Shell forming system
US4643854A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1984 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Aug 15, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2009/088
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An apparatus is provided for forming gas-filled spheres of metal, glass or other material, which produces spheres (12) of uniform size and wall thickness in a relatively simple system. The system includes concentric nozzles, including an inner nozzle (18) through which gas flows and and an outer nozzle (20), which jointly define an annular passageway (50) through which a liquid flows. The flow rates are adjusted so that the gas flows at greater velocity than does the liquid, out of their respective nozzles, e.g. three times as great, in order to produce an extrusion (30) which undergoes axisymmetric oscillations resulting in the pinch off into hollow spheres with very uniform spacing. The system is useful not only where gas-filled spheres are required, but also is useful to accurately control the dispensing of solid, liquid, or gaseous materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.