US 12,252,823 B2
Composite nonwoven sheet material
Maria Bogren, Gothenburg (SE); and Hannu Ahoniemi, Gothenburg (SE)
Assigned to ESSITY HYGIENE AND HEALTH AKTIEBOLAG, Gothenburg (SE)
Filed by Essity Hygiene and Health Aktiebolag, Gothenburg (SE)
Filed on Nov. 30, 2023, as Appl. No. 18/525,015.
Application 18/525,015 is a division of application No. 16/965,088, granted, now 12,043,022, previously published as PCT/EP2018/052602, filed on Feb. 2, 2018.
Prior Publication US 2024/0116267 A1, Apr. 11, 2024
Int. Cl. D04H 1/4374 (2012.01); B08B 1/14 (2024.01); B32B 5/02 (2006.01); B32B 5/06 (2006.01); B32B 5/26 (2006.01); B32B 7/09 (2019.01); D04H 1/26 (2012.01); D04H 1/425 (2012.01); D04H 1/4291 (2012.01); D04H 1/4334 (2012.01); D04H 1/435 (2012.01); D04H 1/4382 (2012.01); D04H 1/492 (2012.01); D04H 1/498 (2012.01)
CPC D04H 1/492 (2013.01) [B08B 1/143 (2024.01); B32B 5/022 (2013.01); B32B 5/067 (2021.05); B32B 5/26 (2013.01); B32B 7/09 (2019.01); D04H 1/26 (2013.01); D04H 1/425 (2013.01); D04H 1/4291 (2013.01); D04H 1/4334 (2013.01); D04H 1/435 (2013.01); D04H 1/4374 (2013.01); D04H 1/43825 (2020.05); D04H 1/43835 (2020.05); D04H 1/43838 (2020.05); D04H 1/498 (2013.01); B32B 2262/0253 (2013.01); B32B 2262/0261 (2013.01); B32B 2262/0284 (2013.01); B32B 2262/062 (2013.01); B32B 2432/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A process of producing a composite nonwoven sheet material, comprising:
forming a fibrous web comprising a layer of reinforcement material having a first side and a second side, the reinforcement material being interposed between pulp fibers applied on the first side of the reinforcement material and microfibers applied on the second side of the reinforcement material; and
hydroentangling the fibrous web to form the composite nonwoven sheet material,
wherein the pulp fibers form a pulp-enriched first outer layer including at least 50 wt. % of pulp fibers in an outermost 5% of a thickness of the sheet material,
wherein the microfibers form a microfiber-enriched second outer layer including at least 60 wt. % of microfibers in an outermost 5% of a thickness of the sheet material, and
wherein the reinforcement material comprises spun-laid filaments,
wherein the pulp fibers and the microfibers penetrate the reinforcement material,
wherein the composite nonwoven sheet material has bulk pores having a maximum pore volume distribution at a pore radius between 5 and 30 μm and which has surface pores having a maximum pore volume distribution at a pore radius between 25 and 40 μm, and
wherein the composite nonwoven sheet material has a liquid absorbance capacity ranging between 5.5 and 8 grams of liquid per gram of composite nonwoven sheet material.