纺黏非织造布工艺参数对纤维直径的影响

对有关纺黏工艺参数对纤维直径的影响进行了仿真实验和讨论,对不同的工艺参数进行了数值模拟,并对聚合物细流的最终直径进行了实测,发现聚合物挤出量越小,聚合物熔体温度越大,气流初始温度越高,气流初始速度越大时,越有利于聚合物熔体的气流牵伸,纤维直径越小;实验结果显示:测试结果与模型预测值十分吻合。本研究也显示了在对纺黏非织造布工艺和设备进行计算机辅助设计方面具有较好的应用前景     

阻燃PP纺粘无纺布的性能研究

研究了阻燃母粒法和整理法制得的阻燃PP纺粘无纺布的力学性能、热性能和阻燃性能。结果表明:阻燃母粒法制得的阻燃PP纺粘无纺布的断裂强力与PP纺粘无纺布的接近,但断裂伸长率要低,后整理法制得的纺粘无纺布的力学性能与PP纺粘无纺布的接近;两种方法制得的阻燃PP纺粘无纺布的热性能均优于PP纺粘无纺布,在1000℃左右时,有24.0%～33.2%的炭残渣,成炭性较好;两种方法制得的阻燃PP纺粘无纺布的阻燃性能良好,其中用阻燃剂B整理后的PP纺粘无纺布其阻燃效果优于阻燃剂A整理的PP纺粘无纺布。     

PET纺黏法非织造布工艺流程及参数设定

介绍了PET纺黏法非织造布生产的工艺流程,从结晶、干燥、纺丝温度、熔体压力、侧吹风冷却、纺丝速度、气流拉伸、分丝、铺网、加固等方面阐述了工艺参数的设定。     

断裂纤维及工艺对纺粘法PP纤维直径的影响

采用弹性球-弹性杆的纤维运动模型,建立了纺粘法生产断裂纤维的运动方程;通过计算机数值模拟的方法分析了工艺参数对聚丙烯(PP)纤维直径的影响。实验表明,根据断裂纤维运动模型和方程预测的PP纤维直径与实测值吻合;聚合物挤出量越小,熔体温度越高,骤冷压力、气流初始温度和吸风速度越大,文丘里间隙适中时,纤维直径越小,有利于提高成网质量。     

纺黏法非织造布的生产技术

介绍了纺黏法非织造布技术的起源、工艺原理、工艺类型、原料、新技术和发展方向,指出新型纺黏设备应具有效率高、能耗少、灵活性好、适应性强、保养方便和产品品质优的性能。     

聚乙烯纺粘非织造布生产技术初探

采取高温纺丝和较低的侧吹风速度冷却,在聚丙烯(PP)纺粘生产线上生产聚乙烯(PE)纺粘非织造布,探讨了其生产工艺。结果表明:采用熔融指数(每10min)20g的PE为原料,选择纺丝温度250℃,侧吹风速度1.5～1.8m/s,侧吹风温度16～18℃,气流速度5000m/min,生产的PE纺粘非织造布单丝线密度2.16dtex,断裂强度0.68～1.61cN/dtex,断裂伸长率150%～165%。     

Influence of processing parameters on fibers diameter and web evenness of polypropylene spunbonding nonwoven fabrics in wide slot positive pressure drafting assembly of spunbonding process

The air drawing model of polymer polypropylene (PP) spunbonding nonwovens has been established. The influences of the density and the specific heat capacity of polymer melt at constant pressure changing with polymer temperature on the fiber diameter have been studied. The air drawing model of polymer in spunbonding is confirmed by the experimental results obtained with our university's equipment. The effects of the processing parameters on fibers web evenness of PP spunbonding nonwoven fabrics in wide slot positive pressure drafting assembly of spunbonding process have also been investigated. The predictions of the filament fiber diameters, crystallinities, and birefringences are coincided well with the experimental data. It is found that a medium polymer melt temperature, monomer suction wind speed, drawing pressure, cross air blow speed, and air control distance have a significant influence on the web evenness and quality, which are beneficial to produce more uniformity fibers web. The experimental results show that the agreement between the results and experimental data is very better, which verifies the reliability of these models. At the same time, the results also reveal the great potential of this research for the computer‐assisted design (CAD) of spunbonding technology. POLYM. ENG. SCI., 58:1268–1277, 2018. © 2017 Society of Plastics Engineers     

