Comparative Study of Polypropylene Non-Woven Surgical Mask and Locally Manufactured Woven and Knitted Fabrics Facial Masks

The outbreak of coronavirus has led to an increase in the demand for facemasks globally. Unavailability of appropriate polypropylene non-woven fabrics face masks as a result of inadequate supply to satisfy the growing population has brought about the manufacturing of locally fabrics masks to augment or substitute standard medical class facemasks. The study aims at analyzing airflow of these locally manufactured fabrics to determine possible means of transmitting the virus as well as establish comfort of the user of these masks. Standard polypropylene non-woven, woven and knitted fabrics were considered for the study. Air permeability test was conducted on these fabrics using Frazier Air permeability tester. Depending on the property significant variation in the textile fabrics, polypropylene non-woven is widely accepted for facial masks. Nevertheless, this study illustrates that woven and knitted fabrics have more open structures, which allow a high rate of air penetration and so may require two or three layers to prevent antimicrobial or antiviral potential.

A Cell-Based Smoothed Finite Element Method for Modal Analysis of Non-Woven Fabrics

The combination of a 4-node quadrilateral mixed interpolation of tensorial components element(MITC4)and the cell-based smoothed finite element method(CSFEM)was formulated and implemented in this work for the analysis of free vibration and unidirectional buckling of shell structures.This formulation was applied to numerous numerical examples of non-woven fabrics.As CSFEM schemes do not require coordinate transformation,spurious modes and numerical instabilities are prevented using bilinear quadrilateral element subdivided into two,three and four smoothing cells.An improvement of the original CSFEM formulation was made regarding the calculation of outward unit normal vectors,which allowed to remove the integral operator in the strain smoothing operation.This procedure conducted both to the simplification of the developed formulation and the reduction of computational cost.A wide range of values for the thickness-to-length ratio and edge boundary conditions were analysed.The developed numerical model proved to overcome the shear locking phenomenon with success,revealing both reduced implementation effort and computational cost in comparison to the conventional FEM approach.The cell-based strain smoothing technique used in this work yields accurate results and generally attains higher convergence rate in energy at low computational cost.

Preparation of UV-curable Nano-silver Antimicrobial Agent and Its Application in Non-woven Fabric

Nano-silver and waterborne polyurethane(WPU)composite emulsion was synthesized.The average diameter of silver nanoparticles(SNPs)was about 20 nm,and the average diameter of WPU was 101.32 nm.The anti-bacteria finishing of a polypropylene non-woven fabric(NWF)was carried out by ultraviolet finishing technology and the double dipping twin-roll method.The standard AATCC100 was used to test the antimicrobial activity of the samples.The results showed that the antimicrobial rates of Klebsiella pneumoniae(K.pneumoniae)and Staphylococcus aureus(S.aureus)were above 90%,which indicated that the NWF finishing had good antimicrobial activity.In addition,the thermal stability,mechanical properties,whiteness and contact angle of antimicrobial finishing nonwovens were characterized.The results showed that the performance of antimicrobial nonwovens was stable at 300℃.The breaking strength was better than that of untreated nonwovens,and the contact angle reached 119.1°.

Beijing Dayuan Non-woven Fabric Co.Ltd

Situated in the Shilong Industrial District of Mentougou, Beijing, the Beijing Dayuan Non-woven Fabric Co. Ltd is a Sino-foreign joint venture producing non-woven fabrics, set up in 1991.

Film Morphology,Emulsification of Dodecyl/Carboxyl Modified Polysiloxane and Its Application Performance on Cotton Fabrics

The film morphology of dodecyl/carboxyl modified polysiloxane(RCAS) on cotton fabric or the silicon wafer was investigated and characterized by field emission scanning electron microscopy(FESEM),atomic force microscope(AFM),and Fourier transform infrared spectrometer(FTIR).Experimental results indicate that RCAS is a good film forming material on different substrates.Relatively smooth film was formed on cotton fabric surface,on which the grooves disappeared.In addition,RCAS formed a micromorphology inhomogeneous and unsmooth film on the silicon wafer.Many high or low bright peaks distributed randomly on the film surface,especially as the field was 2μm×2 μm and the date scale was 5 nm in AFM observation.Then RCAS was emulsified with nonionic surfactant alkyl polyoxyethylene ether in order to achieve a transparent organosilicon emulsion-RCAS emulsion(RCSE),which possessed good stability.The properties of RCSE and its application performance on cotton fabrics were investigated and characterized by transmission electron microscope(TEM),particle size analysis,and voltage test instrument.The results show that the average particle size of RCAS emulsion is 28.32 nm,while the ζ voltage is-37.88 mV.Compared with untreatd cotton fabric,the softness of treated fabric can be improved with RCSE to a certain extent.At the same time,the fabric treated with RCSE acquires unique fluffy and soft handle.

