共查询到20条相似文献,搜索用时 218 毫秒
1.
2.
为了研究几种新型再生纤维素纤维的摩擦性能,探讨纤维的可纺性,利用Y151型纤维摩擦因数仪测试了Tencel、Viloft、Modal、竹纤维与不同材料的动摩擦因数和静摩擦因数,分析了新型再生纤维素纤维形态对摩擦的影响情况以及纤维摩擦性质与可纺性的关系.结果表明:圆形截面纤维的摩擦因数较异形截面纤维大;竹纤维的静摩擦因数最小,Tencel纤维的静摩擦因数较大,Viloft纤维的动摩擦因数最小,Modal纤维的动、静摩擦因数最大;竹纤维的静动摩擦因数之差最小;竹纤维平滑性好,对牵伸有利,Tencel、Modal纤维平滑性差,摩擦因数大,纺纱中开松困难,易产生静电,缠绕机件. 相似文献
3.
4.
5.
纸和纸板——静摩擦因数和动摩擦因数的测定——平面法 总被引:1,自引:0,他引:1
1 概述 该标准采用平面法测试纸张的动摩擦因数和静摩擦因数,测试时将两张相同纸的一张放在另一张上滑动,或将纸的另一面放在水平面上,在其上施加一垂直向下的力。 纸张的表面状态与其成形过程有关,其摩擦性能在很大程度上取决于测定时的动摩擦因数和静摩擦因数。机制纸的摩擦因数不仅在不同测定方向上存在差异(纵向和横向不同),而且在纸的两面也存在差异。 对于不同纸张,其静摩擦因数和动摩擦因数有着不同要求。如复印纸其纸张间最初滑动时的静摩擦因数较为重要,而对于纸袋纸等某些包装用纸,其表面经一定数量磨损后的动摩擦因数… 相似文献
6.
研究氧气低温等离子体处理对聚苯硫醚纤维性能的影响。在不同水平的压强、功率、时间条件下,对聚苯硫醚纤维进行氧气低温等离子处理,并测试其静摩擦因数、动摩擦因数、断裂强度损失率、断裂伸长减小率、毛细高度的变化情况。指出:处理功率对纤维机械性能影响显著,处理压强对纤维摩擦性能和润湿性能影响较大。根据综合平衡法确定最佳工艺为:压强20 Pa,功率200 W,时间300 s。 相似文献
7.
为克服兔毛纤维表面光滑、摩擦因数小而导致纤维之间抱合力小,可纺性差的缺点,用Na2CO3对兔毛预处理后,再使用DCCA氯化剂氧化处理工艺,使纤维之间获得一定的抱合力。分析不同质量分数的DCCA对纤维断裂强力、摩擦因数及表面形态的影响,结果表明,在25℃,pH值为4.5左右,处理时间为30 min,浴比为1∶25,DCCA质量分数占所处理纤维质量的1.5%时,纤维表面形态结构发生改变,从而提高了其表面摩擦因数,增加了纤维之间的抱合力,提高了兔毛纤维的可纺性。 相似文献
8.
9.
皮芯型甲壳素粘胶纤维的基本性能研究 总被引:1,自引:0,他引:1
研究皮芯型甲壳素粘胶纤维的基本性能.测试了其拉伸性、卷曲弹性、形态结构及摩擦性能,并与纯甲壳素纤维、普通粘胶纤维和Modal纤维进行了对比.结果表明:在常温干态下,皮芯型甲壳素粘胶纤维的断裂强度大于纯甲壳素纤维,小于普通粘胶纤维和Modal纤维;断裂伸长率大于纯甲壳素纤维、普通粘胶纤维和Modal纤维.湿态下皮芯型甲壳素粘胶纤维的力学性能变化较普通粘胶纤维的小,其卷曲弹性比普通粘胶纤维差;动摩擦因数和静摩擦因数均大于普通粘胶纤维. 相似文献
10.
真空等离子体处理对聚乳酸纤维表面性能的影响 总被引:1,自引:0,他引:1
采用真空等离子体技术处理聚乳酸纤维.通过扫描电镜观察处理后聚乳酸纤维的表面形态,发现处理后由于等离子体对纤维表面的刻蚀作用,使纤维表面产生不同程度的凸起或裂纹;通过测定不同处理时间纤维的失重率来反映纤维发生物理刻蚀的程度;测定并比较不同处理时间纤维摩擦因数的变化.结果表明,随处理时间的增加,摩擦因数明显增大. 相似文献
11.
