Absorbent webs including highly textured surface
View Patent ↗The present invention discloses a paper web with a highly textured surface and a method of forming the highly textured web. The process includes printing a viscous material onto the surface of a paper web in a pattern with a low pressure printing process. Specifically, it has been discovered that certain low pressure printing technologies may be used to deliver a viscous material to the surface of a paper web such as a tissue, an air laid web, or a fibrous nonwoven web with good control of material delivery. At some point after the viscous material is applied to the web, the material may be fibrillated into a three-dimensional structure and then cured. In various embodiments, the viscous material may be fibrillated and cured so as to provide a good scrubbing surface to the web, provide an attachment structure on the web, or provide a good contact surface against a second substrate in forming laminate products.
1. A paper product comprising:
a paper web comprising papermaking fibers;
a viscous material printed in a heterogeneous pattern on a first side of the paper web, wherein the viscous material is fibrillated to form a three-dimensional structure comprising fibrils rising from the surface of the paper web, the printed pattern comprising at least two regions differing in the applied basis weight of viscous material; wherein the paper web is a tissue web having a bulk between about 3 to about 20 cubic centimeters/gram.
2. The paper product of claim 1 , wherein the paper web has a basis weight of between about 10 and about 200 grams per square meter.
3. The paper product of claim 1 , wherein the paper web has a basis weight of between about 30 and about 90 grams per square meter.
4. The paper product of claim 1 , wherein the at least two regions comprise a first region and a second region having a difference in mean fibril length of about 0.05 mm.
5. The paper product of claim 1 , wherein the paper web has a Frazier air permeability of greater than about 10 cubic feet/minute.
6. The paper product of claim 1 , wherein the paper web has a three-dimensional texture with a Surface Depth of about 0.2 mm or greater.
7. The paper product of claim 1 , wherein the cured viscous material covers between about 10% and 90% of the surface area of the paper web.
8. The paper product of claim 1 , wherein the viscous material is a hotmelt viscous material having a Brookfield viscosity at 20 rpm of about 20 poise or greater.
9. The paper product of claim 1 , wherein the viscous material is a hotmelt viscous material having a Brookfield viscosity at 20 rpm of about 50 poise or greater.
10. The paper product of claim 1 , wherein the viscous material is a hotmelt viscous material having a Brookfield viscosity at 20 rpm of about 500 poise or greater.
11. The paper product of claim 1 , wherein the viscous material is a hotmelt viscous material having a Brookfield viscosity at 20 rpm of about 1000 poise or greater.
12. The paper product of claim 1 , wherein the at least two regions comprise a first region and a second region having a difference in fibril density of about 100 fibrils per square centimeter or greater.
13. The paper product of claim 1 , wherein the pattern of the applied viscous material defines a continuous network of unprinted regions with islands of printed regions therebetween.
14. The paper product of claim 13 , wherein the fibrils extend from about 0.5 cm to about 1.5 cm above the surface of the paper web.
15. The paper product of claim 13 , wherein the fibrils have a cross sectional diameter of about 5 micrometers or greater.
16. The paper product of claim 1 , wherein the three-dimensional structure of the cured viscous material comprises an abrasive scrubbing pattern on the surface of the paper web.
17. The paper product of claim 1 , wherein the mean fibril length of at least one of the at least two regions is about 0.2 mm or greater.
18. The paper product of claim 1 , wherein two of the at least two regions comprise fibrils rising from the surface of the paper web, the fibrils having a density of at least about 100 fibrils per square centimeter in both regions.
19. The paper product of claim 1 , comprising a second viscous material is printed on the second side of the paper web in a second pattern.
20. The paper product of claim 19 , wherein the second viscous material printed on the second side of the paper web is fibrillated and cured to form a three-dimensional structure on the second side of the paper web.
21. The paper product of claim 19 , wherein the first and second viscous materials are the same.
22. The paper product of claim 19 , wherein the first and second viscous materials are different.
23. The paper product of claim 1 , wherein an additive is printed on a surface of the web.
24. The paper product of claim 1 , wherein the paper web is a stratified paper web.
25. The paper product of claim 1 , wherein the viscous material is a latex.