丝胶用于毛纱上浆的浆料配方分析

分析了丝胶用于毛纱上浆的可行性和局限性。通过在浆料配方中加入助剂的方法来改善丝胶的上浆性能,并测试了聚丙烯酸甲酯、聚丙烯酰胺、二甲基硅油等试剂用量的变化对上浆性能的影响。依据实验结果确定出毛纱上浆的浆料配方如下:主浆料为75%丝胶、25%聚丙烯酸甲酯;助剂分别为5%聚丙烯酰胺、3%二甲基硅油、0.3%渗透剂JFC。采用此浆料配方对毛纱进行上浆实验和浆纱性能测试。实验结果表明:浆纱的断裂强力、断裂伸长率、增磨率和毛羽降低率等指标都得到了显著的提高。浆料配方合理,对毛纱上浆效果良好。     

毛纱单纱上浆的工艺探讨

分析了毛纱上浆应考虑的因素,确定了毛纱单纱上浆的浆料配方及主要工艺参数,浆后的毛纱毛羽伏贴强力提高,因此改善了单经单织物的织造性能。     

合成蛋白质浆料的上浆工艺研究

结合羊毛纤维表层结构及性能分析了毛纱上浆的工艺特点和难点；采用新型合成蛋白质浆料WG—1对毛纱进行了上浆工艺试验。对比测试结果表明毛纱上浆后不仅提高了强力和耐磨性，而且降低了毛羽。     

丝胶用于毛纱上浆的探索

概述了毛纱上浆的常用方法及其对浆料的要求,从水溶性、粘度、粘附力等方面详细地分析了丝胶对毛纱上浆的优势,探讨纯丝胶上浆存在的问题,设计出丝胶复配浆料的配方。     

精纺毛纱上浆工艺

介绍了精纺毛纱的特殊上浆要求;测试了3类常用浆料对毛纱的上浆性能,如粘附性、润湿性、混溶性、成膜性等,并作了比较分析。在此基础上,将PVA0588、ASP变性淀粉、聚丙烯酸酰胺浆料以不同混合比例进行了复配,并对浸透剂BXJ、FC及快速渗透王T的选用进行了比较试验。结果表明,只有确定合适的混合浆料复配比例,并在浆料中加入适量的浸透剂,才能保证精纺毛纱用浆料具有良好的上浆性能,达到较好的上浆效果。     

精纺毛纱上浆配方的优化设计

文章旨在选择一种适合于精梳毛纱上浆的最佳配方,采用接枝淀粉、酯化淀粉、丙烯酸类浆料,设计了10个浆料配方,在浆纱小样机上以相同的工艺参数进行上浆,对各个配方浆纱后纱线的断裂强力、断裂伸长、耐磨性、毛羽指数等指标进行测试和比较。实验表明:与酯化淀粉相比,接枝淀粉更适于毛纱上浆,接枝淀粉与丙烯酸类浆料组合的最佳比例为80∶20。     

纺织上浆常见问题解析

总结当前纺织上浆中经常遇到的几个技术难点。分析了浆纱毛羽、浆纱落物的形成原因,探讨了集聚纱上浆中断头多、上浆率波动大、上浆率偏高等问题的产生原因,提出了减少浆纱毛羽和落物、提高集聚纱上浆质量的有效措施。认为:根据"相似相容"原理选择浆料是控制浆纱毛羽和落物的关键,而选择有利于渗透的浆料和工艺,是集聚纺纱线上浆的关键。     

浆纱质量的评价指标及浆料上浆性能测试

介绍了评价上浆纱质量和浆料上浆性能的指标及其测试方法，同时认为耐磨性及毛羽贴挟率是上浆纱质量的最佳评价指标。     

磷酸酯接枝淀粉用于棉涤纱上浆的效果

研究磷酸酯接枝淀粉的上浆性和环保性.采用自制的磷酸酯接枝淀粉对棉涤55/45混纺纱进行了上浆试验,测试了浆纱强伸性能、毛羽数、耐磨性和渗透、被覆性以及浆料的退浆率和BOD5/CODcr值,并与PVA浆料进行了对比.结果显示:与PVA浆纱相比,磷酸酯接枝淀粉浆出的棉涤纱增强率较高、减伸率较大、增磨率较低、毛羽降低率略高,环保性较好.认为磷酸酯接枝淀粉基本可取代PVA用于棉涤纱的上浆.     

