Optimization of Mechanical Pulp Quality in Multi-Stage Refining Systems

该提案的目标是开发必要的工具、方法和理解，以更好地利用不列颠哥伦比亚省复杂的天然纤维基地；一种含有多种品种的纤维基材，在高价值纸张中使用具有挑战性。尽管我们的森林有着极其多样化的物种组合，给造纸商带来了巨大的困难，但通过先进的纤维加工，有可能发现我们森林的内在优势。本建议特别研究了先进纤维分馏和多阶段精炼的应用，以生产高价值的机械印刷纸，可以在传统上由涂布纸和自由单张纸主导的市场上竞争。研究可以分为三个不同的领域，其中前两个领域侧重于完成第三个核心项目所需的工具开发和过程知识。1. 开发了一种通过纸浆沉降试验测量纤维表面积和纤维网络顺应性的新方法。2. 应用沉降试验，了解使用压力筛分馏纤维如何改变被送到多阶段废渣精炼过程的纤维的质量。3. 应用新的测量方法来了解纤维种类、纤维分馏和多级精炼将如何影响纤维表面积和纤维网络的顺应性。拟议的研究将与norsk - canada Crofton工厂密切合作进行，并在该工厂和UBC进行实验性精炼和分馏试验。

The objective of this proposal is to develop the tools, methods and understanding necessary to better utilize the complex natural fibre base in British Columbia; a fibre base that contains a wide variety of species that are challenging to use in high value paper grades.  Although our forest, with its extremely diverse species mix, presents significant difficulties for the paper maker, it may be possible, though advanced fibre processing, to discover an inherent advantage in our forest.  This proposal specifically examines the application of advanced fibre fractionation and multi-stage refining to produce high value mechanical printing papers that can compete in markets traditionally dominated by coated and free sheet papers.   The research can be broken into three distinct areas where the first two focus on tool development and process knowledge required to complete the third, core project.    1. Development of a new and novel method of measuring fibre surface area and fibre network compliance through a pulp sedimentation test.   2. Application of the sedimentation test to understand how fibre fractionation using pressure screens changes the quality of the fibres being sent to the multi-stage reject refining process. 3. Application of the new measurement to understand how species, fibre fractionation and multi-stage refining will affect fibre surface area and fibre network compliance. The proposed research will be conducted in close collaboration with Norske-Canada Crofton mill with the experimental refining and fractionation trials being conducted at the mill and at UBC.