Process for developing porosity in air impervious film and articles produced by the process
US4547920A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1983 |
| Grant date | Oct 22, 1985 |
| Priority date | — |
| Expiry date | Oct 19, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S297/01
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A process for developing porosity in air impervious film. The process is disclosed for fabricating a cushion article having a cover provided with increased air flow capabilities. A covering is provided for a cushion body, the covering including a laminated film and, preferably, an outer fabric layer. The film includes a first layer having a relatively high temperature melting point and a second layer having a relatively low temperature melting point. The first layer includes perforations, and the second layer is continuous and air impervious. The laminated film is heated at a temperature which approaches or is above the melting temperature of the second layer but below the melting temperature of the first layer to melt the second layer at least in areas coincident with the perforations in the first layer to form air flow passages through the film laminate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.