熔喷模头的设计及试验
2021-03-04刘金南程寿国王益辉周琦杨非凡
刘金南 程寿国 王益辉 周琦 杨非凡



摘 要:熔喷布的质量对病毒预防功能的有效发挥至关重要。针对熔喷布生产过程中生产效率低、安装难度大、调节不方便等问题,本文设计了一种可调节的熔喷模头,熔喷模头主要由侧板、喷丝板、导风板、底板、风道调節块、热电偶以及连接件组成。在对气道及侧板结构工作原理进行分析研究的基础上,通过熔喷生产线上试验,结果表明:生产的熔喷布厚度均匀,产量提高了10%;在静电驻极处理后,经专业测试机测试,过滤效率达到95%以上,改进效果显著。
关键词:熔喷模头 调节 侧板 过滤效率
Design and Test of Meltblown Die Head
Liu Jinnan,Cheng Shouguo,Wang Yihui,Zhou Qi,Yang Feifan
Abstract:The quality of meltblown cloth is very important to the effective function of virus prevention. Aiming at the problems of low production efficiency, difficulty in installation, and inconvenient adjustment during the production of meltblown cloth, this paper designs an adjustable meltblown die head. The meltblown die head is mainly composed of side plates, spinnerets, and air guides, bottom plate, air duct adjustment block, thermocouple and connecting parts. Based on the analysis and research on the working principle of the air passage and side plate structure, through the meltblown production line test, the results show that the thickness of the meltblown cloth produced is uniform, and the output is increased by 10%; after the electrostatic electret treatment, the professional tested by the testing machine, the filtration efficiency is over 95%, and the improvement effect is remarkable.
Key words:meltblown die head, adjustment, side plate, filtration efficiency
1 引言
近年来,世界范围内各类新型病毒不断出现,对人类安全造成威胁。优质的熔喷布是隔离病毒的主要防护成分。尽管熔喷布产量已经翻了几番,PP 熔喷布是以聚丙烯为原料,采用熔喷模头借助高速热气流的喷吹下形成超细纤维,并在气流作用下自身粘合形成的非纺织材料。
目前市面上生产的 PP 熔喷布质量的好坏主要取决于熔喷模头的质量,国内生产的熔喷模头质量参差不齐,大部分还是依赖进口,成本高、供货周期长。本文对现有的熔喷模头进行改进设计,使其拆装方便,并能提高原料利用效率,降低生产成本,提高产品质量。
2 熔喷工艺分析
熔喷非织造技术的生产工艺是采用较高熔融指数(简称MF1)的聚合物通过喂料装置吸入,通过螺杆挤出机挤压,经过多段加热区使原料融化成液态溶体,随后经过滤网过滤掉熔体中的杂质,再由计量泵把熔体精确计量送入熔喷模头内。……
