Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, ECTB 110-22a, 1983 May; :1-3
Health hazard control measures, work processes, and existing control technologies used in the production of earthenware products were evaluated at Royal China Company (SIC-3263), Sebring, Ohio, in September, 1982. The company employed 290 workers in the manufacture of table and kitchen articles from ball clays, kaolin, talc (14807966), flint (14808607), and feldspar. Material was received already ground and was stored in silos. From storage, material was weighed and blended with 20 percent water. After more mixing, material was extruded in column form, then conveyed to a shredding auger and deairing chamber. The material was then cut into slugs, formed on plaster molds, dried, and fettled. The fettled product was dried for 2 to 3 days, fired for 30 hours, then machine decorated, stamped, sorted, and glazed. After a final firing, setting pins were ground off and the finished product was inspected, sorted, packed, and stored or shipped to the consumer. Periodic safety training was provided, and eye, head and respiratory protection was used in designated areas. Local exhaust ventilation was provided at the glaze spraying operations. The author does not recommend an in depth study of this company since no unique state of the art control technologies are used.