A New Method for Measuring the Stitch Length of Weft Knitted Fabric in a Static Environment

It is essential to measure the stitch length of weft knitted fabric in a static environment for economy and improving productivity. The image inputted was dealt with the digital image processing techniques： the paper carried out the transformation of grey scale; then removed impurities with filtering; the characteristic of the stitch structure was abstracted by using the Fourier transform technique. To obtain the stitch length more accurately, we should establish ageometric medal of the stitch lined on the digital image processing, which provides a way to transform the stitch length in the two-dimenslon space into a three-dimension space. This study provides a new methed for measuring the stitch length without damaging the fabric.

Influence of Lycra Content and Stitch Length on the Dimensional and Physical Characteristics of Lycra Back Plaited Cotton (LBPC) Single Jersey Fabrics

The physical and dimensional characteristics, i.e. course and wale spacing, stitch density, tightness factor, diameter, porosity, dimensional stability and bursting strength of single jersey knitted items containing lycra yarn with the variations in stitch length and lycra content have been examined and a detail investigation on the lycra filament has been discussed in this study. Six different samples were knitted with identical cotton and lycra yarn but different in lycra contents and stitch length. After conditioning in a controlled environment, all the samples were tested as per the established methods. After analyzing the test results, noticeable effects of variations in stitch length and lycra content on physical and dimensional characteristics of single jersey knitted fabric has been found. As smaller the stitch length and as greater the lycra content, the dimensional stability and bursting strength are better;on the other hand, the air permeability is lower.

闪色效果针织面料工艺设计与应用

在进行纬编横向夹色编织的基础上,通过分析并利用双反面组织、变线圈织物、集圈组织线圈结构的特征,设计一系列具有闪色提花效果针织织物。分析3种针织组织的三维立体结构各部分空间遮盖的特点,结合织物闪色形成的原理,总结不同组织闪色规律。根据图案设计需求,采用不同显色区域、不同组织结构比例分配进行编织,可以形成图案形态灵活、不同角度色彩变化的闪色织物效果。探讨基于不同组织结构的闪色针织面料设计案例,分析其织物风格特点,同时给出在针织服装上应用的建议。

重症颅脑损伤患者开颅手术后切口愈合不良发生的影响因素的研究

目的分析重症颅脑损伤患者开颅手术后发生切口愈合不良的影响因素。方法回顾性选取2018年4月至2021年4月宜春市第二人民医院收治的40例重症颅脑损伤经开颅手术后发生切口愈合不良的患者作为发生组;另收集本院同期收治的重症颅脑损伤经开颅手术后未发生切口愈合不良的40例患者作为未发生组。查阅并记录患者临床资料,将可能的影响因素纳入,Logistic回归分析重症颅脑损伤患者开颅手术后切口愈合不良发生的影响因素。结果发生组切口缝针距离较近、创面感染占比高于未发生组,切口长度长于未发生组,差异有统计学意义(P<0.05);两组性别、年龄、颅脑损伤原因、体重指数(BMI)、手术时间、术中出血量、头皮缝合方式、术后抗生素使用时间、切口安乐碘湿敷、术后1周白蛋白含量比较差异无统计学意义。Logistic回归分析显示,切口缝针距离较近、切口长度较长、创面感染是重症颅脑损伤患者开颅手术后切口愈合不良发生的影响因素。结论重症颅脑损伤患者经开颅手术后发生切口愈合不良可能与切口缝针距离较近、切口长度较长、创面感染相关,临床可据此制订针对性预防方案,以降低术后切口愈合不良风险。

基于MatLab图像处理技术的线圈长度测量方法

为提高针织物线圈长度测量的可靠性和自动化程度,基于MatLab程序,利用图像处理技术对扫描的针织物结构图像进行处理,通过傅里叶变换提取出反映线圈长度的特征点,经过细化等处理后,测量出线圈在平面上的投影长度(二维线圈长度),经线性回归分析得出相应的实际线圈长度(三维线圈长度)。试验和分析表明,系统所测量并计算出的线圈长度与手工测量的线圈长度之间没有显著性差异,达到了所要求的测量精度。

横机罗纹线圈长度预测模型

通过观察横机罗纹织物的编织过程,经过分析和推导,建立了预测罗纹织物线圈长度的几何模型,并将在设定条件下编织的罗纹织物线圈长度实测值与预测值进行对比,验证了该模型的可行性。结果证明:横机罗纹织物的线圈长度分别与压针深度和齿口距呈较好的线性关系;根据所建模型,可以对普通横机机头上成圈三角位置的刻度重新进行设置,从而解决所标刻度与压针深度不一致的问题,并确立罗纹织物的线圈长度分别与压针深度和齿口距一一对应关系,既方便于生产时的调节,又能快速确定线圈长度,为生产用纱预算及成本核算提供了参考。

