Apparatus for stabilizing plaster
US7748888B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 2008 |
| Grant date | Jul 6, 2010 |
| Priority date | — |
| Expiry date | Apr 23, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01F2035/99
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for stabilizing plaster includes: a) providing a heated HH-plaster; b) feeding the hot plaster in a moistening device having walls heated to at least 100° C.; c) injecting water and/or steam into the moistening device in conditions that such not yet moistened surfaces of the plaster are exposed to the injected water and/or steam; d) maintaining an atmosphere in the moistening device at a level of the dew point in the range of 75 to 99° C.; e) feeding the moistened blend into a curing device; f) maintaining an atmosphere in the curing device above 75° C. for at least 3 minutes; g) feeding the moistened and cured blend into a drying device; and h) drying the moistened and cured blend.Also an apparatus for moistening β-hemihydrate plaster includes a rotating drum with lifting blades inside where all walls in contact with the product are externally heated at a temperature above 100° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.