Labels:bulletin board | hakham | sky | window OCR: Abuse and Impact Manufacturing Gypsum rock is mined crushed, dried and ground to fine powder The powder calcined' to drive off the remaining chemically combined water (This produces product commonly called "plaster of paris 'stucco The calcined gypsum is mixed with water and other ingredients to form slurry which IS fed between continuous rolls of paper As the paper slurry sandwich moves down the conveyer line the gypsum rehydrates and returns to its original rock state The board is cut to the desired length and dried further before shipping betweer snsdAf desirea aried furthet
