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 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 Changes in the Quality of Winter Wheat Varieties in a Comparative Experiment

2003 ◽  
pp. 179-183
Author(s):  
Péter Sipos ◽  
Zoltán Győri
Keyword(s):  
Crop Production ◽  
Quality Parameters ◽  
Falling Number ◽  
Wheat Varieties ◽  
Field Crops ◽  
Gluten Content ◽  
New Varieties ◽  
Two Parameters ◽  
Winter Wheat Varieties

The hungarian seed grain supply offers more and more varieties from the field crops for public cultivation in every year. The number of the admitted varieties by state doubled from 1996 to 2001. The question is what changes can the varieties newly inproved show in the quality parameters.32 varieties admitted in different years was examined on quality parameters as wet gluten content, valorigraphic value and falling number from period 1996-2001. We established that the newer varieties surpassed the traditional varieties of the variety-comparativing experiment in accordion to they wet gluten content. In connection with formation of valorigraphical value we saw that the new varieties got place in the varieties admitted for public cultivation in quality based examining. The varieties showed different reaction of fertilizer on the formation of these two parameters. In connection with the formation of the value of falling number the examined varieties suited for the requirements of quality crop production in the experimental years excepted some of them.

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

scholarly journals A Study on the Assessment of Quality of Printed Sheets in Offset Sheet-Fed Printing 

2021 ◽  
Vol 31 (1) ◽  
pp. 41-45
Keyword(s):  
Quality Management ◽  
Total Quality Management ◽  
Quality Parameters ◽  
Low Density ◽  
Total Quality ◽  
Offset Printing ◽  
Pareto Chart ◽  
Printing Process ◽  
Ishikawa Diagram

The quality parameters of printed sheets should be controlled constantly during the sheet-fed offset printing process. This allows the detection of any problems in the initial stages of the printing process. The final control of the quality of printing sheets will eliminate error products before delivering to the costumers. The results of this control should be analyzed continuously. The total quality management (TQM) is an effective method in controlling, doing statistics, and assessing the errors in the offset printing process. Simultaneously, this method delivers the main errors frequently occurred in the printing process. This paper presents the possibility of using some tools of the TQM method such as Pareto chart, Ishikawa diagram, and 5xWhy to analyze and assess the quality of printing sheets in sheet-fed offset printing. The studied results show that the two main errors of the printed sheets are hickeys (occupied 29 %) and low density (occupied 17%). Moreover, the causes of hickey error are analyzed and shown in this paper.

Changes in microbiological parameters, pH and titratable acidity during the refrigerated and room temperature storage of dahi prepared from the milk of Vechur cows: an indigenous cattle breed of Kerala

2021 ◽  
pp. 1-4
Author(s):  
Ammiti Murali Krishna ◽  
Ligimol James ◽  
Athrayil Kalathil Beena ◽  
Sujjalur Nagesha Rao Rajakumar ◽  
Kollannur Aippunny Mercey
Keyword(s):  
Microbiological Quality ◽  
Cattle Breed ◽  
Titratable Acidity ◽  
Quality Parameters ◽  
Cow Milk ◽  
Indigenous Cattle ◽  
Microbiological Parameters ◽  
Medicinal Properties ◽  
Two Parameters

Abstract Vechur cow is an indigenous cattle breed of Kerala listed as a critical breed by FAO. This research communication is related to the hypothesis that the changes occurring in microbiological quality parameters of Vechur cow milk dahi (VCMD) during storage will be superior to other milk and reflective of the traditional concepts of therapeutic properties attributed to Vechur milk. Microbiological quality of the VCMD stored at room (30 ± 1°C) and refrigerated (4 ± 1°C) temperatures in terms of total viable, coliform, yeast and mold and lactococcal counts is reported in this study, together with titratable acidity and pH. Results are compared with cross-bred cow milk dahi (CCMD) as control. On refrigerated storage, despite the comparable initial microbiological quality, VCMD exhibited significantly lower total viable, lactic acid bacteria, yeast and mold counts than CCMD, from the fifth day onwards for the first two parameters and the tenth day onwards for the last parameter. VCMD exhibited significantly higher pH values than CCMD from the fifth day onwards whereas the titratable acidity was significantly lower from the tenth day onwards. Though this study does not delineate the factors contributing towards the lower microbial population observed in VCMD, it provides an impetus to further researches for scientifically validating its traditionally-reported medicinal properties.

