Nonwoven fabrics containing yarns with varying filament characteristics
View Patent ↗The subject invention provides non-woven fabrics having yarns of varying characteristics. In a preferred embodiment the subject invention provides nonwoven fabrics that comprise yarns of different deniers or cross sections. The use of these yarns gives the nonwoven fabric a unique appearance and advantageous properties. The subject invention further pertains to the processes used to produce these fabrics.
1. A method for producing a nonwoven fabric wherein said method comprises providing a web comprising a plurality of filaments and having inserted into said web a yarn, wherein the fabric is formed by depositing the yarn and filaments onto a forming table and subsequently subjecting said web of inserted yarn and filaments to a chemical, thermal, or ultrasonic bonding system, wherein the said inserted yarn is made of polyester, polyamide, polyimide, polypropylene, polyethylene, polystyrene, polytetrafluroethylene, fiberglass, polytrimethylene, polylactic acid, polycarbonate, polyester terephthalate, or polybutylene terephthalate, or blends or copolymers thereof, and wherein said inserted yarn is at least 1.5 times as long as the linear length of said fabric.
2. The method of claim 1 , wherein at least one yarn is inserted per eighteen centimeters of fabric width.
3. The method of claim 1 , wherein the denier per filament of the inserted yarn is at least 1.
4. The method of claim 1 , wherein the inserted yarn is pigmented or dyed.
5. The method of claim 1 , wherein the yarn inserted into the fabric is a monofilament, multifilament or cabled yarn or a combination thereof.
6. The method of claim 1 , wherein the yarn inserted into the fabric comprises conjugate or bicomponent filaments or multicomponent filaments.
7. The method of claim 1 , wherein the inserted yarn has different dye properties than the filaments of the fabric that said yarn is inserted into.
8. The method of claim 1 , wherein the cross section of filaments of the inserted yarn are round, trilobal, multilobal crescent, cross or X, E or oval shaped.
9. The method of claim 1 , where the cross section of filaments of the inserted yarn contain voids or are hollow filaments.
10. The method of claim 1 , wherein said nonwoven fabric is made by a spunbond process.
11. The method of claim 1 , wherein said nonwoven fabric is made by a needle punch process.
12. The method of claim 1 , wherein said nonwoven fabric is made by a carding process.
13. The method of claim 1 , wherein said nonwoven fabric is made by a wet laid or dry laid process.
14. The method of claim 1 , wherein said nonwoven fabric is made by a hydroentangling process.
15. The method of claim 1 , wherein yarns are inserted into, on or under said fabric using a method selected from the group consisting of attenuation jets, slot attenuation devices, mechanical feed devices and free falling.
16. The method according to claim 15 , wherein yarns are inserted into, on or under said fabric using a slot attenuation device.
17. The method according to claim 15 , wherein yarns are inserted into, on or under said fabric using mechanical feed devices or rollers.
18. The method according to claim 15 , wherein yarns are inserted into, on or under said fabric by allowing said yarns to fall freely below, into or on said fabric.
19. The method according to claim 1 , wherein the thread line denier of said inserted yarn is at least twice the denier per filament of the fabric.
20. The method according to claim 1 , wherein said nonwoven fabric has a basis weight between about 7 grams per square meter and about 250 grams per square meter.