n eupex 95 H3-HH26A Helical gear box H3

Flender/Flender Gear Units/Helical gear box H3

e $emonstration plant is situated. As for decorative paper purposesaspecialattention must be aidtothecleannessofthepulpthestockprepara- tion has to be carried out accordingly careklly. Tominimizethe lossof solventfresh water isonlyfedattheendof pulpscreening (unbleached ulp) and led counter-currently to the hi-heat wash. Compared to cleanness articularly high grightness of the pulp is not aimed at. Therefore bleaching could be limitecfto three steps; nevertheless brightness of 8% IS0 can be achieved that way. Solvent recover within falling film evaporators has been carried out in such extent that there is less than 1 / ormethanol in the concentrated black liquor. The degree of sodium hydroxide recovery is determined by consideration of costs. Basis forthis are parameters found out during operation of the electrolysis. The operation ofthedemonstration plant is checked bylaboratorycontrols.Thatapplies above alltothequalityconstancyofthe main products(pulp,lignin) butalso the occurrenceofby pro- ducts (.. resins, acids) is dealt with. 3. Results Numerous laboratory and lant tests were carried out to digest several woods and annual lants and to optimize the femonstration plant The adaption of the cooking conditions to dif- rerent wood species can be erformed very easily pulp quality comparable to that of sul- phate pulp could be reachexreproducibl with native spruce as raw material concept for chemical recovery and for the recovery orthe dissolved lignin has been developed Dtscontinuously operated test runs of the demonstration plant corresponded well to the pulp quality and the process parameters of the previous pilot plant The process parameters have been optimizedand the plant has been adapted to meet all requirements The pul bleached in three steps has been tested with regard to itssuitability as paper pulp and fluff pub Papertest- in showedthatallvalueswereto befoundwithin theallowed tolerance limits Thefour-colour o8set printabilit of