Needleless electrospinning technology is an effective method for preparing large-scale nanofibers. In the present work, we developed a multi-hole curved surface rotary spinneret to fabricate sub-micro fibrous membrane with bimodal distribution structure. First, a finite element method was adopted to investigate electric potential and electric field strength of the spinneret; the formation of coarser and finer jets has been explained from the perspective of electric field. Then, the effects of solution concentration, applied voltage and spinneret rotation speed on the bimodal distribution fibers yield were optimized via quadratic general rotary unitized design (QGRUD). Lastly, the fiber diameter distribution and the mechanical properties of sub-micro fibrous membranes were characterized. The results suggested that the bimodal distribution sub-micro fibrous membranes exhibited excellent breaking strength and tensile modulus. This novel multi-hole curved surface rotary spinneret is promising for the high-output fabrication of sub-micro fibers with bimodal distribution.

无针静电纺丝技术是制备大规模纳米纤维的有效方法。在目前的工作中，我们开发了一种多孔曲面旋转喷丝头来制造具有双峰分布结构的亚微纤维膜。首先，采用有限元方法研究喷丝头的电位和电场强度；从电场的角度解释了粗细射流的形成。然后，通过二次通用旋转单元化设计（QGRUD）优化溶液浓度、施加电压和喷丝板转速对双峰分布纤维产量的影响。最后，表征了亚微纤维膜的纤维直径分布和机械性能。结果表明双峰分布亚微纤维膜表现出优异的断裂强度和拉伸模量。这种新型多孔曲面旋转喷丝头有望用于双峰分布的亚微纤维的高产量制造。