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.

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.

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.

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.

三种灭菌包装材料在骨科手术器械包中的应用效果探究

目的:探讨三种灭菌包装材料在骨科手术器械包中的应用效果。方法:将广西中医药大学第一附属医院2022年8月—2023年4月骨科手术器械包分别用普通棉布、一次性无纺布和新型纺织品三种包装材料进行包装灭菌,每种包装材料各300包。比较三种灭菌包装材料湿包发生率、总综合成本。结果:新型纺织品湿包率低于普通棉布及一次性无纺布(P<0.05);普通棉布与一次性无纺布湿包率比较,差异无统计学意义(P>0.05)。普通棉布综合成本为(2615.25±5.18)元,一次性无纺布综合成本为(5530.00±10.26)元,新型纺织品综合成本为(2711.68±6.45)元;其中总综合成本最低的为普通棉布,新型纺织品次之。结论:三种灭菌包装材料中使用普通棉布的湿包率最高,但总综合成本最低(过期后再处理未计成本);一次性无纺布易湿包,且总综合成本最高;新型纺织品湿包率最低,总综合成本相对较低,性价比更高。

A new kind of resin-based wet friction material:Non-woven fabrics with isotropic fiber networks as preforms

As an alternative to short fibers,non-woven fabrics(NWFs)were made using different types of long fibers to optimize the performance of paper-based friction materials and their technology.In this investigation,the fillers and resin were impregnated into these NWFs to prepare three kinds of wet friction material.The tribological,mechanical,and thermal properties of the new wet friction material were studied.The results indicate that the dynamic friction coefficient of the new friction material is approximately 0.12 and the static friction coefficient is approximately 0.15;the better wear rate is 0.81334×10^(-14)m^(3)·(N·m)^(-1).In addition,the temperature for 10%mass loss yielded 100°C enhancement and the tensile strength was improved by 200%,compared to previously reported values.Most importantly,the advantages include a simple preparation flow,low cost,and resource conservation.This is a promising approach for the future development of paper-based friction materials.

一次性无纺布不同包装方式对器械包无菌屏障系统的影响

目的观察一次性无纺布包装器械包破损情况,分析包装破损的原因,通过改进包装方法提高包装完好性。方法选取2017年10月—2018年12月某院5000个相同规格的手术器械包作为研究对象,按照不同的包装形式分为A—E组(A组:普通篮筐+一次性无纺布;B组:普通篮筐+一次性吸水衬纸+一次性无纺布;C组:平底篮筐+一次性无纺布;D组:平底篮筐+一次性吸水衬纸+一次性无纺布;E组:提篮+平底篮筐+一次性吸水衬纸+一次性无纺布),每组数量1000个,观察记录自包装完成至使用前的七个环节(①包装操作完成;②装载至灭菌架;③灭菌后卸载至存储架;④装入运输车;⑤卸载至手术室存储架;⑥使用前放置在操作台;⑦使用前打开)器械包的破损情况。结果A—E组包装破损率分别为21.7%、13.5%、8.8%、5.2%、0.1%,A组破损率最高,E组破损率最低,各组比较,差异均有统计学意义(均P<0.001)。①—⑦转运环节中包装破损率分别为0、0.24%(12件)、1.04%(52件)、1.44%(72件)、3.44%(167件)、0.30%(15件)、0.46%(23件),除环节①包装破损数量为0以外,各个环节均发生了包装破损,环节⑤破损率最高,器械包进入使用科室直至使用前,破损情况均在持续发生。结论与使用普通篮筐比较,使用平底篮筐进行器械包装破损率更低,增加一次性吸水纸的保护可以进一步改善包装破损情况,器械包转运提篮的使用可以有效减少包装在转运、搬运过程中的损伤。

