Official Journal of the Japan Wood Research Society
Bleaching sequence | Viscosity (cP) | Brightness (% ISOa) | α-Cellulose (%) | |
---|---|---|---|---|
ECF bleaching sequence | ||||
D0–Ep–D1 | 10.3 | 89.2 | 98.2 | |
Psa–D0–Ep–D1 | 8.5 | 90.7 | 98.6 | |
TCF bleaching sequence | ||||
O–Psa–Ep–Psa–E | 9.6 | 81.6 | 95.9 | |
Bleaching conditions | ||||
D0 | Chlorine dioxide | ClO2 dosage: kappa factor 0.30 (2.9 %), 60 min, 70 °C, pH 3.4, PCb: 10 % | ||
Psa | Peroxymonosulfuric acid | Psa dosage: 0.2 %, 60 min, 70 °C, pH 3.0, PC: 10 % | ||
Ep | Extraction with peroxide | NaOH dosage: 1 %, H2O2 dosage: 1.4 %, 60 min, 70 °C, PC: 10 % | ||
D1 | Chlorine dioxide | ClO2 dosage: 0.5 %, 60 min, 70 °C, PC: 10 % | ||
O | Oxygen | Oxygen pressure: 0.5 MPa, NaOH dosage: 1 %, 60 min, 115 °C, PC: 30 % | ||
E | Extraction | NaOH dosage: 1 %, 60 min, 70 °C, PC: 10 % |