To determine yeild and wastes of fiberboard manufacturing in different sections of fiberboard proccessing, two methods of random sampling and complete sample driving were used. both methods were compared with the traditional one (output/input method). The results of this study showed that the most waste was related to digesting and refining sections while, the least was observed in hot press section waste water. Moreover, there were no significant differences between wastes and yield figures in any section, using two different methods, (except for screening and digesting). In gengeral, the results indidcated that it is possilbe to evaluate wastes and the yield of fiberboard Inanufacturing in different sections using the random sampling method without any need to interrupt the production process.
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