scholarly journals Colour quality testing of CYAN offset prints depending on pigment concentration and different CTP screening mode

2020 ◽  
Author(s):  
Sandra Mustač ◽  
◽  
Igor Majnarić ◽  
Stanko Bauk ◽  
Slaven Miloš ◽  
...  
Keyword(s):  
Pigment Concentration ◽  
Offset Printing ◽  
High Quality ◽  
Quality Testing ◽  
Printing Technique ◽  
Pressure Cylinder ◽  
Uncoated Paper

One of the problems in the offset printing technique is the picking of uncoated paper, which occurs due to the activity of pressure cylinder and sticky offset inks. To reduce offset ink stickiness, it is possible to add cheaper ink filler that will indirectly reduce the concentration of pigment. However, there is also a reduction in the colour tones and quality of reproduction. In this experiment we used: standard cyan offset ink (Sun Lit Express ink which consists of phthalocyanine based pigment) and high-quality gloss coated cardboard (250 g/m2 Euroart plus gloss). This paper aims to show how the CTP screening type (AM/FM mode) and the CTP line screening (80, 100, 120 line/cm and 10 μm, 20 μm 25 μm diameter of print elements) manifest on the reproduction quality of a standard gradation wedge. This research will create the possibility of correlating the factors of user reduction of pigment concentration and reproduction quality of cyan colour separation. By using the AM screenings and adding different concentrations of ink filler, more stable cyan prints are achieved.

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 Back-trap mottle: A review of mechanisms and possible solutions

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 6426-6447
Author(s):  
Hak Lae Lee ◽  
Hye Jung Youn ◽  
Ming He ◽  
Jiachuan Chen
Keyword(s):  
Coating Layer ◽  
Offset Printing ◽  
Coating Structure ◽  
Paper Substrate ◽  
Coated Paper ◽  
Printing Process ◽  
Coated Papers ◽  
Coating Uniformity ◽  
Color Density

Print mottle is a serious and common uneven printing defect that occurs when printing coated paper by the offset multicolor printing process. It is characterized by a non-uniform appearance in terms of brightness, gloss, or color density that appears mostly in solid printed areas. Back-trap print mottle and water-interference print mottle occur when the quality of the paper substrate, especially the coating layer quality, is not satisfactory. To cope with this quality problem of coated papers, the understanding of the offset printing process, the requirements of coated-paper quality, and the reasons for this problem should be addressed. In this review, the basic process of offset printing and the mechanisms of print mottles were explored, the importance of coating uniformity in both the coating structure and process was reviewed, and the approaches to cope with print mottle were introduced.

Pengaruh Kualitas Pelayanan Terhadap Kepuasan Pelanggan di Kantor Perusahaan Umum Badan Urusan Logistik Kota Sampit Kabupaten Kotawaringin Timur

2016 ◽  
Vol 2 (2) ◽  
pp. 1-5
Author(s):  
Masrukin Masrukin ◽  
Hermanto Hermanto
Keyword(s):  
Quality Of Service ◽  
Customer Satisfaction ◽  
Service Quality ◽  
Error Rate ◽  
Research Method ◽  
Statistical Test ◽  
Quality Factors ◽  
Public Companies ◽  
Public Company

Customer satisfaction is influenced by service quality factors, this study aims to find out and analyze how much influence the quality of service on customer satisfaction is felt by customers who use the service of Poor Rice (Raskin) at the Office of Public Companies Logistics Agency (Perum BULOG) in Sampit City Regency East Kotawaringin. The research method used in this study is the method of observation, questionnaire/questionnaire and documentation using a Likert scale and the method of determining the sample used is the error rate of 5% as many as 213 samples. Testing the hypothesis used is a statistical test with the formula "Product moment person". The results showed that there was a very strong correlation between Service Quality and Customer Satisfaction of the Office of Public Company of the Logistics Affairs Agency (Perum BULOG) in the District of East Kotawaringin. As much as 0.9968514278 based on the calculation of Pearson Product Moment value.

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

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