Lyocell纤维直接成网工艺优化与性能分析  

Optimization and performance analysis of Lyocell fiberdirect web formation process

作　　者：张帆 程春祖 郭翠彬 张东 程敏 李婷 徐纪刚 ZHANG Fan;CHENG Chunzu;GUO Cuibin;ZHANG Dong;CHENG Min;LI Ting;XU Jigang(State Key Laboratory of Bio-Based Fiber Materials,China Textile Academy,Beijing 100025,China)

机构地区：[1]中国纺织科学研究院有限公司生物基纤维材料全国重点实验室,北京100025

出　　处：《纺织学报》2025年第3期34-40,共7页Journal of Textile Research

摘　　要：针对Lyocell纤维直接成网技术,深入分析了液流牵伸装置的结构参数,包括加速流道的入口、出口宽度以及底板宽度,探究了这些参数对液流速度的影响。通过优化这些结构参数,显著提升了液流速度,使其达到217 m/min,为Lyocell纤维的快速牵伸提供了技术基础。进一步探讨了液流牵伸工艺参数对非织造材料性能的影响。此外,研究了液流牵伸工艺参数如液流速度、N-甲基吗啉-N-氧化物(NMMO)浓度和液流温度对非织造材料的结晶度、断裂强力、吸液率、透气率和柔软度的影响。通过实验确定了最优工艺参数,制备出的非织造材料具有以下特性:纵向断裂强度为35~40 N,横向断裂强度为18~25 N,吸液率为1100%~1200%,透气率为4600~4900 mm/s,干态纵向柔软度为240~280 mN,干态横向柔软度为60~70 mN,湿态纵向柔软度为80~100 mN,湿态横向柔软度为49~56 mN。Objective Lyocell fiber direct web formation is an innovative method of preparing nonwoven materials by drafting a cellulose solution through a liquid stream and directly webbing the filaments by a dry-spray wet method using air gap cooling.It has the advantages of short preparation process,low investment in equipment and small footprint.The prepared non-woven material has high strength,good softness,good moisture absorption and air permeability,and low flaking rate,and can be applied in the fields of beauty mask,medical gauze,high-end wiping paper,and tea bags.Method In this research,the liquid flow rate of the liquid flow drafting device under different structural parameters was investigated,and the crystallinity,breaking strength,liquid absorption rate,permeability and softness of the materials prepared under different liquid flow rates,different liquid flow NMMO concentrations an d temperatures were studied comparatively,so as to determine the optimal structural parameters of the device and the liquid flow process parameters.Results In the case of constant accelerating fluid flow rate,the total fluid rate increased with the increase of the ratio of the accelerating runner inlet and outlet widths(d_(0)/d_(1)).However,if d_(0)/d_(1) value is too large,the accelerating fluid flow outlet pressure would be too large,which is prone to cause the non-uniformity of the fluid velocity.As the width of the bottom plate increased,the liquid flow velocity was decreased,and the width of the bottom plate was preferably 3-4 mm.As the liquid flow rate increased,the diameter of the fiber gradually became finer,and the finest was 9μm in diameter,and the crystallinity and orientation of the fiber gradually increased with the increase of the liquid flow rate.The longitudinal and transversal breaking strengths of the nonwoven materials showed a tendency to increase with the increase of the liquid flow velocity.With the increase of the liquid flow rate,the liquid absorption rate and air permeability of the nonwoven materials demons

关 键 词：纤维素溶液 LYOCELL纤维 直接成网 液流牵伸 吸湿透气性 柔软度 

分 类 号：TS174[轻工技术与工程—纺织材料与纺织品设计]