首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到19条相似文献,搜索用时 109 毫秒
1.
纸张白度对印刷色差的影响   总被引:1,自引:5,他引:1  
梁菊华 《包装工程》2005,26(6):48-50
纸张的差异性是造成色差的重要因素之一.在一定的测量条件下,对不同纸张的白度及印刷色差进行了测量.同时,分析了测量数据,研究了纸张色差与纸张白度的关系,并得出了纸张的色差与白度差之间不存在正向关系的结论.  相似文献   

2.
郭倩  陈广学 《包装工程》2014,35(13):139-143
目的研究不同纸张表面性能对印刷品不同阶调密度的影响程度。方法选取6种铜版纸,测量其白度、光泽度、PPS粗糙度、表面强度等纸张表面性能,用喷墨打印机在不同纸样上分别模拟印刷不同阶调的梯尺色块,通过密度计测量各印刷色块的密度,并用灰关联分析法分析实验数据。结果白度的灰关联R值较大,其次为PPS粗糙度的R值,表面强度和光泽度对不同颜色和不同阶调有不同的影响程度,且不同纸张表面性能对黄品青黑四色的影响程度不同。结论纸张白度与印品阶调的关联度较大,在实际生产中,为根据需要的印刷效果选取不同的纸张性能提供依据。  相似文献   

3.
纸张白度对印品质量的影响   总被引:6,自引:4,他引:2  
为了研究印刷纸张白度与印品质量之间的关系,采用印刷色彩学中色差公式方法,分析印刷纸张的白度性能对印品颜色再现性、色彩复制质量、印品色差之问的关系和相互的影响.促进纸张白度性能的理论研究和印刷工艺的发展.  相似文献   

4.
朱绪耀  钱军浩 《包装工程》2008,29(3):69-71,92
(续前) 2纸张特性与印品质量关系 所谓纸张特性与印品质量的关系,就是分析研究纸张具有什么样的特性,在一定的印刷条件下,能够得到什么样的印刷品.我们始终追求的是印品的最佳质量的实现,这就无疑需要研究纸张,所具有的各种特性与什么样的印刷条件相适应,即纸张的印刷适性研究.  相似文献   

5.
纸张表面性质对条形码识读率的影响   总被引:5,自引:4,他引:1  
赵东柏  王正祥 《包装工程》2003,24(2):17-18,22
通过纸张白度、平滑度和纸张与油墨亲和性对条形码识读率的影响进行分析,得出:要提高条形码的识读率,在考虑纸张的白度与平滑度的同时,更应重视纸张表面的亲和性对其的影响。  相似文献   

6.
凹版印刷的主要优点是实地墨层厚实,适合大批量产品的印刷,因此很多卷烟商标采用此印刷方式。凹版印刷中纸张是印刷最主要的承印物之一,纸张质量的优劣直接影响到印刷品的质量。不同纸张表面的光泽度、表面强度、白度、吸收性、平滑性、伸缩性等方面存在着较大的差异,即使在印刷条件相同的情况下,同一种油墨印刷在不同的纸张上也会产生不同的色彩效果。  相似文献   

7.
纸张印刷特性分析   总被引:2,自引:2,他引:0  
着重研究了纸张所具有的各种性能,以及通过对纸张的特性分析,与印刷的关系来寻求最合理的选材和印刷工艺,以求达到一个最佳的印品质量效果.  相似文献   

8.
纸张的色相与印刷品色彩再现研究   总被引:2,自引:2,他引:0  
通过实验对纸张的色相与印刷品色彩再现进行了一定的研究,并对实验数据进行了分析并寻找相应的规律。结果表明:纸张的色相与荧光增白剂和调色染料的加入量有关,同时,对印刷品亮调部分色彩复制影响较明显;纸张的光学白度和视觉白度越高,即纸张的色相越好,亮调部分各色墨的色差就越小,色彩再现就越好。  相似文献   

9.
印刷清晰度与纸张斑点对条形码识别正确性的影响   总被引:1,自引:1,他引:0  
从印刷清晰度的角度分析条码在非网点印刷过程中斑点、疵点和边缘粗糙度对识别正确性的影响,并确定了斑点、疵声、和边缘粗糙度的限制条件。对网点印刷的条码,从光信息传递角度研究条码复制过程中印刷纸张质地对条码印制质量的影响,建立评价纸张传递性质的光学传递函数。  相似文献   

10.
纸张表面效率对印刷品色彩再现的影响   总被引:1,自引:1,他引:0  
纸张的表面效率对色彩再现有很大影响,相同的彩色油墨印在不同的纸上,会产生不同效果.测量出几种不同纸张的表面效率和它们对同种油墨呈色性.分析纸张表面效率与印刷色彩再现之间关系,为印刷厂提高印品质量,选择纸张提供理论依据.  相似文献   

11.
垂直轮廓剖面迹线法测定聚合物材料断面粗糙度的研究   总被引:6,自引:0,他引:6  
运用垂直轮廓剖面迹线法测定了聚合物材料的断面轮廓线粗糙度参数RL及聚合物材料冲击强度和断口表面粗糙度参数Rs的关系。实验结果指出:聚合物的面轮廓线粗糙度与试样形状、断裂性质及断口形貌等因素有关。缺口试样断口形貌均衡分布时,试样两表面的测量值相等;断试样表面和心部测量结果相同;韧断试样表面测量结果大于心部测量结果。无缺口试样冲击脆断时,试样表面测量结果与断裂源位置有关,心部测量结果一般大于两表测量平  相似文献   

