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为提高非织造布罗拉梳理机金属针布握持、转移纤维能力,避免在梳理过程中出现不抓棉、掉网、飞花、内凝聚辊缠棉的问题,分析研发的3类高转移率金属针布齿条的齿形结构及型号,并在浙江、安徽使用不同梳理机对不同品种纤维进行试纺。结果表明:高转移率金属针布齿条齿形设计基本合理,对纤维的抓取、控制能力增强,梳理和转移效果提高,适用于包卷中道夫、道夫、工作辊和外凝聚辊。 相似文献
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本就摩擦纺纱机不同倾角的输棉管道对纤维凝聚状态的影响进行了研究,从中确定了合理的纤维凝聚分布特征,为合理设计输棉管道倾角,提高成纱强力提供了依据。 相似文献
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热固结非织造布在梳理系统上进行铺网,纤 维排列方向是造成纤网在机器方向和垂直于机器 方向强力不同的主要原因。现在通过使用凝聚辊 和气流装置可获得纤维杂乱的效果。在梳理机 上,通过增加杂乱辊,使纤维以连续的较慢的表面 速度运行,以便扩大道夫上的凝聚作用,可得到半 相似文献
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一、A004型抓棉机打手的轴端结构 A004型抓棉机是我厂六十年代的自制产品,经郑州纺织机械厂改进后进行了批量生产。但由于轴头结构不合理,造成缠花摩擦起火的问题一直未得到解决。其结构如图1所示。虽然在其两端加装了“打手端盖”,但打手轴仍然外露一部分,打手抓起的棉花仍不可避免地会掉落到高速旋转的打手轴的外露部分上,由于打手轴的直径仅为40毫米,由于棉块纤维互相钩缠及纤维之间的抱合力的作用,棉块就会在打手轴上发生缠绕作用,而且越缠越紧,跟 相似文献
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《棉纺织技术》2020,(6)
探讨一种纳米纤维包缠纱纺纱装置的开发要点与应用效果。开发的新型纳米纤维包缠纺纱装置,从机后向机前依次设置为粗纱喂入部、纳米纤维包缠部、干燥部、牵伸部和加捻卷绕部。其核心部分为粗纱喂入部分和纳米纤维包缠部分。粗纱喂入部由粗纱架、旋转装置组成,旋转装置安置在粗纱管和用于将粗纱松捻的假捻器上;纳米纤维包缠部添加设计了静电纺丝装置,在纳米纤维包缠部分与牵伸部分之间设置干燥部分。开发出的聚丙烯腈纳米纤维包缠纯棉15.8 tex纱和聚丙烯腈纳米纤维包缠棉/莱赛尔/黄麻45/35/20 32.4 tex纱具有纳米纤维表面效应,且性能指标较好。认为:该装置生产简单、可控,加工的纳米纤维包缠纱中纳米纤维分布均匀度良好。 相似文献
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为研究全聚纺混纺纱中纤维的径向分布情况,采用环锭纺、网格圈型集聚纺和全聚纺3种方法纺制28.1tex涤棉混纺纱线,运用哈氏切片器切取三种混纺纱线样本,借助MOTTC B1型显微镜观察并采集样本中两种纤维的分布状况图,结合汉密尔顿(Hamilton)指数的方法分析,得到全聚纺混纺纱内涤纶纤维和棉纤维在纱截面内的内外转移趋势及分布规律。结果指出:利用传统环锭纺纺制的涤棉混纺纱,涤纶纤维有明显向纱芯转移的趋势,而网格圈型集聚纺,涤纶纤维向纱芯转移的趋势较传统环锭纺弱,全聚纺相对于网格圈型集聚纺而言,涤纶纤维分布更加随机,并且涤纶纤维有向纱外转移的趋势。 相似文献
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In order to develop efficient and low-cost hot gas filtration medium, composite filters were prepared with PTFE fabric as the substrate, and mixing of OPAN fiber and PPS fibers as functional layers. The fiber entanglement was evaluated via image analysis, and some other characteristics, such as tensile properties, pore size, thermal stability, and filtration performance were also discussed. The results showed that with increasing ratio of PPS fibers, the fiber entanglement, breaking strength, thermal stability, and filtration efficiency increase, while the pore size decreases. Mixing with 40% weight PPS fiber leads to the filtration efficiency of the composite filter increasing from 64.68 to 94.68% for removing particles with a diameter of 2.5 μm. 相似文献
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为研究新型全聚赛络混纺纱成纱性能,采用一根5.0g/10m 精梳棉粗纱与另一根3.4g/10m涤纶粗纱在细纱工序进行全聚赛络混纺,纺出4种细度的棉/4 涤(60/40)新型全聚赛络混纺纱,并与单根混纺粗纱喂入所纺出的纱进行成纱质量对比;运用哈氏切片器,切取8种混纺纱线样本,在MOTTC B1型显微镜下观察纤维的分布状况,结合汉密尔顿指数分析方法,得到每种混纺纱内纤维的分布规律及内外转移趋势。结果表明:新型全聚赛络混纺纱的单纱条干CV值、断裂强力明显优于环锭混纺纱,且毛羽少;从单纱截面图得出,新型混纺纱中涤纶向纱芯转移呈现棉包覆涤纶的趋势,而环锭纺混纺纱中涤纶分布比较随机。 相似文献
