Korean red pine is more effective than impregnation (Choi et al, 2011), research is required to present appropriate treatment methods for different types of flame retardants and treated materials.…”

Compressive Shear and Bending Performance of Compressed Laminated Wood after Microwave Heating

“…The specimen manufacturing process is as follows. First, the previous studies [3,4] were reviewed to understand changes in temperature and moisture according to the microwave heating Since then, the use of composite materials structures has spread. But most of the domestic need has been fulfilled by foreign products, and the production companies are usually small, which has been a great obstacle to the widespread adoption of laminated wood for structures.…”