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구조용 복합 판넬의 강화섬유 길이와 섬유함유율이 기계적 성질에 미치는 영향
박승리(Seung-Ri Park) 산업기술교육훈련학회 2016 산업기술연구논문지 (JITR) Vol.21 No.4
This paper describes effect of chopped strand length fiber content and moisture absorption on mechanical properties of fiber-reinforced polymeric composites. It was extrusion compounded long fiber-reinforced polypropylene containing 20, 30 and 50 percent and short fiber-reinforced ABS and PA6 containing 30 percent by the weight of glass fiber. The test methods of ASTM D638, D3410-87 and D790M are applied for tensile, compressive and bending tests, respectively. The results show that the residual strength decreases dramatically, in the case of 0.2% moisture absorption.
호흡성 과일의 예냉 제습기 및 이를 이용한 예냉 제습 방법의 적용성 검토
박승리(Seung-Ri Park) 산업기술교육훈련학회 2016 산업기술연구논문지 (JITR) Vol.21 No.4
The fruit is divided into respiratory and non-respiratory fruit. Each time a temperature rise of 5°C fruit increased 1.6 to 2.0 times the amount of tidal volume, and is shown to decrease 50∼70% when the temperature drops 5 ℃. Lowering tidal volume by decreased temperature induce metabolic depletion, and prevent material reduction, weight reduction, and eventually deterioration. In this paper, we made the pre-cooling-dehumidifier using differential pressure method and tested in various way. We evaluated the amount of temperature reduction. It brings to make farmers’ income increased and environmental pollution decreased.