苎麻牵切技术探讨

介绍了苎麻牵切原理,对苎麻梳麻条切断与牵切效果进行了对比,并研究了牵切后苎麻纤维物理机械性能的变化.结果表明:牵切对消除超长纤维和改善纤维长度均匀度的作用比切断明显,经过牵切作用,苎麻纤维的物理机械性能变化不大,牵切对苎麻纤维损伤很小.同时研究分析了牵切隔距对苎麻牵切条纤维长度指标(平均长度、长度不匀、短纤维率)的影响.     

牵切隔距与牵切条中纤维长度及其分布的关系探讨

简单介绍了牵切技术及牵切原理,主要研究了牵切隔距与三种常用化纤和苎麻的牵切条中纤维的长度及其分布的关系,结果表明,随着牵切隔距的增大,纤维的重量平均长度逐渐增大,短纤维率逐渐下降,对长度不匀影响不大。     

牵切隔距与牵切条中纤维长度及其分布的关系探讨

简单介绍了牵切技术及牵切原理,主要研究了牵切隔距与三种常用化纤和苎麻的牵切条中纤维的长度及其分布的关系,结果表明,随着牵切隔距的增大,纤维的重量平均长度逐渐增大,短纤维率逐渐下降,对长度不匀影响不大。     

苎麻牵切纺纱新工艺的初探

长期以来，我国的苎麻纺纱一直沿用1975年以后以毛纺精梳机为主要内容的老工艺，它存在着重复劳动较多、工序较繁杂、纺出的纱线质量不高、对苎麻资源浪费较严重等缺点，在一定程度上已成为苎麻纺织业继续向前发展的瓶颈。要想解决这些问题，只有在苎麻纺纱新工艺的探讨上有所突破，使牵切工艺成为苎麻纺纱业中的主角，才能基本上解决上述的问题。     

苎麻牵切纺纱新工艺的初探

长久以来，我国的苎麻纺纱一直沿用1975年以后以毛纺精梳机为主要内容的老工艺，它有着重复劳动较多、工序较繁杂、致使纺出的纱线质量不高、且对苎麻资源浪费较严重等缺点，在一定程度上已成为苎麻纺织业继续向前发展的瓶颈。我们要想解决这些问题，就只有在苎麻纺纱新工艺的探讨上有所突破，使牵切工艺成为苎麻纺纱业中的主角，才能基本上解决上述的问题。本文主要就苎麻的牵切工艺在总体概括的层次上进行了一定深度的探讨，希望能够为牵切新工艺在苎麻纺纱中全面应用的早日实现尽一份力量。     

苎麻/棉牵切纱的纺制与临界捻系数的探讨

对苎麻复精梳工艺中的苎麻预并条和头道精梳条进行牵切,然后将这两种牵切条分别与纯棉条进行条混纺纱,并对牵切、并条、粗纱和细纱各工序的工艺进行探讨.分析细纱断裂强度与捻系数的相互关系,确定了牵切纱临界捻系数在445左右,其小于同线密的苎麻/棉常规纱的临界捻系数.     

牵切羊毛的性能探讨

选用澳大利亚细支羊毛条进行牵切,制作出适合棉纺设备加工的棉型毛条.主要对羊毛牵切机的结构原理,不同牵切工艺下的毛条质量进行探讨,根据牵切毛条的质量指标,优选出最佳牵切工艺.毛条牵切工艺的创新,解决了在棉纺设备上混纺时毛纤维同其他纤维长度差异大的矛盾,为纺优质高支毛纱,生产高档毛棉织物打下了基础.     

羊毛牵切直接成条工艺与技术

选用细羊毛条进行棉型毛条的制作，主要对羊毛牵切机的结构原理、不同牵切工艺下的毛条质量进行了探讨，根据牵切毛条的质量指标，优选出最佳牵切工艺，供棉型羊毛产品的开发企业参考。     

牵切过程中纤维长度不匀率分析

 本文通过对纤维牵切过程的分析,明确了主要牵切工艺参数（牵切隔距、牵切倍数）与牵切条中纤维长度不匀的关系。牵切隔距对长度不匀率有明显影响,其影响规律与喂入长度与牵切隔距的配合有关,牵切倍数对长度不匀影响很小。研究结果揭示了牵切主要工艺参数与牵切纤维长度不匀之间的内在规律,为牵切生产工艺提供了理论依据和参考。     

摇架牵伸装置上罗拉中心距隔距规的设定和计算

牵伸装置上罗拉的中心距及其定位对成纱的条干不匀率、毛羽、断头都有较大影响。文章介绍了摇架上罗拉隔距规设定隔距的计算公式的推导过程,对棉纺厂、摇架制造厂具有指导意义。     

