| 摘要 |
<p>Method for making upholstered packaging material consists of laying a flat sheet of polyethylene on a flat sheet of packing paper, then applying a layer of expanded polystyrene beads over this then superimposing a further polyethylene sheet and a sheet of packing paper, finally, heated dies are pressed onto the composite material, welding all the components together beneath the contact areas. Pref. a revolving heated drum with projections welds the layers together at intervals as they pass beneath it.</p> |
