scholarly journals Influence of Printing Substrate on Quality of Line and Text Reproduction in Flexography

2021 ◽  
Vol 11 (17) ◽  
pp. 7827
Author(s):  
Dean Valdec ◽  
Krunoslav Hajdek ◽  
Igor Majnarić ◽  
Darijo Čerepinko
Keyword(s):  
Quality Parameters ◽  
Print Quality ◽  
Scientific Contribution ◽  
Coated Paper ◽  
Test Form ◽  
Oriented Polypropylene ◽  
Analysis Of Results ◽  
Uncoated Paper ◽  
Surface Spread

This study characterizes and compares the parameters of the quality reproduction of fine elements in flexography on coated and uncoated paper as well as on OPP film (oriented polypropylene). A monochrome test form was created and printed using cyan UV ink. The analysis of results confirms the importance of interaction between the printing substrate and ink; it also indicates identical line and text deformations on the print. Quality reproduction on coated paper is higher in relation to OPP film for all the research parameters. The ink penetrates significantly more and with more irregularity into the pores and throats of the uncoated paper, which results in less homogeneous elements, and in such way that it loses its original shape. In coated paper and OPP film, the ink spreads more on the substrate area which gives it a significantly more homogeneous shape. However, due to the surface spread of the ink, the biggest changes in the size of fine elements are noticeable in the OPP film. The scientific contribution of this paper is based on the comparison of print quality parameters of fine elements, which can contribute to the optimization of the production process and quality of the final graphical product.

scholarly journals The Change of Printouts' Quality Depending on Pressure of a Blanket Cylinder Against an Impression Cylinder and a Plate Cylinder in Offset Machine

2014 ◽  
Vol 8 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Agnieszka Jurkiewicz ◽  
Yuriy Pyr'yev
Keyword(s):  
Optical Density ◽  
Research Method ◽  
Quality Parameters ◽  
Offset Printing ◽  
Coated Paper ◽  
Machine Manufacturer ◽  
Uncoated Paper ◽  
Two Parameters ◽  
Optimal Settings

Abstract According to lots of books, the pressure in offset printing affects the optical density and the quality of printouts. One of the quality parameters is a tone value increase. An advantage of our research method is obtaining printing effects for different pressures on one printout, thus meaning for identical printing conditions. We obtained the same printing conditions through using different amounts of underlay sheets fixed to the blanket cylinder, under a blanket. The pressure was increased from optimal settings - in accordance with the machine manufacturer’s recommendation. The test printouts were printed using Adast Dominant 515, on a coated and an uncoated paper. The optical density value was measured on the tone value scale from 10% to 100% stepping regularly by 10%. For this scale the tone value increase was computed. The research shows that for both types of paper the optical density and the tone value increase changes not very much above the optimal pressure recommended by the machine manufacturer. A difference in the optical density and in the tone value increase is bigger for coated paper than for uncoated paper. Changes in these two parameters are negligible in places where used form 0 to 4 underlay sheets and are quite significant in the place where 5 underlay sheets were.

scholarly journals ANALYZING THE EFFECT OF DENSITY VALUE DEVIATION ON PRINT QUALITY

KREATOR ◽  
2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Soebardianto . ◽  
Septia Ardiani ◽  
Romi Setiawan
Keyword(s):  
Quality Control ◽  
Quality Parameters ◽  
Quality Level ◽  
Print Quality ◽  
Machine Material ◽  
Digital World ◽  
Quality Control Parameters ◽  
Density Values ◽  
Standard Density

The quality control activities, in particular the measurement of density values, are part of the quality control parameters carried out by each company. Companies sometimes forget about the quality parameters of the name, even though the quality can give the printed products a good guarantee in the eyes of consumers. To achieve the quality level, of course, the business does not stand idle, there are several things that need to be done or provided by the business to support the quality, namely man (human), machine (machine), material (material), and method (method). In the development of technology in an increasingly advanced digital world, companies want to continue to compete with a digital world by making inroads, this of course gives the products produced by the company a good or a good level of quality. In this discussion, there is an identification of problematic aspects arising from the deviation of density values as well as ways to obtain standard density values and factors that affect the quality of prints on book cover prints using a Heidelberg machine.Keywords—Quality Control, Density, Standart, Product, Deviation

scholarly journals OPTICAL DENSITY OF YELLOW PRINTS AT COATED AND UNCOATED PAPER

2020 ◽  
Vol 7 (2) ◽  
pp. 9-13
Author(s):  
Gema Sukmawati Suryadi ◽  
Susiani Susiani ◽  
Mawan Nugraha ◽  
Balqis Azhar Ulfah Alifah ◽  
Meuthia Suryani
Keyword(s):  
Layer Thickness ◽  
Optical Density ◽  
Print Quality ◽  
Coated Paper ◽  
Optimal Density ◽  
Density Values ◽  
Print Materials ◽  
Uncoated Paper ◽  
Thickness Variations ◽  
Printing Ink

