| 摘要 |
<p>The structured foam wallpaper material has an embossed surface, using a web of closed-cell foamed polystyrene, polyolefin such as polyethylene or polypropylene, or a polyester, with an adhesive layer and a paper web. The water absorbency of the compound material is at least 0.15 ml/g in 10 mins. Also claimed is a mfg. process where the foam web is mechanically trimmed by 0.15-7.25% directly before bonding to the paper web. The extruded adhesive film (9) is applied to the paper web which is passed directly through a roller gap together with the foam web. On subsequent embossing, both surfaces of the compound material are structured, and the foam web thickness is reduced by 10-90%. Pref. on water absorption, the paper web takes up 99.5-80% and the embossed foam layer takes up 0.5-20% of the absorbed water. The paper web is an unglued paper with at least 30 vol% of open pores of the total paper vol. The paper weight is 50-150 g/m<2>. The embossed foam layer (15) has a differing thickness of 0.1-1.2 mm, with a compressed skin (16) near the foam surface (12) with torn cell walls (17). After the centre, the cell structure (18) is coarser and opened out against the non-embossed foam web. It has an even fine cell structure (19) in the zone near the thermoplastic adhesive film (9).</p> |
