POY蛛网丝成因分析

介绍Bamag公司制造的SW4SSD卷绕机的成型机理,对其所产生的蛛网丝的原因进行分析,并提出一些解决蛛网丝的办法。     

锦纶6高速纺卷绕产生蛛网丝的影响因素

叙述了Barmag公司SW46SSD型卷绕头卷绕成形中，超喂率、干扰振幅、接触压力、卷绕头等因素对蛛网丝的影响。     

锦纶6FDY蛛网丝形成原因浅析

岳阳石油化工总厂化纤厂从意大利 NOY公司引进 1 .4kt/ a PA6 FDY生产线 ,于 1 996年投产运行。生产过程中常出现蛛网丝卷装 ,后加工退绕困难 ,且生产中易断头、缠辊。根据 75dtex/ 1 8fPA6 FDY的生产情况 ,从设备和工艺两方面对形成蛛网丝的原因进行浅析。1　试验原料　 PA6半消光切片 ,相对粘度 2 .5±0 .0 3 ,自产 ;设备　意大利 NOY公司 FDY生产线 ,CW6 R-92 0 -43 0卷绕头。2　结果与讨论2 .1　卷绕张力卷绕张力是指丝的在线张力 ,不同线密度的纤维有不同的张力范围。如果张力过大 ,丝在丝饼两端转向不顺畅 ,易形成凸肩 ;如…     

氨纶蛛网丝的形成与丝的表面性能的关系

分析了油剂及上油率、原液黏度、原液中硬脂酸镁(MG-s)t的含量、纺丝卷绕间温湿度环境等因素对氨纶丝表面性能的影响,发现氨纶丝表面的摩擦性能和静电性能是影响蛛网丝形成的重要原因,从而提出了改善蛛网丝形成的方法。     

可编程控制器（PLC）在络筒机上的应用

本文介绍了应用可编程控制器（PLC）,通过编程对络筒机锭位的丝筒卷绕进行自动检测和控制,从而控制丝的卷绕长度,实现成品丝筒的大小和丝长可控。     

CKV453卷绕机失速原因及对策

1　失速现象及危害　　江苏群发化工有限公司锦纶厂现有的 6台CKV45 3卷绕机在生产过程中多次出现失速现象 ,导致卷重偏高丝的产生 ,严重影响了产品质量。在 1 870dtexPA6帘子线的生产中 ,通过数据分析发现 :卷重偏高的丝主要集中在卷绕丝内层 ,即从开始位置起 ,长度约为 2 0m。以纺丝速度 360m/min计算 ,则产生失速的时间在卷绕开始的 3s左右。即卷绕辊未进丝之前是以平稳纺速运行 ,而进丝之后 3s左右时间内 ,卷绕辊失速 ,产生卷重偏高丝。2　失速理论分析　　卷绕辊未进丝之前 ,摩擦辊带动卷绕辊达到动平衡。丝束进入卷绕辊与摩擦辊之间…     

合理增加DTY丝筒卷装重量的方法探讨

在不改变ＤＴＹ卷绕丝筒密度和丝筒卷绕外径的前提下,通过减小ＤＴＹ丝筒的卷绕角角度来增加ＤＴＹ的丝筒卷装重量,并且经过理论推导和工作实践证明了上述方法是确实可行的。由此为ＤＴＹ生产厂家增加了可观的净增收入,对当前ＤＴＹ生产中的成本控制有借鉴作用。     

卷绕比与直接无捻粗纱丝饼成形

介绍了卷绕比定义,直接无捻粗纱丝饼成形过程,卷绕比的设定,对丝饼成形的影响,得出结论:卷绕比的选择与丝束的tex值之间的关系较大,高tex的丝饼宜选用较小的卷绕比值,低tex的丝饼宜选用较大一些的卷绕比:丝饼成形还受拉丝设备工艺等影响,且卷绕过程中,一个细小差别可能会引起较大变化。     

