细纱压力棒隔距块使用中的问题及解决措施

为解决细纱压力棒隔距块使用中出现的牵伸不开"出硬头"的问题,对产生机理及原因进行了分析.通过采用小粗纱捻系数、大后区罗拉隔距、大后区牵伸倍数的"一小两大"工艺配置,加强设备维修和专件管理,加大操作管理力度,合理控制温湿度等措施,有效解决了牵伸不开"出硬头"的问题,较好地发挥了压力棒隔距块降低条干CV值的作用,稳定和提高了产品质量.     

使用压力棒隔距块生产纯棉特细号纱的实践

分析了细纱机前牵伸区使用压力棒的作用和效果,在CJ 5.83 tex品种上采用罗拉隔距、后区牵伸倍数、钳口隔距3因素3水平正交试验对工艺进行了优选.结果表明:工艺配置为罗拉隔距19 mm×35 mm、后区牵伸1.17倍、钳口隔距2.5 mm时成纱质量较优.推广使用压力棒隔距块后.对条干CV、千米细节、千米粗节改善明显,但千米棉结略有增加.曲面形压力棒有助于减少须条上翻现象.在使用中要加强机台清洁,同时做好器材维修减少"出硬头".     

细纱牵伸"吐硬头"问题的原因及处理

针对纺纱生产中遇到的吐硬头问题,详细分析了牵伸部位吐硬头原因及处理措施;指出钳口咬合期是纺纱不稳定因素的高发期,胶圈、压力,牵伸倍数、摇架弹簧、隔距块规格都是影响成纱质量的重要因素,应使其合理配置才能改善成纱质量.     

细纱压力棒隔距块的应用实践

介绍了细纱压力棒隔距块机理以及主要特点，工艺配置采取两大一小的工艺措施；对使用中出现的锭间差异过大、毛羽增加和牵伸不开的问题，加强设备维修，加大操作管理力度，合理的温湿度管理控制措施；能够有效控制管间CVb％差异，毛羽增加以及牵伸不开出硬头的现象，发挥了压力棒隔距块的最大功效，降低了条干CV％，提高了产品质量。     

细纱压力棒隔距块的应用实践

介绍了细纱压力棒隔距块的特点和应用机理,工艺方面采取加大后区牵伸倍数,加大后区罗拉隔距,减少粗纱捻系数的"两大一小"工艺措施;加强设备维修,加大操作管理力度,合理的温湿度管理控制措施;能够有效控制管间CVb值差异、毛羽数量以及牵伸不开出硬头的问题,达到降低条干CV值,提高成纱质量的目的.     

应用新型异型曲面压力棒隔距块的效果分析

为了提高成纱质量,降低纱疵,尤其是棉结,探讨了细纱前区压力棒隔距块对成纱质量的影响,对比分析了新型异型曲面压力棒隔距块的使用效果,指出了使用异型压力棒隔距块可大幅度降低细节和棉结,其效果优于圆柱形压力棒隔距块,更优于普通隔距块,但为了避免出硬头,隔距块的规格应比普通隔距块大一个级别。在纺纯棉中粗号纱时,应做好牵伸区内的清洁工作。     

应用压力棒隔距块纺纱出硬头问题的研究

针对细纱机使用带压力棒隔距块纺纱过程中出硬头问题,设置了三种工艺配置对带压力棒隔距块和普通隔距块进行了试验:①其它纺纱条件不变,选用的隔距块比普通隔距块放大一档;②隔距块放大一档并适当减小粗纱捻度;③隔距块放大一档、适当减小粗纱捻度后,再适当提高细纱摇架压力.试验表明第三种工艺配置的带压力棒隔距块能显著改善成纱条干,通过合理调整工艺,可有效解决出硬头问题.     

