- 专利标题: GYPSUM BOARD FROM GYPSUM HAVING HIGH LEVEL OF CHLORIDE SALT AND A PERFORATED SHEET AND METHODS ASSOCIATED THEREWITH
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申请号: US16401675申请日: 2019-05-02
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公开(公告)号: US20200055277A1公开(公告)日: 2020-02-20
- 发明人: Mark HEMPHILL , Qinghua LI , Charles W. COCHRAN
- 申请人: UNITED STATES GYPSUM COMPANY
- 申请人地址: US IL CHICAGO
- 专利权人: UNITED STATES GYPSUM COMPANY
- 当前专利权人: UNITED STATES GYPSUM COMPANY
- 当前专利权人地址: US IL CHICAGO
- 主分类号: B32B13/08
- IPC分类号: B32B13/08 ; B32B29/06 ; B32B29/00 ; B32B3/26 ; C04B28/14
摘要:
Gypsum boards formed from synthetic gypsum and other gypsum sources having high chloride salt concentrations. The gypsum boards may include a set gypsum board core layer between a front and back paper cover sheets. The back paper cover sheet has a plurality of perforations extending therethrough. Methods of making the gypsum boards, and a wall system for employing the gypsum boards, are also provided. The concentration of the chloride anion in aqueous gypsum slurry used to make the set gypsum board core layer and to perform the methods of the invention may range from about 500 ppm to about 3000 ppm, typically from about 500 ppm to about 2000 ppm per 1,000,000 parts by weight calcium sulfate hemihydrate, more typically from about 500 ppm to about 1500 ppm per 1,000,000 parts by weight calcium sulfate hemihydrate.