A STUDY OF THE SPECIMEN SIZE OF STRIP TENSILE TEST FOR NEEDLE-PUNCHED NON-WOVEN GEOTEXTILES

In this paper,the failure features of strip tensile specimen were observed and analysed for need-le-punched non-woven geotextiles.A mechanical model which expresses the relation between thetensile modulus,the strip specimen size,contraction factor and the tensile strength of non-wovenfabric was derived.The theoretical prediction showed that the main factor influencing tensilestrength of non-woven geotextile specimens with different size is the contraction factor of specimenor the specimen aspect ratio(width/length).The larger the aspect ratio,the higher the tensilestrength test value of geotextiles,but the experiments showed that the specimen tensile strength isnot increased with increasing the width of specimen.The reason was discussed and it seemed thatthe deviation could be served as an indication of the degree of imperfectness of the non-wovenstructure.

Relationships between the Processing Parameters of Melt Blown Nonwoven Fabric and Its Structure and Filtration Property

Based on the processing experiment and sodium flame test this paper deals with the relationship between processing parameters, structure, and filtration property of melt blown fabric. Through the image analysis of Questar micro-images in combination with the SEM observation and the measurement of some macrostructure indices, the relationship between the processing parameters and the structure especially the microstructure is emphasized Finally the effect of somestructure factors on filtration properties is discussed theoretically.

Fabric Structure for Moisture Retention Property and Its Application in Civil Engineering

The article reveals the development and analysis of fabric structure for its moisture absorbency property and its application in Civil engineering for curing of concrete. The presence of moisture in concrete and time of curing are the major influencing factors for concrete strength. Normal practice of curing is to wrap the concrete with jute woven fabric and spraying of water. The absorbency characteristics of different GSM (Gram per square meter) of woven and Non-woven fabric were studied. The Non-woven fabric absorbency is superior to woven fabric of same GSM by its three dimensional structure and high pore volume. The strength of concrete cured with Non- woven fabric is 2.1 N/mm2 higher than woven fabric of same 350 GSM. The difference in compressive strength of Non-woven fabric of 350 GSM and 750 GSM is 0.06 N/mm2 which is marginal.

Cost analysis and comparison of plain cotton and disposable non-woven treatment towels

Objective: To choose a reasonably priced and low-cost treatment towel suitable for clinical application of hospital so as to reduce the cost of the hospital and make a reasonable use of resources through the cost analysis and comparison of the plain cotton and disposable non-woven treatment towels. Methods: The cost of the single pack plain cotton towel and disposable non-woven towel were analyzed and at the same time, 49185 packs of plain cotton towels which were the total consumption quantity of our hospital in 2017 and the same quantity of disposable non-woven towers were analyzed in the cost for comparison. Results:A single pack of disposable non-woven towel was RMB 2.50 cheaper than the plain cotton towel and the use of disposable non-woven towel can save the cost of RMB 2.50 per pack. In 2017, 49185 packs of plain cotton towel were used in total, which cost RMB 122962.50 less than the same quantity of disposable non-woven towels and using the disposable non-woven towel could save RMB 122962.50 annually. Conclusion: Compared with the plain cotton towel, the non-woven shares the advantages of none flocculation, longer storage time and better antibacterial effect as well as the material, cleaning and labor costs-saving. The cost of the disposable non-woven treatment towel is lower than that of the reusable plain cotton towel. Therefore, it is recommended to use the disposable non-woven treatment towel.