优化细纱牵伸工艺使用压力棒隔距块的实践

为了对使用压力棒隔距块后的牵伸工艺进行优化,在分析细纱牵伸区主要工艺及其作用原理的基础上,论述了使用压力棒隔距块出现的主要问题,通过对细纱牵伸工艺的影响因素进行优化及纺纱实践,指出使用压力棒隔距块,可增大牵伸力和附加摩擦力界强度,减小浮游区长度,能够有效地降低成纱条干和千米节结数量,通过有效控制工艺,可充分发挥压力棒隔距块的功效。     

细纱机前区应用压力棒隔距块的纺纱实践

介绍了压力棒隔距块的结构及特点,分析了细纱机前区附加压力棒隔距块的作用原理.在后区为平面牵伸和V型牵伸的机型上,前区使用压力棒隔距块来进行CJ 14.5 tex纱的纺纱试验,结果表明:细纱前区附加压力棒隔距块后成纱质量都有明显改善,且平面牵伸形式改善效果更明显.指出在使用压力棒隔距块时要注意的问题,说明压力棒隔距块经济实用,是一种值得推广的新型纺纱器材.     

细纱机前区压力棒牵伸的效果及工艺优化

近年来,纺织市场竞争日益激烈,对纺织品质量的要求越来越高,设备更新以及新型纺纱器材的应用是提高成纱质量的重要途径之一.文献研究结果表明,在常见的三罗拉长短胶圈牵伸装置的前区加装压力棒即使用压力棒隔距块,有利于改善成纱质量.但应用压力棒后,改变了前区摩擦力界分布及牵伸力大小等基本牵伸条件,纺纱过程中易出"硬头",因此细纱的牵伸工艺参数必须随之进行调整.     

Repeatability of Mice Consumption Discrimination of Wheat (Triticum aestivum L.) Varieties across Field Experiments and Mouse Cohorts

Whole grain wheat (Triticum aestivum L.) foods can provide critical nutrients for health and nutrition in the human diet. Potential flavor differences among varieties can be examined using consumption discrimination of the house mouse (Mus musculus L.) as a model system. This study examines consistency and repeatability of the mouse model and potentially, wheat grain flavor. A single elimination tournament design was used to measure relative consumption preference for hard red spring and hard white spring varieties across all 3 experiments in combination with 2 mouse cohorts. Fifteen replicate mice were used in 24‐h trials to examine differences in preference among paired wheat varieties until an overall “winner” was established as the most highly preferred variety of wheat. In all 3 experiment–cohort combinations, the same varieties were preferred as the “winner” of both the hard red spring and hard white spring wheat varieties, Hollis and BR 7030, respectively. Despite the consistent preference for these varieties across experiments, the degree (magnitude) to which the mice preferred these varieties varied across experiments. For the hard white spring wheat varieties, the small number of varieties and confounding effects of experiment and cohort limited our ability to accurately gauge repeatability. Conversely, for the hard red spring wheat varieties, consumption preferences were consistent across experiments and mice cohorts. The single‐elimination tournament model was effective in providing repeatable results in an effort to more fully understand the mouse model system and possible flavor differences among wheat varieties.     

Real-Time lethality Evaluation During the Flame Sterilization of Canned Foods

A pilot-scale flame sterilizer was interfaced to a microcomputer for real-time thermal process evaluation of individual cans. The computerized system used a photodetector system to synchronize data acquisition at predetermined monitoring sites. Infrared sensors were used to measure can temperatures. Also, a method to measure can surface temperature was developed for infrared sensor calibrations. Foil thermocouples were found to be the most accurate and reliable for surface temperature measurements. However, a thin gauge wire thermocouple attached to the inside of the can end surface was a more practical and economical method for sensor calibration.     

Length of small gauge zone between cylinder and flat of a card

The length of small gauge zone (SGZ) between cylinder and flat of a card was studied mathematically. A formula to calculate the length was derived with geometry and calculus methods, by which the abscissa of the point at which the flat–cylinder gauge was minimal was obtained. The effect of heel–toe difference (HTD), cylinder radius, flat setover, minimum flat–cylinder gauge, as well as the difference between outlet gauge and minimum flat–cylinder gauge on the length of SGZ was discussed, respectively. It is concluded that a smaller cylinder radius, smaller HTD and a longer flat setover will help to lengthen SGZ. Given an appropriate value of the difference between the outlet gauge and the minimum gauge, δ, a longer SGZ will be beneficial to improving the carding intensity. But the influence of δ and the minimum flat–cylinder gauge on the length of SGZ can be ignored. The conclusion is of some theoretical value for manufacturers of textile accessories or machinery to accurately choose parameters such as cylinder radius, HTD and setover in production.     

