Extrusion coated perforated nonwoven web and method for making
US10821622B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 2017 |
| Grant date | Nov 3, 2020 |
| Priority date | — |
| Expiry date | Jun 8, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24331
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for making an extrusion coated perforated nonwoven web. The method comprises the steps of extruding a molten polyethylene coating onto a nonwoven web, and aperturing the molten polyethylene coating through heat and pneumatic pressure differential to create microperforations therein at a density of between about 35 and about 120 perforations per linear inch. The resulting microperforated nonwoven web is then thermomechanically perforated by feeding it through perforating rolls, at least one of which has raised protuberances to create macroperforations that extend through at least the polyethylene coating. The macroperforations have a density of between about 6 and about 35 perforations per linear inch. The perforated nonwoven web is useful as a topsheet for absorbent articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.