抄録
Studies were carried out on the preparation of a new chemical pulp from Leucaena latisiliqua (L.) Gillis chips (Ip. chips) by Hydrogen peroxide alkali (PA) process.
The cooking liquor of PA process is an aqueous solution containing, hydrogen peroxide, sodium hydroxide (as H 2 O 2 2% and Na 2O 20% based on dry matter) and small quantities of auxiliaries (EDTA 0.3%, anthraquione 0.1%). The liquor ratio to Ip. chips is 4.5 l/kg.
Hydrogen peroxide alkaline pulp (PAP : Total yield of 41-57%, rejects of 2.7-7.5% and screened 38-49%) was obtained from Ip. chips after cooking for one hour at 180-190°C.
By this process there was no need for recourse to disc refiners or other like processing machines.
The analyses of the unbleached pulp (Ip. PAP) were kappa no. 14.7-22.1, and brightness 28.5-35.0% Hunter. PAP 102 (Total yield 57.0%, rejects 7.5%, screened 49.5%, kappa no. 22.1) has breaking length 4.3 km, burst factor 2.3, tear factor 66, and folding endurance 11 at C.S.F. 448 ml.
Ip PAP 110 (Total yield 41.2%, kappa no. 14.7, brightness 35.0% Hunter) could be bleached to brightness 70.0% Hunter by one stage with sodium hypochlorite.