Analysis of ramie fiber length changes during the stretch-breaking process

Stretch‐breaking is a recent new technology proposed for ramie fiber processing. By analyzing the fiber motion and its breaking point pattern in the stretch‐breaking zone, the distribution of the fiber breaking point was estimated, and the relationship between fiber length parameters, such as average length, length irregularity, and short fiber content, and stretch‐breaking settings was constructed quantitatively. Furthermore, the factors affecting fiber length changes are discussed. In addition, the distribution of the fiber breaking point in the fiber is experimentally determined. It can be concluded that the stretch‐breaking gauge presents high correlation with the length parameters of the treated fiber. These conclusions are profoundly instructive to the practice of the stretch‐breaking technique.     

拉断机大皮辊的改造

SEYDEL679型拉断机是毛条车间的主要生产设备.目前拉断机使用的大皮辊,因工作区以外部分过长,既增加了大皮辊的刮碰现象,又分担了设备的工作压力,增加了设备负荷.同时,由于大皮辊内部的结构不合理,使其固定不好,在运转中,经常出现大皮辊轴向串动,造成因磨边而开胶,导致损坏,直接影响了大皮辊的使用寿命,因此有必要对拉断机大皮辊进行改造.     

Effect of gauge length on loop strength of sewing threads

Seam strength prediction using loop strength has been found to be more accurate and has been consistently used by researchers over last few decades. But the testing gauge length for loop strength has not been standardized as in the case of thread tensile strength. In this paper, effect of gauge length on thread tensile strength and elongation in loop form and straight form has been studied. 40 tex and 60 tex mercerized cotton and spun polyester threads are used for the study. It is observed that there is no significant change in the loop strength of the threads as the gauge length increases, whereas the tensile strength of all threads decreases with the increase in gauge length. Elongation % is found to change significantly in both loop and straight form during tensile testing. Therefore, it is concluded that loop strength tests can be carried out at any gauge length unlike tensile testing of straight threads.     

高压压浆辊线性加压对经纱上浆性能的影响

对浆纱机预压浆辊线性加压的使用效果进行分析,基于提高经纱上浆性能,对高压压浆辊通过二次切换加压方式朝着线性加压进行转变,并且分析浆纱机的监测和控制,使预压浆辊压浆效果得到提高,使浆液在纱线中得到合理浸透比例。研究发现,高压压浆辊线性加压能够使经纱上浆性能得到提高。     

给棉板与刺辊隔距对纤维长度分布的影响

用USTER AFIS单纤维测试系统,对不同给棉板与刺辊隔距条件下的生条纤维长度分布进行检测,用罗拉式纤维长度测量仪对不同给棉板与刺辊隔距的刺辊落棉、盖板花中的纤维长度分布进行了检测。结果证实,给棉板与刺辊间隔距大小对生条中的纤维长度分布有重要的影响。一般而言,隔距越大,越有利于减少纤维的损伤,其根本原因在于隔距大时,对棉束梳理长度减少,提出应以落棉和生条中的纤维长度分布来衡量分梳过程中纤维损伤情况,单纯以生条短绒率评价分梳过程中纤维损伤可能是不全面的。     

磨粉机磨辊齿型参数与功耗关系研究

通过分析磨粉机在皮磨系统研磨物料粒度与齿型参数的关系,确定邦德理论更适用磨粉机功耗关系研究。将粒径等参数带入邦德公式可知,功耗的影响因素与齿型、物料特性、磨辊速度、辊长、轧距、研磨时间和研磨前后的颗粒粒径有关。以Ⅰ～Ⅰ皮磨系统为研究对象,取轧距分别为0.8、0.6、0.4、0.2 mm,并做适当简化,运用Matlab绘出皮磨系统的功耗与齿深的关系图。由图可知,功耗随着齿辊磨损而逐渐增大。当磨损达到一定程度时,功耗变化急剧增大。由于功耗是评判磨辊是否需要拉丝或更换的重要指标,根据邦德定理从理论角度建立磨粉机功耗数学模型,为进一步研究齿辊磨损寿命与能耗关系提供理论参考。     

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.     

细纱胶辊造成机械波的分析与控制

介绍了细纱机胶辊造成的机械波的原因和机理分析,包括胶辊缺油,后区胶辊牵伸状态不良,胶辊卡簧脱落,胶辊表面损伤等,对上述造成机械波的原因采取了控制措施后,能够控制机械波的产生,保证成纱质量.