Thermally conductive joining film
US5695847A · kind A · utility
Inventor
Key dates
| Filing date | Jul 10, 1996 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Jul 10, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2958
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A thermally conductive film that includes a film of polymeric matrix material having a thickness t defined between a top surface and a bottom surface. A plurality of fibers, having a greater thermal conductivity than the polymeric matrix material, is disposed in the film and extends between the top surface and the bottom surface. Each of the fibers are oriented in the film to form a fiber-to-film surface angle .theta. relative to the top and bottom surfaces that is greater than about 45.degree. but is less than arctan t/d, where t is the thickness of the film and d is the diameter of the fibers in the direction of the angle .theta.. A shear/extruder apparatus is used to form the thermally conductive film from a sheet of composite prepreg material. An upper die block and a lower die block separated by a predetermined distance form an extrusion slot therebetween. A ram blade is dimensioned to intermittently insert into the input opening of the extrusion slot so that when the prepreg is positioned in front of the input opening, the prepreg is repetitively sheared by the ram blade to form sheared pieces that are forced into the extrusion slot and merged together to form the thermally c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.