纯棉布和一次性无纺布治疗巾的成本分析对比

目的:通过对纯棉布治疗巾和一次性无纺布治疗巾进行成本分析,选出一种价格合理、成本低、适合于医院临床使用的治疗巾,以降低医院成本,合理利用资源。方法:对单包纯棉布治疗巾和一次性无纺布治疗巾进行成本分析,同时也对我院2017年总使用量为49 185包的纯棉治疗巾和与之数量相同的一次性无纺布治疗巾的成本进行比较和分析。结果:单包一次性无纺布治疗巾的成本比纯棉布治疗巾低2.50元/包,使用一次洗无纺布治疗巾每包可节约成本2.50元。2017年全院共使用纯棉布治疗巾49 185包,成本比一次性无纺布治疗巾高出122 962.50元,使用一次性无纺布治疗巾每年可节约成本122 962.50元。结论:无纺布不落絮、保存时间长、阻菌效果优于纯棉布治疗巾,而且一次性无纺布治疗巾节省材料、清洗、人力成本。使用一次性无纺布治疗巾的成本低于反复使用的纯棉布治疗巾,建议使用一次性无纺布治疗巾。

绿色儿童居室环境的设计

从绿色建材的选用、室内绿色植物的选择、室内织物的选择及家具的良好配置等几个方面探讨了绿色儿童居室环境的设计.

Fabrication of Non-woven Fabric-Based SERS Substrate for Direct Detection of Pesticide Residues in Fruits

In surface-enhanced Raman scattering(SERS),flexible substrate plays an important role in target molecular collection from various shape surfaces and increases the analytical sensitivity.In this study,silver nanoparticles(Ag NPs)were deposited on a non-woven fabric used as an SERS substrate by self-assembly,in situ growing or the self-assembly/in situ growing combination method.4-Aminothiophenol was selected as a model molecular for the evaluation of the SERS performance using the substrates.The Ag NPs substrate prepared by self-assembly/in situ growing method presented the best Raman enhancement effect and its enhancement factor was estimated as high as 3.59106.The substrate was applied to the determination of four pesticide residues on the surfaces of fruit samples through wipe sampling,and the results revealed the good reproducibility of SERS responses and high detection sensitivity.The prepared flexible substrate was simple to fabricate and environmentally friendly.It could be expected to be a useful tool in rapid on-site test of pesticide residues on fruit surfaces because of its high sensitivity,convenience and non-destructive characteristics.

Efficient removal of tetracycline in water by a novel chemical and biological coupled system with non-woven cotton fabric as carrier

As a novel wastewater treatment strategy,the intimate coupling of photocatalysis and biodegradation(ICPB)has been attracted attention,which is ascribed to its combination of the advantages of photocatalytic reactions and biological treatment.The selection of carriers is important since it affects the stability of the system and the removal efficiency of pollutants.In this study,a novel ICPB system was successfully constructed by loading photocatalytic materials(i.e.,TiO_(2),N-TiO_(2),and Ag-TiO_(2))and microbes onto non-woven cotton fabric.The photocatalysts were characterized by scanning electron microscope-energy dispersive spectrometer(SEM-EDS),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).This system exhibited good performance in degrading tetracycline(TC)in water.The results showed that Ag-TiO_(2)-ICPB had the maximum removal efficiency of tetracycline(94.7%)in 5 h,which was 16.5%higher than the photocatalysis alone.After five cycles,82.9%of tetracycline could be still degraded through Ag-TiO_(2)-ICPB.SEM spectrum showed microbes on the material changed little before and after the reactions.This result implied the materials were stable,and then beneficial for degrading of pollutants continuously.The intermediates were detected through ultraperformance liquid chromatography-mass spectrometer(UPLC-MS)and the plausible degradation pathways were proposed.Electron paramagnetic resonance(EPR)analysis showed·OH and O_(2)·-were the main reactive oxygen species for TC degradation.In conclusion,the ICPB system with non-woven cotton fabric as a carrier has certain application prospects for antibiotic-containing wastewater.

