非织造布购物袋热黏合接缝强力的测试方法探讨

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。     

试验条件对针刺非织造布拉伸性能的影响

非织造布拉伸试验中试验条件对测试结果有很大的影响。对试样宽度、长度、长宽比和拉伸速率等因素进行了拉伸正交试验。结果表明:试样宽度对拉伸断裂强力的影响最大,达到显著影响的程度;其次为拉伸速率,拉伸速率太小使断裂强力偏低;长宽比和长度的影响不大。     

不同宽度非织造布试样力学性能研究

分析了对不同宽度的热轧,针刺非织造布试样的断裂强力进行的一系列试验研究,并就非织造布力学性能测试试验中所采用的拉伸试样宽度提出了相关建议。     

哑铃形试样在非织造布拉伸性能测试中的应用研究

为减少非织造布拉伸试验中"颈缩"现象对测试结果的影响,采用哑铃形试样对国标规定的窄条样进行形状修正。通过哑铃形试样形状因素的正交试验分析发现,影响哑铃形试样断裂强力的最主要因素是平行宽度;通过全因素试验分析发现,哑铃形试样对窄条样的拉伸断裂强力和断裂位置有较好修正效果,并得到标准窄条样的最佳修正形状。     

不同测试方法下聚丙烯纺黏无纺布拉伸性能对比

拉伸断裂强力是无纺布重要的物理性能,拉伸断裂强力和延伸率直接影响无纺布的尺寸稳定性和应用范围。目前,不同的纸尿裤公司针对拉伸断裂强力均有自己的测试方法,测试方法繁多不统一,文章根据拉伸断裂强力测试中的部分关键因素通过控制变量法进行研究,最终得到不同的拉伸速率、不同的试样宽度对测试结果的影响。     

建筑用针刺非织造布保温材料的性能研究

为探究建筑用针刺非织造布保温材料的保温性和阻燃性,以再生棉纤维和阻燃涤纶纤维为原料,采用非织造针刺工艺,制备7组不同比例的非织造布保温材料。其中,对100%再生棉纤维试样进行阻燃整理剂后整理,并测试7组试样的透气性、保温性和阻燃性。结果表明,经过阻燃后整理的试样,透气性减小,拉伸强力减小,保温性降低,阻燃性能最好;混合阻燃纤维的试样,随着阻燃纤维含量的增加,透气性有所提高,拉伸断裂强力增加,保温性能略有提高。当阻燃纤维含量为55%～70%时,阻燃性能随着阻燃纤维含量的增加而增加;当阻燃纤维含量为70%～80%时,阻燃效果趋于稳定。     

汽车顶棚材料的各向异性研究

以涤纶针刺非织造布汽车顶棚内饰材料为研究对象,着重分析不同方向上的断裂强力、断裂伸长、断裂后试样宽度、折皱回复角、松弛(强力减小率)和疲劳(断裂强力减小率)等指标的变化规律和形成原因,发现非织造布汽车顶棚内饰材料存在较明显的各向异性。面密度及加工工艺对产品各向异性影响较大。断裂强力随着取样角度的增大而减小,当减小到与纵向呈45°时,变化趋势减缓。断裂伸长、疲劳和松弛性能随取样角度的增大而增大。拉伸断裂后试样的宽度、折皱回复角随着取样角度的增大而减小。     

黏合剂涂层对水刺非织造布结构及力学性能的影响

通过性能测试,研究了不同黏合剂涂层量对水刺非织造布的表观结构、孔径分布、厚度、透气性以及力学性能等方面的影响。结果表明,随着水刺非织造布上黏合剂涂层量的增加,非织造布的纤维缠结趋于紧密,孔径变小且分布均匀,拉伸强力提高,伸长率降低;当涂层水刺非织造布中黏合剂的质量分数在10%～20%之间时,非织造布的孔径分布最均匀,厚度较小,透气性较大;当涂层水刺非织造布中黏合剂的质量分数在20%～40%之间时,非织造布的拉伸强力和伸长率最佳。     

