Apparatus and methods of manufacturing fibrous nonwoven materials and products comprising the same
View Patent ↗In an exemplary embodiment, the disclosed drying and dewatering system comprises an air knife and a vacuum slot, wherein the air knife is positioned over the vacuum slot and fibrous nonwoven material is passed under the air knife and over the vacuum slot. The embodiments of the present disclosure may be used to achieve greater water removal and more uniform binding agent distribution across the nonwoven fibrous material.
1. A method for providing a non-woven fibrous material preparation apparatus, the method comprising:
forming a negative pressure at a first surface of a plate, wherein the plate has a slot spanning its thickness from the first surface to a second surface and the slot is in fluid communication with the negative pressure;
forming a positive pressure air flow at a distance from the second surface;
directing the positive pressure air flow towards the slot; and
contacting a fibrous nonwoven material with the positive pressure air flow.
2. The method according to claim 1 , wherein contacting a fibrous nonwoven material with the positive pressure air flow may comprise passing the fibrous nonwoven material between the positive pressure air flow and the second surface.
3. The method according to claim 2 , wherein passing the fibrous nonwoven material between the positive pressure air flow and the second surface may comprise contacting the fibrous nonwoven material with a movable forming wire and translating the wire relative to the second surface.
4. The method according to claim 1 , wherein the method further comprises detaching a cut fibrous nonwoven material from the wire.
5. The method according to claim 1 , wherein the positive pressure air flow is directed towards the slot at an angle substantially perpendicular to the second surface.
6. The method according to claim 1 , wherein forming a negative pressure at a first surface of a plate may further comprise maintaining a substantially constant negative pressure at a first surface of a plate.
7. The method according to claim 1 , wherein forming a positive pressure air flow may comprise emitting air at velocities of about 28 mph.
8. The method according to claim 1 , wherein the distance from the second surface is about 8 mm.
9. The method according to claim 1 , wherein a direction of the negative pressure and a direction of the positive pressure are co-linear.
10. A method for preparing a non-woven fibrous material, the method comprising:
providing a movable forming wire structure;
passing a fibrous material on the movable forming wire structure;
emitting air at the fibrous material using an air knife, wherein the air knife is disposed above the movable forming wire structure at a substantially perpendicular angle relative to a plane defined by the movable forming wire;
providing suction on the fibrous material using a vacuum device, wherein the vacuum device is operable to draw air through a slot defined in a surface of the vacuum device.
11. The method according to claim 10 , wherein the air knife is operable to emit air at velocities of about 28 mph.
12. The method according to claim 10 , wherein a gap between the air knife and the slot is about 8 mm.
13. The method according to claim 10 , further comprising distributing air flow through the air knife using a manifold.
14. The method according to claim 10 , further comprising promoting even distribution of air flow through the air knife using a compressor.
15. The method according to claim 10 , further comprising cutting off air flow to the air knife using a solenoid valve.
16. The method according to claim 10 , wherein an air flow direction provided by the air knife and a vacuum direction provided by the vacuum device are co-linear.
17. The method according to claim 10 , wherein the movable forming wire structure allows fluids to pass therethrough.
18. The method according to claim 10 , wherein the movable forming wire structure allows fluids to pass therethrough.
19. The method according to claim 10 , further comprising providing, using the air knife and the vacuum device, patterned distributions of moisture in the fibrous material.