| 摘要 |
1474348 Fibrous laminates KENDALL CO 8 Sept 1975 [17 Sept 1974] 36906/75 Heading B5N [Also in Division D1] A plaid effect laminate fabric, Fig. 5, is produced by cross-laying two layers of a staple fibre non-woven fabric comprising areas 12, Fig. 1, of relatively low fibre density having a finger-like configuration with a majority of the fibres therein orientated in a direction substantially normal to the fingers, and immediately adjoining areas 11, 44 of relatively high fibre density in which a majority of fibres are orientated in a direction substantially parallel to the fingers. The fabric is formed by air laying drafted staple fibres on to a moving air permeable conveyer screen 22 having impervious finger-like resist areas disposed on or over the screen, by suction applied at 29. In Fig. 2 fixed finger-like striping bars 23 are disposed across the width of the screen with the distance between the edges of the bars less than the fibre length, preferably less than half the average fibre length. If the bars are close together the fabric has a ribbed profile. Alternatively the bars are arranged perpendicular to the machine direction. The bars may not cover the whole width of the screen to produce a fabric having a zone of random fibre orientation. The resist area bars may be replaced by impervious areas formed on the screen by placing strips of tape on the screen or by blocking openings in the screen by paint or plastics, as in the formation of the fabric of Fig. 6. Above a certain weight of fibres deposited per unit area the fabric has a top layer of randomly orientated fibres. Bonding.-In the examples the fibres are a mixture of rayon fibres and vinyl acetate/vinyl chloride copolymer fibres. The fabric is autogeneously bonded by heater 25. |
