Mechanical pulping

目标-短期目标是寻找创新的方法来提高机械纤维的质量，以便它可以用于高性能等级或新等级的纸制品，而长期目标是提高机械纤维的最高价值，以便它可以提供新的或增强的效益，并降低制造成本。研究计划和科学方法- 1。剪切力和压缩力对纤维分离和表面纤颤的影响：实验室PFI磨机可以修改以提供不同的剪切压缩比。其他条件，如精炼间隙和纸浆稠度也可以改变。纸浆的特性，如自由度、拉伸、破裂、撕裂、光散射、不透明度、保水值、纤维长度分布、细度、卷曲、扭结、粗糙度、细胞壁厚度和柔韧性将被确定。SEM和XPS研究也将进行。2。TMP对长纤维的氧化作用：利用臭氧和4-乙酰胺- temp氧化可以弥补机械纸浆长纤维粘结能力差的问题，在纤维表面产生酸性基团，这对纤维间的粘结很重要。3所示。TMP纤维的阳离子化：机械纸浆长纤维带负电荷的表面可被阳离子化，使其与短纤维、细纤维、填料和保留剂有较好的附着力。纤维表面的阳离子化可以用一种称为3-氯-2-羟丙基三甲基氯化铵（CHPTMAC）的阳离子剂来完成，这种阳离子剂通常用于淀粉的阳离子化。

Objectives - The short term objective is to search for innovative ways to enhance the quality of mechanical fibre so that it can be used in high performance grades or new grades of paper products, while the long term objective is to raise mechanical fibre to its highest value so that it can provide new or enhanced benefits and reduce manufacturing costs. Research Programs and Scientific Approaches - 1.  Influence of shear and compressive forces on fibre separation and surface fibrillation:  A laboratory PFI mill can be modified to provide varying shear-to-compression ratios. Other conditions such as refining gap and pulp consistency can also be varied. Pulp characteristics such as freeness, tensile, burst, tear, light scattering, opacity, water retention value, fibre length distribution, fines, curl, kink, coarseness, cell wall thickness and flexibility will be determined. SEM and XPS studies will also be conducted. 2.  Oxidation of long fibres from TMP: The poor bonding capacity of long fibres of mechanical pulp can be remedied by oxidation using ozone and 4-acetamido-TEMP, generating acidic groups on fibre surface which is important for inter-fibre bonding. 3.  Cationization of TMP fibres: The negatively charged surface of long fibres of mechanical pulp can be cationized to yield better adhesion with the short fibres and fines, and with filler and retention agents. Cationization of fibre surface can be done using a cationizing agent called 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CHPTMAC), which is commonly used to cationize starch.