Colorants in printing applications

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Thomas Rathschlag
Keyword(s):  
Current Knowledge ◽  
Offset Printing ◽  
Application Systems ◽  
Printing Inks ◽  
Letterpress Printing ◽  
Flexographic Printing ◽  
The Individual ◽  
Printing Processes ◽  
Printing Ink

Abstract This review article is a summary of the current knowledge in the field of colorants in printing applications. Printing inks belong as well as paints, coatings, plastics, and cosmetic formulations to the most important application systems for colorants, both for pigments and dyes. Colorants have to meet increasing demands in printing applications due to the considerable number of printing methods and consequently of a large number of specific printing formulations. Crucial factors besides the specific properties of a certain printing ink are the processing method and the required quality of the final printed product. Amongst the most important printing methods are letterpress printing, offset printing, flexographic printing, gravure printing, screen printing, and digital printing. Different processing methods are used for coloring of the individual printing inks. The coloring processes need to be coordinated in accordance with the steps of the printing processes leading to the final product.

Colorants in plastic applications

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Gerhard Pfaff
Keyword(s):  
Current Knowledge ◽  
Review Article ◽  
Important Application ◽  
Processing Method ◽  
Application Systems ◽  
Plastic Type ◽  
Printing Inks ◽  
Cosmetic Formulations ◽  
Plastics Processing ◽  
The Individual

AbstractThis review article is a summary of the current knowledge in the field of plastic coloring. Plastics belong as well as paints, coatings, printing inks, and cosmetic formulations to the most important application systems for colorants, both for pigments and dyes. Colorants have to meet increasing demands in plastic applications due to the growing number of polymers with specific properties. Crucial factors besides the plastic type are the processing method and the required fastness level. Among the most important polymers for coloring with pigments and dyes are polyolefins, polyvinyl chloride, polyurethane, polyamide, polycarbonate, polyester, and elastomers. Different processing methods are used for coloring of the individual plastics. The coloring processes need to be coordinated in accordance with the steps of the plastics processing leading to the final product.

scholarly journals COMPARISON OF OFFSET PRINTING INK QUALITY ON THE MARKET

KREATOR ◽  
2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Romi Kusbani ◽  
Tedy Taviantoa ◽  
Yessy Yerta Situngkir ◽  
Mawan Nugraha
Keyword(s):  
Quality Data ◽  
Offset Printing ◽  
Drying Time ◽  
Quality Study ◽  
Printing Ink ◽  
Time Density

Ink quality study have been observed on ink products in the market as a right confirmation of ink users for printint production. The study is also conducted to ensure the suitability of the ink with the printing materials and machines used by consumers. The observation was conducted on two brands of ink from the same manufacturer. The quality data studied were viscosity, spreadability, drying time, density and L*a*b. The results show that, although both inks are produced by the same manufacturer and are intended for the same market, there are differences in quality, namely one has a higher viscosity and a faster drying time than the other.Keywords—quality of printing ink, viscosity, spreadability, drying time, density and L*a*b

Formation of the Printing Elements in the Photopolymer Material Used in Flexography

2014 ◽  
Vol 611-612 ◽  
pp. 883-891 ◽  
Author(s):  
Sanja Mahovic Poljacek ◽  
Tamara Tomasegovic ◽  
Tomislav Cigula ◽  
Miroslav Gojo ◽  
Diana Milcic
Keyword(s):  
Laser Ablation ◽  
Polymer Material ◽  
Major Influence ◽  
Printing Plate ◽  
Starting Point ◽  
Reproduction Process ◽  
Flexographic Printing ◽  
Printing Ink

Starting point of this paper is photopolymer printing plate used for flexographic printing. It is used for transfer of the printing ink onto the printing surface during the reproduction process. Photopolymer printing plate consists of several layers: polyester basis, photo sensitive polymer material and LAMS - Laser Ablation Mask. In the platemaking process the photosensitive material, which will form a printing plate, has to be several time exposed to different radiation in order to obtain a functional printability performance. LAMS layer has a role of masking in the exposure process. Upon pre-exposure, LAMS layer has to be removed by laser ablation only at the surfaces where photopolymer printing plate needs to be exposed. After ablation the exposures to UV lights follows and the plate will be finished with chemical removal of the unexposed parts of the polymer. Functionality of the finished printing plate has to be characterised and monitored in every procedure step because the formed image element on the printing plate has a major influence on the quality of the finished printed product. In this paper observing of the changes in the polymer material which is caused by exposure through LAMS layer will be performed. The aim is to measure the surface openings on the LAMS mask and to measure surface coverage (image elements) on the polymer material formed by exposure through the LAMS. Measuring will be made by image analysis software based on microscopic images of the control fields of differing halftone values. It is assumed that there will be a correlation between the LAMS openings and formed image elements on the printing plates. Preliminary results indicate that certain differences in image elements can be detected and are probably the consequence of the different amount of irradiated surface of the polymer material. Since the polymer material which forms the printing plate should be stable in the graphic reproduction process, results of the paper will explain the influence of UV exposures on polymerisation process and on the functional printability performance of the plates.

