Transformation of pulp into regenerated lyocell fibre involves a critical step of cellulose dissolution in aqueous NMMO solution. The objective of this work is to investigate the effect of using pre-swelled pulps derived from hardwood kraft sulphate (H-KS) and softwood kraft sulphate (S-KS) process, on cellulose dissolution. Pre-swelling at temperatures follows from 30 °C to 75 °C results in lowering of pulp crystallinity, and hence, was hypothesized to form a homogeneous solution with lower power consumption during the dissolution process. Experimental torque moments (proportional to power consumption) of the un-swelled and pre-swelled pulps at different temperatures were compared and correlated with the cellulose dissolution process. Further, a time based morphological study of cellulose dissolution was performed with the help of a microscopic investigation method. The quality of the dissolved dope was evaluated by optical image analysis, refractive index (RI), dope composition and thermal analysis (TGA/DSC). It was observed that by using pre-swelled pulps, homogeneous cellulose solution could be formed at lower processing temperature, consuming less time and power thereby making the lyocell process more energy-efficient and sustainable.

纸浆转化为再生的莱赛尔纤维涉及纤维素在NMMO水溶液中溶解的关键步骤。这项工作的目的是研究使用源自硬木硫酸盐硫酸盐（H-KS）和软木硫酸盐硫酸盐（S-KS）工艺的预溶浆对纤维素溶解的影响。在30°C至75°C的温度下进行预溶胀会降低纸浆的结晶度，因此，据推测在溶解过程中会形成具有较低功耗的均质溶液。比较了在不同温度下未溶胀和预溶浆的实验扭矩（与功率消耗成比例），并将其与纤维素溶解过程相关联。进一步，借助显微镜研究方法，进行了基于时间的纤维素溶解形态学研究。通过光学图像分析，折射率（RI），涂料组成和热分析（TGA / DSC）评估溶解的涂料的质量。观察到，通过使用预溶胀的纸浆，可以在较低的加工温度下形成均质的纤维素溶液，消耗更少的时间和功率，从而使莱赛尔工艺更加节能和可持续。