Laccase impregnation during mechanical pulp processing: improved refining efficiency and sheet strength
Laccase impregnation during mechanical pulp processing: improved refining efficiency and sheet strength
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发表时间：
2002
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通讯作者：
S. Mansfield
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作者：
S. Mansfield
本研究考察了漆酶(一种针对木材木质素的酶)对辐射松机械浆的精细化和造纸性能的影响。结果表明，用漆酶制剂浸渍辐射松木片可以降低机械浆料生产中的打浆能耗，∼可达5%~8%。这些能量节约是在对所产生的配料的光学性质几乎没有改变的情况下实现的。此外，如增强的撕裂-拉伸关系所示，所生产的手纸的强度普遍增加。同样明显的是，由动态成型机形成的板材(表现出纤维取向)不太容易受到压延过程中通常观察到的强度下降的影响。所有观察到的修改都是在没有任何产量损失的情况下实现的。观察到的改进表明，应进一步考虑将漆酶用于机械浆的加工。例如，在制造主要由机械配料组成的某些纸种(如新闻纸和目录纸)时，可以使用较少的硫酸盐增强纸浆纤维，因为这些酶促生成的纤维似乎显示出增强的纤维间粘合能力。
This study examines the effects that laccase, an enzyme which targets wood lignin, has on the refinability, and consequently the papermaking properties, of a radiata pine mechanical pulp. The results indicate that impregnation of radiata pine woodchips with a laccase preparation could reduce refining energy consumption, by as much as ∼5 to 8%, in the generation of mechanical pulp furnishes. These energy savings were attained with little alteration to the optical properties of the furnishes generated. Furthermore, there was a general increase in the strength of the handsheets produced, as indicated by the enhanced tear-tensile relationship. It was also apparent that sheets formed by a dynamic former (exhibiting fibre orientation) were less susceptible to the strength reductions commonly observed during the calendering process. All of the observed modifications were attained without any yield loss. The observed improvements suggest that further consideration should be given to the use of laccase for the processing of mechanical pulps. For example, it may be possible to use less kraft reinforcing pulp fibres during the manufacture of certain paper grades predominantly composed of mechanical furnishes, such as newsprint and directory papers, as these enzymatically-generated fibres seemed to demonstrated enhanced interfibre bonding capacities.