Flexible and Reusable Non-woven Fabric Photodetector Based on Polypyrrole/Crystal Violate Lactone for NIR Light Detection and Writing

Rapid NIR light detection and/or writing has drawn much attention,but their practical applications have been limited by obtaining such NIR photodetectors.To address this problem,we have developed a simple and versatile strategy to prepare a non-woven fabric photodetector.The blue non-woven fabric photodetector has been prepared by coating photo-thermochromic ink(including crystal violet lactone(CVL)as the thermo-sensitive dye,polypyrrole(PPy)nanospheres as the photothermal component and hydroxyethyl cellulose(HEC)as the polymer matrix)on white non-woven fabric.When the blue fabric photodetector is irradiated by NIR(808-nm as model,0.75 W cm^(−2))laser,the discoloration occurs in 35 s,and higher laser intensity confers more rapid discoloration.This discoloration results from the photothermal effect of PPy which confers the elevation of temperature(>50℃)and then converts CVL to its leuco form(colorless).When the laser is turned off,the temperature drops to below the transition temperature(<43℃),and then CVL reverts to its initial blue color.Moreover,different figures and images can be easily printed on the fabric photodetector by 808 nm laser,and then they can be erased automatically under ambient conditions,with excellent cycling stability.Therefore,this fabric photodetector may act as a new platform for rapid NIR light detection and writing.

Non-woven cotton fabric based intimately coupling of photocatalysis and biodegradation system for efficient removal of Cu(Ⅱ)complex in water

The efficient remediation of heavy metal complexes in water has become a difficult and challenging task owing to their high stability and strong mobility.In this study,a novel strategy was employed for highly efficient removal of Cu-citrate by using intimately coupled photocatalysis and biodegradation(ICPB)system with non-woven cotton fabric as a carrier.Experimental results showed that the ICPB system caused94%Cu removal,which was higher than those of single photocatalysis.After 5 cycles,Cu removal efficiency could still reach 78%within 5 h.The existence of 0–40 mg/L citrate had negligible influence,whereas the presence of 60–100 mg/L citrate exhibited a limited adverse effect on Cu removal(~70%).The decomplexation of Cu-citrate was realized via the function of free radicals and microorganisms.Two main processes,such as bio-adsorption of Cu^(2+) by microorganisms,deposition of Cu^(0) on the surface of material,played important role in Cu removal from aqueous solution.The dominant microorganisms in the system were Proteobacteria,Actinobacteria,Bacteroidetes,Chloroflexi,Chlorophyta,Planctomycetes,and Verrucomicrobia.Furthermore,the performance of ICPB system was also validated through treatment of other heavy metal complexes.This study provided a feasible strategy for the decontamination of heavy metal complexes in wastewater.

基层医院供应室医用无纺布与全棉布包装的应用对比分析

目的观察一次性医用无纺布与棉布包装材料的无菌包阻菌效果,分析一次性医用无纺布与棉布包装材料成本费用,在确保质量的情况下,为医院节约成本。方法比较传统棉布类包装和一次性无纺布包装的成本费用,通过储存过程中无菌包检验,对两种包装材料制作的灭菌包进行了评估。结果一次性无纺布包装成本明显低,灭菌后有效期延长,减少了无菌包重新包装、灭菌的频次和费用,减轻了供应室护士的工作量,降低了器械的损耗。结论供应室使用一次性无纺布包装灭菌成本明显低于棉布包装,节约了临床使用成本。

工业用一次性防护服设计的现状及解决方案

探索了现有的工业用一次性防护服设计的优缺点,并对欧盟标准的防护服设计要求进行了解读,从款式及面料设计方面给出了针对现有设计问题的解决方案。

INTROMISSION OF WATER-REPELLENT AND HYDROSCOPIC PROPERTIES SIMULTANEOUSLY TO PP BY PLASMA DISCHARGE METHOD

Plasma-induced surface graft copolymerization of acrylic acid on polypropylene non-woven fabric(PP-g-AA)andpolypropylene membrane were reported.The extents of grafting were controlled by the plasma and polymerizationcondition.Hexadecyltrimethyl ammonium bromide was then coupled with the carboxyl group of PP-g-AA to obtain apolyion complex(PIC).At last,CF_4 plasma was used to give PICs hydrophobic property.The moisture regain and water-repellency of the processed PICs was investigated.The surfaces were characterized using ATR FT-IR and XPS.The resultindicates that the products have very high ability to adsorb moisture,even better than cotton fiber.At the same time,theproducts show excellent hydrophobic property,which can't be wetted by those reagents whose surface tensions were higherthan 327 mN/m.