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US 4,599,766 AGranted
Method and apparatus for forming a more even web from staple fibers
AssigneeHergeth Hollingsworth GmbH
InventorWalter Wirth
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AssigneeHergeth Hollingsworth GmbH
InventorWalter Wirth
Estimating the term…
In conjunction with a randomizing web former is disclosed means for regulating the pressures subsisting within the jamming slot of the randomizing web former formed between the arcuate toothed surface of a carded staple fiber bearing cylinder and a confining surface mounted adjacent thereto. The regulating means includes a housing one wall of which is perforate so as to provide gaseous intercommunication with the interior plenum thereof, in which resides a pressure sensing element interconnected with a control element such as a preprogrammed computer. The plenum intercommunicates with a pressure adjusting device, and the latter is operatively interconnected with the control element. Signal from the sensor reflecting the then pressure within the jamming slot when received by the control element is compared with a target or desired pressure; any difference calculated is transmitted in the form of a command signal to the pressure adjusting device which forces more air into the plenum and thus into the jamming slot in instances of sensed pressures below the target pressure, or removes air as by a vacuum from the plenum and thus reduces pressure in the jamming slot when the sensed pressure there is greater than the targetted pressure desired.
In a method for forming a random fibrous web from staple fibers, including disentangling the constitutent fibers of fibrous flock and forming a web thereof wherein said fibers are aligned substantially axially parallel one another through a carding action, and then randomizing the axial orientation of the fibers to provide a more isotropic web structure by means of centrifugal, aerodynamic web formation wherein carded fibers are moved through a zone in the form of a progressively narrowing slot about the arcuate surface of a toothed cylinder and then are propelled into free flight therefrom and onto the surface of a receiving means in a pattern of axial randomized orientation of the contituent fibers, the improvement comprising
In an apparatus for forming a random fibrous web from staple fibers, including means for forming a web from fibrous flock wherein said fibers are aligned substantially axially parallel one another through a carding action, and means for randomizing the axial orientation of said fibers to provide a more isotropic web structure by means of centrifugal , aerodynamic web formation wherein carded fibers are moved through a zone in the form of a progressively narrowing slot about the surface of a toothed cylinder and then are propelled into free flight therefrom and onto the surface of a receiving means in a pattern of axial randomized orientation of the constituent fibers, the improvement comprising
Apparatus for forming randomized webs from staple fibers, including carding means for disentangling the constituent fibers of fibrous flock and aligning the constituent fibers so that they are oriented substantially axially parallel one another, and randomizing web forming means including a toothed cylinder for bearing thereabout carded fibers, and fiber receiving means for receiving fibers from said toothed cylinder, and mounted intermediate thereto a web former, said web former including an enclosed housing forming a plenum, one wall of said housing positioned adjacent to a portion of said cylinder, of complementary arcuity thereto and spaced therefrom to form a slot passageway of narrowing width from entry upstream of the direction of cylinder rotation to exit downstream thereof measured from the toothed surface to the opposing surface of said housing wall, and another wall of said housing positioned adjacent said fiber receiving means, said one wall being formed with perforations therethrough, and pressure control means for controlling the pressure in the respective passageways between the respective walls and opposing surfaces of said cylinder and said fiber receiving means to a desired value.
Dependencies are inferred from the claim text.