Method and apparatus for making microbubbled and/or microapertured polymeric webs using hydraulic pressure
US4772444A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1987 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Aug 24, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2059/023
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method for hydraulically deforming a web of polymeric film while the film is supported on a moving forming structure to produce a novel microbubbled substantially fluid-impervious web exhibiting substantially the same consumer preferred soft and silky tactile impression and reduced noise generation levels heretofore only achievable in microapertured, and hence substantially fluid pervious polymeric webs. In a particularly preferred embodiment, the microbubbled polymeric web exhibits a fine-scale pattern of discrete mushroom shaped surface aberrations, each of said surface aberrations having its amplitude oriented substantially perpendicular to the surface in which the surface aberration originates. The method may also be utilized to produce fluid pervious microapertured webs which are known in the art. Apparatus for producing microbubbled and/or microapertured webs either in "planar" or "macroscopically expanded" form are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.