Coagulating Processes of Impregnating Spun-Laced Non-Woven Substrates with PU Dispersion

PU dispersion was chosen as an impregnating agent to produce leather-like sheet on spun-laced nonwoven.Three typical coagulating processes were studied.It was found that the best coagulating process for the chosen PUdispersion to get the leather-like sheet was coagulation in a sodium chloride solution.The detailed study of coagu-lating processes in sodium chloride solution was carriedout and optimal condition was obtained.Some experi-mental results were elucidated.Keywords:PU dispersion,coagulating, impregnating,ar-tificial leather,spun-laced nonwoven.

Improvement of High-Speed Detection Algorithm for Nonwoven Material Defects Based on Machine Vision

Defect detection is vital in the nonwoven material industry,ensuring surface quality before producing finished products.Recently,deep learning and computer vision advancements have revolutionized defect detection,making it a widely adopted approach in various industrial fields.This paper mainly studied the defect detection method for nonwoven materials based on the improved Nano Det-Plus model.Using the constructed samples of defects in nonwoven materials as the research objects,transfer learning experiments were conducted based on the Nano DetPlus object detection framework.Within this framework,the Backbone,path aggregation feature pyramid network(PAFPN)and Head network models were compared and trained through a process of freezing,with the ultimate aim of bolstering the model's feature extraction abilities and elevating detection accuracy.The half-precision quantization method was used to optimize the model after transfer learning experiments,reducing model weights and computational complexity to improve the detection speed.Performance comparisons were conducted between the improved model and the original Nano Det-Plus model,YOLO,SSD and other common industrial defect detection algorithms,validating that the improved methods based on transfer learning and semi-precision quantization enabled the model to meet the practical requirements of industrial production.

Efficient and selective removal of Pb(Ⅱ) from landfill leachate using L-serine-modified polyethylene/polypropylene nonwoven fabric synthesized via radiation grafting technique

In this study,to efficiently remove Pb(Ⅱ) from aqueous environments,a novel L-serine-modified polyethylene/polypropylene nonwoven fabric sorbent(NWF-serine)was fabricated through the radiation grafting of glycidyl methacrylate and subsequent L-serine modification.The effect of the absorbed dose was investigated in the range of 5–50 kGy.NWF-serine was characterized by Fourier transform infrared spectroscopy,thermogravimetric analysis,and scanning electron microscopy.Batch adsorption tests were conducted to investigate the influences of pH,adsorption time,temperature,initial concentration,and sorbent dosage on the Pb(Ⅱ) adsorption performance of NWF-serine.The results indicated that Pb(Ⅱ) adsorption onto NWF-serine was an endothermic process,following the pseudo-second-order kinetic model and Langmuir isotherm model.The saturated adsorption capacity was 198.1 mg/g.NWF-serine exhibited Pb(Ⅱ) removal rates of 99.8% for aqueous solutions with initial concentrations of 100 mg/L and 82.1% for landfill leachate containing competitive metal ions such as Cd,Cu,Ni,Mn,and Zn.Furthermore,NWF-serine maintained 86% of its Pb(Ⅱ) uptake after five use cycles.The coordination of the carboxyl and amino groups with Pb(Ⅱ) was confirmed using X-ray photoelectron spectroscopy and extended X-ray absorption fine structure analysis.

Innovations and demand surge propel nonwoven fabric market growth

Nonwoven fabrics have become indispensable materials across various industries due to their versatility,durability,and cost-effectiveness.These fabrics are manufactured by bonding or interlocking fibers using mechanical,thermal,or chemical processes,instead of weaving or knitting.The nonwoven fabric market has witnessed significant growth in recent years,driven by technological advancements,increasing demand from various enduse industries,and shifting consumer preferences towards sustainable and eco-friendly materials.This article delves into the innovations and demand surge propelling the growth of the nonwoven fabric market.

水体净化用聚乳酸非织造材料的研究进展

总结水体净化用聚乳酸(PLA)非织造材料的制备、改性和应用研究进展。介绍了PLA的化学合成方法,概括了当前主要的PLA非织造材料制备技术并分析其各自特点。阐述了物理共混、表面涂覆、等离子体、化学接枝改性方法对PLA非织造材料性能和功能的影响,重点总结了PLA非织造材料在油水分离、染料吸附、重金属离子吸附等水体净化领域中的应用进展。认为:低成本化、生产规模化、易回收循环将成为水体净化用PLA非织造材料未来研究发展的重要导向。

