纺黏/熔喷SMMS组合型非织造布性能的测试与分析

测试了SS、SMS、SMMS复合型非织造布材料的性能和特点,分析比较了不同克重试样的断裂强力、断裂伸长率、透气量、透湿量、柔软度、渗水性等,实验发现SS、SMS、SMMS复合型非织造布材料的断裂强力、断裂伸长率,透气量、透湿量、柔软度、渗水性等均与克重和厚度有一定关系,得出SS、SMS、SMMS复合型非织造布具有独特的性能,适合开发各类功能性产品,在纺织工业上有广泛的应用,实验结果为进一步开发产品提供一定的参考依据。

医用SMMS和木浆非织造布的拒水拒油整理

采用乳液聚合制备了含氟整理剂,通过轧烘焙工艺对丙纶复合非织造布SMMS和木浆非织造布进行了整理,研究了整理剂用量、焙烘时间和焙烘温度对整理效果的影响.结果表明:当整理剂用量为20 g/L,120℃焙烘90 s时,SMMS非织造布拒水等级为10级,拒油等级为8级.当整理剂用量为20 g/L,110℃焙烘100 s时,木浆非织造布拒水等级为10级,拒油等级为8级.非织造布具有良好的抗酒精性能、抗血液渗透、透气性、断裂强力及耐静水压性能,能满足医用要求.

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.

氟素整理剂在SMMS非织造布后整理中的应用

采用新型氟素整理剂PM-3622通过浸轧焙工艺对SMMS非织造布进行功能后整理。探讨了整理剂用量、焙烘温度和焙烘时间对整理效果的影响。结果表明,当整理剂PM-3622用量为60 g/L,焙烘温度为130℃,焙烘时间为3 min时,经后整理的SMMS非织造布接触角达到124.3°,耐静水压达到33.9 kPa,断裂强力和沾水等级升高,断裂伸长率、透气量均有不同程度的下降,升降程度与整理剂用量、焙烘温度和焙烘时间有一定关系。

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.

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.

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.

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.

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.