12.
The abrasive wear of ion-plated titanium nitride coatings on hardened tool steel and on hardened and plasma-nitrided tool was studied. Wear tests were made with a dry sand-rubber wheel set-up, and the initial surface roughness of the specimen was one of the test parameters.A wear mechanism for hard coatings on softer substrates under abrasive wear conditions was suggested. The wear initiates on the tops of the asperities where the base material is exposed first. Wear proceeds with the formation of craters at these sites and the growth of these crystals by fractures on the ridges formed by the coating material.The wear rate of coated steel increases with increasing initial surface roughness. A considerable increase takes place when the scale of the surface roughness is of the same order of magnitude as the coating thickness. This increase can be shifted to a higher surface roughness if a subsurface hardening process, in this case plasma nitriding, is used.  相似文献   

13.
Abstract— The influence of specimen geometry on crack growth and crack closure response was determined for BS4360 50B steel and 6082-T6 aluminium alloy. Specimens were sufficiently thick for plane strain conditions to prevail along most of the crack front. After an initial crack growth transient from the sharpened notch, and steady state conditions are attained, the growth rate and closure responses are independent of specimen geometry. At growth rates above the near-threshold regime the cyclic crack openings exceed the fracture surface roughness for the steel, but are much less than the surface roughness for the aluminium alloy. This suggests that roughness-induced crack closure plays a dominant role for the aluminium alloy but not for the steel. Finally, the effect of mean stress upon closure response is presented for the steel.  相似文献   

14.
Lu RS  Tian GY  Gledhill D  Ward S 《Applied optics》2006,45(35):8839-8847
Surface speckle pattern intensity distribution resulting from laser light scattering from a rough surface contains various information about the surface geometrical and physical properties. A surface roughness measurement technique based on the texture analysis of surface speckle pattern texture images is put forward. In the surface roughness measurement technique, the speckle pattern texture images are taken by a simple setup configuration consisting of a laser and a CCD camera. Our experimental results show that the surface roughness contained in the surface speckle pattern texture images has a good monotonic relationship with their energy feature of the gray-level co-occurrence matrices. After the measurement system is calibrated by a standard surface roughness specimen, the surface roughness of the object surface composed of the same material and machined by the same method as the standard specimen surface can be evaluated from a single speckle pattern texture image. The robustness of the characterization of speckle pattern texture for surface roughness is also discussed. Thus the surface roughness measurement technique can be used for an in-process surface measurement.  相似文献   

15.
战场条件下装备战损零部件表面清洗与预处理是装备战场应急维修或再制造过程中的重要工序,本文通过喷砂实验,采用单纯CaCO2、棕刚玉及石英砂磨料,对45钢及7A52型装甲铝合金进行喷砂处理,借助X射线应力测定仪、扫描电子显微镜(SEM)、划痕测试仪等检测设备对一定喷砂条件下喷砂后试件表面形貌、粗糙度变化及应力状态等进行测试分析。研究结果表明采用纯CaCO2磨料在试样表面喷砂后的粗糙度值较低,纯棕刚玉磨料的粗糙度值较高,采用经过混合后的磨料喷射后的表面粗糙度介于两者之间,并且经过喷砂后被喷射表面应力为压应力,对喷砂后应力状态影响的重要性次序依次是:粒径、流量、压强和距离。  相似文献   

16.
A generalized reflectance method for determination of optical properties of absorbing materials is developed and compared with other reflectance methods. In the present scheme the specimen is coated with dielectric transparent layer(s) and the reflectance ratios are measured. This novel scheme of specimen preparation and the method of measurement allow the specimen to be free from surface layers and at the same time account for possible effects of surface roughness. It can be applied to a wide variety of materials regardless of their surface conditions and is particularly useful for metals.  相似文献   

17.
Electroconductive transformation toughened ZrO2 and NbC ceramic composite was machined with an electro-discharge machining (EDM) method. Effects of EDM conditions on roughness of machined surfaces were examined. Surface damage caused during machining was evaluated with flexural strength of machined specimens. Fracture surfaces of EDMed bending specimens were observed by scanning electron microscopy (SEM).

It was observed that the strength of EDMed members was decreased with increases in pulse current, pulse duration and duty factor. Pulse duration and pulse current had a great influence on the roughness of machined surfaces. When the pulse duration was large enough, noticeable delaraination in the surface layer occurred. The highest flexural strength of an EDMed specimen attained was about 1 GPa. The X-ray diffraction patterns of surface layers were changed by machining.  相似文献   

18.
恒流微弧氧化工艺参数对膜层表面粗糙度的影响   总被引:1,自引:1,他引:0  
铝合金微弧氧化膜表面粗糙度的影响因素较多,膜表面的粗糙度对其应用有影响,过去研究甚少,为了找出改善和控制膜层表面粗糙度的方法,在恒流模式下利用双极性脉冲电源对LD10铝合金试件进行了微弧氧化处理,采用TR200粗糙度仪检测了膜层表面粗糙度,分析了加工参数对膜层表面粗糙度的影响.结果表明:在一定范围内单独缩短微弧氧化时间、减小正向或负向电流密度、提高频率、降低占空比,都有利于降低膜层表面粗糙度;但温度过高或过低都不利于降低膜层表面粗糙度,只有在30~40 ℃的工作液中处理获得的膜层表面粗糙度才最佳.在30 ℃、电流密度10 A/dm2、脉冲频率200 Hz、占空比24%时,可获得最佳表面粗糙度(Ra 1.2 μm)的硬质微弧氧化膜层.  相似文献   

19.
介绍了一种表面粗糙度标定及测量的新方法。通过标定一组标准样块的核翼比,可以实现该标定范围内待检样块的粗糙度测量,该方法稳定可靠,试验装置简单,数据处理方便,为表面粗糙度的非接触测量提供了较好的方案。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号