| 摘要 |
A method of packaging steel and other articles wherein the articles to be packaged are first enclosed in a flexible sheet of material such as polyethylene and are then encapsulated in a cellular plastic sheath in a mold by placing a liquid foamable reaction mixture in the mold under confinement and at resulting conditions of elevated temperature and pressure. The flexible sheet enclosure is vented to atmosphere through the mold wall so that, as the foamable reaction mixture expands in the mold, there is no blockage by bubbles of air inside the flexible sheet enclosure.
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