纺织用X射线防护材料的研究进展

针对纺织用X射线防护材料的应用需求,概述了现有X射线防护粉体、纤维和织物的研究进展,对比了含铅与无铅防护粉体的优缺点,归纳了X射线防护纤维的研究现状,分析了使用纤维加工和后整理法开发X射线防护织物存在的问题,并展望了纺织用X射线防护材料的发展前景。认为:未来X射线防护材料将向着高性能、多功能、轻量化、柔性化的方向发展。

氨纶预牵伸倍数对棉/氨纶/不锈钢丝包覆纱性能的影响

针对面向个体防护装备的涂层类电磁屏蔽材料存在无弹性、保形性差、不耐洗涤、舒适性差等不足,基于空心锭包缠纺纱机,以氨纶为纱芯、不锈钢丝和棉股线为第一和第二外包覆层,纺制兼具优良弹性和电磁屏蔽功效的棉/氨纶/不锈钢丝包覆纱。探究氨纶预牵伸倍数对包覆纱强伸性能、回弹性能的影响,利用模糊综合评判法优化工艺参数,实现纬向弹性电磁屏蔽机织物的设计构筑。结果表明:氨纶预牵伸倍数对包覆纱性能影响显著。在设定范围内,氨纶预牵伸倍数为2.5时,包覆纱综合质量较优,且在拉伸应变下具有稳健的导电特征。此外,基于包覆纱制备的纬向弹性机织物具有优良的可拉伸性,电磁屏蔽效能与织物放置方向、拉伸应变程度等密切相关。相关研究结果可为开发电磁屏蔽耐久性好、高度可拉伸且服用性能优良的电磁屏蔽织物提供新思路。

化纤织物疏水疏油功能整理的发展概况

早期荷叶表面的拒水现象引起了人们极大的兴趣,研究人员基于荷叶效应不断模仿荷叶表面的微纳结构,以获得可以比拟荷叶的超疏水表面。将超疏水表面应用于化纤织物有着巨大的应用前景,基于荷叶效应,可以通过构筑粗糙纹理表面的方法制备超疏水表面,但有些液体悬浮在纹理表面的稳定性较差,因此适用性有限。通过化学方法合成的含氟整理剂能够降低材料的表面能,使材料对大部分表面能较高的液体具有抵抗作用,使用含氟整理剂整理是目前制备超疏水表面的主流方法。但不论是构筑粗糙表面还是使用含氟整理剂整理,都无法使超疏水表面在极端环境下保持较好的拒液效果。通过在材料表面构建自愈合体系可以获得具有长久拒液效果的自愈合材料,这种超疏水材料的表面在受到机械磨损或化学腐蚀时,受损部位会自愈,从而达到持续的拒液效果。本文主要以化纤织物为例综述了疏水疏油功能整理的方法,阐释了化纤织物的疏水疏油机理,探讨了化纤织物受到化学腐蚀、机械磨损时应如何保持拒液稳定性的问题,并对未来化纤织物疏水疏油功能整理的发展方向进行了展望。

含氟织物整理剂的发展概况及展望

综述了含氟织物整理剂的功能、发展简史、品种、特殊结构特点。包括含氟单体和非氟共聚单体的种类及作用,并展望含氟织物整理剂的发展方向,提出多功能化、低温干燥化、通用化以及与其它材料拼合应用的研究方向。

集装箱建筑发展历史及应用概述

工业化装配式建造是我国建筑业转型与升级的发展方向。与其他建筑形式相比,集装箱建筑是一种预制装配化程度较高的工业化建筑。回顾了集装箱建筑的发展历史及其在我国的发展现状,归纳了集装箱建筑的诸多优点,阐述了集装箱建筑的技术要点,总结了集装箱建筑的各种用途,并介绍了近年来集装箱建筑在我国的应用情况,指出集装箱建筑符合我国建筑业的发展需求,在我国具有广阔的发展前景。

含氟聚丙烯酸酯乳液整理剂的性能及其应用

为了探讨含氟聚合物在亚麻织物上的应用效果,以甲基丙烯酸十二氟庚酯(G04)为改性单体,丙烯酸正丁酯(BA)、甲基丙烯酸甲酯(MMA)为软、硬单体,丙烯酸(AA)为功能单体,采用半连续种子乳液聚合制备氟改性的丙烯酸酯共聚物乳液,并将其用于整理亚麻织物。利用红外光谱仪、透射电子显微镜、粒径分析仪、接触角测量仪等对产物结构与性能进行表征与分析,探讨经其整理后亚麻织物透湿透气性及断裂强力的变化。结果表明:所得含氟共聚乳液胶粒呈核壳结构,其粒径属于纳米级;经其整理的亚麻织物对水接触角可达130°,且织物断裂强力有所增加,透湿透气性略有降低。

