Nonwoven water-soluble composite structure
Provided herein are nonwoven composite articles including a first layer including a first nonwoven web including a first plurality of fibers having a first diameter, a second layer including a second nonwoven web including a second plurality of fibers having a second diameter, and a first interface including at least a portion of the first nonwoven web and at least a portion of the second nonwoven web, wherein the portion of the first nonwoven web and the portion of the second nonwoven web are fused, and wherein the second diameter is smaller than the first diameter and the first plurality of fibers, the second plurality of fibers, or both include a water-soluble polyvinyl alcohol fiber forming material. Also provided are flushable wipes and absorbent articles including nonwoven webs including fibers including a water-soluble polyvinyl alcohol fiber forming material.
1 . A liquid containing nonwoven article, comprising:
a core nonwoven web comprising a first plurality of fibers having a first diameter and comprising a first polyvinyl alcohol fiber forming material, wherein the core nonwoven web comprises a liquid, the liquid comprising an active agent; and
an outer nonwoven web comprising a second plurality of fibers having a second diameter and comprising a second polyvinyl alcohol fiber forming material,
wherein the core nonwoven web is enclosed by the outer nonwoven web, and
wherein the outer nonwoven web is sealed to enclose the core nonwoven web by solvent welding, and the solvent is selected from the group consisting of water, ethanol, methanol, DMSO, glycerin, and a combination thereof,
wherein the core nonwoven web is saturated with the liquid, and
wherein the second diameter is smaller than the first diameter.
2 . The liquid containing nonwoven article of claim 1 , wherein the outer nonwoven web is wrapped around the first nonwoven web.
3 . The liquid containing nonwoven article of claim 1 , wherein the outer nonwoven web has a form of a sleeve or an envelope and the core nonwoven web is provided in the sleeve or the envelope.
4 . The liquid containing nonwoven article of claim 1 , wherein the core nonwoven web has a first length in a first direction and the outer nonwoven web has a second length equal to the first length in the first dimension.
5 . The liquid containing nonwoven article of claim 1 , wherein a weight of the core nonwoven web comprising the liquid is two times to ten times of a weight of the core nonwoven web prior to addition of the liquid comprising the active agent.
6 . The liquid containing nonwoven article of claim 1 , wherein the core nonwoven web comprises about 5 grams (g) to about 30 g of liquid.
7 . The liquid containing nonwoven article of claim 1 , wherein the core nonwoven web comprising the liquid has a basis weight of about 30 gsm to about 2000 gsm.
8 . The liquid containing nonwoven article of claim 1 , wherein the core nonwoven web has a dry basis weight of about 15 gsm to about 200 gsm.
9 . The liquid containing nonwoven article of claim 1 , wherein the outer nonwoven web has a basis weight of about 15 gsm to about 400 gsm.
10 . The liquid containing nonwoven article of claim 1 , wherein the outer nonwoven web has a thickness of about 0.5 millimeters (mm) to about 6.0 mm.
11 . The liquid containing nonwoven article of claim 1 , wherein the core nonwoven web is a single ply or is comprised of multiple layers of nonwoven web.
12 . The liquid containing nonwoven article of claim 1 , wherein at least a portion of the core nonwoven web is in contact with at least a portion of the outer nonwoven web.
13 . The liquid containing nonwoven article of claim 1 , wherein the liquid containing nonwoven article has a plurality of edges and the core nonwoven web and the outer nonwoven web are sealed on at least two edges of the plurality of edges.
14 . The liquid containing nonwoven article of claim 1 , further comprising at least one of a plurality of markings or a pattern on the outer nonwoven web.
15 . The liquid containing nonwoven article of claim 1 , wherein the nonwoven article has a shape selected from the group consisting of a quadrilateral, a triangle, a circle, a star, a heart, an octagon, a pentagon, a hexagon, a heptagon, an oval, a crescent, a semicircle, a cross, a trefoil, a quadrafoil, a droplet, a pentagram, a hexagram, an octagram, a crown, a snowflake, a shield, a cloud, an arrow, and a combination of the foregoing.
16 . The liquid containing nonwoven article of claim 1 , wherein the liquid containing nonwoven article has a thickness of about 2 mm to about 50 mm.
17 . The liquid containing nonwoven article of claim 1 , wherein a maximum length in a dimension is about 7 inches (17.78 cm).
18 . The liquid containing nonwoven article of claim 1 , wherein a maximum length in a dimension is at least about 0.5 inches (1.27 cm).
19 . The liquid containing nonwoven article of claim 1 , wherein each of the first polyvinyl alcohol fiber forming material and the second polyvinyl alcohol fiber forming material are independently selected from a polyvinyl alcohol homopolymer, a polyvinyl alcohol copolymer, and a combination of the foregoing.
20 . The liquid containing nonwoven article of claim 19 , wherein the polyvinyl alcohol copolymer comprises an anionic modified polyvinyl alcohol.
21 . The liquid containing nonwoven article of claim 20 , wherein the anionic modified polyvinyl alcohol comprises an (alkyl) acrylate modified polyvinyl alcohol, a maleate modified polyvinyl alcohol, a sulfonate modified polyvinyl alcohol, or a combination thereof.
22 . The liquid containing nonwoven article of claim 1 , wherein the first plurality of fibers or the second plurality of fibers further comprises one or more fiber forming materials selected from the group of a polyacrylate, a polyvinyl pyrrolidone, a polyethyleneimine, guar gum, gum acacia, xanthan gum, carrageenan, a water-soluble starch, a water-soluble cellulose, a cellulose ether, a cellulose ester, and a cellulose amide.
23 . The liquid containing nonwoven article of claim 1 , wherein the first polyvinyl alcohol fiber forming material comprises a polyvinyl alcohol homopolymer.
24 . The liquid containing nonwoven article of claim 1 , wherein the second polyvinyl alcohol fiber forming material comprises a polyvinyl alcohol homopolymer.
25 . The liquid containing nonwoven article of claim 1 , wherein the first polyvinyl alcohol fiber forming material and the second polyvinyl alcohol fiber forming material are the same.
26 . The liquid containing nonwoven article of claim 1 , wherein the first polyvinyl alcohol fiber forming material and the second polyvinyl alcohol fiber forming material have a difference in a viscosity, a degree of hydrolysis, a degree of copolymerization, or a combination thereof.
27 . The liquid containing nonwoven article of claim 1 , wherein the active agent comprises one or more selected from the group of an enzyme, an oil, a flavor, a colorant, an odor absorber, a fragrance, a pesticide, a fertilizer, an oxidant, an activator, an acid catalyst, a metal catalyst, an ion scavenger, a detergent, a disinfectant, a surfactant, a bleach, a bleach component, and a fabric softener.