Textile and Paper Engineering Department, ETSEIAT, Universitat Politècnica de Catalunya, Colom 11, E-08222 Terrassa, Spain.
Bioresour Technol. 2010 May;101(10):3554-60. doi: 10.1016/j.biortech.2009.11.105. Epub 2010 Jan 13.
Brightness in totally chlorine-free (TCF) pulp is more unstable than it is in elemental chlorine-free (ECF) pulp, seemingly by effect of the former containing greater amounts of oxidizable structures such as hexenuronic acids (HexA). Accelerated ageing tests involving the application of moist heat to pulp revealed that brightness reversion can be alleviated by using an effective biotechnological method involving an enzyme-mediator treatment. Thus, the joint use of laccase from Trametes villosa and the mediator hydroxybenzotrialoze (HBT) in TCF pulp removes hexenuronic acids by 23% and reduces brightness reversion by 8.4%. Additional tests conducted to assess the effect of HexA on pulp refining revealed that these oxidizable structures introduce hydrophilicity in the pulp. Removing hexenuronic acids from TCF pulp alters its refining outcome as regards drainability ( degrees SR) and water retention capacity (%WRV); also, it leads to paper with comparable strength-related properties which requires no additional refining energy.
全无氯（TCF）浆的白度比元素氯全无氯（ECF）浆更不稳定，这似乎是由于前者含有更多可氧化的结构，如己烯糖醛酸（HexA）。对浆粕进行湿热加速老化试验表明，采用有效的生物技术方法，用酶-介体处理，可以缓解白度的衰退。因此，在 TCF 浆中联合使用木蹄层孔菌漆酶和介体羟基苯并三唑（HBT），可以去除 23%的己烯糖醛酸，降低 8.4%的白度衰退。为了评估 HexA 对纸浆打浆的影响而进行的其他测试表明，这些可氧化结构会使纸浆具有亲水性。从 TCF 浆中去除己烯糖醛酸会改变其可滤水性能（度 SR）和保水能力（%WRV）；还会导致纸张具有可比的强度相关性能，而不需要额外的打浆能量。