新型毛纱热熔浆料的开发

介绍了毛纱上浆对热熔浆料的基本要求，研制了一种适合毛纱上浆的热熔浆料，并对上浆毛纱的各项性能指标进行了测试和比较。     

阻尼牵伸纺纱技术及其对成纱质量的影响

从纺纱牵伸装置结构和牵伸机制方面,阐述了新型环锭纺阻尼牵伸系统提高成纱质量的原理及应用效果。分别采用传统环锭纺和阻尼牵伸纺技术纺制羊毛/羊绒混纺纱,并对成纱均匀度和强力指标进行测试,采用差异率进行对比分析。结果表明:阻尼牵伸系统可以显著改善成纱条干均匀度,降低粗节、细节、棉结、毛羽量等指标,其中粗节(+50%)数量降低41.0%,最为显著;成纱的强力、断裂伸长率和断裂功等力学指标有所提高,其中断裂伸长率提高23.1%,阻尼牵伸技术对提高毛纱的成纱质量具有良好的效果。     

PTT/毛混纺纱性能测试与评价

对规格相同的PTT/毛和PET/毛混纺纱进行测试,对比分析PTT/毛混纺纱线的毛羽、拉伸性能、回弹性能及沸水收缩率。实验结果表明,PTT/毛混纺纱线毛羽较少,纱线拉伸模量低于PET/毛混纺纱,纱线拉伸断裂伸长率较高;PTT/毛混纺纱在定伸长5%条件下,弹性回复率达到96%,在定伸长15%的条件下弹性回复率达到87%,且急弹性回复率大于PET/毛混纺纱;PTT/毛混纺纱的沸水收缩率与PET/毛混纺纱的沸水收缩率相比差异不大,都具有良好的沸水稳定性。     

毛/涤混纺纱上浆研究

单经单纬毛织物的兴起,决定了精纺毛/涤混纺纱必须通过浆纱工序.羊毛纤维表面有鳞片层,湿热状态下会产生缩绒现象.毛纱弹性好,但毛羽多、湿强度低、耐热耐碱性差.根据羊毛纤维和纱线的结构、特性,文章分析了毛纱上浆的特点和难点,依据"相似相溶"原理,研究制定了毛/涤混纺纱上浆用浆料及浆料配方,并阐述了上浆条件和主要工艺参数.上浆后,纱线达到了贴伏毛羽、增加耐磨、增强保伸、改善织物织造性能的目的.通过大量实验,测试并分析了浆液性能、浆膜性能和浆纱质量,得出了适用于毛/涤混纺纱上浆的最佳浆料配方.     

Tensile and Frictional Properties of Wool-Cotton Union Khadi Fabrics

ABSTRACT

This paper describes the tensile and frictional behavior of wool-cotton union fabrics developed using different wool-cotton blended warp yarns, and mixed wool weft yarns spun on khadi spinning system. The tenacity and elongation at break of fabric increase with the blending of cotton with JK crossbred wool in the warp direction and high content of Australian merino wool in the weft direction, however, initial modulus decreases. The static and dynamic coefficient of friction positively correlates to the wool content in warp yarn and negatively correlates with linear density and the proportion of Australian merino wool in weft yarn.     

纯纺木棉纱上浆性能初探

针对纯纺木棉纱强力低、毛羽多、耐磨性差,织造困难等问题,对27.8 tex纯纺木棉纱进行上浆处理,以达到改善纱线性能,满足织造工艺的目的。根据木棉纱本身特点,选用酸性变性淀粉和聚乙烯醇(PVA)的混合浆料为主浆料,以浆料的含固率、浆料配比等因素为影响因子,以纱线的增强率、减伸率、毛羽降低率为研究对象,利用正交分析法,讨论浆纱的工艺条件对纱线性能的影响。结果表明：含固率较低易于浆料的渗透,有助于纱线力学性能的提高;一定范围内提高PVA浆料含量有利于纱线各项性能指标的提高,加入少量的PVA0588有助于上浆品质的改善。     

Effect of key process variables on mechanical properties of blended vortex spun yarns

A study of significant factors and their interaction during vortex yarn spinning has been carried out to achieve desired mechanical properties of the polyethylene terephthalate/cotton blended yarns which can offer process and performance advantages. The key significant factors, i.e. feed ratio, air pressure and spindle size were varied in a mixed-level factorial design. The mechanical properties (count lea strength product, tenacity and elongation at break) were studied and feed ratio was found to significantly affect the tenacity and elongation at break of spun yarns. A significant effect of these parameters was observed on the diameter and hairiness of the Muratec vortex spun yarn.     

