公开(公告)号：US20210331978A1

公开(公告)日：2021-10-28

申请号：US17210789

申请日：2021-03-24

Applicant: UNITED STATES GYPSUM COMPANY

Inventor： Rudy A. Schermann ,  Annamaria Vilinska ,  Alfred Li ,  Blair C. Walker ,  Te Hua Lau ,  Stephen P. Erickson ,  Jose Luis Carrazco ,  Angel Arturo Rueda

IPC: C04B28/14 ,  C04B38/10 ,  C04B24/42 ,  C04B11/00 ,  C04B18/16 ,  C04B111/00

Abstract: A method for making a gypsum board including: combining a first plurality of particles including at least about 50 wt. % calcium sulfate dihydrate and about 0.05 wt. % to about 10 wt. % hydrophobic material and having a D50 particle size of about 200 μm to about 800 μm with a second plurality of particles including calcium sulfate hemihydrate to form a combined mixture of calcium sulfate; adding water to the combined mixture of calcium sulfate to make an aqueous gypsum slurry; depositing a core layer including the aqueous gypsum slurry over a forming surface; and allowing the core layer to set, thereby forming a set gypsum core.

公开(公告)号：US20250136504A1

公开(公告)日：2025-05-01

申请号：US18496687

申请日：2023-10-27

Applicant: United States Gypsum Company

Inventor： Blair C. Walker

IPC: C04B11/036 ,  C04B11/028 ,  F27D3/00 ,  F27D19/00

Abstract: Embodiments of a system and a method for manufacturing calcined gypsum can include a calcination unit having a heating unit with at least one variable heater and a calciner temperature control device having a temperature sensor and a controller in operable arrangement with the temperature sensor and the heating unit. The calciner temperature control device is configured to adjust a thermal energy output rate of the heating unit based upon a comparison of the detected temperature and a target set point temperature so as to allow the supply of gypsum to be fed into the calcining chamber at a constant rate.