Physical dot gain of offset: Understanding and determination

2007 ◽  
Vol 22 (3) ◽  
pp. 388-393 ◽  
Author(s):  
Li Yang ◽  
Niclas Lundström
Keyword(s):  
Dot Gain

Effect of Paper’s Spectral Reflectance on the Printing’s Dot Gain

2011 ◽  
Vol 236-238 ◽  
pp. 1246-1249
Author(s):  
Chen Fei Zhao ◽  
Qing Han
Keyword(s):  
Spectral Reflectance ◽  
Color Patch ◽  
Color Reproduction ◽  
Print Material ◽  
Printing Quality ◽  
Dot Gain ◽  
Light Color ◽  
Area Percentage

Paper is the main print material, whose performance is a factor that effects the printing’s dot gain which is bad to image clarity and color reproduction. In the paper, Yule-Nielsen neugebauer spectral modal is analyzed , and the relation between paper’s spectral reflectance and the printing’s dot gain is discussed. By experiments, the paper’s spectral reflectance is adopted as correction index, which can reduce the dot gain value of the light color patch , and in the same printing conditions the dot gain is effected by the paper’s spectral reflectance, ink’s type, dot area percentage and wavelengths. The research has a certain significance for controlling printing quality and reducing the producing cost.

Parameter Study of Offset Press Cylinder Based on Sliding Friction

2010 ◽  
Vol 174 ◽  
pp. 299-302 ◽  
Author(s):  
Hai Yan Zhang ◽  
He Ping Hou ◽  
Jun Feng Si ◽  
Xiao Yu Chen
Keyword(s):  
Contact Area ◽  
Sliding Friction ◽  
Accurate Determination ◽  
Rolling Process ◽  
Elastic Cylinder ◽  
Parameter Study ◽  
Cylinder Radius ◽  
Printing Quality ◽  
Dot Gain

In the contact area of offset, a relative slide occurs between the surface of plate cylinder and blanket cylinder, which changes the print image and influences the printing quality. The relative slide in the cylinders’ rolling process is investigated, and the determination rule of cylinders’ geometric parameters of offset press is proposed. The results show that the relative slide is minimization under the condition that the compression of elastic cylinder radius is 0.2 times bigger than that of rigid cylinder radius, and the deformation of print image and dot gain both are minimization. The results provide theoretical direction for accurate determination of cylinder radius of offset press.

A Study of Color Variance between Vacuum Plate of Aluminum and Aluminum Foil Using UV Offset Printing

2012 ◽  
Vol 262 ◽  
pp. 253-257
Author(s):  
Chang Lang Chen ◽  
Mei Chun Lo ◽  
Ming Chw Wei ◽  
Shi Wei Wang
Keyword(s):  
Aluminum Foil ◽  
Packaging Materials ◽  
Offset Printing ◽  
Color Gamut ◽  
Test Form ◽  
White Board ◽  
Printing Quality ◽  
Dot Gain ◽  
Green Packaging ◽  
The Difference

In packaging market, Vacuum Plate of Aluminum by UV offset printing is light impediment effectively, moisture-proof, and forgery-proof and reaches the request of the green packaging production. Thus, the packaging of Vacuum Plate of Aluminum is used widely. This study was a true experimental research. The test form employed was the printing quality control strip from international printing specification. It was used to record and analyze the color variance between Vacuum Plate of Aluminum and Aluminum Foil with white board and no white board using UV Offset Printing. The study indicated the comparison of Tone Value Increased & the difference of Color Gamut Range among these three packaging materials via C, M, Y, K four colors tone value and RGB area testing, and results reveals that the tone value on the Vacuum Plate of Aluminum with white board increased most among these three materials; the dot gain percentage of the Vacuum Plate of Aluminum is less than 15% which with the highest stability than others. All signature findings are given in Fig.1 and Fig.2. These results are entirely consistent with research hypotheses.

Research on the Relationship between Ink Permeability and Dot Gain of Different Paper

2013 ◽  
Vol 469 ◽  
pp. 318-321
Author(s):  
Yu Xiu Wang ◽  
Guang Xue Chen ◽  
Qi Feng Chen ◽  
Jing Lei Tai
Keyword(s):  
Offset Printing ◽  
Coated Paper ◽  
Dot Gain ◽  
Printing Paper ◽  
Inkjet Printer ◽  
The Relationship

In order to research the relationship between ink permeability and dot gain of different paper, four kinds of coated paper and two kinds of printing paper were chosen. Ink marks method was used to measure ink permeability of four kinds of coated paper and two kinds of common printing paper. After the ink marks were printed on each of the six kinds of paper, the length of them were measured, then the reciprocal of the ink marks length was multiplied by 1000 to obtain the value of the ink permeability. Inkjet printer was also used to print yellow GATF step-wedge simulating offset printing on the six kinds of paper, then using an optical densitometer to measure the dot gain. Conclusion shows that non-coated paper is higher in permeability than coated paper, which results in high percentage of dot gain.

A Novel Method to Qualify the Status of Printing Process Rapidly

2010 ◽  
Vol 174 ◽  
pp. 203-206 ◽  
Author(s):  
Ying Wang ◽  
Hao Xue Liu ◽  
Min Huang
Keyword(s):  
Test Results ◽  
Single Test ◽  
Test Sheet ◽  
Solid Density ◽  
Printing Quality ◽  
Dot Gain ◽  
The Status ◽  
Density Values ◽  
Novel Method ◽  
Printing Ink

According to the characteristics of ink feeding and printing quality control principles, a new test sheet was designed for qualifying press state and the test results were discussed in this paper. This test sheet was printed under the condition that printing ink volume for different ink zone is identical. Solid density, dot gain and print contrast of different printing ink volume were simulated on a single test sheet, and thus the optimal printing status can be determined quickly. Experiment results show that this method is accessible, economic, and rapid. The optimum solid density values can be got easily for all primary colors on a single test sheet. This method is suit for the adjustment of printing status.

scholarly journals Intensity fluctuations in bimodal micropillar lasers enhanced by quantum-dot gain competition

2013 ◽  
Vol 87 (5) ◽  
Author(s):  
H. A. M. Leymann ◽  
C. Hopfmann ◽  
F. Albert ◽  
A. Foerster ◽  
M. Khanbekyan ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Dot Gain ◽  
Intensity Fluctuations

Research on Dot Gain Compensation Curve Algorithm Model

2012 ◽  
Vol 200 ◽  
pp. 627-631 ◽  
Author(s):  
Li Li Si ◽  
Feng Xian Sang ◽  
Zhen Liu
Keyword(s):  
New Method ◽  
Average Error ◽  
Dot Gain ◽  
Gain Compensation ◽  
Normal Method ◽  
Compensation Curve

To make the dot gain compensation curve more precise, this paper analyzes the methods already used and then propose a new method. We implement this new method and the old ones respectively through MATLAB, and get their dot gain compensation curves. At the same time, the average error and variance were counted to test their precision. The results show that the new method can apparently improve the precision and reduce the error. The average error of the normal method is 2.96% while it is reduce to 1.56% by the new method.

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