9—THE PROPERTIES OF AIR-TEXTURED CONTINUOUS FILAMENT YARNS

A processing programme is outlined in which yarn pre-twist, applied air-pressure, and supply-yarn overfeed are systematically varied in the air-jet bulking process to investigate their effects on air-textured nylon 6.6 continuous-filament yarns.

Optical magnification of the air-textured yarns enables the average loop sizes and frequencies to be measured. The experimental results are shown to be in general agreement with a suggested mechanism of the process, which argues that the initial filament twist in the parent yarn redistributes itself as snarled loops and that the overfed yarn contributes to the size of such loops; the deflexion of filaments by air-drag forces is also shown to make a contribution to a looping effect, which can be estimated theoretically. Increasing the yam overfeed increases both the loop size and the loop frequency. Increasing the yam pre-twist decreases the loop size and increases the loop frequency. Increasing the air-pressure also decreases the loop size and increases the loop frequency. Experimental and theoretical results are in general agreement.

As would be expected, the only processing condition that effects a change in linear density is the overfeed, but all the processing conditions that have an effect on loop dimensions also have an effect on the change in volume, i.e., on the physical bulk. Overfeed is the greatest single contributor to physical bulk, since both loop size and loop frequency increase with overfeed, occluded air spaces being thereby created in yarn and fabric form; conversely, with varying twists and air-pressures, the effects of decreasing loop size and increasing loop frequency are to some extent self-balancing in their contribution to physical bulk.

It is shown how the various processing parameters affect the stability of air-textured yarns. Textured yams produced from parent yarns possessing small amounts of pre-twist have a high instability because of the lack of binding twist for securing the entangled structure. Increasing the overfeed greatly increases the number and size of loops, and this causes greater instability. Increases in the applied air-pressure also increase the yarn instability. Two new mechanical techniques have been devised to measure the yarn instability, and these have been found to be greatly superior to the stability-testing apparatus normally used, which has serious defects from the viewpoint of accuracy.

The tenacity of the air-textured yarns tends to decrease for increasing values of all the main processing variables considered. Increasing the yarn pre-twist tends to reduce the percentage elongation at break, but independent increases in the supply-yarn overfeed and the applied air-pressure both tend to increase this characteristic. These results are interpreted in the light of the bulking mechanism previously postulated.     

An approach to predict the tensile strength of a two-ply yarn from single filament yarn

It is considered that the strength of the ply yarn consisting of continuous filaments mainly depends on the properties of the single yarn and the cohesion forces among the single yarns, thus a mathematical model with relatively few parameters under given assumptions is established to predict the tensile strength of a two-ply yarn from single filament yarn. Relative relationships of the tensile force part and the interaction part are developed, respectively. The single yarn is tested to obtain fundamental data e.g. yarn strength and breaking elongation. After two strands of filament yarns are twisted into the ply yarns under different twist levels, the tensile strength, breaking elongation and structure parameters are measured or calculated for verifying the model later. Finally, the results show good agreement with the experimental values, and this model can be used to predict the performance of the finished strand yarns in actual productions.     

Studying the Tensile Properties at the First Break of Multiple-Yarn Structure Fancy Gimp Yarns Using the Design of Experiments

ABSTRACT

This study was conducted to identify the factors and the interactions, which affect the load and elongation at the first break of gimp yarns. The experimental design had seven factors: two levels each. It was found that using two single yarns, instead of a similar ply yarn, for the core component, caused the increase of values of load and elongation at the first break. The effect component contributed positively to the load and elongation when it was a cotton yarn rather than a bamboo yarn. This study contributes to a broader understanding of process–structure–property relationships of fancy yarn.