无纺布容器规格与基质对云南松苗木生长的影响

以苗龄约160d的云南松苗木为试材,采用L9（34）正交设计开展无纺布容器规格、基质和追肥3因素3水平的苗木培育试验,于苗龄190d和250d时测定地径和苗高,分析了试验因素的水平及其组合对苗木生长的影响。结果表明：苗龄190d和250d时,苗木的平均地径和苗高分别为1.19~1.72、1.89~2.32mm和1.36~3.40、3.11~4.09cm,2个苗龄的不同处理组合间地径和苗高均呈现极显著差异（P〈0.01）。容器规格、基质配比和根博士浓度对2个苗龄阶段的地径、苗高均有极显著影响（P〈0.01）,云南松苗木生长对空间和养分具有动态的变化需求;6份森林土与3份碳渣和1份珍珠岩混合为基质有利于云南松苗木生长。苗高与地径具有y=1.232 2x＋0.801 3的一元线性相关。

含氢聚甲基硅氧烷/聚丙烯酸酯复合乳液研究 Ⅰ.复合乳液的制备及其性能

合成了含氢聚甲基硅氧烷／聚（丙烯酸丁酯－羟甲基丙烯酰胺）复合聚合物乳液。探讨了引发剂用量、反应温度、聚合方法、含氢聚甲基硅氧烷及羟甲基丙烯酰胺含量对聚合反应转化率，聚合及存放稳定性的影响。考察了复合乳液的成膜性及胶膜性质。柔软性能测试表明，所制备的复合乳液可作为织物柔软剂使用。

纳米TiO2/有机硅改性聚丙烯酸酯乳液的合成及其对亚麻织物的整理

采用半连续种子乳液聚合法,以丙烯酸甲酯(MA)和丙烯酸乙酯(EA)为聚合单体,以无机纳米TiO2和乙烯基三甲氧基硅烷(A-171)为功能单体,制备出含有纳米TiO2/有机硅的改性聚丙烯酸酯乳液织物整理剂,并将其应用于亚麻织物。探究乳化剂用量、引发剂用量以及功能单体用量对合成反应的影响,测试复合乳液粒径分布及大小、热稳定性能、抗紫外线性能、弯曲刚性以及动、静摩擦性能等。结果表明:最佳制备条件为有机硅用量3.5%,纳米TiO2用量1.0%,乳化剂用量6.5%,引发剂用量1.2%,反应温度80℃。纳米TiO2的加入使得复合乳液整理的亚麻织物的抗紫外线性能明显提升,防护系数达到65.4;有机硅的引入使亚麻织物的弯曲刚性从5.2 cN/mm下降到3.55 cN/mm,赋予亚麻织物良好的柔软性能。

无纺布容器规格对大叶相思苗木生长及生物量的影响试验

针对干热河谷地区特殊地理环境,采用无纺布容器,以塑料容器为对照,研究不同材质及规格的容器对大叶相思苗木生长和生物量的影响.结果表明,无纺布容器及规格对大叶相思苗木的高、地径生长量,Ⅰ级侧根条数,苗木总生物量,根生物量有显著的影响;对大叶相思苗木质量进行综合评价.结果表明,大叶相思苗木培育的最佳容器为无纺布8 cm直径容器,其次是无纺布6 cm直径容器.

含氟聚丙烯酸酯乳液合成及应用

以丙烯酸和烷基醇为原料,合成含不同碳链长度的烷基丙烯酸酯软单体,再以含氟丙烯酸酯功能单体和丙烯酸酯软单体为原料进行乳液聚合,得到了稳定性良好的含氟聚丙烯酸酯乳液.研究了含氟聚丙烯酸酯乳液在织物上的应用.采用二浸二轧、110℃预烘1 min、170℃焙烘3 min的整理工艺,整理后棉织物拒水达3~4级,拒油达2级,接触角可达130.4°.