非织造亚麻纤维复合材料的制备与性能

为满足市场对对复合材料高性能、绿色和环保的要求,本研究以聚对苯二甲酸乙二醇酯(4080纤维)为基体,亚麻纤维为增强体,采用针刺非织造技术和热压技术成功制备了一种工序简单、力学性能优异、可生物降解的亚麻纤维增强4080纤维的复合材料。研究了成型温度、成型时间、亚麻纤维含量对复合材料形貌、热稳定性、力学性能等的影响。结果表明,最佳模压工艺为温度180℃、时间12 min。亚麻纤维含量(质量分数)为40%时,复合材料拉伸强度、弯曲强度和弯曲模量最大,分别为36.51、40.56和1963.17 MPa。升温可使4080纤维熔融提高黏结性,但超180℃会破坏亚麻纤维组织;模压时间不足12 min,4080纤维熔融不完全,超12 min会破坏化学结构。亚麻纤维含量增加,拉伸强度等先增后减,断裂伸长率先减后增。热稳定性方面,4080纤维比例增大,起始热分解温度和最大热分解温度升高。形貌分析显示亚麻纤维含量为40%时,纤维黏附性最好。该工艺环境友好、简单,有望用于汽车内饰等批量生产。

盐酸多巴胺处理对PLA非织造布油水分离性能的影响

为了研究盐酸多巴胺对PLA非织造布油水分离性能的影响,采用质量分数为0.5%~1.0%的盐酸多巴胺对PLA熔喷非织造布和PLA纺黏非织造布进行处理,并对处理后的样品进行性能测试。结果表明:随着盐酸多巴胺质量分数的增加,处理后的PLA非织造布纤维表面盐酸多巴胺黏附量增加,且非织造布由疏水性转变为超亲水性;PLA纺黏非织造布单位面积质量的变化对盐酸多巴胺的黏附量影响较小;PLA非织造布拉伸应力随着盐酸多巴胺溶液质量分数的增加呈现先下降后上升的趋势;PLA熔喷非织造布对CCl_(4)/水和正己烷/水混合溶液正常表现为水可快速通过,而油性溶剂被拦截;相反,材料经油性溶剂浸润,油性溶剂可快速通过,而水被拦截的自主选择性,且其油水分离通量为1671.123 L/(m^(2)·h)和1697.951 L/(m^(2)·h);PLA纺黏非织造布对CCl_(4)/水和正己烷/水混合溶液的油水分离通量达到3852.743 L/(m^(2)·h)和3922.961 L/(m^(2)·h);PLA非织造布对正己烷/水混合溶液重复分离10次后,分离通量降幅较小,油水分离循环性较好。

形状稳定型非织造吸收芯体的制备与性能研究

针对传统纸尿裤芯体加工困难与吸液后易局部隆起、断层等问题,先通过梳理⁃针刺工艺制备了不同混纺比的超吸水纤维/再生纤维素纤维(SAF/RCF)非织造材料,得到具有最优吸液性能的样品(SAF混纺比60%),记为SR⁃2,后通过叠层方式,将SR⁃2封装进纸尿裤中,研究非织造吸收芯体的结构、吸液倍率、饱和吸收量、渗透性能。结果表明:SR⁃2对0.9%生理盐水吸液倍率达到(28.62±0.45)g/g,持液倍率达(19.45±0.61)g/g,吸液后呈一体凝胶状,只在厚度方向膨胀,且膨胀有限,形状稳定;随着SR⁃2层数的增加,非织造吸收芯体的质量和厚度也随之增加,吸液倍率呈现先升后降的趋势,其中非织造吸收芯体3层时的吸液倍率最大,为(22.58±1.3)g/g;通过调控不同层数SR⁃2,制备的非织造吸收芯体饱和吸收量、吸收速度和回渗量能够灵活满足不同失禁产品需求。

Investigation on the test method of rupture forces of thermal bonding seams in nonwovens shopping bags

超声波热黏合的非织造布接缝不同于普通机织物和针织物等的车缝接缝。运用正交试验设计方法，对纺粘法PP非织造布购物袋热黏合接缝断裂强力测试中的试样宽度、拉伸速率和隔距三个因素进行优化。试验结果表明，试样宽度对纺粘法PP非织造布热黏合接缝断裂强力的测试结果影响最大，并且接缝的断裂强力随着试样宽度的增加而增加。选用试样宽度为200mm、拉伸速率为50mm／min、隔距为100mm的组合所得出的测试结果能比较真实地反映实际的接缝断裂强力。

