This research experimentally investigates the fiber and web formation process of an array of annular meltblown spinnerets. In this design, the molten polymer is extruded from an array of outlets, each of which is individually surrounded by a concentric high-velocity heated air stream. With its multirow capability, it potentially becomes a high-productivity microfiber fabrication process. We experimentally investigate the effects of critical processing parameters and material properties on the fiber and web formation process. First, the polymer thermal and rheological behavior is presented. Next, a detailed three-dimensional air temperature and velocity profile, measured in the absence of spinning fibers, is presented for an array of supplied temperatures and internal machine air pressures. Web analysis in relation to this air profile shows that smaller fibers in cooler air streams require shorter die-collector distances to form bonded fabrics. Calculations are then made that show polymer spinning temperature is largely determined by air temperature, a distinguishing feature of this meltblowing design. Finally, a full factorial variation of air temperature, air speed, and polymer throughput is shown that relates processing conditions to fiber diameter distribution. Median diameters are well described by an empirical model and ranged from less than 1 μm to almost 14 μm.

中文翻译：

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使用环形熔喷喷丝板的纤维形成过程和网结构的实验研究

本研究通过实验研究了一系列环形熔喷喷丝头的纤维和纤网形成过程。在这种设计中，熔融聚合物从一系列出口中挤出，每个出口都被同心的高速加热气流单独包围。凭借其多排能力，它有可能成为一种高生产率的超细纤维制造工艺。我们通过实验研究了关键加工参数和材料特性对纤维和成网过程的影响。首先，介绍了聚合物的热和流变行为。接下来，在没有纺丝纤维的情况下测量的详细的三维空气温度和速度分布图针对一系列提供的温度和机器内部空气压力提供。与这种空气分布相关的纤维网分析表明，较冷空气流中的较小纤维需要较短的模头收集器距离以形成粘合织物。然后进行计算，表明聚合物纺丝温度在很大程度上取决于空气温度，这是这种熔喷设计的一个显着特征。最后，显示了空气温度、空气速度和聚合物产量的全因子变化，这将加工条件与纤维直径分布相关联。经验模型很好地描述了中值直径，范围从小于 1 μm 到几乎 14 μm。显示了空气温度、空气速度和聚合物产量的全因数变化，这些变化将加工条件与纤维直径分布相关联。经验模型很好地描述了中值直径，范围从小于 1 μm 到几乎 14 μm。显示了空气温度、空气速度和聚合物产量的全因数变化，这些变化将加工条件与纤维直径分布相关联。经验模型很好地描述了中值直径，范围从小于 1 μm 到几乎 14 μm。