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US 9,851,318 B2Granted
Method of detecting air gap in gypsum-based building board and method of manufacturing gypsum-based building board
AssigneeYoshino Gypsum Co., Ltd.
InventorsShinji Yonezawa, Yasutoshi Ueno
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Abstract
A method of detecting an air gap in a gypsum-based building board includes cooling a surface of a gypsum-based building board that has generated heat because of a hydration reaction of calcined gypsum by applying a cooling medium to the surface, and detecting a temperature distribution of the surface of the gypsum-based building board after completion of the cooling.
Claims3
A method of manufacturing a gypsum-based building board, comprising:
- forming the gypsum-based building board of a predetermined shape;
- cooling a surface of the gypsum-based building board that has generated heat because of a hydration reaction of calcined gypsum by applying a cooling medium to the surface;
- detecting a temperature distribution of the surface of the gypsum-based building board after completion of said cooling;
- imaging the temperature distribution obtained in said detecting;
- automatically detecting an air gap larger than or equal to a predetermined size contained in the gypsum-based building board by performing image processing on an image of the temperature distribution of the surface of the gypsum-based building board obtained in said imaging;
- and
- determining a part of the gypsum-based building board that contains the air gap as being defective, and automatically marking the part and ejecting the part outside a system of a manufacturing process.
4 more elements
Dependencies are inferred from the claim text.