非织造布环保购物袋的性能测试与应用分析

介绍了目前国内一些购物广场在推广使用的非织造布环保购物袋的情况。重点对非织造布环保购物袋所用非织造布进行了多项物理性能指标的测试分析,给出了生产购物袋的非织造布的适用值指标范围。环保购物袋降低了普通塑料袋带来的白色污染,可以增强人们的环保意识。     

客运专线CA砂浆灌注袋用非织造布力学性能检测方法研究

对客运专线CRTSⅠ型板式无砟轨道水泥乳化沥青砂浆(CA砂浆)用灌注袋检测方法进行了初步研究。主要探讨了断裂强力与断脱强力的关系,分析了检测条件对断裂强力、断裂伸长率和撕破强力等指标测试结果的影响。结果表明,灌注袋用非织造布的断裂强力、断裂伸长率和撕破强力测试条件均以拉伸速率100 mm/min、夹具间距100 mm为宜。     

Measuring the strength of knotted suture materials

There is no international standard method for measuring the strength of knotted suture materials, and although several methods have been published, there has been minimal investigation on the effects of test variables on measured properties (e.g. speed, gauge length, and knot tensioning force). Methods investigated in this work were the “ear method” (with and without a rod inside the loop), and the “cut-loop and ear method”. The test environment, material, and type of knot were constant. Effects of varying gauge length, test speed, and knot-tensioning force on tenacity and strain were investigated and compared with data for nonknotted sutures. Different values of tenacity and strain were evident for the different test methods; lower values of tenacity for specimens with shorter gauge lengths and tested at greater speeds; lower values of strain for specimens with longer gauge lengths and tested at greater speeds. Thus, tensile properties of suture materials tested at one gauge length or one test speed, as widely reported in the literature, may be misleading. Knot tensioning force neither affect tenacity nor strain.     

集聚纱与非集聚纱的轴向应变及其对纱线拉伸性能的影响

通过试验重点研究了轴向应变对集聚纱拉伸性能的影响。拉伸性能主要涉及断裂强度、断裂伸长和断裂功。选择不同的应变速率和纱线夹持长度,对9.7 tex集聚纱和非集聚纱进行拉伸测试,然后根据Meredith试验过程绘制不同应变速率和夹持长度条件下各自的负荷-伸长曲线,同时测量各曲线三个区域的斜率。测试结果表明：两种9.7 tex的纱线（集聚纱和非集聚纱）随着应变速率的增加,断裂强度均增加,但当断裂伸长增加到一定程度,且在较高应变速率下,断裂强度有所下降;两种纱线随着夹持长度的增加,断裂强度和断裂伸长均降低;两种纱线的斜率随着应变速率的增加均增加,但随着夹持长度的增加而下降。试验还发现,非集聚纱的斜率变化较大,而集聚纱的斜率变化较小。     

Microstructural Study,Tensile Properties,and Scanning Electron Microscopy Fractography Failure Analysis of Various Agricultural Residue Fibers

This paper presents an approach to examine the microstructural properties and mechanical behavior of coconut husks, banana pseudo-stem, pineapple leaf, and sugarcane bagasse fibers by scanning electron microscope and mini-tensile tester, respectively. Single fiber bundles were examined by using scanning electron microscope. Tensile tests were performed at different diameters (0.15–0.55 mm) and gauge lengths (10, 15, 20, and 30 mm/min) to assess the effects of diameter and gauge length on tensile properties. It was found that fibers consisted of different types of regularly arranged cells. The tensile strength (310 MPa) and Young’s modulus (7.4 GPa) of pineapple leaf fiber bundles showed the highest value compared to the other fibers. The tensile strength and Young’s modulus decreased with the increase of diameter and gauge length of fiber bundles. Scanning electron microscopic fractography analysis showed comparatively heterogeneous ruptures associated with more participants of microfibrils for pineapple leaf and banana pseudo-stem fibers compared to coconut husk and sugarcane bagasse fibers. These fractographic observations were discussed in the light of current knowledge of the microstructure of each fiber and the corresponding mechanical properties.     