12.
13.
Nanofibrous layer performs as a membrane that vibrates at low frequencies. This property is obtained by nano dimensions of the interfiber areas. Sound waves incident on the acoustic resonance membrane make the membrane oscillate, and the maximum amplitude occurs in the case of resonance. The structures based on the nanofibrous layers are employed for low-frequency sound absorption. The resonance of the nanofibrous elements allows acoustic energy to be converted into thermal energy. In this article, a nanofibrous layer was produced by electrostatic spinning from an aqueous solution of polyvinyl alcohol and the resonance effect of nanofibrous layer was studied. For this purpose, the new method developed for determination of resonance frequencies of a membrane was employed. The ultimate objective of the study was to assess the effect of mass per unit area on resonance frequencies of the membrane placed in an open and closed tube. The results indicated that the resonance frequencies of the membrane decreased with an increase of the mass per unit area of the nanofibrous membrane. Except for the lowest frequencies (first resonance peak), the resonant behavior of the membrane was affected by the resonance of tube. 相似文献
14.
Oil absorption capacity of meltblown polyester and polypropylene materials were determined with both coconut and safflower oils before and after material calendering. Fiber diameters, fiber surface characteristics, and percentage of total area heat pressed by calendering were determined by scanning electron microscopy. Noncalendered polypropylene (NC-PP) and noncalendered polyester consistently absorbed more oil than the calendered materials; NC-PP absorbed 635% of the material's weight in oil compared to 366% for the calendered polypropylene. Smaller average fiber diameters and greater material thickness provided a significantly larger surface area for the NC-PP material. This, combined with larger interfiber spacing, was responsible for the increased oil absorption by the NC-PP material. 相似文献
15.
通过酸析木素的方法在漂白硫酸盐浆纤维表面沉积木素,探讨了纸浆纤维表面木素含量对纸浆强度性能的影响.研究结果表明,随着硫酸盐木素溶液pH值的降低,木素在纸浆纤维表面的沉积吸附量增加;经过打浆作用的纸浆纤维暴露出更多的表面,能够吸附更多的木素;纸浆纤维表面木素含量与纸浆的抗张指数、耐破指数呈负的线性相关性,相关方程式分别为y=-1.23x +56.9(R=0.99)和y=-0.104x +4.62(R=0.96);增加纤维表面木素含量会降低纸浆纤维间的结合强度. 相似文献
16.
Engineering aspects of radio-wave heating for soil remediation and compatibility with biodegradation
Dielectric heating of soil using radio waves (RW) can be applied to support various remediation techniques, namely biodegradation and soil vapor extraction, under in situ, on site or ex situ conditions. To improve the spatial resolution of energy dissipation, the design of rod electrodes was modified with an air gap around the electrode allowing thermal treatment focused to the desired soil volume. A combination of low- and high-frequency electrical energy was successfully applied to homogeneously heat the capillary fringe, the boundary region of saturated and unsaturated zones. The energetic efficiency of the method was evaluated showing that an efficient transformation of RW energy to heat in the target volume can be achieved. By comparing biodegradation and soil respiration under conventional and electric (low-frequency resistive and dielectric RW) heating, the compatibility of the electric heating methods with bioremediation processes could be proven. Therefore, RW-supported microbial degradation of pollutants is a real option for accelerated soil remediation. 相似文献
17.
18.
19.
摘译 墨滴在纸页结构中的渗吸是一个非常复杂的过程.纸页中的孔隙以纳米级尺寸存在于纤维(纤维之间或几微米的大孔径)及其细胞壁中.墨滴的渗吸过程包括纤维间孔隙的毛细管作用、在纤维内部和细胞壁微孔中的渗透,以及沿纤维的表面扩散.喷墨墨滴大小只达到皮升级,因此纤维的芯吸效应和墨水在纤维表面的扩散起主要作用. 相似文献
20.
中国服饰文化类话题的高频词是立领、盘扣、兵马俑、青花瓷、象形文字和京剧脸谱。法国服饰文化的高频词是:Guileje、Balangxiaka、Jiwanglme、Chanel、Dior、Ardently和SaintLaurent……还有日本的高频同:连衣裙、袖口、领部、卡哇伊等等。中国关注文化符号,法国关注本土品牌的影响力,日本人关注服饰的技艺之美。关注的话题不同,是导致各国服装文化的差异的原因所在吗? 相似文献