Patent ID: 8056369

Claim:
A device that is used in the formation of fibrous felts, fibers of the fibrous felts including a material that is attenuable by internal centrifugation and by an attenuation device via a gas stream, a flow of the fibers being in the form of a tubular veil, the device comprising: an air blower located beneath the attenuation device, the air blower expelling air tangentially to the tubular veil to impress a rotational movement on the veil and supplying air in a direction perpendicular to a main direction of the flow of the tubular veil, wherein a velocity of the air supplied in the direction perpendicular to the main direction of the flow has a single component, the air blower including an annular chamber including an external wall and a partially open internal wall disposed radially inward of the external wall and that surrounds the tubular veil, the external wall including at least one air intake and the partially open internal wall including partial blocking fins.