Apparatus for making fibrous webs
OwnerErnst Fehrerinventor
Life of this patent
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Abstract
A fibrous feed web is delivered by a feeder to tooth-carrying carding drums, which rotate at a surface velocity which causes the fibers to flow off under centrifugal force to fly onto a continuously moving, air-permeable collecting surface, which is subjected to suction. In order to make a uniform fibrous web with simple structural means even at a high throughput, the carding drums are closely spaced apart in the direction of movement of the collecting surface and each carding drum which succeeds another carding drum in the direction of movement of the collecting surface constitutes a working roller for such preceding carding drum.
Claims12
An apparatus for making a fibrous web, which comprises
- (a) a feeder for feeding fibers in the form of a fibrous web,
- (b) a plurality of successively arranged tooth-carrying carding drums rotatable about parallel axes in the same sense at a surface velocity sufficient to cause carded fibers to be thrown off each one of said drums by centrifugal force, a first one of said drums being arranged to receive the fibrous web from the feeder,
- (c) air-permeable means movable in a direction transverse to the drum axes and having a fiber-collecting surface facing the carding drums,
- (1) the carding drums being so closely spaced apart in said direction that each succeeding carding drum cooperates with a preceding one of the drums like a working roller,
- (d) discharge ducts in the spaces between the successive carding drums arranged to receive the fibers thrown off respective ones of the drums and to deliver respective streams of said fibers to the fiber-collecting surface at successive locations spaced in said direction whereby the fibers are collected as a fibrous web on the fiber-collecting surface,
- (e) means for supplying a stream of air into each one of the discharge ducts to move the streams of fibers to the fiber-collecting surface, and
- (f) suction means for sucking the air through the air-permeable means to retain the fibers of the fibrous web on the collecting surface.
Dependencies are inferred from the claim text.