高密度聚乙烯超细纤维篷布的闪蒸-水刺法制备及其防水透湿性

为获得适用于户外高价值目标遮盖的高强轻薄超细纤维材料,利用闪蒸-水刺工艺制备了高密度聚乙烯(HDPE)超细纤维材料,并对其形貌结构、防护特性和力学性能进行测试。结果表明:所制备样品表现出致密的超细纤维非织造结构,即1~6μm的纤维相互纠缠成孔隙率为82.7%~85.9%、模态孔径为6~8μm的柔性多孔材料;纵向拉伸断裂强力和顶破强力随水针能量的增大分别提高到217.8 N和301.3 N,且柔软得分高于80;耐静水压随着样品单位面积质量增大到110 g/m^(2)而提高到6695.7 Pa,且透气率和水蒸气透过率分别为48.3 mm/s和2321.2 g/(m^(2)·24 h)。所制备样品兼具有高强、柔软和防水透气性,可作为篷布用于户外运动、物资存储和军用物资等安全防护。

Surface Treatment of PET Nonwovens with Atmospheric Plasma

In this study, polyethylene-terephthalate （PET） nonwovens are treated using an atmospheric plasma and the effects of the treatment time, treatment power and discharge distance on the ability of water-penetration into the nonwovens are investigated. The result indicates that the method can improve the wettability of PET nonwovens remarkably, but the aging decay of the sample＇s wettability is found to be notable as a function of the storage time after treatment due to the internal rotation of the single bond of surface macromolecules. As shown by SEM and XPS analysis, the etching and surface reaction are significant, and water-penetration weight is found to increase remarkably with the increasing power. This variation can be attributed to momentum transfer and enhanced higher-energy particle excitation.

A Thermoregulatory Flexible Phase Change Nonwoven for All‑Season High‑Efficiency Wearable Thermal Management

Phase change materials have a key role for wearable thermal management,but suffer from poor water vapor permeability,low enthalpy value and weak shape stability caused by liquid phase leakage and intrinsic rigidity of solid–liquid phase change materials.Herein,we report for the first time a versatile strategy for designed assembly of high-enthalpy flexible phase change nonwovens(GB-PCN)by wet-spinning hybrid grapheneboron nitride(GB)fiber and subsequent impregnating paraffins(e.g.,eicosane,octadecane).As a result,our GB-PCN exhibited an unprecedented enthalpy value of 206.0 J g^(−1),excellent thermal reliability and anti-leakage capacity,superb thermal cycling ability of 97.6%after 1000 cycles,and ultrahigh water vapor permeability(close to the cotton),outperforming the reported PCM films and fibers to date.Notably,the wearable thermal management systems based on GB-PCN for both clothing and face mask were demonstrated,which can maintain the human body at a comfortable temperature range for a significantly long time.Therefore,our results demonstrate huge potential of GB-PCN for human-wearable passive thermal management in real scenarios.

INVESTIGATION OF PARAMETERS OF NONWOVEN FILTER USED IN WHITE CELLS REMOVING

This paper is concerned with the relation between the parameters of nonwoven filter and removing of white cells. Melt-blown polypropylene nonwovens are used as filtration materials of white cells filter. According to the combination of different fiber diameter, different product density and different weight, optimized combination of parameters of nonwoven filter with more effective removing of white cells is obtained. The result is that removing of white cells is 96.90 percent; recovery of red cells is 92.27 percent.

Preparation and Application of Water Dispersible Graphene as Antistatic Agent for SMS Nonwovens

In this paper, glucose was used as a green reducing agent and a capping reagent in the synthesis of water dispersible graphene, while using exfoliated graphite oxide （GO） as the precursor with the modified Hummers method. Characterizations of the graphene were conducted by UV-visihle absorption spectroscopy and X-ray diffraction （XRD）. Then the spunlaid-melthlowing-spuulaid （SMS） nonwovens were treated with the graphene solution via pad-dry-cure process. The surface and the antistatic property of the obtained nonwovens were tested. The results showed that O. 1 mg/mL graphene solution exhibited good stability in water. When treated with this solution, the graphene could be evenly dispersed on SMS nonwovens and the nonwovens had an excellent antistatic performance and a high relatively antistatic durability.

Graft of Polybutylene Terephthalate Meltblown Nonwovens by Plasma Initiation and Their Surface Performance

Main factors affecting the low temperature plasma initia-tion and graft modification of acrylic acid onto polybuty-lene terephthalate(PBT)meltblown nonwovens are stud-ied.The relations between hydrophilic performance ofthe product and plasma power,treating time,andmonomer concentration are investigated.The surfaceperformances of grafted products are analyzed.It is ob-tained that hydrophilic performance of PBT nonwovens isgreatly improved due to the etching of the plasma andthe introduction of polar groups so as to meet the needsof leukocyte depleting materials.