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为探讨全聚纺集聚区对成纱质量的影响,在加装全聚纺装置的QFA1528型细纱机上,分别采用四种集聚负压:1600Pa、2000Pa、2400Pa、2800Pa;四种槽型的吸风插件:水滴槽、短斜槽、直槽、长斜槽;三种不同的气流导向片:A型、B型、C型,纺制线密度为9.7tex的纯棉全聚纺纱线,并对纱线的各项性能指标进行测试。采用示踪纤维方法,对纱体内纤维的内外转移系数进行测量,继而分析不同集聚区工艺对成纱质量的影响。结果表明:当负压为2000Pa时,纱线条干和强力最好,当负压为2800Pa时,3mm以上的有害毛羽最少;当吸风插件选择短斜槽时,纱线条干最好,选择长斜槽时,纱线的强力和毛羽最好;当气流导向片选择B型时,纱线的条干最好,选择C型时,纱线的强力最好。 相似文献
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本研究计算了七个不同横截面形的网络器丝道内压缩气流的特征,并将这些特征和网络器的性能联系起来,为设计出性能优良的网络器提供理论依据。流场计算用的是商业计算流体力学软件ANSYS CFX。网络器的性能通过网络丝的网络度和网络牢度评价。通过流场计算可以得出:包含喷嘴轴线的丝道横截面上的涡流可以为长丝的旋转提供较大的空间;丝道轴线上,较大的流体速度有利于长丝的开松。但是,太大的流体速度会使长丝粘贴在丝道壁上,阻碍了长丝的相互纠缠,降低了网络丝的网络度。 相似文献
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Complete condensing spinning (CCS) is one kind of pneumatic compact spinning. A kind of hollow roller with strip groove structure on the surface is used to condense the fiber bundle and improve the yarn qualities. In this paper, the numerical simulation of flow field in CCS is studied using fluent software. Using AutoCAD Software, according to the physical parameters of the practical system, a three-dimensional (3D) model of the condensing zone is established firstly. Then, the numerical simulations of the flow field in CCS were presented. Three kinds of suction units, straight-type, long-skewed, and short-skewed, and three kinds of guiding devices, A-type, B-type, and C-type, were discussed. Corresponding simulations in the front, middle, and back condensing zone and arc line along the front roller surface direction were given and analyzed comparatively. It is shown that the flow field distribution in CCS is stable and can condense the fibers well. The shape of suction unit may mainly influence the output of fiber strand in the condensing zone and affect the yarn evenness. When compared with the long-skewed and short-skewed suction units, the straight-type suction unit is beneficial for the fiber strand output leading to better yarn evenness possibly. However, the distribution ranges of flow field in CCS with both long-skewed and short-skewed suction units are larger than that of the straight-type suction unit. Furthermore, comparing with that of without a guiding device, the direct transverse air condensing force in CCS using a guiding device is greatly larger, which is beneficial for reducing the yarn hairiness. However, the assisted condensing forces are smaller and make the yarn evenness possibly worse. Finally, the obtained numerical results are illustrated by spinning experiments. 相似文献