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.