Photo-Grafting Copolymerization of PP Nonwoven Fabric and Its Application for Acidic Dye Adsorption and Filtration

The monomer methacrylamido propyl trimethy ammonium chloride( MAPTAC) was copolymerized onto the fiber surface of polypropylene( PP) nonwoven fabric under ultroviole radiation. The weak acid red GN dye adsorption and adsorptive filtration performance of the resulted PP fabrics were investigated.The results showed that the grafting copolymerization preferred to happen in the inner layer of the fabrics. The water flux of the grafted fabrics decreases with the increase of grafting yield. The collapse of the grafted polymer chains causes the flux increase in acidic condition,or vice versa at alkaline version. The coiling of the polyelectrolyte chains upon the dye adsorption seems to violate the routine assumption of the rigid substrate, and this gets the adsorption energy constant negative. The static adsorption process follows the Lagergren's pseudo-second order kinetic equation. The removals of circa( ca.) 100% of the total permeation volume3 500 mL simulated dye wastewater was reached during permeation.The dye adsorbed fabrics were regenerated by the mixed media of the cationic surfactant / ethanol /water. The grafted fabric assumes stable fabric integrity and stability during permeation,and presents excellent dye adsorption capacity,easy desorption, and repeatable utilization.

Three-Dimensional Model Reconstruction of Nonwovens from Multi-Focus Images

The three-dimensional(3D)model is of great significance to analyze the performance of nonwovens.However,the existing modelling methods could not reconstruct the 3D structure of nonwovens at low cost.A new method based on deep learning was proposed to reconstruct 3D models of nonwovens from multi-focus images.A convolutional neural network was trained to extract clear fibers from sequence images.Image processing algorithms were used to obtain the radius,the central axis,and depth information of fibers from the extraction results.Based on this information,3D models were built in 3D space.Furthermore,self-developed algorithms optimized the central axis and depth of fibers,which made fibers more realistic and continuous.The method with lower cost could reconstruct 3D models of nonwovens conveniently.

Visual Evaluation of the Morphologic Structure of Nonwovens Using Image Analysis and Fractal Geometry

Nonwovens are fiber materials which are based on nonwoven technologies. For the complexity and randomness of nonwovens morphologic structures, it is difficult to express them effectively using classical method. Fractal geometry gives us a new idea and a powerful tool to study on irregularity of geometric objects. Therefore, we studied on the pore size, pore shape, pore size distribution and fiber orientation distribution of real nonwovens using fractal geometry combined with computer image analysis to evaluate nonwovens’ morphologic structures.

Improving the Compatibility of Biodegradable Poly (Lactic Acid) Toughening with Thermoplastic Polyurethane (TPU) and Compatibilized Meltblown Nonwoven

Poly (Lactic Acid) (PLA) is a biodegradable polymer which originates from natural resources such as corn and starch, offering excellent strength, biodegradability, nevertheless its inherent brittleness and low impact resistance properties have limited its application. On the other hand, Thermoplastic Polyurethane (TPU) has high toughness, durability and flexibility, which is one of the most potential alternatives for enhancing the flexibility and mechanical strength of Poly (Lactic Acid) (PLA) by blending it with a compatibilizer. With the aim to improve the mechanical and thermal properties of Poly (Lactic Acid) (PLA) meltblown nonwovens, The Thermoplastic Polyurethane (TPU) was melt blended with Poly (Lactic Acid) (PLA) at the different corresponding proportions for toughening the Poly (Lactic Acid) and the corresponding PLA/TPU MBs (meltblown nonwovens) were also manufactured. Joncryl ADR 4400 is mixed into the PLA matrix during processing. It was found that Joncryl had a much higher chain extension that substantially increased the molecular weight of the PLA matrix. SEM study revealed that Joncryl ADR 4400 is a good compatibilizer. Moreover, in this study, the crystallization, thermal and rheological behaviors of the corresponding PLA and TPU blends were also investigated. PLA/TPU MBs were also characterized by morphology and mechanical properties. The rheological property of the PLA/TPU meltblown nonwoven revealed that the viscosity is increasing as the amount of TPU is increasing in the blend, PLA/TPU meltblown nonwovens exhibited excellent mechanical properties;they are soft, elastic, and have certain tensile strength. New materials have potential applications in the medical and agricultural fields. Joncryl ADR 4400 compatibilized blends showed higher strength than simple PLA/TPU blends at the same PLA/TPU ratio.