Papers by Author: Yan Bo Liu

Abstract: Abstract: A novel enzymatic processing with the characteristic of applying protease and a proposed activator simultaneously was suggested in the present study for the purpose of producing high quality wool top. Experiments results showed there existed a synergistic effect between the protease and its activator on restricting enzyme hydrolyzing function on the outer layer of wool fiber and removing scale effectively, compared with using protease and activator separately. It was observed that 75%-80% content of activator was consumed while almost no enzyme consumed in the integrative enzyme catalysis system. Furthermore, after the proposed protease treatment, relative test showed the felting ball density decreased by 50% and averaged fiber diameter decreased by 1.393μm, with the tension retention more than 80%, and elongation at break maintaining more than 73% in comparison with the untreated one, implying desired slenderization and improvement of felting behavior of wool fiber

Abstract: This paper discloses a method for producing nanofibers by a needleless electrospinning process based on the metal (card) clothing. 20% w/w polyvinyl alcohol (PVA) solution was employed to demonstrate the feasibility of this new electrospinning technology. Different types of metal clothing were used to produce PVA nanofibers under different voltages in the experiments; theoretical analysis of this new electrospinning method was also carried out to understand the experimental results. The results indicated the great potential for scaling up this new avenue for producing nanofibers through electrospinning, especially when medium sized clothing was used in the new process.

Abstract: In the current study, the finite element analysis was used to simulate the change in electric field intensity due to the change of needle diameter and length, receiving distance，voltage and the spacing between needles located in a row. The resulting conclusion could be used to guide the design and manufacture of electrospinning machines at industrial scale.