Seog Goo Kang

Physico-mechanical Properties and Optimum Manufacturing Conditions of Bi-Sn Metal Alloy Impregnated Wood Composites

ABSTRACT In order to improve the dimensional stability and durability of wood, this study attempted to impregnate bismuth (Bi) - tin (Sn) alloy metal with low melting temperature into solid woods of three species such as radiata pine, redoak and white oak, and investigated to determine an optimum condition of manufacturing the metal alloy-wood compo-sites with natural wood grains. These Bi-Sn alloys were chosen for this study because they were harmless to human and melting at low temperatures. The composites resulted in high dimensional stability and low thickness swelling, and also showed much improved performance such as high bending strength, high hardness, high electric conductivity, andhigh thermal conductivity as floor materials. A proper impregnating condition of all specimens was determined as 10minutes of the preliminary vacuum time, and 185℃ of the heating temperature. The proper processing condition forradiata pine wood was 2.5 minutes of the pressuring time at the pressure of 10 kgf/cm

The Study on Physical and Mechanical Properties of Composite Board, Using Byproduct of Plywood for Core Layer

폐목재의 재활용으로 인한 보드의 물리 기계적 특성이 하락하는 경향이 있다. 그 원인으로는 가공되어 있던 재료를 재활용함에 있어 그 형상이 불균질하고 기존의 접착제 성분과 이물질로 인한 보드 품질의 불균일과 저하를 초래한다. 또한 접착제에 포함되어 있는 포름알데히드로 인해 높은 방산량을 가지게 된다. 이러한 제품의 질적 하락이 수입되는 파티클보드와의 가격 및 품질 경쟁력 약화로 이어져 국내 보드 산업의 문제점으로 대두되고 있다. 따라서 본 연구에서는 최근 파티클보드의 원재료로 사용되고 있는 합판 정재단 부산물을 이용한 보드를 제조하고 각각의 제조 조건별 물리 기계적 특성을 평가하였다. 그 평가결과로 베니어 적층 복합보드를 EMDI 수지를 이용하여 4~16 mesh의 일반적인 chip 크기로 중층을 제작했을 때 휨강도가 57.7

Properties of Particleboard Using Byproduct of Plywood Manufacture - Evaluation on the Elements of Surface Layer and Pre-treatment of Particles

N/mm^2

A Study on Deflection Characteristics of Plywood for Wood Based Flooring by Veneer Composition

로 OSB 측정결과 26.8

Ultrasonic Properties of Phyllostachys bambusoides Sieb. et Zucc depending on Three directions

N/mm^2

Nondestructive evaluation of bending strength of wood with artificial holes by employing air-coupled ultrasonics

에 비해 215% 높은 휨강도를 나타냈으며 7.1~17.3%의 두께팽창률은 내수성을 지닌 보드로서 적합함을 보였다. 또한 0.7 ppm의 포름알데히드 방산량은 E1등급의 평균값 1.5 ppm과 E0 등급 최대값 0.7 ppm의 조건에 충족하며 이러한 결과는 바닥 깔개용 OSB를 대체 가능할 것으로 사료된다. 【The board using recycled wood waste chip tends to decrease in terms of physical and mechanical properties. The reasons are notably different shape of chips, components of used adhesive and impurity content, which bring the irregular quality and downgrading of board. More over, the board has higher emissivity of formaldehyde than regular board, because recycled chip contains adhesives that were used to make previous products. This low quality of products weakens the price and quality competitiveness, and it led to bringing the issue of problem in Korean board industry. For these reason, in this study, boards using byproducts of plywood were made to evaluate physical and mechanical properties according to manufacturing conditions. As a result, The board was consists of 4~16 mesh chips for core layer and veneer on both face and they were combined using EMDI, and its bending strength was 57.7

A Study of The Heating and Energy Efficiency of Thermally–Modified Firewood

N/mm^2

Deflection Characteristics and Heat Transfer of Plywood for Wood–based Flooring by Cross–band Veneer Composition

which is 215% higher than that of OSB (26.8

Method for producing hybrid woody core laminate lumber

N/mm^2

A mathematical model of the moisture gradient in air-dried square heavy timbers of Japanese red pine

). Moreover, the emissivity of formaldehyde was 0.7 ppm, this board seems to substitute OSB for rated sheathing.】