the majority of the specific energy was applied during the refiner outer runs different conditions of refiner plate direction expel and holdback and applied power were evaluated during the outer runs in this investigation each of the primary refined pulps was then refined in a secondary atmospheric andritz 401 refiner at three levels of applied specific energy control tmp series were also produced without destructuring of the wood chips in the pmsd this was accomplished by decreasing the production rate of the inners control run from 24 1 odmtpd to 9 4 odmtpd this effectively reduced the plug of chips in the pmsd the plates were backed off during the control inners run such that size reduction was accomplished using only the breaker bars i e no effective refining action by the refiner fiberizing bars following the breaker bars the inners chips were then refined in the 36 1cp refiner using the outers plates the primary refined pulps were then refined in the andritz 401 refiner at several levels of specific energy table a presents the nomenclature for each of the refiner series produced in this trial study the corresponding sample identifications are also presented table a sample identification primary primary nomenclature inners outers secondary f rt 1800 hb 485 ml a1 a4 a7 a8 a9 f rt 1800 ex.