Method and apparatus for producing polyurethane foam
US6271275A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 17, 1998 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Aug 17, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01F2101/2805
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and apparatus are disclosed for producing polyurethane foam without the assistance of any through-flow mixing device for the precursor components. Air or other safe gas is mixed with a polyol-containing precursor to form a froth, and the froth is directed in a stream via a dispenser into a free space at a first predetermined rate of flow. Liquid isocyanate-containing precursor is directed in a stream via a dispenser at a second predetermined rate of flow into the free space so as to contact and mingle with the stream of froth. The mixed components then fall together into a container where they react to form polyurethane foam. Mixing of the streams is facilitated by a target upon which the two streams impinge in close proximity to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.