涤纶预取向丝卷绕成型的工艺探讨

探讨了卷绕设备和生产工艺对涤纶预取向丝卷绕成型的影响。在设备方面,卷绕机中的横动装置是影响卷绕成型的关键部件;为保证成型质量,拨叉和成型板要定期校验。在生产工艺方面,接触压力随丝饼直径的增加而增大,卷绕角随丝饼直径的增大而先增大后减小;另外,需要根据品种和成型质量,适当调整卷绕张力和干扰波,当卷绕张力为16 cN、干扰波中振幅为1.5%、频率为10 r/min时,生产的278 dtex/288 f涤纶预取向丝的成型质量最佳。     

基于数学建模的热辊牵伸过程研究

对高强锦纶6热辊牵伸过程中第一个牵伸辊和第二个牵伸辊之间,以及第二个牵伸辊和第三个牵伸辊之间的应力、应变、牵伸速度、纤维直径、双折射率和结晶度与卷绕长度的对应关系进行了数学模拟。结果表明,不同阶段相邻牵伸辊之间的牵伸参数与卷绕长度的对应关系基本相同;第二个牵伸辊和第三个牵伸辊之间的丝条出第三个牵伸辊时,实测丝条速度、卷绕应力和成品丝结晶度分别为5271 m/min、42MPa和0.63,而本文的数学模拟得到的丝条速度、卷绕应力和成品丝结晶度分别为5220 m/min、40MPa和0.61,第二个牵伸辊和第三个牵伸辊之间的丝条速度、卷绕应力和结晶度测试结果与模拟结果基本吻合。可以采用本文的数学模型对高强锦纶6热辊牵伸过程进行模拟与预测。     

Improvement of tensile properties of ramie yarns by applying a winding machine with heat treatment

A winding machine with heat treatment was newly developed to strengthen ramie yarns. During the treatment process, ramie yarn in normal or wet state was wound on a winding machine and passed continuously through a heater at 100 and 150°C, respectively, with different winding speeds and tensions. Higher tensile strength and stiffness of ramie yarn was achieved after heat treatment on wet yarn and winding speed had a significant influence on the tensile properties of yarns. However, a little decline in tensile strength was found for ramie yarns after heat treatment in normal state. This implies that the water‐swollened structure of ramie yarn during the heat treatment is crucial in strengthening yarns. In the case of heat treatment on wet yarns, the effect of winding tension on the tensile properties of yarns was studied. It was found that the tensile strengths and Young's moduli of ramie yarns first increased and then reached equilibrium as the winding tension was increased. The crystallinity calculated from X‐ray diffraction diagrams showed a slight decrease in heat‐treated ramie yarns whereas the crystalline orientation factors had no appreciable change. It was considered that the improved effect was related to the more oriented molecular chains in amorphous region and optimized yarn structure. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Some Factors Affecting the Bulk of Package-dyed Wool Carpet Yarns and their Performance in Tufted Carpets

Hank- and package-dyed woollen and semi-worsted yarns are compared after winding onto several different types of package. The performance features, appearance retention and texture of the tufted carpets made from these yarns were found to be determined more by blend composition and spinning method than by the dyeing methods, even though hank-dyed yarns were bulkier. Test results indicate that package dyeing and hank dyeing are equally satisfactory dyeing methods for carpet yarns.     

Eks winding heads: Cross winding heads for yarns for a number of regions of application

Eks winding heads: Cross winding heads for yarns for a number of regions of application     

Effects of winding speed,drawing and heating on the crystalline structure of nylon 6 yarns

Nylon 6 yarns were wound at speeds varying from 700 to 5500 mpm. The effect of the winding speed on both α- and γ-type crystals in these undrawn yarns was studied. Also the effects of dry heat, tension, and heating in saturated steam were included in this investigation, since they provide useful information for drawing and heat-setting processes. The emphasis was put on the characterization of the crystalline part of the yarns. By applying recently developed techniques, relative amounts of the two crystalline components, as well as their orientation factors, could be determined. Concerning the undrawn, conditioned yarns, it was found that the amount of γ type increases with the winding speed. The γ crystals are much better oriented than the α crystals, and the crystal dimensions of the γ structure largely depend on the winding speed in contrast to those of the α crystals. Indications were found that γ crystals are mainly generated from orientation-induced nuclei at speeds higher than 2500 mpm and that α crystals grow slowly at relatively low temperatures after moisture pickup during conditioning. Drawing at high ratios causes a transition from γ to α, while the thermal stability of the γ crystals appears to be slightly below that of the α crystals, resulting in γ crystal to α crystal transitions at extremely high temperatures or under usual autoclaving conditions.     