纺粘工艺参数和牵伸器设计几何参数对纤维直径的影响

建立了纺粘聚合物气流牵伸模型,采用计算机数值模拟方法求解牵伸器的喷射流场,分析了纺粘工艺参数和牵伸器设计几何参数对纤维直径的影响,得出了影响规律。     

纺黏非织造布性能的测试及分析

对纺黏非织造布材料等的形态结构、织物厚度、面密度、悬垂性、断裂强力、顶破强度、耐磨性、透湿性能、透气性能等进行了测试。实验发现非织造布材料的这些性能、均与克数和厚度有一定关系,适合开发各类功能性产品,在纺织工业上有广泛的应用。     

A physical–mathematical model for the prediction of fiber diameter of the polyethylene terephthalate (PET) spunbonding nonwoven fabrics

A mathematical model of air drawing of a polyethylene terephthalate (PET) polymer in a spunbonding nonwoven process was established and solved by introducing the numerical computational results of the air jet flow field of the attenuator. The predicted fiber diameters, crystallinities, and birefringences agreed well with the experimental data. The air jet flow field model was solved and simulated by means of the finite difference method. The numerical simulation computation results of distributions of the air velocity matched quite well with the experimental data. The air drawing model of the polymer was solved with the help of the distributions of the air velocity measured by a particle image velocimetry. The effects of the processing parameters on the fiber diameters, measured with the aid of an image analysis method, are further discussed. A lower polymer throughput rate, higher polymer melt initial temperature, higher air initial temperature, higher air initial speed, lower venturi gap, higher air suction speed, and higher quench pressure can all produce finer filament fibers. The results demonstrated the great prospects for this research in the field of computer‐assisted design (CAD) in the spunbonding technology field. POLYM. ENG. SCI., 58:1213–1223, 2018. © 2017 Society of Plastics Engineers     

Preparation of pseudocapacitor electrodes via electrodeposition of polyaniline on nonwoven carbon fiber fabrics

Aniline has been polymerized via electrodeposition onto various nonwoven carbon fiber fabric (CFF) substrates for use as a pseudocapacitive electrochemical capacitor. Four types of CFF were initially tested for double layer capacitance before polyaniline deposition, and again for specific capacitance after deposition. A binder‐free CFF was selected for further analysis due to its high capacitance change following PANI deposition (three orders of magnitude). The aniline monomer concentration, deposition potential, and deposition time were varied and resulting materials were characterized using chrono‐potentiometry, cyclic voltammetry, and scanning electron microscopy. The deposition potential range yielding highest capacitance was found to be between 0.744 and 0.777 V. A solution concentration of 0.5M aniline at a 20 min deposition time resulted in the highest specific capacitance (>80 F/g based on total electrode mass and >300 F/g based on PANI mass) within this study. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43315.     

轻薄型纺黏非织造布性能的测试及分析

选用不同厚度的纺黏非织造布、熔喷非织造布以及SMS复合非织造布作为实验材料,测试了轻薄型纺黏非织造布材料等的性能,通过对这些材料的织物内纤维排列、厚度、面密度、拉伸断裂强力、撕破强力、顶破强力、耐摩擦性等指标的测试与分析,发现大部分性能都与织物的面密度和厚度有一定的关系,而且同等条件下,熔喷非织造布、轻薄型纺黏非织造布和SMS等都各自具有独特的性能,适合开发各类功能性产品,在纺织工业上有广泛的应用。     

Adsorption mechanism of surfactants on nonwoven fabrics

For improved surface properties, nonwoven fabrics of polypropylene and poly(ethylene terephthalate) were treated with several kinds of surfactants, including anionic, cationic, and nonionic types. The adsorption isotherms of the anionic, cationic, and nonionic surfactants on the nonwoven fabrics were different. The adsorption isotherm of the cationic surfactant (dodecyl dimethylbenzyl/ammonium chloride) exhibited a maximum. The adsorption isotherm of the anionic surfactant (sodium dodecylbenzene sulfonate) was in the shape of the fifth Brunauer adsorption isotherm, and that of the nonionic surfactant (alkylphenol/ethylene oxide condensate) was similar to the fourth Brunauer adsorption isotherm. The time of the adsorption equilibrium was constant for the same types of adsorbate and adsorbent, and it was not related to the initial concentration. The specific surface resistance of the nonwoven fabrics decreased substantially after the adsorption of ionic surfactants. The nonwoven fabrics with the surfactants were characterized with scanning electron microscopy and X‐ray photoelectron spectroscopy. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3210–3215, 2003     

