基于睡眠健康的化纤枕芯填充材料性能研究

为对比各类化学纤维枕芯的睡眠舒适性,选取涤纶、羽绒棉、丙纶、白竹炭纤维和合金锗纤维5类填充纤维,制成枕芯小样,分别测试其透气性、透湿性、静态热性能、硬挺度和压缩性.通过各项性能数据的对比,获得各类枕芯在睡眠健康及舒适性上的优劣.结果 表明,枕芯的透气性主要由填充纤维间空隙大小决定,涤纶枕芯透气性最好;纤维自身的吸湿性会...     

纤维轴向压缩性能测试及其刺痒感属性判断

为探讨纤维材料的轴向压缩性能及其刺痒感属性,改进了测试装置与测试方法,对测试过程中纤维试样与测试头接触条件的转变及对应压缩曲线特征进行分析,提出了应用纤维轴向压缩性能判断其刺痒感属性的方法。结果表明:在进行纤维材料轴向压缩测试时,试样与测试头的接触条件会发生由"点接触"向"线接触"的转变,压缩性能测试应以"点接触"的结束为终结点;以纤维轴向压缩性能为依据判断其刺痒感属性时,纤维端与皮肤的接触条件应为"点接触",且应具有不少于0.2 mm的长度,并能承受不少于0.75 m N的轴向载荷。     

EKS—F与FAST评价系统力学性能的对比研究

采用KES－F系统与FAST 系统对15种 涤纶织物的压缩、拉伸变形及剪切性能进行了对比测试和分析,结果表明：虽然两种评价系统在测试原理上存在较大差异,但是两者之间存在着高度相关性,文中还尝试推导了两种评价系统的关系方程。     

纺织品厚度及压缩回复性能测试仪的研发

对纺织品厚度及压缩回复性能的测试现状进行了介绍,指出厚度测试存在量程和精确度不足的缺点,压缩回复性能测试则受操作者影响较大,重现性差。通过开发基于Labview编程设计的测试仪专用计算机软件,研发出了纺织品压缩回复性能测试仪,其具有通用的仪器平台,配置了多种系列的压脚,满足多指标(厚度、压缩回复性能)、多标准、多产品的测试,真正实现了一机多用,且自动化程度高,数据结果可靠性佳。     

床垫材料支撑性能评价

床垫与人体的接触状态及支撑效果,会影响人体感知舒适性并进一步影响睡眠质量,对长期卧床的患者更可能是引起压疮的直接原因。对床垫材料的支撑性能的评价至关重要。选择6种典型的床垫材料,对它们进行了厚度压缩测试和床垫与人体接触体压分布测试。通过压强、压缩厚度曲线,结合床垫的人体体压分布测试结果,实现对人体与床垫接触压陷深度的预测,进而综合评价床垫材料的支撑效果。     

生活用絮用纤维填充物蓬松度及压缩回弹性能测试的探讨

对生活用絮用纤维的蓬松度及压缩回弹性能的指标及测试进行了总结,并指出了测试过程中需要注意的一些事项,有助于更加规范地进行方法测试。提出生活用絮用纤维蓬松度及压缩回弹性能测试方法大致可归纳为两种,建议FZ/T64006—2015 《复合保温材料毛复合絮片》和FZ/T 64020—2011 《化纤复合絮片》后期标准更新时能够将方法统一。     

基于KES的服装面料性能关系与预测研究

通过面料的物理性能测试及对人体的压力试验,对测试数据进行相关分析,得出面料物理性能参数与面料对人体的压力间的相关性:面料的拉伸性能及拉伸所需的载荷、面料的压缩性能、面料的表面摩擦性能,都与面料对人体的压力具有较强的相关性及统计学意义。依据这种特殊的相关性,建立了有关的数学方程,从而可依据面料物理性能的测试数据,直接计算、预测面料对人体的压力。     

EPE缓冲材料的静态压缩性能试验研究

目的:研究聚乙烯发泡结构材料的静态压缩性能,为缓冲包装设计提供数据支持。方法:选用EPE缓冲材料,依据《包装用缓冲材料静态压缩试验方法》对EPE的缓冲性能进行测试,对比分析EPE缓冲包装材料的压缩形变性能、载荷—位移曲线试验数据。结果:EPE发泡结构材料,回复能力较强,回复率均达到80%以上,能够适应多次压缩。EPE载荷—位移曲线存在两个明显的变形区域,一是厚度压缩率为0%-75%之间,载荷变化范围较窄,位移量变化较大;二是厚度压缩率约在75%以上,位移量变化较小,载荷急剧上升。结论:EPE发泡结构材料的压缩恢复性能、压缩率与EPE的厚度有密切关联,载荷—位移曲线的趋势基本一致,随着厚度的增大,材料承受的载荷增加,缓冲性能增强。     

