Oji Paper, one of Japan’s leading paper companies, developed a water-resistant cardboard box to ship big fish like tuna with ice in collaboration with Kinki University that has been making strenuously efforts to establish a system for complete farming of tunas. The newly-developed cardboard box hardly sorbs water and can contain a heavy load up to 100 kg. A standard cardboard box absorbs 300 grams water for every square meter and loses shape if it is immersed in water for 30 minutes, but this new cardboard box absorbs only 3 grams of water even if it is immersed in water for 30 minutes and bears 2.5 tons for every square meter. The company applied special synthetic resin to the multilayer paperboard that hardly absorbs water. It examined the durability and usability of this new cardboard box with Kinki University. This water-resistant cardboard box will be put on the market at nearly the same price of polystyrene foam. Wooden boxes and polystyrene foam boxes are widespread to ship big fish, but the new water-resistant cardboard boxes can replace them because they can be easily fabricated in the field and recycled as used paper.
Related web page: http://www.ojipaper.co.jp/english/index.html