新型改性熔喷无纺布润湿性能研究

采用了一种新型工艺的熔喷无纺布,通过新型熔喷无纺布和传统熔喷无纺布的厚度和孔径测试来对比分析比较两种熔喷无纺布的厚度均匀度和孔径大小。同时,由于熔喷无纺布固有的亲水性能差特点,试验又进一步比较了不同质量浓度亲水助剂的情况下,含有PET的新型无纺布和纯PP无纺布的吸水性能以及芯吸性能的比较。结果表明:新型熔喷无纺布的厚度均匀,孔径大,织物更为蓬松。在亲水吸水性能上,样品在低质量浓度助剂的长时间作用下也能达到高质量浓度助剂作用的效果。且新型熔喷无纺布能吸收储存的水量也要比纯PP无纺布要多。在芯吸性能方面,虽然两种无纺布芯吸测试结果最终液面的爬升高度都趋于一致,但结合吸水率和芯吸的现象来看,新型熔喷无纺布的吸水率明显高于纯PP无纺布,且含水更多,也更保水。     

Effect of fiber surface morphology on the hydrophilicity modification of cold plasma‐treated polypropylene nonwoven fabrics

Cold oxygen plasma was employed to give hydrophilicity modification to polypropylene (PP) nonwoven fabric (NWF). It was found that, after plasma treatment, PP NWF made from fibers with smooth surfaces can only keep its hydrophilicity for a short time and then shows a quick hydrophobic recovery at room temperature. However, this hydrophilic property can last for a long time in the case of the PP NWF made from fibers with rough surfaces. To prove the contribution of the rough surface to the long‐term hydrophilicity, this PP NWF was treated in an organic solvent to smooth the fiber surface. The hydrophilic feature of this PP NWF no longer lasts for a long time after the same plasma treatment. This observation strongly supports our opinion that the fiber surface morphology of PP NWF is a critical factor for long‐term hydrophilicity improvement after plasma treatment, which gives a positive solution to overcoming the aging effect of hydrophilicity modification often found in this technique. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Impact of electrospinning process parameters on the measured current and fiber diameter

In this article, polycaprolactone (PCL) nanofibres were processed by electrospinning using a 3:1 ratio of tetrahydrofuran to methanol as solvent. The solvent choice was motivated by the possibility of greener alternatives to the halogenated compounds most often used for electrospinning. The morphologies and fiber diameters resulting from the electrospinning of PCL solutions at room temperature under various conditions are presented in this article. The material morphology was characterized using scanning electron microscopy and a measuring software. The process was optimized for smaller fibers with a narrower fiber diameter distribution by studying parameters such as polymer concentration, applied voltage, the tip to collector distance (TCD), and the solution flow rate. A comparison analysis was used to separate the current resulting from whipping and that resulting from spraying at high voltage. The fiber diameters obtained under various processing conditions were effectively modeled using the terminal jet theory, referenced in several works. Process parameters were optimal for a 20% PCL concentration spun at a flow rate of 0.5 mL/h, with a TCD of 15 cm and an applied voltage of 8 kV. Fibers spun under these conditions displayed diameters of 546 ± 173 nm. POLYM. ENG. SCI., 55:2576–2582, 2015. © 2015 Society of Plastics Engineers     

聚合物熔体在纺黏非织造牵伸器中的气流牵伸模型 与数值模拟研究

介绍了有关纺黏非织造过程建模与数值求解的方法。首先在继承前人研究成果的基础上,给出了纺黏非织造过程理论模型;其次,对实际生产中应用的宽狭缝牵伸器的喷射流场进行数值模拟,求出了气流速度在牵伸器中的数值分布。通过对牵伸器喷射流场的数值模拟,得到了气流速度在流场中的数值分布,从而为聚合物熔体的气流牵伸模型求解提供了有利的条件。本研究也显示了在对纺黏非织造布工艺和设备进行计算机辅助设计方面具有较好的应用前景。     

Grafting of cyclodextrins onto polypropylene nonwoven fabrics for the manufacture of reactive filters. I. Synthesis parameters

A novel method for the preparation of immobilized α‐, β‐, and γ‐cyclodextrins (α‐, β‐, or γ‐CD) on polypropylene (PP) nonwoven fabrics is presented. These new materials were prepared by graft‐polymerization of glycidyl methacrylate (GMA) onto PP filters using the electron‐beam technique, followed by coupling of α‐, β‐, and γ‐CDs with the epoxide group. Optimization of various reaction parameters such as time, temperature, irradiation dose, monomer, and CD concentration was carried out. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2118–2125, 2000     

再生PET瓶片纺黏针刺非织造布生产线设计优化

介绍了再生PET瓶片纺黏针刺非织造布生产线中切片筛选及输送、结晶及干燥、螺杆挤压机、熔体过滤器、纺丝、气流牵伸、摆丝成网、刺针等系统的设计特点。产品品质优于国家标准指标。