Optical Density is one of the important parameters used to control print quality. Optical density in print materials is form of interaction of ink with paper. This research is oriented to the investigation of optical density value of Yellow printing ink on coated and uncoated paper. The main purpose of this study is to analyze the effect of printing ink thickness on optimal density value. The optical density value of yellow prints obtained using densitometer measurement, printed using IGT method on coated and uncoated paper. Ink thickness variations are applied (0.8 - 9.6 μm). Density values was found to increase as the ink layer thickness increased to a certain point called the optimal density (2.4 μm ink thickness on coated paper and 4.5 μm on uncoated paper). Optical density of yellow printing ink on coated paper is higher uncoated paper, which relates to porosity on paper

Research on the Influence of Printing Pressure and Speed on Print Quality of Coated Paper

2013 ◽  
Vol 663 ◽  
pp. 286-290
Author(s):  
Ying Li ◽  
Wen Juan Gu ◽  
Bang Gui He
Keyword(s):  
Quantitative Analysis ◽  
Layer Thickness ◽  
Laser Scanning ◽  
Confocal Microscope ◽  
Print Quality ◽  
Coated Paper ◽  
Laser Scanning Confocal Microscope ◽  
Paper Surface ◽  
Printing Speed

What happens in the paper surface about ink absorption is of great important for appearance of final printing. The aim of this experiment was to investigate the influence of printing pressure and printing speed on ink layer thickness transferred onto coated paper through quantitative analysis by laser scanning confocal microscope (LSCM). Meanwhile, the influence of printing pressure and printing speed on print density and print gloss were obtained. The results implied that higher printing pressure resulted in higher ink layer thickness, print density and print gloss when printing pressure is less than 700N, but higher printing speed resulted in lower ink layer thickness, print density and print gloss when printing pressure is constant. It could be concluded that the coated paper with high printing speed compared with low printing speed resulted in lower ink absorption, lower print density, lower print gloss and worse printability on the condition of same printing pressure.

The Influence of Flame, Corona and Atmospheric Plasma Treatments on Surface Properties and Digital Print Quality of Extrusion Coated Paper

2010 ◽  
Vol 24 (3) ◽  
pp. 471-492 ◽  
Author(s):  
Mikko Tuominen ◽  
Johanna Lahti ◽  
Juho Lavonen ◽  
Tapani Penttinen ◽  
Jari P. Räsänen ◽  
...  
Keyword(s):  
Surface Properties ◽  
Atmospheric Plasma ◽  
Print Quality ◽  
Coated Paper ◽  
Plasma Treatments ◽  
Digital Print

scholarly journals DGM 430 OFFSET WEB MACHINE PRINT QUALITY

KREATOR ◽  
2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Maulana Ibrahim ◽  
Anton Hadiwibowo ◽  
Mukhyidin Djaiz ◽  
Henra Nanang Sukma
Keyword(s):  
Quality Parameters ◽  
Quality Level ◽  
Print Quality ◽  
Control Parameters ◽  
Machine Material ◽  
Control Activity ◽  
Cultural Arts ◽  
Digital World ◽  
Quality Control Parameters

The review control activity, especially the decrease in the quality of the printed output, is one of the quality control parameters carried out by each company. To get quality, of course, the company does not remain silent, there are several things that need to be done or provided by the company to be able to support quality, namely man (human), machine (machine), material (material), and methods (methods). In the development of technology in an increasingly advanced digital world, companies want to continue to compete with a digital world by making breakthroughs, this of course makes the products produced by the company have a good or good quality level. In this study, there is an identification of the problem aspects that arise from the causes of the print results and how to get solutions to overcome the problems and factors that affect the quality of the print on the printed contents of the Cultural Arts Service Book using the DGM 430 Web Offset machineKeywords— Quality, Parameters, Web Offsets

PRINTING.Paper and printer effects on xerographic print quality

2012 ◽  
Vol 27 (4) ◽  
pp. 729-738 ◽  
Author(s):  
Siying Chen ◽  
Ramin Farnood ◽  
Ning Yan ◽  
Sabina Di Risio ◽  
Jay Song
Keyword(s):  
Multivariate Analysis ◽  
Surface Characteristics ◽  
Print Quality ◽  
Paper Properties ◽  
Uncoated Paper ◽  
Visual Ranking ◽  
Two Parameters ◽  
The Impact ◽  
Paper Substrates

Abstract This study examines the impact of paper and printer type on the quality of xerographic prints. Ten different uncoated paper substrates were printed using three different commercial xerographic printers. The print quality of the samples (print microgloss, print microgloss nonuniformity, print density, print and gloss mottle, and visual ranking) and the physical and surface characteristics of the papers were measured. It was found that relationship between print mottle and print gloss nonuniformity was dominated by the printer type. While for some printers, these two parameters were positively correlated, in other cases printer appeared to "mask" variations in the paper properties. Multivariate analysis also showed that brightness, opacity, basis weight, 7 5 ° Tappi gloss, and roughness were the top five paper properties that had the most significant effect on the visual ranking and print mottle. Finally, as expected, print roughness was found to be a better predictor of the perceived print quality, however, paper roughness was poorly correlated with the visual ranking of printed samples (R2 0.5).

scholarly journals Effect of Blending Ratio of Amphoteric and Anionic Latex on Print Quality of Coated Paper.