锦纶基金属镀膜纤维拉伸性能测试分析

对比分析了锦纶基及其金属镀膜纤维的拉伸性能,通过测试不同速度下两者的拉伸性能曲线,得到了锦纶基及其金属镀膜纤维的拉伸性能特征,并时结果进行了讨论。     

开孔三维机织复合材料的拉伸性能

为研究开孔尺寸对三维机织复合材料拉伸力学行为、破坏模式以及失效机制的影响规律,设计了3种不同孔径的三维机织复合材料试样,利用非接触全场应变测试系统和显微图像技术进行表征。结果表明:6、10、14 mm 的孔径对三维机织复合材料的拉伸模量几乎没有影响,开孔后全截面拉伸强度分别下降35.6％、44.5％和51.8％,但开孔后的净截面拉伸强度基本相同,与未开孔试样相比,平均拉伸强度下降约22.4％;未开孔试样的全场应变呈现均匀分布,而开孔试样在孔左右两侧呈现出应变集中;开孔试样的断口形貌相似,主要表现为经纱的断裂,并伴随有部分纱线的抽拔以及层间开裂。     

经编提花间隔汽车座椅套的接缝性能

为研究汽车座椅面料在使用过程中的接缝强力,首先根据花型各自不同特点选取了基本组织和提花组织两类共12种样品,使用针织面料生产中常用的4种接缝线迹进行试样加工,然后采用条样法分别对经纬二个方向进行接缝强力及织物自身强力的拉伸断裂测试。对试验结果进行处理分析得到了可最大程度发挥经编提花间隔织物强力优势的缝迹,并总结不同花型结构对经纬向接缝强力的影响,以期对经编提花间隔汽车座椅面料的花型设计提供参考。     

亚麻/聚丙烯针织结构预制件及其力学性能

为探讨制备环保型民用纺织复合材料的新途径,利用横机开发了以亚麻为增韧纤维,聚丙烯为基体的亚麻/聚丙烯针织结构复合材料预制件小样,并对其拉伸、弹性回复和顶破强力等力学性能进行测试,分析影响其力学性能的有关因素。研究表明:亚麻纱与聚丙烯长丝合股可有效改善其可编织性;亚麻与聚丙烯纤维体积分数比为50∶50的针织结构预制件的拉伸断裂性能、弹性回复性能及顶破强力都较优;四平结构预制件的拉伸断裂性能、顶破强力优于罗纹结构,而罗纹结构预制件的弹性回复性能优于四平结构;弯纱深度较小时,亚麻/聚丙烯针织结构预制件的力学性能较好。     

STRESS RELAXATION AND TENSILE STRENGTH TESTING OF A PROCESSED FISH PRODUCT

Minced silvercarp was prepared as cooked loaves containing only various added salts. The loaves were then subjected to stress-relaxation and tensile strength tests. The various treatments gave different compression forces, relaxation T_50% values and tensile strengths. The compression force measurements were closely correlated with tensile strength values. Both compression force and tensile strength might be related to the binding quality (cohesiveness) of the loaves. The relaxation T_50% values were not closely correlated with the compression forces nor the tensile strengths, and might be related to the product's viscoelastic properties. Different percent deformation did not have a significant effect on the relative order of the compression force values, but did affect the relaxation T_50% values, with larger differences between samples at 25% deformation.     

Influence of some sewing parameters upon the sewing efficiency of denim fabrics

This paper reports an experimental investigation of the effect of the seam threads linear density, the stitch density and some fabric properties on the seam efficiency. Furthermore, on the basis of the seam quality parameters, regression models were determined in order to predict seam efficiency. In this work, 18 denim fabrics, having different compositions and masses, were sewn with two commercial sewing threads. Their performances, ranked according to the seam quality, were also determined. The seam efficiency was calculated by determining of the seam tensile strength and the fabric tensile strength. It was concluded that the increase in the seam thread linear density increases the seam efficiency, as well as the stitch density. However, the fabric mass has a random effect on seam efficiency. About the composition, we conclude that the seam efficiency decreases with polyester but increases with elastane. According to the seam direction, it was found that, in the weft direction, the seam efficiency was more important than in the warp direction.