梳棉机给棉板与刺辊隔距对梳棉质量的影响

用AFIS单纤维测试仪对不同的给棉板与刺辊隔距生产的生条质量进行了检测,结果表明:给棉板与刺辊隔距愈小,对纤维(尤其是长纤维)损伤愈严重;单纯以短绒率来表示纤维损伤可能是不全面的;给棉板与刺辊隔距愈小,对棉结和杂质去除越为有利,但对带籽屑棉结去除以隔距较大时比较有利.     

半精纺丝绒纱线毛粒控制技术

从半精纺丝绒纱线的原料入手,分析了影响丝绒产品毛粒的主要因素。在实际生产过程中,重点控制绢丝原料的毛粒和短绒率,需要控制好染色质量及拼色搭配,优化和毛工艺,达到最佳开松状态,特别选配梳理机针布,调整各梳理点的工艺隔距与速比,保证前纺各工序时原料具有较高的回潮率,加强后纺各工序的清洁工作等。各工序工艺设计要从整体上进行考虑,上下工序相互配合,上工序的产品质量为下工序打好基础,能够有效控制毛粒的产生。     

C60型梳棉机隔距参数设计理念分析

分析C60型梳棉机隔距参数设计理念.通过对比立达公司各型号梳棉机的主要工艺隔距,探讨了刺辊与给棉罗拉、除尘刀、分梳板、锡林间的隔距以及锡林与后固定盖板、活动盖板、前固定盖板、道夫等分梳元件隔距的选择方法.指出:在产量大幅提高的条件下,C60型梳棉机锡林与活动盖板隔距选择仍坚持"紧隔距、强分梳"的工艺设计思想.认为在工艺参数选择时,一定要坚持系统工程的理念,随着产量增加,锡林与道夫、刺辊间的隔距均应随之增加.     

FA224梳棉机后上罩板隔距对生条结杂短绒的影响

为了解后上罩板与锡林间的隔距对生条结杂短绒的影响,在一定的工艺设备、不同的后上罩板与锡林间隔距条件下,纺制了不同的生条.通过对这些生条的测试可知:后上罩板与锡林隔距的大小对生条质量影响明显,隔距放大后,生条中棉结、杂质降低,短绒减少,生条质量得到改善.     

改善EDTA测定糖汁钙镁盐滴定终点的研究

由于糖汁中复杂成分的干扰 ,致使传统的糖汁钙镁盐含量测定方法存在着测定终点难以准确判断 ,结果准确度和精确度不高的缺点。因此本实验研究了用CMP混合指标剂测定钙和K -B混合指标剂测定钙镁总量。结果表明 ,使用这两种混合指标剂能使滴定绺明显改善 ,获得好的准确度和精确度     

棉网清洁器除尘刀隔距对棉结和杂质的影响

为探讨棉网清洁器除尘刀隔距对生条中棉结和杂质去除效果的影响,采用USTER AFIS单纤维测试仪对两种吸风形式、两种风量和三档除尘刀隔距条件下所加工的生条进行了棉结杂质的检测,结果表明:棉网清洁器采用单侧吸风,除尘刀隔距为0.53 mm时对棉结和杂质的去除效果最好;棉网清洁器采用双侧吸风时,当风量为160 m3/h,除尘刀隔距为0.53 mm时对棉结的去除效果最好,除尘刀隔距为0.46 mm时对杂质的去除效果最好;当风量为240 m3/h,除尘刀隔距为0.46 mm时对棉结和杂质的去除效果最好,生条中棉结和杂质的数量都比原棉时有明显减少.从总体趋势上看,单侧吸风方案对棉结和杂质的去除效果要好于双侧吸风方案.     

弹簧管式压力表基本常识及调试应用技巧

通过对弹簧管式压力表工作原理等基本知识的介绍,分析了弹簧管式压力表的故障现象及调试技巧,探讨弹簧管式压力表的检定,力求弹簧管式压力表的测量数据准确,供同行们参考。