多异多重复合涤纶长丝的染色均匀度及检测方法研究——(第二报)·袜筒染色工艺与测判色结果

对同一种袜带用三种染料配方、三种染色工艺进行对比试验,表明多异多重复合涤纶长丝染色均匀度检测中采用高温高压快速染色法染色,具有快速、准确、高效的优点,适合于工业化生产。     

FDY海岛丝编织判色技巧优化

FDY海岛丝需要进行织物判色后,确保染色的均匀。染色的均匀性判色的准确度,直接关系到产品的品质。若判色不准,产品外卖后造成客户对于品质的抱怨或投诉,影响公司形象。本文主要探讨FDY海岛丝编织判色流程优化,增强判色准确度,优化前后主要品质对比。提高产品竞争力,提升公司的品牌效应,获得更好的经济效益。     

涤纶长丝的染评

对影响涤纶长丝染色的间接因素诸如织袜、上梁、判色等进行了剖析并提出改进措施，从而提高了染色均匀性及判断涤纶长丝的质量准确性。     

编织过程中影响判色结果的因素

本文分析了在涤纶ＤＴＹ编织试验过程中，产生影响判色结果的常见疵点的因素，并介绍了怎样避免因判色误差使产品降等的经验。     

涤纶长丝的判色与织袜

本文分析了在涤纶ＤＴＹ织袜试验中，影响判色结果的常见因素，并介绍了怎样避免误判降等。     

用色度计辅助长丝袜带判色

介绍了色度计的测色原理以及如何用色度计对灰卡和袜带进行色差测试,建立仪器判定袜带色差的新方法。通过用色度计代替判色人员目光判色,减少了人员之间目测判色误差,为长丝袜带准确有效地测定色差提供了一种有效方法。     

SF-20A型判色标准光源的研制

<正> 一 前 言 SF—20A型判色标准光源主要应用于测定涤纶、锦纶长丝与假捻变形丝的染色均匀性,是合成纤维工厂检验部门所必须的配套设备之一。 新光源与上海石化总厂涤纶厂引进的日本帝人判色仪和日本松下电器配套的高显色性荧光管相比,技术参数和使用效果,均达到D65光源标准。用灰卡评级定等,样卡采用国际标准ISO105—A02—1978(E)以及国家标准250—84。     

涤纶长丝检验中匀染性问题探讨

结合新国标GB／T6508—2001和该公司的实际情况，对涤纶样品在匀染性检验中的样品制备、染色、判色及色差影响等问题作进一步探讨。     

仿毛涤纶长丝原纤化现象初探

借助扫描电镜,观察多异多重复合涤纶长丝织物摩擦后纤维纵向截面形态,发现纤维出现原纤化现象,并对其产生原纤化的原因进行了初步探讨。多异多重复合涤纶长丝由于其纺丝工艺的特点,形成皮芯结构和微原纤结构,以及纤维的五叶形截面,使它在受到摩擦应力时,易发生原纤化现象。     

多异多重涤纶长丝原纤化现象初探

借助扫描电镜,观察多异多重复合涤纶长丝织物摩擦后纤维纵向截面形态,发现纤维出现原纤化现象,并对其产生原纤化的原因进行了初步探讨。结果表明,多异多重复合涤纶长丝由于其纺丝工艺的特点,形成皮芯结构和微原纤结构以及纤维的五叶形截面,使其在受到磨擦应力时,易发生原纤化现象。     

熔体直纺2～60 dtex/72f涤纶FDY生产工艺探讨

采用特性黏度为0.645 dL/g的半消光PET熔体直接纺丝、利用双头纺工艺生产2～60 dtex/72 f涤纶FDY。结果表明,采用喷丝板孔径为0.20 mm,长径比为2.8,无风区高度80 mm,油嘴上油,纺丝温度289℃,环吹风风压40 Pa,拉伸温度91～93℃,拉伸倍数2.2～2.4,卷绕速度4 300 m/min,生产的涤纶FDY条干不匀率为1.35%,沸水收缩率7%,产品染色均匀度大于4级,利用双头纺工艺产能增了1倍。     

Color measurement of single yarn based on hyperspectral imaging system

This article proposed a novel approach to color measurement of a single yarn using hyperspectral imaging system (HIS). Due to the size of a single yarn, it is impossible for spectrophotometers to measure its color directly. The HIS can acquire the spectral reflectance of continuous bands within a region of interest on a yarn sample, which can achieve color measurement of a single yarn compared with traditional spectrophotometers. A single yarn is segmented from the background by a spectral matching method through adaptively setting threshold of Fréchet distance values. The spectral reflectance of single yarn is specified by a method that lightness of pixels used as weight. The experiment based on Pantone Cotton Chip Set shows that the interinstrument agreement between the HIS and a standard spectrophotometer Datacolor SF650 has a significant improvement after using the R-Model, and the average percentage improvement of the color difference is up to 54.99%. The yarn segmentation comparative experimental results show that the proposed method to segment single yarn from background is better in retaining the edge information of the yarn than the modified K-means clustering method, and the color of the yarn segmented by the proposed method is more similar to the actual color of single yarn.     