Determination of the maximum diameter of the winding on increasing the weight of a package with a biconical form

Conclusions A formula has been proposed for determining the instantaneous value of the yarn winding angle in forming a package of biconical form with precision cross-winding.The fundamental possibility of obtaining a package of weight up to 6 kg on a rewinding machine for technical polyamide yarns using existing type PTsG yarn carriers (59.3×300) has been demonstrated.Translated from Khimicheskie Volokna, No. 1, p. 42, January–February, 1988.     

基于非测地线理论五坐标缠绕的实验研究

本文分析了4坐标缠绕对纤维缠绕构件机械性能和质量的影响,提出摆角坐标B轴的意义,并针对椭球压力容器这种典型的回转体芯模,研究了具体的各坐标机器路径。为了解决4坐标纤维缠绕过程中纤维在封头处的扭曲、堆积现象,进行了5坐标纤维缠绕实验研究。通过4坐标和5坐标的一个标准缠绕线型,分析和对比纱线的变化情况。实验表明,5坐标缠绕较好地解决了封头处纤维堆积问题。     

Relationship between set and bulk of package–dyed wool yarns

The loss of bulk in hand–knitting yarns as a result of package dyeing has been investigated. Simulated dyeing of packages, prepared with and without axial compression, has revealed a correlation between the bulk of the relaxed dyed yarns and the permanent longitudinal set imparted to the yarns. The strain in the yarn in the wet package, and hence the longitudinal set, is related to the hygral expansion of the yarn and the strain imposed on the yarn during winding of the package. The role of axial compression of the package in determining loss of bulk is also considered. Finally it is shown that by adding reagents to the dyebath that inhibit the setting reaction, the loss of bulk can be markedly decreased, provided also that the yarns are fully relaxed after being dyed.     

A multispectral imaging approach to colour measurement and colour matching of single yarns without winding

This paper investigates a multispectral imaging approach to colour measurement and colour matching of single yarns. The small size of a single yarn makes it impossible for spectrophotometers directly to acquire its spectral reflectance. Multispectral imaging systems, on the other hand, have the potential to measure the reflectance of single yarns as they can record both the spectral and the spatial information of a sample. A multispectral imaging system, namely imaging colour measurement, has been developed to conduct colour measurement of single yarns. A single yarn is first detected from backgrounds by a modified K‐means clustering method. The reflectance of the single yarn is then specified by an averaging method. Comparative experiments based on 100 pairs of single yarns and corresponding yarn windings show that the reflectance magnitude of a single yarn acquired by imaging colour measurement is smaller than that of corresponding yarn winding measured by a Datacolor 650 spectrophotometer. Experiments on 16 single yarns show that the repeatability and spatial reproducibility of the imaging colour measurement system in measuring a single yarn colour are 0.1185 and 0.2827 CMC(2:1) units. A colour matching comparison experiment (pass or fail), using 24 pairs of single yarns and corresponding pairs of solid‐colour yarn dyed fabrics, shows that single yarns measured by imaging colour measurement can achieve similar colour matching results to solid‐colour yarn dyed fabrics measured by the Datacolor 650 spectrophotometer, with degrees of similarity of 87.5 and 83.3% when the CMC(2:1) and CIE2000(2:1:1) colour difference formulas are employed.     

间位芳纶低线密度纺纱技术的工艺优化研究

根据间位芳纶的物理和力学性能特点,利用棉纺设备并分别对开清棉、梳棉、并条、粗纱、细纱、管纱、络筒等工序作出相应的工艺调整,以各工序工艺技术的优化适应间位芳纶低线密度纺纱,提出了生产高品质间位芳纶低线密度纱的可行性工艺路线。