Apparatus and method for cross-directional stretching of polymeric film and other nonwoven sheet material and materials produced therefrom
US6368444B1 · kind B1 · utility
91Cited by
57References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1999 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Oct 27, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2555/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for stretching nonwoven sheet material in the cross-machine direction includes coursing a nonwoven sheet material through a deformable nip, the nip being formed between two rotating stretch surfaces having intermeshing peaks and troughs, the surfaces of the peaks and troughs being covered with a deformable material, and contemporaneously pressing the stretch surfaces together while rotating them, such that as the nonwoven material travels through the nip, the nip deforms from an initial flat formation into a convoluted formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.