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Heat insulating cardboard composed of corrugated foamed polystyrene layer

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Foamed polystyrene boxes are widely used in low-temperature physical distribution today. They have, however, a big problem with the way they are disposed of after use. On the other hand, corrugated cardboard boxes, which are low-priced, lightweight, collapsible and less bulky, have almost no problems of disposal after use, although they cannot adequately keep the contents fresh because of their inferior heat insulation and water resistance. To find a solution to these problems, we have developed a heat insulating cardboard consisting of a corrugated foamed polystyrene sheet core covered with a paperboard liner on both sides. We have also established technology for continuous production of long-sized material with the purpose of commercializing it through mass production. Tests to determine the basic characteristics revealed that the new cardboard material is equal to conventional cardboard in calorific value when burned, as well as in usability and decorative capacity and that it displays far superior heat insulation and moisture resistance. In transport tests on cut flowers and a processed marine product, it was also confirmed that the new material excels in the performance of preserving the freshness of the contents. Furthermore, a recycling test proved that the material is recyclable as waste paper. Copyright © 1999 John Wiley & Sons, Ltd.
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Keywords: continuous production process; corrugated foamed polystyrene sheet; heat insulating cardboard; preservation of freshness; recyclability

Document Type: Research Article

Affiliations: 1: The Japan Packaging Institute, 10F Togeki Building, 4-1-1 Tsukiji, Chuo-ku, Tokyo, 104-0045, Japan 2: Nihon Dimple Carton Co., Ltd., 1-8-11 Kojima, Taito-ku, Tokyo, 111-0056, Japan

Publication date: 1999-05-01

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