In this study, regenerated Bombyx Mori (B. Mori ) silk fibroin from two aqueous solvents was analyzed for structural deviations. Results from Fourier transform infrared spectroscopy (FTIR) and Wide angle x-ray diffraction (WAXD) implied great alteration in the secondary structure, crystallinity and molecular weight due to the regeneration process.

Jet repulsion is the most difficult issue in the multineedle electrospinning process. This study aims at reducing the jet pulsion by designing the spinneret. Three different multijet electrospinning configutations are used to study the jet repulsion in multijet electrospinning process. The experimental results shows that adding a PTFE cylinder to the traditional multineedle electrospinning setup can reduce the jet repulsion, but the diameter and irregularity of the resultant fiber other increased. A needleless electrospinning setup using a multihole plate to replace the needles can reduce jet repulsion effectively, reduce fiber diameter and irregularity as well. And the electric fields of the three electrospinning configurations are simulated by finite element method to explain the experiment results.

To meet a high production requirement and high quality of nanofiber, a new disgned multihole spinneret with equilateral hexagon hole array of is used in this paper. We study the effects of two structural parameters of the multihole system on fiber diameter and fiber mats. 3D electric fields were simulated to understand the effects of electric field distribution on electrospinning performance. This study shows that fine and uniform fibers, as well as concentrated and uniform fiber mat can be obtained by this multihole electrospinning system at a high production rate.

Metal content of metallized fiber can be determined by density testing and calculating. The weight of plated metal’s percentage of metallized fiber can be derived form measuring the weight of metallized fiber, and using the density formula and the law of conservation of mass with knowing the density of plated metal and the basic fiber. The characterization and measurement of the metal content of the metallized fiber at home and abroad is compared, the principle of the determination method by density testing is analyzed, the principle of the determination method by density testing is analyzed, and the specific operation is discussed while the silver content determination of silver-plated fiber is as an example, which provides a simple and convenient means for the determination of metal content of the metallized fiber..

Melt blowing is an important process for producing nanofibrous nonwovens. Compared to another technology for producing nanofibrous nonwovens, electrospinning, melt blowing applies high-speed air flow field to attenuate the extruded polymer jet. In this study, the air flow field of a swirl die melt-blowing process was simulated by CFD software, Fluent 6.3. The swirling air profile was shown. Meanwhile, a high-speed camera was used to capture the fiber path below a single-orifice melt-blowing swirl die. The spiral motion of the fiber was revealed. The relationship between the fiber path and the air flow field was discussed. This paper shows the relationship between the fiber path and the air flow field in a swirl die melt-blowing process.