Foamed gypsum wallboard
US4057443A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1976 |
| Grant date | Nov 8, 1977 |
| Priority date | — |
| Expiry date | Aug 20, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B13/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Lightweight gypsum wallboard produced by continuously combining a small amount of surface active agent with a liquid stream which stream is made up of substantially all of the liquids to be used in the manufacture of a continuous web of gypsum wallboard, subjecting this mixture to an intense agitation with vaned saw tooth-like rotary blades in a foam generator while adding a controlled quantity of air thereto, forming a uniformly dispersed foam of very small bubbles from the liquid by completely generating all of the surface active agent therein to form this foam, and mixing this foamed liquid with finely ground dry calcined gypsum in a suitable mixing device to form a foamed settable gypsum slurry, disposing the slurry between paper cover sheets, and forming a continuous web of gypsum wallboard.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.