Process for making gypsum board having improved through-penetration strength
US6475313B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Sep 20, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB28B19/0092
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a process for making gypsum board comprising feeding a paper backing sheet and a fiberglass or plastic woven or non-woven scrim material in alignment to a board forming station, separating the paper and the scrim, feeding a high density calcium sulfate hemihydrate slurry into the trough formed between the paper and the scrim, and subsequently compressing the paper and the scrim into contact whereby the high density slurry is forced through the scrim, completely encapsulating the scrim in the high density slurry. As a result of this unique process, excellent bond is developed between the paper, the high density gypsum layer and the foamed gypsum core. The gypsum board has improved through-penetration strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.