| 摘要 |
<p>Ths invention relates to a method of making a foam-containing structure which includes placing and suitably retaining a respective shaped sheet in each of first and second complementary parts of an open mould. Each sheet includes at least one layer of fibrous material and on that face thereof remote from the respective mould part at least one filter layer. When the two mould parts are closed together a foamable material is introduced into a cavity formed between the sheets and is then caused to expand. Some of the expanding material passes through the filter layers into the fibrous material, the characteristics of those layers being so chosen as to produce a desired extent of penetration of the expanding material into the fibrous material.</p> |
