| 摘要 |
<p>A one- or multi-layered seamless tubular casing which is permeable to smoke, characterized in that at least one layer of the seamless tubular casing comprises a mixture of polyamide and natural fibres and optionally additives, wherein the sum of the layer thicknesses is between 5 and 200 mum and the permeability of the seamless tubular casing to water vapour, in accordance with ASTM F1249-01 at a temperature of 23° C. and a relative atmospheric humidity of 85%, is at least 25 cm<SUP>3</SUP>/(m<SUP>2</SUP>xdayxbar), is described.</p> |