一种新的静态测试线圈长度的方法

静态测试纬编针织物的线圈长度对降低成本、提高生产效率是很有必要的。用数字图像处理技术将摄入的图像进行灰度变换、滤波去噪,再用二维傅里叶变换技术提取线圈长度的特征,推导出线圈长度在二维空间与三维空间内的关系转换式,进而求得纬编针织物的线圈长度。这为非破坏性测试线圈长度提供了一种新的方法。

电脑横机规定弯纱深度值与线圈长度的关系

本文通过对实验数据的分析，论述了电脑横机规定弯纱深度值与线圈长度之间的关系，并找出二者之间的关系曲线和关系式，从而为控制线圈长度提供了依据．

三维编织物的缝合连接技术研究

缝合连接三维编织技术有效地解决了制作复杂形状异型件时存在的局限性。它把三维编织工艺和缝合工艺结合起来,从而满足了工程设计和整体性的要求。本文主要探讨了缝合连接形式、缝合连接工艺参数以及它们对缝合连接强度的影响,并且对缝合连接的基本破坏模式进行了分析。本文为缝合连接三维编织复合材料的结构设计、工程应用和力学性能研究提供了基础依据,同时提出了当前研究中应解决的问题以及缝合连接三维编织复合材料的主要研究方向。

横机平针线圈长度预测模型

通过观察横机平针组织织物的编织过程,在一定假设的基础上,经过分析和推导,建立了预测平针组织织物线圈长度的几何模型,并通过在设定条件下编织出的平针组织织物线圈长度的实测值与预测值的对比研究,验证了该模型的可行性,在模型的验证中发现,横机平针组织织物的线圈长度与压针深度呈较好的线性关系.根据所建模型,可以对普通横机机头上成圈三角位置的刻度重新进行设置,解决了所标刻度与压针深度并不一致的问题,并确立平针组织织物的线圈长度分别与压针深度的线性关系,既方便于生产时的调节,又能快速确定线圈长度,为生产用纱预算及成本核算提供了依据.

缝合连接三维编织复合材料拉伸性能试验研究

研究了多种缝合方向、搭接长度和缝合密度对缝合连接三维编织复合材料拉伸性能的影响，并与三维整体编织复合材料的拉伸性能进行对比。结果表明：缝合连接三维编织复合材料与三维整体编织复合材料相比，拉伸强度下降了25％～50％，初始模量下降了35％～55％；搭接长度对拉伸强度和模量的影响较大，拉伸性能随搭接长度的增加呈现先增大后减小的特征，当搭接长度与试件宽度的比值在2．5左右时，试件的拉伸性能较好，与未缝合的三维整体编织试件相比，仅下降了25％；相对而言，中密度缝合试件的拉伸性能最优；缝合方向对试件拉伸性能的影响不明显。

双轴向经编针织物的几何结构

建立了一个适合于双轴向经编针织物的几何模型 ,由此推导出单位送经量公式 ,并计算了几种衬经衬纬经编的每横列送经量和每腊克送经量。然后 ,将理论计算出的送经量与实际情况进行了比较。验证了几何模型和送经量公式的正确性。

使用游程编码和SIMD指令集的快速图像融合

图像融合是图像拼接中的一个重要步骤,用于生成无缝的融合图像.针对当前高分辨率图像融合算法速度较慢的问题,提出一种基于多频带的快速图像融合方法.首先通过进行2遍距离变换生成一幅接缝图像,并根据这幅接缝图像生成每一幅输入图像的蒙版图像,这个过程与输入图像的次序无关,并且具有良好的可扩展性;其次使用游程编码对蒙版图像进行压缩编码,生成每一幅蒙版图像的高斯金字塔,并利用SIMD指令集生成输入图像的拉普拉斯金字塔;最后使用SIMD指令集完成拉普拉斯金字塔重构,得到一幅无缝的融合图像.在实验中对2组数据集进行测试,结果表明该方法能够高效地合成高质量的融合图像.与已有的图像融合方法相比,文中方法运行速度更快、内存使用较少、具有更好的并行性,更适合于目前的多核处理器架构.

Measuring Structural Parameters of Knitted Fabrics by Digital Image Processing Techniques

In the knitting industry the measurements of the stitch density and the stitch length are usually done manually, which may lead to lower efficiency and less definition and also bring subjective ideas into the test results. In order to improve the effect we can measure with Digital Image Processing Techniques. A piece of sample is scanned into computer and changed into a digital image, which is processed with media filtering. To acquire the power spectrum, the image in the spatial domain is converted into the frequency domain. Picking up the characteristic points describing the stitch density and the stitch length separately in the power spectra and reconstructing them, the values of the stitch density and the stitch length could be calculated. When measuring the stitch length, we should establish a geometric model of the stitch based en the digital image processing, which provides a method to transform the stitch length in the two-dimensien space into the three-dimensien space and to measure the value of the stitch length more accurately. This method also provides a new way to measure the stitch length without damaging the fabric.

