In melt spinning, the polymer precursor is directly extruded into the fiber. This process is relatively simple, fast, inexpensive, and environmentally friendly. First, the polymer is melted. Then, extruded via spinneret. Finally, the resultant fibers are cooled, solidified, and collected . For melt spinning, lignin must reach a purity >99% and a non-melting particle size of less than 1 micron. In melt spinning, to avoid the cross-linking and melting of fibers, it is preferred that lignin's glass transition temperature (Tg ) should be greater than the oxidation temperature . Generally, softwood kraft lignin (SKL) has a more cross-linked structure as compared to hardwood kraft lignin (HKL) which makes spinning of SKL more challenging than HKL. Therefore, Hardwood Kraft Lignin Permeate (HKLP), which acts as a softening agent, is added to SKL to improve its spinnability. SEM revealed that the resultant SKL with HKLP was smooth and heterogeneous and was achieved at 20-85°C above the Tg of the lignin samples. However, it was assumed that the addition of HKLP decreased the viscosity of the melt.