| 摘要 |
The laminated fabric comprises a melt-blown layer 22 and at least one spun-bond layer 24, 26, preferably as an SMS sandwich. The melt blown layer 22 comprises fibres having diameter > 3 (3.8-4) µm. The laminate has air permeability > 65 (80-100) l/m2/s, and preferably hydrostatic head = 50-100 cm. The basis weight is, preferably, 10-60 g/m2 for the melt blown layer 22 and 15-150 g/m2 for the spun bond layers 24, 26. The preferred laminate has pore size ³ 20 µm, contains fluorocarbon hydrophobic melt additive, ultra violet stabiliser, fire retardant, pigment or plasticiser, and is formed using a point bonding calendering process. The preferred fibres are polyolefin, especially polypropylene. The laminate is used in an unsupported, non-vented, cold pitched roof. |
