几种圆筒印花镍网结构与性能对比

发布时间：2018-05-02 16:24

本文选题：圆筒印花镍网 + 显微结构　；参考：《兰州理工大学》2017年硕士论文

【摘要】：圆筒印花镍网是圆网印花机中的关键性部件,在印染过程中印花镍网发生断裂将影响印花的质量和效率。因而圆筒印花镍网的使用寿命直接影响圆网印花机的正常生产,制备高性能的圆筒印花镍网是获得较大经济效益的关键。目前国际上圆筒印花镍网质量最好的当属荷兰STORK公司,该公司的圆筒印花镍网结构好、性能稳定、使用寿命长并且能够进行多次使用。国内生产圆筒印花镍网的厂家有60多家。但是到目前为止我们对圆筒印花镍网结构和性能的了解很少,仅仅局限于镍网的开孔率、厚度、表面光泽度等方面。本文通过化学成分分析、X射线衍射、扫描电镜等材料分析方法对不同目数圆筒印花镍网进行显微结构分析,并对其力学性能进行对比。结果表明:圆筒印花镍网中镍含量达99.69%且为典型的面心立方结构;随着镍网目数的增加,镍网的网孔形状由六边形结构转变为圆形结构,并且镍网的网孔大小和网孔间距均减小;STORK镍网的一镀镀层和二镀镀层均发生了分层现象,并且镀层出现环状生长更致密,而国内镍网均只在二镀镀层发生分层现象,环状生长相对疏松;不同种类的圆筒印花镍网的晶粒取向不同,国内A公司125目镍网和STORK公司125目镍网晶粒无明显的择优取向。国内A公司除了125目镍网以外的其他目数镍网均呈明显的(200)晶面择优取向,国内B公司镍网105目和125目镍网均表现为(200)晶面择优取向;国内A公司六种试样断口形貌均由大小不等的等轴韧窝组成,105目和125目镍网试样出现了独特的扁平状断口,说明该试样的一镀镀层和二镀镀层的结合性良好,塑性较好;由于氧化膜的存在,一镀镀层与二镀镀层之间的结合性能较差,导致拉伸过程中镀层界面产生开裂,影响镍网性能。根据圆筒镍网的刚度计算方法,选择了最佳测量长度为300mm,并且对不同目数镍网进行刚度测量,国内A公司125目镍网的刚度值为K=1.299×10-2 N·mm-1,优于其他目数镍网。
[Abstract]:Nickel screen for cylindrical printing is a key part in circular screen printing machine. The quality and efficiency of printing will be affected by the breakage of nickel screen in printing and dyeing process. Therefore, the service life of cylindrical nickel screen directly affects the normal production of circular screen printing machine, and the key to obtain greater economic benefit is to prepare high performance nickel screen for cylindrical printing. At present the best quality of cylinder printing nickel screen in the world is the Dutch company STORK. Its cylinder printing nickel screen has good structure, stable performance, long service life and can be used many times. Domestic production cylinder printing nickel screen manufacturers have more than 60. But so far we know little about the structure and performance of nickel mesh in cylindrical printing, which is limited to the opening ratio, thickness and surface gloss of nickel mesh. In this paper, the microstructure of nickel screen for cylinder printing with different mesh numbers is analyzed by means of chemical composition analysis, X-ray diffraction and scanning electron microscope, and its mechanical properties are compared. The results show that the nickel content in the nickel screen for cylindrical printing is 99.69% and is a typical face-centered cubic structure, and with the increase of nickel mesh number, the mesh shape of nickel mesh changes from hexagonal structure to circular structure. The size of the mesh and the distance between the meshes of the nickel mesh are reduced. Both the single plating and the second plating layer of the nickel mesh are delaminated, and the ring growth of the coating is more compact, while in the domestic nickel mesh the delamination occurs only in the second plating layer. The ring growth is relatively loose, and the grain orientation of different kinds of nickel screen is different, but there is no obvious preferred orientation between A company 125mesh nickel mesh and STORK company 125mesh nickel mesh. In China, all the nickel mesh except 125 mesh nickel mesh have obvious preferred orientation of crystal plane, and domestic B company nickel mesh 105 mesh and 125 mesh nickel mesh all show the preferred orientation of crystal plane. The fracture morphology of six kinds of specimens in A company in China is composed of equiaxed dimples of different sizes and 125 mesh nickel mesh specimens with unique flat fracture surface, which indicates that the joint property of one plating coating and two plating coating is good, and the plasticity is good. Due to the existence of oxide film, the bonding property between the first and second plating coatings is poor, which leads to the cracking of the interface of the coating during the tensile process, which affects the properties of the nickel mesh. According to the stiffness calculation method of cylindrical nickel mesh, the optimum measuring length is 300mm, and the stiffness of different mesh nickel mesh is measured. The stiffness of 125mesh nickel mesh of A company in China is 1.299 脳 10 ~ (-2) N m ~ (-1), which is superior to other nickel mesh.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TS194.3;TG146.15

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