コンテナ内貨物の汗ぬれ損傷に対する防止策-I : 化学吸着型シリカゲルの効果

概要

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Sweat damages frequently occur for the cargos, agricultural products, loaded in containers that transported from tropical and southern countries during winter season in Japan. Recently, we have elucidated the sweat phenomena by simulating the heat and vapor transfer, and then the time-dependent change in the amount of dew on the ceiling of a container. The previous report showed that the keeping the container in static conditions for 1-4 days prevents the cargo from suffering the sweat damages. In this paper, we investigated the effect of the chemical absorption type silica gel on the prevention of the sweat damages, and simulated the circumstance in the container loaded with soybean and silica gel. The silica gel continuously performed as a dehumidifying agent during transportation, but the influence on the cargo was limited mainly in the upper surface of soybean bulk. In cooling process, after arrival in winter Japan, the silica gel became active again. The addition of 10kg and 20kg of silica gel per 1m^2 reduced the maximum weight of dew to 60% and 35%. It is important where the silica gel is set. When the silica gel was fixed in the lower air layer, it did not affect the amount of the dew on ceiling. These results show that the addition of the silica gel would reduce the amount of dew by the consideration of the place where it was set.
社団法人日本航海学会の論文
2002-09-25