Process and intermediate sheet for forming shaped interlayer blanks
US5087502A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1989 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Oct 12, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/3163
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for forming intermediate sheeting for forming shaped interlayer blanks comprising extruding plasticized polyvinyl butyral melt into an endless straight-sided sheet having a gradient color band extending along one side, the melt forming the region of the sheet laterally of the color band extruding at a greater thickness than that forming the portion containing the color band, thereby providing a wedge-shaped thickness profile in the sheet, quenching the extruded sheet to set the polymer and winding the sheet in roll form. The intermediate sheet is at least about twenty inches wide and the wedge-shaped cross section gradually increases from about 28 to 32 mils at one edge to about 33 to 40 mils at the other edge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.