Flame Resistance and Durability of Compressed Structural Wood through Microwave Heat Drying Method

Abstract

As the result of implementing a treated material test and durability test after quickly drying S.P.F. species, a type of softwood structural material, within a short period time, soaking it in liquid phosphate flame proof agent for an hour, microwave heating it, and compressing it from 3.8㎝ to 1㎝, when setting the appropriate heating time of microwave heating at 7 minutes at 5㎾, it is observed that it satisfies the target water content (4～5%). It is shown that in a water content measurement of the wood that is compressed after being softened by soaking in the flame proof agent, drying and heating at 3㎾ for 9 minutes, all specimens satisfied 12～14%, the appropriate water content for exterior wood. Also, it is shown that in terms of the flame performance obtained through a flame resistance treatment of the compressed wood and a treated material test, the specimen soaked in flame proof agent for 30 minutes was the most excellent, and that the performance test result of the compressed wood in all areas, such as nail withdrawal resistance, compression, bending strength, and shearing strength, were all improved in their mechanical features to twice to three times better performances.

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.…”

Moisture Content Change and Heat Distribution Characteristics of Veneer Heated by Microwave

“…하지만, 얇은 단판을 건조하기 위한 방 법으로 일반적인 열기건조를 할 경우, 건조시간 증 대, 단판의 뒤틀림 및 갈라짐 등 결함이 발생되거나 건조 이후 2차제품 제조시 어려움이 발생하는 등의 문제로 얇은 단판의 무결함급 건조 방법에 대한 선 택과 검증이 필요한 실정이다. 한편, 목재의 건조방 법 중 마이크로파를 이용한 건조의 경우 목재 가열 시 일반적인 열기건조와 반대의 함수분포를 가지는 것이 일반적인 특징이며, 건조 품질이 우수한 제품 제조가 가능한 것으로 선행연구를 통하여 나타나고 있다(Yoon et al 2013;Lim 2011).…”