Fabrication of a multifunctional carbon nanotube "cotton" yarn by the direct chemical vapor deposition spinning process

A continuous cotton-like carbon nanotube fiber yarn, consisting of multiple threads of high purity double walled carbon nanotubes, was fabricated in a horizontal CVD gas flow reactor with water vapor densification by the direct chemical vapor deposition spinning process. The water vapor interaction leads to homogeneous shrinking of the CNT sock-like assembly in the gas flow. This allows well controlled continuous winding of the dense thread inside the reactor. The CNT yarn is quite thick (1-3 mm), has a highly porous structure (99%) while being mechanically strong and electrically conductive. The water vapor interaction leads to homogeneous oxidation of the CNTs, offering the yarn oxygen-functionalized surfaces. The unique structure and surface of the CNT yarn provide it multiple processing advantages and properties. It can be mechanically engineered into a dense yarn, infiltrated with polymers to form a composite and mixed with other yarns to form a blend, as demonstrated in this research. Therefore, this CNT yarn can be used as a "basic yarn" for various CNT based structural and functional applications.     

Some features of viscose yarn take-up on the package on machines of the PNSh type

Conclusions In unwinding a yarn from a package, tension increases from the outer winding layer to the inner ones; this occurs most sharply in unwinding the last 500–600 g of yarn.On increasing the yarn winding speed, tension rises, due to additional yarn friction on the package surface.On removal from the package, a yarn experiences periodic fluctuations in tension which vary both in amplitude and wavelength, both in unwinding a double layer and also in unwinding a single turn.Regardless of the form of yarn winding on packages, the tension in unwinding rises from the outer layers to the inner ones by a factor of 10.Translated from Khimicheskie Volokna, No. 4, pp. 32–35, July–August, 1986.     

长丝在网络器丝道内部运动的研究

采用16对光纤传感器测量涤纶长丝在椭圆形网络器丝道截面上的运动情况,研究了加工工艺对长丝在网络器丝道内部运动的影响。结果表明:加工气压过小或过大时,长丝都不能在丝道内自由旋转,长时间停留在丝道的上部或顶端;加工气压为0.3 MPa时,有利于网络结的形成;加工速度对长丝在丝道内部的运动影响不大;长丝在丝道截面上的运动轨迹类似横置的数字8。     

An improved method for functionalisation of carbon nanotube spun yarns with aryldiazonium compounds

We report a method for modifying carbon nanotube (CNT) spun yarns with aryldiazonium salts that involves the pH controlled application of the diazonium salts to CNTs both during and after the yarn formation process. This largely facilitates the chemical accessibility to CNTs within the yarn, potentially enabling a more extensive and uniform modification. The modified CNT yarns were characterised by X-ray photoelectron spectroscopy, Raman spectroscopy and scanning electron microscopy, and also examined for their mechanical properties. The results demonstrated that a CNT spun yarn was effectively modified by this method without impairing the yarn integrity. The formation of oligomerised polyene structures on the CNT surfaces was observed. This modification resulted in an increase in tensile strength and Young’s modulus of the CNT yarn. The functional groups grafted on CNTs also provide opportunities to form crosslinks in the yarn to further improve mechanical properties.     

The development of a new continuous dyeing method based on an aerosol delivery system

A continuous method of dyeing polyester yarn has been developed in which yarn is forced into a moving plug within apparatus based on the Fibre-M texturing system. Dye is then applied in droplet form to the yarn plug. The method relies on the dispersion of low-molecular-weight disperse dyes in a solvent medium to provide a uniform application to the core of the plug. The demands of the textile industry require an extension of the method to a wider range of dye types in a water-based medium. This paper describes a feasibility study of an aerosol method of dye application to a yarn plug.     

Control of the acetate textile yarn spinning process

Conclusions A dependence of the cross-sectional form of elementary filaments on spinning parameters has been used to control the process of spinning acetate textile yarn.The possibility of improving the textile-technological properties of a complex yarn by selecting the most rational cross-sectional form of the elementary filaments has been confirmed by the results of experimental processing.Tashkent Institute of Textile and Light Industry. Translated from Khimicheskie Volokna, No. 1, pp. 23–24,. January–February, 1987.     

Calculation of the heat-up of synthetic fibres during the heat-stretching process

Conclusions A computer calculation of the process of synthetic yarn heat-up during heat stretching which is based on using the thermal conductivity equation in the difference form permits one to analyse yarn heat-up through its depth, and also to take account of change in yarn tension and in temperature of the heating elements.The results obtained can be used to estimate the heat-up of yarns of any linear density.Translated from Khimicheskie Volokna, No. 5, pp. 13–14, September–October, 1984.     

Control of the process of spinning complex yarns from points of light reflection

Conclusions Points of light reflection are observed when a spun yarn is illuminated with a point light source in the sweeping zone.From the height and form of the zone for the position of points of light reflection, one can measure the nonuniformity in diameters of the elementary filaments in a section of complex yarn, work out an optimum regime for cooling the spun yarn, and monitor clogging of spinneret holes directly in operation.Translated from Khimicheskie Volokna, No. 6, pp. 53–55, November–December, 1987.