共查询到17条相似文献,搜索用时 46 毫秒
1.
为研究短纤维纱条中纤维的排列状态与纱条截面纤维根数分布不匀的关系,采用几何概率方法建立了等分区间内纤维左头端数分布与纱条截面纤维根数的期望之间的数学模型,并定义了表征纱条中纤维排列状态的参数。运用蒙特卡罗方法模拟了纱条截面根数不匀随排列参数变化的关系曲线。结果表明:短纤维纱条截面纤维根数的CV值与纱条中短纤维排列参数呈负线性关系,与纤维长度分布和模拟区间大小的划分无关;且当排列参数接近1时,即纤维左头端数在所划分区间中为固定值时,纱条截面纤维根数不匀最低,而当排列参数趋向于0时,即纤维左头端数在所划分区间中呈泊松分布时则不匀最大。 相似文献
2.
纱条中纤维的分布对其不匀率影响与检验方法棉纱的重量不匀率是衡量其质量优劣的重要指标之一。棉纱条中纤维的组成结构,如纤维平均长度,长短纤维比例,以及排列状态等都对纱条不匀率有影响。所以,可以经过其抽样检验法,了解、掌握纱条中纤维的分布情况。并进一步分析... 相似文献
3.
腈纶长丝束多区拉断法直接制条工艺要保证出条重量、收缩率及条干达到膨体纱的成纱要求,工艺配置复杂,受下列因素的影响:纤维的断裂伸长率、加热板温度、热牵伸倍数、存放时间、各区牵伸搭配等。根据以上各因素的不同的变化规律,相应调整制条工艺。 相似文献
4.
5.
为探索生条中短纤维含量对纱线指标的影响,更好地通过短纤维含量指标对纱线指标进行预测,通过在不同锡林刺辊速度条件下对棉纤维进行梳理,并采用相同的后序工艺进行纺纱,将生产的生条取样,借助USTERAFIS 测试仪检测纤维的长度分布,分别统计出10、12、14 和16 mm 以下4 种短纤维的含量,同时借助条干、毛羽和强力测试仪分别检测各种实验条件下生产纱线的条干、强力和毛羽等指标,最后使用SPSS 统计软件计算出4 种短纤维含量指标与成纱各指标之间的相关系数。结果表明:当梳理工艺变化时,生条中短纤维含量指标与条干部分指标有较高的正相关性,与成纱强力指标不存在显著的相关性,与毛羽指标甚至是负相关。 相似文献
6.
7.
8.
本文研究了在电容式条干均匀度仪上把现在反映内不匀的变异系数,改用反映内外不匀的总变民系数来表征纱条均匀度,用上述方式计算总变异,大大提高了测量精度。 相似文献
9.
本文结合我公司生产实际,并借鉴原料厂家生产经验,就腈纶膨体纱生产过程中的主要质量指标──收缩率的控制进行探讨。 相似文献
10.
本文提出了国内Tencel纤维条生产中常见的质量问题,并通过Tencel纤维条的生产实例,对加工过程中毛粒的形成及其改善措施进行了具体的分析,为国内Tencel纤维条的生产提供一份实际资料。 相似文献
11.
12.
13.
14.
15.
The variation of fiber arrangement caused by fiber motion during roller drafting process contributes greatly to the sliver properties, especially to the irregularity. In this study, a model of roller drafting based on fiber arrangement in the sliver was developed to calculate sliver irregularity. This proposed new method was capable of tracing the motion of individual fibers during the whole drafting process from the first floating fiber accelerating being accelerated to the last floating fiber being accelerated. The additional irregularity caused by the characteristic of accelerating in different cross-section was also calculated and analyzed by this simulation. The obtained simulation results were highly in accordance with empirical conclusions by the displacement deviation theory. Besides, the output fiber arrangement could be recorded and saved in order to be further regarded as the input fiber arrangement of the next following drafting process. The simulation results of three drafting zone were highly corresponded to the previous experimental research. Therefore, the as-developed model was proved to be useful and accurate to explore roller drafting and predict sliver irregularity. 相似文献
16.
Stretch‐breaking is a recent new technology proposed for ramie fiber processing. By analyzing the fiber motion and its breaking point pattern in the stretch‐breaking zone, the distribution of the fiber breaking point was estimated, and the relationship between fiber length parameters, such as average length, length irregularity, and short fiber content, and stretch‐breaking settings was constructed quantitatively. Furthermore, the factors affecting fiber length changes are discussed. In addition, the distribution of the fiber breaking point in the fiber is experimentally determined. It can be concluded that the stretch‐breaking gauge presents high correlation with the length parameters of the treated fiber. These conclusions are profoundly instructive to the practice of the stretch‐breaking technique. 相似文献
17.
Simulation on fiber random arrangement in the yarn has been studied in our previous research, where only fiber length distribution was considered. In this study, fiber fineness distribution was also taken into account in order to study the joint effect of fiber length and fineness distribution on fiber arrangement in the yarn. Eight-millimeter term limit irregularity of simulated yarn can be re-expressed by calculating the irregularity of the total weight of fibers within each yarn subsection. It can be seen from the results that the calculated irregularities considering fiber fineness distribution are closer to tested values compared with those without considering fiber fineness distribution. Besides, when the variance of fiber fineness gets greater, the difference between the calculated values with and without considering fiber fineness distribution becomes more obvious. For fiber length, the effect of average fiber length on yarn limit irregularity is very little, while its distribution has no significant effect on yarn limit irregularity. The improved simulation on fiber random arrangement in the yarn is more reasonable and can be applied for the prediction of yarn qualities. 相似文献