| 摘要 |
<p>It is the purpose of the invention to indicate a former head (2) for dry forming fibrous tissue, where a fibre material mixed with air is introduced to at least one rotating drum (4) in a former head by injection, where the drum (4) is provided internally with means (6, 16, 18, 20) for fluidising the fibres injected. By the invention is achieved a higher production capacity and simultaneously an increased distribution quality of the fibres. Thus it is possible to have a former head (2) with high capacity and an increased width, preferably over four meters. The known problems with natural oscillations in the needle rollers are avoided in that they are substituted by so-called slotted air nozzles (6). The slotted air nozzles (6) extend along the drum (4) in the whole length and are provided with adjustable (20) nozzle lips (18) in order to regulate the amount of air and direction of the air flow blown through the perforations of the drum. Hereby is achieved the surprising effect that the capacity of the former head is markedly higher compared with the prior art, and that the distributing quality also is markedly better than by high-speed operation of traditional machines.</p> |