2002 ◽  
Vol 56 (4) ◽  
pp. 543-548
Author(s):  
Yong-Kyu Lee ◽  
Kyu-Jae Park ◽  
Shigenori Kuga
Keyword(s):  
Print Quality ◽  
Coated Paper

Modification of tundish design to improve quality of slabs, casted at CCM No. 4 of EVRAZ NTMK

2020 ◽  
Vol 76 (6) ◽  
pp. 559-563
Author(s):  
I. M. Zakharov ◽  
V. A. Smirnov ◽  
D. V. Sushnikov ◽  
A. G. Lyzhin ◽  
E. A. Lavrova ◽  
...  
Keyword(s):  
Basic Number ◽  
Metal Level ◽  
Surface Layers ◽  
Secondary Oxidation ◽  
Strip Rolling ◽  
Actual Distribution ◽  
Ultrasonic Control ◽  
Analysis Of Results ◽  
Water Simulation

A technology of continuous casting of steel has a large effect on its contamination. In particular, proper organization of metal flows in tundish and mold is very important. After completion a series of casting through a tundish and drop of metal level in it, it possible, that the slag flows from the surface layers of the tundish to capture the metal. An analysis of results of ultrasonic control of finished strip showed, that the basic number of the revealed defects was obtained during strip rolling out of the last slabs of the last heat in a series for a tundish. Metallographic studies determined, that the defects were located in the slab axis zone and filled by macro-inclusions of complex composition. To determine the actual distribution of metal flows, a water simulation of them was accomplished for the existing design of the EVRAZ NTMK tundish. It was determined, that at the drop of metal level in a tundish, a capture of slag from the metal reservoir and its transfer into the main bath of the tundish takes place due to whirligig flows. Following the weight metal consumption, the zone of slag inclusions distribution enlarges. Besides, denudation of the metal mirror in the metal reservoir takes place, resulted in metal secondary oxidation. Based on the results of the simulation, it was proposed to modify the design of the “turbostop”, which is installed in the metal reservoir of the tundish. Besides, it was proposed to remove the dividers installation in the tundish. It was noted, that the proposed steps enable to ensure a minimal level of rejections.

Quality of ram spermatozoa separated with modified swim up method

2018 ◽  
Vol 33 (2) ◽  
pp. 62-70 ◽  
Author(s):  
A Hossain ◽  
MM Islam ◽  
F Naznin ◽  
RN Ferdousi ◽  
FY Bari ◽  
...  
Keyword(s):  
Semen Quality ◽  
Membrane Integrity ◽  
Quality Parameters ◽  
Fluid Medium ◽  
Normal Morphology ◽  
The Mean ◽  
Mass Activity ◽  
Fresh Semen ◽  
Artificial Vagina

Semen was collected from four rams, using artificial vagina and viability%, motility% and plasma membrane integrity% were measured. Fresh ejaculates (n = 32) were separated by modified swim-up separation using modified human tubal fluid medium. Four fractions of supernatant were collected at 15-minute intervals. The mean volume, mass activity, concentration, motility%, viability%, normal morphology and membrane integrity% (HOST +ve) of fresh semen were 1.0 ± 0.14, 4.1 ± 0.1 × 109 spermatozoa/ml, 85.0 ± 1.3, 89.4 ± 1.0, 85.5 ± 0.7, 84.7 ± 0.5 respectively. There was no significant (P>0.05) difference in fresh semen quality parameters between rams. The motility%, viability% and HOST +ve % of first, second, third and fourth fractions were 53.4 ± 0.5, 68.2 ± 0.3, 74.8 ± 0.3 and 65.5 ± 0.4; 55.5 ± 0.4, 66.2 ± 0.4, 74.5 ± 0.3 and 73.6 ± 0.3 and 66.7 ± 0.5, 66.8 ± 0.5, 65.2 ± 0.4 and 74.7 ± 0.5 respectively. The motility%, viability% and membrane integrity% of separated semen samples differed significantly (P<0.05) between four fractions. The mean motility% and viability% were significantly higher (P<0.05) in third fraction (74.8 ± 0.3%), whereas the mean HOST +ve% was significantly higher (P<0.05) in fourth fraction (74.7 ± 0.5). All quality parameters of separated spermatozoa were significantly (P<0.05) lower than that of fresh semen. The pregnancy rates were higher with fresh semen (71%) in comparison to that of separated sample (57%).Bangl. vet. 2016. Vol. 33, No. 2, 62-70

Sign in / Sign up

Export Citation Format

Share Document