Comparative study of paper sheets from olive tree wood pulp obtained by soda, sulphite or kraft pulping

Paper sheets from olive tree wood pulp obtained by soda, sulphite or kraft pulping were studied to examine the influence of pulp beating on properties of the paper sheets. Paper sheets from kraft and sulphite pulps exhibited the highest resistance , and sulphite pulp the highest brightness. Soda pulp required more intensi ve beating than did kraft or sulphite pulps; in fact, the PFI beater had be operated at a 40-50% higher number of beating revolutions to obtain soda p ulp with 70-80 degrees SR. The breaking length, stretch, burst index and tear index of paper sheets ob tained from kraft pulp, beaten to a Shopper-Riegler index of 70-80 degrees SR were 20-30%, 30-50%, 50-60% and 15-35% higher, respectively, than those of sheets obtained from soda pulp. (C) 1999 Elsevier Science Ltd. All right s reserved.