三维纺织基疝修复假体的压缩性能定量研究

三维纺织基疝修复假体良好的抗压缩性能是保证疝气治疗无张力手术的关键,然而目前对于其抗压缩性能的评价尚无量化研究。为此,通过采用压缩仪探索定量表征三维纺织基疝修复假体抵抗压缩性能的测试方法及指标,进而获得影响测试结果的主要因素。结果表明：压缩仪测试可定量表征三维纺织基疝修复假体的压缩性能;压缩强力、应力松弛率和塑性变形率可较全面地评价三维纺织基疝修复假体的压缩性能;约束环直径和压缩量等测试参数对三维纺织基疝修复假体的抗压缩性能指标均有明显影响;三维疝修复假体的压缩测试最佳参数为3 cm直径约束环,30%压缩量。     

电子强力仪测试织物压缩性能方法的探讨

开发定型纺织仪器的新功能,充分发挥测试仪器的作用,提高仪器的使用价值,是一项值得探索的课题。以电子强力仪测试织物压缩性能,通过试验方法讨论、测试指标分析以及和风格仪测织物压缩性能的比较,探讨了这一课题。详细地讨论了压力值的大小与实验结果有效性的关系,指出多层织物压缩试验与单层织物压缩试验的异同处。     

睡枕对侧卧脸部的挤压研究及多功能睡枕设计

针对普通睡枕对人侧卧时的脸部存在挤压以及如何避免或减少挤压这一问题,利用医用血管显像仪TEKSQRAY-BVI对3位受试者进行血流微循环实验,并设计了一款具有防脸部压纹效果的四翼分体式多功能睡枕,利用Tactilus压力垫将此新结构睡枕与常见S型乳胶枕通过体压分布测试进行对比,探究多功能睡枕能否有效地减弱或消除对脸部的挤压。通过比较受压点与非受压点的变化率得出:侧卧时睡枕对侧脸挤压的影响较大;改良设计的四翼分体式多功能睡枕可使侧脸大面积悬空,从而避免睡枕对侧脸腮部和眼角的挤压,减弱不利影响。     

大豆的液压冷榨工艺及压榨特性

为研究大豆压榨过程中压榨特性的变化,以大豆为原料,探究了压榨时间、填料高度和压榨次数对残油率、压缩比、孔隙度、渗透率、微观结构的影响。结果表明：随着压榨时间的延长,大豆饼残油率先快速降低后趋于平缓;随着填料高度的增加,大豆饼残油率增加,压缩比减小,孔隙度增加,渗透率增加;二次压榨后大豆饼残油率降低,压缩比增加,孔隙度降低,渗透率降低;微观结构分析表明,随着填料高度的增加,细胞破碎率降低,更多的油脂残留在细胞内。因此,在实际生产中要合理控制压榨时间、填料高度和压榨次数来提高压榨效率。     

The effect of compression,stretching, and cooking temperature on free oil formation in mozzarella curd

The effect of the extent and rate of compression and stretching on free oil formation in Mozzarella cheese curd was investigated at 55, 65, and 75 degrees C. Confocal laser scanning microscopy was used to determine the maximum cross-sectional diameter, cross-sectional area, elongation factor (maximum divided by minimum cross-sectional diameter), and circularity of fat globules in the cheese curd at the different temperatures, and after stretching or compression. Free oil was not significantly affected by the rate of biaxial compression from 50 to 2000 mm/min at 65 degrees C, the rate of tensile stretching from 1000 to 2500 mm/min at 60 degrees C, or the extent of biaxial compression from 40 to 80% of the original height at 1000 mm/min and 65 degrees C. Increasing the rate of stretching from 1000 to 2500 mm/min increased the elongation factor from 1.91 to 2.61. Cross-sectional area, maximum diameter, and circularity were not affected by the rate of biaxial compression. The extent of curd compression had no effect on the milk fat globule size and shape. Increasing the extent of stretching at 60 degrees C and at 1000 mm/min increased the free oil content (on a fat basis) from 23.8% (curd stretched by 1.4x) to 32.3% (stretched by 4.6x) and the elongation factor of the globules, but did not affect any of the other globule parameters. Increasing the temperature of the cooking-stretching water increased the cross-sectional area, diameter of the globules, and free oil content from 24.1% at 55 degrees C to 34.5% at 75 degrees C for curd compressed to 50% height at 1000 mm/min.     

