| 摘要 |
Marginal edge portions of two spaced apart flexible sheets are folded inwardly and joined to form an envelope. A plurality of laterally extending substantially rigid panels divide the envelope into a plurality of partitioned compartments. Each panel is angularly disposed relative each adjacent panel and the panels are fixed to the envelope, thereby providing a semi-rigid structure. Fibrous insulation material, especially cellulosic material such as treated ground paper, is contained in each compartment.
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