Dev.of a Process Raman Probe of Pulp as a Continuous Gauge of the Physical and Mechanical Properties of EndUse Product:A RealTime Spectrochemical Link from Fibre to Paper through Advanced Chemometrics

加拿大北方漂白针叶木硫酸盐（NBSK）市场纸浆代表了纤维强度、长度、细度和均匀性的全球基准。更好的纸浆质量控制，特别是其纤维强度，是保持这种优势在市场上的重要因素。纤维强度主要取决于纤维的固有特性，如纤维素的结晶度和化学成分，如木质素、半纤维素和己糖醛酸（HexA）。这些固有特性也会影响加工，如可消化性和可漂白性。此外，在制浆过程中纤维的变形程度也会影响纤维在成片过程中以网络形式传递强度的方式。所有这些参数都被证明是重要的，然而，除了木质素，没有一个可以很容易地及时测量过程控制。目前的研究将证明一种新的拉曼系统的原理，以及系统的化学计量方法，允许在恶劣的制造条件下快速获取光谱数据和确定的湿纸浆光谱化学分析。电光仪器研究将导致后向散射采样几何形状和共聚焦参数，再加上快速激光波长、功率和分辨率，所有这些选择都是为了最大限度地利用特征光谱特征中包含的信息。该仪器系统将结合复杂的化学计量学策略，采用小波变换和模板引导的遗传算法特征选择与多元分类，从原始拉曼光谱中提取最大的分析信息。将光谱化学观察与纤维和最终用途纸的传统特性相关联的分析程序将证明用于即时测定纸浆质量相对于纸张外观和强度的综合拉曼测量的原理。

Canadian northern bleached softwood kraft (NBSK) market pulps represent the worldwide benchmark for fibre strength, length, fineness, and uniformity. Better pulp quality control, especially its fibre strength, is important to maintain this superiority in the marketplace. Fibre strength depends mainly on intrinsic fibre properties such as the degree of cellulose crystallinity and chemical constituents such as lignin, hemicullose, and hexenuronic acid (HexA). These intrinsic properties also affect processing, such as digestibility and bleachability. In addition, the degree of fibre deformation incurred during pulping process also affects how the fibre delivers its strength in a network during sheet formation. All of these parameters have been shown to be important, however, aside from lignin, none can be easily measured in a timely manner for process control. The present research will prove principle on a novel Raman system, and systematic chemometric approach allowing for rapid spectral data acquisition and definitive spectrochemical analysis of wet pulp under harsh manufacturing conditions. Electro-optical instrumentation research will lead to backscattering sampling geometries and confocal parameters, coupled with express laser wavelength, power and resolution, all selected to maximize the information contained in signature spectral features. The instrument system will incorporate sophisticated chemometrics strategies, employing wavelet transform and template-guided genetic-algorithm feature selection with multivariate classification to extract maximum analytical information from raw Raman spectra. A program of analysis correlating spectrochemical observations with conventional characterization of fibre and end-use sheet properties will prove principle toward a comprehensive Raman gauge for the instantaneous determination of pulp quality vis-a-vis paper appearance and strength.