| 摘要 |
<p>To produce a non woven fabric (V), the carded fibers are deposited on to a permeable conveyor belt (7a) by an air flow after they have been aligned (5). The fiber material is passed through a carding process (4) using a carding drum (4h) with a number of peripheral units (4e,4f) to separate and align the fibers in parallel. On leaving the carding drum (4h), the fibers are taken by the leading doffer cylinder (5a) at the carding drum (4h) surface with a rotation significantly slower then the carding drum, and in the opposite direction. The doffer cylinder has a clothing with the points aligned to the rear, against its direction of rotation. An Independent claim is included for an assembly with a carding stage (4), a conveyor (7a) at the air flow station (8), and a system to guide the air flow to project the carded fibers on to the conveyor. The fiber alignment station (5) gives a constant fiber flow to a final rotating cylinder (6) for delivery into the air stream. Preferred Features: The fiber alignment station (5) takes the fibers from the carding drum (4h) to gather them into a condensed web. The fiber alignment station (5) has at least a leading doffer cylinder (5a), and a second condensing cylinder (5b) at the circumference of the doffer (5a), rotating at a slower speed than the doffer and in the opposite direction and with a clothing where the points are aligned to the rear against its direction of rotation. Or the condensing cylinder (5b) rotates in the same direction as the doffer (5a), with a clothing where the points are aligned forwards against its direction of rotation. The delivery cylinder (6) is at the circumference of the condensing cylinder (5b), rotating at a higher or the same speed and in the same direction. Its clothing has points aligned forwards, in the direction of rotation. Or the delivery cylinder rotates at a high speed, and against the rotation of the condensing cylinder (5b), with clothing points aligned forwards in its direction of rotation. The assembly can have two fiber alignment stations (5), in parallel. With a single delivery cylinder (6), the second condensing cylinder (5b) is at its circumference. The air flow from the pneumatic unit (8) is directed towards the carding drum (4h) to assist in detaching the fibers from it. The delivery cylinder (6) has a rotary speed which is sufficient to detach the fibers from its surface by centrifugal forces.</p> |