Effects of structural parameters on compressibility and soiling properties of machine woven carpets

Compressibility performance of the machine woven carpet after a static or dynamic loading expresses the texture deformation tendency of the carpet. This study is an experimental attempt to investigate the effects of pile height and pile density on compressibility and soiling property by dynamic loading, prolonged heavy static loading, compression recovery and artificial soiling tests. In this study, a total of 12 carpet samples with three different pile heights and four different pile densities were tested. As a result of this study, it was seen that higher pile density provides a lower thickness loss and so a lower level of texture deformation. On the other hand, pile height has a preventing effect for texture deformation for static loading and compression recovery tests whereas there is no considerable effect on dynamic loading test. There is no considerable difference between the soiling properties of the samples.     

冷冻食品的复合式泡沫包装箱设计研究

目的 设计一种能提高结构强度的复合式泡沫包装箱。 方法 将由护边套和护板构成的护架套装在泡沫包装箱的外部,组合成复合式泡沫包装箱,通过静态压缩实验和跌落实验,对比测试普通泡沫包装箱和复合式泡沫包装箱的抗压强度、抗破损性能。结果 复合式泡沫包装箱单体抗压强度1959.29N,普通泡沫包装箱单体抗压强度1557.22N;对于交错堆码条件下的抗压强度,由普通泡沫包装箱的1039.18N提升到复合式泡沫包装箱的1978.56N。采用护架后,箱体载物面跌落破损高度由800mm提高到1400mm,棱跌落破损高度由600mm提高到1200mm,角跌落破损高度由400mm提高到1000mm。结论 采用护架的复合式泡沫包装箱,箱体结构强度、耐破损性能都得到提升,解决多层堆码箱体压损问题,降低箱体的破损率,提高包装箱重复使用率。     

基于ANSYS的蜂窝纸板静压特性研究

简要介绍了国内外蜂窝纸板力学性能研究的发展现状和主要成果,运用ANSYS建立了蜂窝纸板的有限元模型,并对蜂窝纸板进行了应力应变分析。通过分析结果可知蜂窝纸板的应力集中出现在纸芯的上端,最大变形出现在离上端1/5处,且蜂窝纸芯的高度对蜂窝纸板压缩力学性能影响较小,与实验结果相符合。该研究对相关工程实际应用具有一定的参考价值。     

刺五加皂甙提取物对小鼠睡眠作用观察

研究目的在于观察刺五加皂甙对小鼠睡眠的影响。采用乙醇回流法提取刺五加皂甙,提取物总皂甙含量2.5%。分别以刺五加皂甙提取物低、中、高级量(2.5、5、10mg/kg.bw)连续灌胃小鼠30d,观察不同剂量刺五加皂甙组与对照组小鼠在注射戊巴比妥后30min内睡眠发生率、睡眠潜伏期和睡眠延长时间。中、高剂量组的戊巴比妥钠诱导小鼠睡眠时间比对照组显著延长(P0.05或P0.01),且戊巴比妥钠诱导的小鼠睡眠潜伏期显著低于对照组(P0.05),高剂量刺五加皂甙对阈下剂量巴比妥钠诱导小鼠睡眠发生率有显著影响(P0.05)。实验中未发现刺五加皂甙对小鼠有直接睡眠作用。结果显示刺五加皂甙提取物具有促进小鼠改善睡眠的作用。     

RHEOLOGICAL BEHAVIOUR OF BUTTER AT LARGE DEFORMATIONS

Eleven traditionally produced butter samples were evaluated for rheological properties at large deformations by lubricated and nonlubricated uniaxial compression with varying sample geometries and compression rates, by stress relaxation in shear and creep experiments in compression at 5–20C each. Compression forces required to deform cylindrical samples in nonlubricated conditions were higher than in lubricated cases. Correction of shape changes in nonlubricated stress-strain curves resulted in good agreement with lubricated experiments at low compression rates up to stress maxima or yielding. As frictional forces were relatively smaller at high deformation rates, lower stresses were obtained in nonlubricated conditions. Samples with higher height/diameter ratios showed more pronounced stress maxima. A biaxial extensional viscosity, η be , was computed for nonbrittle, soft samples. Typical slopes in logarithmic plots of viscosity against strain rate were approximately -1. At strains of about 0.01 creep compliance depended on compression stress. The average ratios of recovered to initial instantaneous compliance were between 0.31 and 0.59, and increased with sample temperature. A calculated ηBE from creep compression showed fair agreement with ηBE from static compression experiments. At comparable strains, a conversion of creep compliance to the stress relaxation modulus by an approximate method showed a good fit of experimental results.