Methods for impregnating polymer beads
US6020388A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1997 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Mar 4, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C44/3461
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Methods for impregnating polymer beads comprise providing polymer beads in an impregnation chamber at a temperature from about 150.degree. F. to about 200.degree. F. and a pressure of from about 25 psig to about 100 psig, and simultaneously fluidising the polymer beads in the impregnation chamber with an impregnating gas. The gas is delivered to the chamber at a rate sufficient to cause individual polymer beads to be fluidised and for a time sufficient to impregnate the gas in the polymer beads. The apparatus adapted for such methods includes a heater, a compressor and a plurality of vents for supplying a gas to the impregnating chamber to fluidise polymer beads contained therein simultaneously with the heating and pressurising of the beads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.