| 摘要 |
<p>The invention relates to a process for producing a sandwich board, compri sing the following steps: providing an upper covering layer, providing a low er covering layer, providing an intermediate layer arranged between the uppe r and lower covering layers, compressing the upper and lower covering layers , and foaming the intermediate layer, in which process no foaming of the int ermediate layer takes place at the start of compacting the upper and lower c overing layers.</p> |
