Absorbent sheet made by creping a nascent web on a multilayer belt having openings

Patent metadata

Field	Value
Publication number	US-10731301-B2
Application number	US-201816189694-A
Country	US
Kind code	B2
Filing date	Nov 13, 2018
Priority date	Sep 25, 2014
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

An absorbent sheet made by a process that includes the steps of forming a nascent web from an aqueous papermaking furnish, and creping the nascent web on a multilayer belt that includes (i) a first layer made from a polymeric material having a plurality of openings, and (ii) a second layer attached to the first layer, with the nascent web being deposited onto a surface of the first layer. The absorbent sheet includes a plurality of hollow domed regions projecting from a side of the absorbent sheet, with each of the hollow domed regions being shaped such that a distance from at least one first point on an edge of a hollow domed region to a second point on an edge at an opposite side of the hollow domed region is at least about 0.5 mm.

First claim

We claim:

1. An absorbent sheet made by a process comprising the steps of:
forming a nascent web from an aqueous papermaking furnish; and
creping the nascent web on a multilayer belt that includes (i) a first layer made from a polymeric material having a plurality of openings, and (ii) a second layer that is separate from and attached to a surface of the first layer, with the nascent web being deposited onto the first layer,
wherein the absorbent sheet includes (a) a plurality of hollow domed regions projecting from a side of the absorbent sheet, with each of the hollow domed regions being shaped such that a distance from at least one first point on an edge of a hollow domed region to a second point on an edge at an opposite side of the hollow domed region is at least about 0.5 mm, and (b) connecting regions forming a network interconnecting the hollow domed regions of the absorbent sheet,
wherein a fiber density on a leading side in a machine direction (MD) of each of the hollow domed regions is less than a fiber density on a trailing side in the MD direction of each of the hollow domed regions, and
wherein a single ply of the absorbent sheet has a caliper of at least about 140 mils/8 sheets.

2. The absorbent sheet according to claim 1 , wherein the process further comprises a step of applying a vacuum to the multilayer belt such that the nascent web is drawn into the plurality of openings.

3. The absorbent sheet according to claim 2 , wherein the process further comprises a step of applying a vacuum as the nascent web is being deposited on the multilayer belt, in addition to the vacuum that draws the nascent web into the plurality of openings.

4. The absorbent sheet according to claim 1 , wherein the nascent web is deposited on the multilayer belt at about 30% to about 60% solids content.

5. The absorbent sheet according to claim 1 , wherein the nascent web is deposited on the multilayer belt at about 15% to about 25% solids content.

6. The absorbent sheet according to claim 1 , wherein the distance from the at least one first point on the edge of each of the hollow domed regions to the second point on the edge on the opposite side of each of the hollow domed regions is about 1.0 mm to about 4.0 mm.

7. The absorbent sheet according to claim 1 , wherein the distance from the at least one first point on the edge of each of the hollow domed regions to the second point on the edge on the opposite side of each of the hollow domed regions is about 1.5 mm to about 3.0 mm.

8. An absorbent sheet made by a process comprising the steps of:
forming a nascent web from an aqueous papermaking furnish; and
creping the nascent web on a multilayer belt that includes (i) a first layer made from a polymeric material having a plurality of openings, and (ii) a second layer that is separate from and attached to a surface of the first layer, with the nascent web being deposited onto the first layer,
wherein the absorbent sheet includes (a) a plurality of hollow domed regions, and (b) connecting regions forming a network interconnecting the hollow domed regions of the absorbent sheet,
wherein a fiber density on a leading side in a machine direction (MD) of each of the hollow domed regions is less than a fiber density on a trailing side in the MD direction of each of the hollow domed regions,
wherein a single ply of the absorbent sheet has a caliper of at least about 145 mils/8 sheets, and
wherein the absorbent sheet has a geometric mean (GM) tensile strength of less than about 3500 g/3 in.

9. The absorbent sheet according to claim 8 , wherein a multi-ply of the absorbent sheet has a caliper of at least about 245 mils/8 sheets, and the absorbent sheet has a GM tensile strength of less than about 3100 g/3 in.

10. The absorbent sheet according to claim 8 , wherein the plurality of hollow domed regions project from a side of the absorbent sheet, and
wherein a local basis weight in a connecting region adjacent to a first point on an edge of each of the hollow domed regions is greater than a local basis weight in a connecting region adjacent to a second point on an edge at an opposite side of each of the hollow domed regions.

11. The absorbent sheet according to claim 8 , wherein the process further comprises a step of applying a vacuum to the multilayer belt such that the nascent web is drawn into the plurality of openings.

12. The absorbent sheet according to claim 11 , wherein the process further comprises a step of applying a vacuum as the nascent web is being deposited on the multilayer belt, in addition to the vacuum that draws the nascent web into the plurality of openings.

13. The absorbent sheet according to claim 8 , wherein the nascent web is deposited on the multilayer belt at about 30% to about 60% solids content.

14. The absorbent sheet according to claim 8 , wherein the nascent web is deposited on the multilayer belt at about 15% to about 25% solids content.

15. An absorbent sheet made by a process comprising the steps of:
forming a nascent web from an aqueous papermaking furnish; and
creping the nascent web on a multilayer belt that includes (i) a first layer made from a polymeric material having a plurality of openings, and (ii) a second layer that is separate from and attached to a surface of the first layer, with the nascent web being deposited onto the first layer,
wherein the absorbent sheet includes (a) a plurality of hollow domed regions, and (b) connecting regions forming a network interconnecting the hollow domed regions of the absorbent sheet, and
wherein a fiber density on a leading side in a machine direction (MD) of each of the hollow domed regions is at least about 70% less than a fiber density on a trailing side in the MD direction of each of the hollow domed regions.

16. The absorbent sheet according to claim 15 , wherein the fiber density on the leading side in the MD of the hollow domed regions is about 75% less than the fiber density on the trailing side in the MD of the hollow domed regions.

17. The absorbent sheet according to claim 15 , wherein the process further comprises a step of applying a vacuum to the multilayer belt such that the nascent web is drawn into the plurality of openings.

18. The absorbent sheet according to claim 17 , wherein the process further comprises a step of applying a vacuum as the nascent web is being deposited on the multilayer belt, in addition to the vacuum that draws the nascent web into the plurality of openings.

19. The absorbent sheet according to claim 15 , wherein the nascent web is deposited on the multilayer belt at about 30% to about 60% solids content.

20. The absorbent sheet according to claim 15 , wherein the nascent web is deposited on the multilayer belt at about 15% to about 25% solids content.

Assignees

• Gpcp Ip Holdings Llc

Inventors

• Sze Daniel H
• Chou Hung Liang
• Fan Xiaolin

Classifications

• D21H27/40 Primary

  at least one of the sheets being non-planar, e.g. crêped (crêping or corrugating paper B31F) · CPC title

• D21H27/007

  relating to absorbency, e.g. amount or rate of water absorption, optionally in combination with other parameters relating to physical or mechanical properties · CPC title

• D21H27/005

  relating to physical or mechanical properties, e.g. tensile strength, stretch, softness · CPC title

• D21H27/002

  Tissue paper; Absorbent paper (D21H21/22, D21H27/02, D21H27/20 take precedence; toilet paper A47K10/00; absorbent pads for physiological fluids A61L15/16; making on paper-making machines D21F11/00) · CPC title

• D21H11/04

  Kraft or sulfate pulp · CPC title