公开(公告)号：US20230406781A1

公开(公告)日：2023-12-21

申请号：US18295516

申请日：2023-04-04

Applicant: UNITED STATES GYPSUM COMPANY

Inventor： Annamaria VILINSKA ,  Mark HEMPHILL ,  Naser ALDABAIBEH ,  Mark ANTOSH

IPC: C04B40/00 ,  C04B11/00

CPC classification number: C04B40/0028 ,  C04B11/00 ,  C04B2111/0062

Abstract: A process is provided for creating a gypsum wallboard slurry with enhanced strength. The process includes providing a gypsum wallboard slurry mixer, providing suitable amounts of calcined gypsum and water in the mixer to create a slurry, agitating the slurry in the mixer, extracting a portion of the slurry in the mixer, reintroducing the extracted portion into the mixer for further mixing, and dispensing the mixed slurry from an outlet of the mixer.

公开(公告)号：US20230150879A1

公开(公告)日：2023-05-18

申请号：US17851709

申请日：2022-06-28

Applicant: UNITED STATES GYPSUM COMPANY

Inventor： Qinghua LI ,  Mark HEMPHILL

IPC: C04B28/14 ,  C04B22/00 ,  C04B22/10 ,  C04B22/16 ,  B32B29/00 ,  B32B5/24 ,  B32B5/02 ,  B32B7/02 ,  B32B37/15 ,  B32B38/00 ,  B32B5/18 ,  B32B13/04 ,  B28B19/00

CPC classification number: C04B28/14 ,  B28B19/0092 ,  B32B5/18 ,  B32B5/022 ,  B32B5/245 ,  B32B7/02 ,  B32B13/045 ,  B32B29/007 ,  B32B37/15 ,  B32B38/0004 ,  B32B38/164 ,  C04B22/10 ,  C04B22/16 ,  C04B22/0093 ,  C04B2103/0078

Abstract: A gypsum wallboard having a core with a central core layer and one or more densified layers is disclosed. At least one densified layer contains salt absorbent particles of zeolite and/or hydrotalcite to improve adhesion of the gypsum core to a cover sheet. Also, methods of making the gypsum wallboard and a wall system for employing the gypsum wallboard are disclosed.

公开(公告)号：US20200055277A1

公开(公告)日：2020-02-20

申请号：US16401675

申请日：2019-05-02

Applicant: UNITED STATES GYPSUM COMPANY

Inventor： Mark HEMPHILL ,  Qinghua LI ,  Charles W. COCHRAN

IPC: B32B13/08 ,  B32B29/06 ,  B32B29/00 ,  B32B3/26 ,  C04B28/14

Abstract: 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.

公开(公告)号：US20210155543A1

公开(公告)日：2021-05-27

申请号：US17025003

申请日：2020-09-18

Applicant: United States Gypsum Company

Inventor： Yijun SANG ,  Mark HEMPHILL

IPC: C04B24/38 ,  C04B28/14

Abstract: Disclosed is an acid-modified flour and a method of making the acid-modified flour. The acid-modified flour is desirably prepared using a dry milling process. A starting flour is combined with a strong acid to form a mixture. The mixture is heated. A neutralizer is added to increase the pH of the mixture. If desired, the mixture can be dried and any agglomerates can be removed. The acid-modified flour can be used as a binder in a slurry for preparing one or more gypsum layers in a gypsum board.

公开(公告)号：US20200055278A1

公开(公告)日：2020-02-20

申请号：US16401719

申请日：2019-05-02

Applicant: UNITED STATES GYPSUM COMPANY

Inventor： Qinghua LI ,  Runhai LU ,  Charles W. COCHRAN ,  Mark HEMPHILL

IPC: B32B13/08 ,  B32B29/06 ,  B32B29/00 ,  B32B3/26 ,  C04B28/14

Abstract: Gypsum boards formed from synthetic gypsum and other gypsum sources having high chloride salt concentrations. Gypsum boards may include a board core including set gypsum. A total concentration of the chloride anion in the board core ranges from about 500 ppm to about 3000 ppm, typically about 1000 ppm to about 3000 ppm, based on weight of the calcium sulfate hemihydrate. An inner surface of a front paper cover sheet contacts a first face of the board core. An inner surface of a back paper cover sheet contacts a second face of the board core. A starch layer coats the inner surface of at least one of the front and back cover sheet. Methods of making the gypsum board, and a wall system for employing the gypsum boards, are also provided.