Seam Damage Control and Image Analysis for Cuprammonium Fabrics

Cuprammonium fabrics are susceptible to punctuation of the sewing needle during the manufacturing processes of a garment.This type of punctuation splits the yarns in the fabrics,creates ladder-like sewing defects,and seriously affects the aesthetics of the finished garment.To minimize this seam damage,a sandwiched structure of cuprammonium fabrics with a fusible interlining was proposed to enhance the friction between the yarns in the fabrics.A measurement system was set up to evaluate the seam damage,and the effects of stitch length and seam width on the seam damage were studied.The seam damage tended to become less severe as the stitch length increased.The addition of the fusible interlining between two pieces of the fabrics could effectively suppress the seam damage.The seam margin should be below or equal to 5 mm for the stitch length of 2.0 mm.An excessive seam margin might lead to a distorted seam.

Comparative Analysis of Technical Parameters of Different Knitted Structures (Jersey, Pique and Lacoste) with or without Lycra/Spandex

The relationship of Count, GSM (Gram per Square meter), and Stitch Length, Shrinkage%, spirality% and pilling are discussed by this paper among Pique, Lacoste and Jersey knit structures with or without Lycra “3% - 5%”. For this research, we used different knitted structures, yarn count and stitch length and for finding data different types of m/c are used which are discussed later. This study is based on finish GSM of Pique, Lacoste and Jersey Knit Fabrics where various kinds of yarn count, GSM and Stitch length are used to justify the experiment. The relation of count and Stitch length with GSM is inversely proportional. When count and Stitch length increases, GSM decreases which is proved through this paper by using both the expected and experimental data. For writing this paper we have distinguished both the theoretical as well as practical implications from the industry and tried to find out adjustable points of fabrics Count, GSM and Stitch Length along with Shrinkage%, Fabric width, Spirality. This paper provides a reliable result which will help selection of count, GSM and Stitch length for making of Pique, Lacoste and Jersey knit fabrics with or without Lycra maintaining the Shrinkage%, spirality%, pilling grade in an acceptable limit. This paper logically shows that GSM, shrinkage and spirality vary when structure, yarn count, and stitch length vary.

手工刺绣工艺参数对绣品耐摩擦性能的影响分析

随着刺绣实用品的日益广泛应用,绣品表面摩擦受损的问题成了消费者关注的重点。研究了刺绣工艺参数中的针法、线迹长度、劈丝细度三项因素对绣品耐摩擦性能的影响。使用马丁代尔法对试样进行摩擦试验,并利用扫描电子显微镜和体式显微镜分析绣线和绣品的外观形态。结果表明,经一定时间的摩擦后,刺绣中的一些蚕丝单纤维会断裂或起茸,部分断裂和起茸纤维会纠缠在一起在绣品表面形成球状瑕疵或条状瑕疵。试样线迹长度越短、劈丝次数越少,绣品表面的耐摩擦效果越好。此外,不同针法的试样耐摩擦性能也会有所不同。

基于图像处理技术的纬平针织物结构参数测量

探讨了用图像处理技术测量纬平针织物的密度、纱线直径、线圈长度、未充满系数和面积孔隙率等结构参数值,通过对织物图像运用灰度化、中值滤波、二维小波变换等算法,提取出波峰点,进而求得密度、直径等参数值;同时与人工测量的结构参数值对比,表明该技术可快速、准确地实现针织物结构参数的测量。

工艺参数对织物基刺绣传输线的直流电阻的影响

针对影响刺绣传输线性能的刺绣工艺参数,从针迹类型、针迹间距、针迹长度及刺绣张力等方面,对刺绣传输线的直流电阻进行测试和分析,结果表明:针迹类型、针迹间距、针迹长度及刺绣张力对刺绣传输线的直流电阻均有显著影响,其中,针迹间距对刺绣传输线直流电阻的影响最为显著。

针织服装浮雕效果的创新型设计与制作

立体造型的成型类针织服装对服装市场的时尚引领作用日益明显,浮雕作为一种特殊的立体效果也备受人们喜爱。文章总结了传统的针织服装浮雕效果的形成方法,主要有印花、采用不同的组织结构、采用不同的纱线三种,并在此基础上提出创新型方法。利用电脑横机进行成型类针织服装衣片的编织,在进行M1 PLUS编程时,通过改变衣片花型部分工艺行的线圈长度来形成浮雕效果,并依此法进行实践创作。与传统方法相比,该新型方法操作简便,节能环保,舒适性高,市场前景广阔。