Basics of flexography

2021 ◽  
Author(s):  
Rostislav Moginov ◽  
Ekaterina Nadirova ◽  
Yaroslav Dmitriev
Keyword(s):  
Higher Education ◽  
Bachelor's Degree ◽  
Practical Work ◽  
Federal State ◽  
Educational Standards ◽  
Printing Technology ◽  
Flexographic Printing ◽  
State Educational ◽  
Printing Processes

The textbook deals with the theoretical and practical issues of flexographic printing technology. Much attention is paid to prepress and printing processes. Data on the adhesion of flexographic inks are presented, and theoretical and practical issues affecting the quality of printing are presented. Meets the requirements of the federal state educational standards of higher education of the latest generation. It is intended for teaching students of higher education institutions in the discipline " Flexographic printing technology "in the direction of bachelor's degree 29.03.03 and master's degree 29.04.03" Technology of printing and packaging production", can be used in practical work by specialists of printing enterprises and publishing organizations.

scholarly journals Osteoporosis in Rett Syndrome: A Study on Normal Values

2006 ◽  
Vol 6 ◽  
pp. 1619-1630 ◽  
Author(s):  
Lilit Zysman ◽  
Meir Lotan ◽  
Bruria Ben-Zeev
Keyword(s):  
Rett Syndrome ◽  
Bone Strength ◽  
Significant Positive Correlation ◽  
Normal Values ◽  
Current Knowledge ◽  
Young Age ◽  
Pathological Fractures ◽  
Primary Caretakers ◽  
The Individual

Osteoporosis is the reduction of calcium density in bones, usually evident in postmenopausal females, yet the tendency for osteoporosis can also be identified at a young age, especially in patients with chronic diseases, disabilities, and on chronic anticonvalsant treatment. Individuals with Rett syndrome (RS) have been found to show signs of osteoporosis at a young age. This condition may cause pathological fractures, inflict pain, and seriously damage mobility. In such cases, the quality of life of the individual and her primary caretakers will be severely hampered. This article reviews the current knowledge of the phenomenon and suggests some clinical directions for the individual with RS who shows signs of osteoporosis. The article also presents novel findings from a screening test of bone strength in 35 individuals with RS at different ages using the Sunlight Omnisense 7000P ultrasound apparatus. The primary results from this investigation showed a strong and significant positive correlation between calcium intake and bone strength (p< 0.0001) as well as bone density Z values (p< 0.005). The occurrence and frequency of fractures were found connected with reduced bone strength in measurements of both the radius (p< 0.0001) and the tibia (p< 0.004) as well as with negative bone strength Z values (p= 0.03). Other findings specified within the content of the article support the implementation of a comprehensive antiosteoporotic preventive management for this population.

scholarly journals Preventive maintenance features specific to offset printing machines

2021 ◽  
Vol 343 ◽  
pp. 08012
Author(s):  
Emilia Bălan ◽  
Liviu Berculescu ◽  
Răzvan-George Răcheru ◽  
Dorin Vasile Piţigoi ◽  
Lucia Adăscăliţa
Keyword(s):  
Preventive Maintenance ◽  
Offset Printing ◽  
Printing Process ◽  
Machine Performance ◽  
Continuous Quality ◽  
Study Results ◽  
Maintenance Activities ◽  
Printing Processes

In the printing industry, where production never stops, it is very important to continuously maintain machine performance. If a machine breaks down, the production will stop and it will disturb the production process. Therefore, the maintenance system must be managed efficiently to solve those problems. The paper presents the study results on continuous quality improvement of offset printing using preventive maintenance features. Offset printing is a process that involves a multitude of variables, independent and interdependent factors. The offset printing process was analyzed and the factors that have a significant influence on the quality of the process and the products made were identified. The defects that may occur during the printing process and the causes thereof have also been identified and the types of non-conformities of the end products were estabilished. The experimental method was used. The case study was conducted on Manroland 508. For the planning of preventive maintenance activities, the duration of the maintenance works necessary to ensure the proper functioning of the offset printing machines was established. Finally, maintenance activities that would guarantee and continuously improve the quality of the printing processes and the printed products were issued.

Metal effect pigments

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Gerhard Pfaff ◽  
Michael R. Bartelt ◽  
Frank J. Maile
Keyword(s):  
Construction Materials ◽  
Application System ◽  
Metallic Particles ◽  
Application Systems ◽  
Specific Composition ◽  
Printing Inks ◽  
Copper Zinc ◽  
The Stability ◽  
The Individual ◽  
Metal Effect

Abstract Metal effect pigments are luster pigments consisting of platelet-like metallic particles, mostly of aluminum (so-called silver bronzes), copper, copper/zinc (so-called gold bronzes), and zinc flakes. After parallel orientation in their application medium, they show a metal-like luster by reflection of light at the surface of the flat metal particles in one direction. Thus, the pigment particles act similar to small mirrors and lead when orientated parallel in the application system to a reflecting metal luster (metallic effect). Metal effect pigments are used in all relevant application systems such as coatings, paints, plastics, artist paints, cosmetics, printing inks, leather, construction materials, paper, glass, and ceramics. Specific composition, particle size distribution and surface quality determine the coloristic and application technical properties of the individual pigments. Many pigments are coated with a specific surface treatment to improve the quality concerning the stability and the compatibility with the application system. Metal effect pigments are offered in form of powders, pastes, pellets, suspensions or color concentrates. They are manufactured starting from a metal granulate (grit), which is ground under formation of flakes.

Colorants in building materials

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Gerhard Pfaff
Keyword(s):  
Building Materials ◽  
Current Knowledge ◽  
Construction Materials ◽  
Review Article ◽  
Important Application ◽  
Inorganic Pigments ◽  
Application System ◽  
Application Systems ◽  
Printing Inks ◽  
Cosmetic Formulations

AbstractThis review article is a summary of the current knowledge on colorants in building materials, respectively, construction materials. Building materials belong as well as paints, coatings, plastics, printing inks, and cosmetic formulations to the most important application systems for colorants. The only relevant colorants used in building materials are inorganic pigments. These have to meet high demands with regard to color and stability in the application system, especially in concretes. Different processing methods are used for coloring of cement, respectively, concrete. The coloring processes need to be coordinated in accordance with the steps of the processing leading to the final building materials.

Semi-automated methods for 3-D reconstruction of macromolecular complexes

1995 ◽  
Vol 53 ◽  
pp. 42-43
Author(s):  
B. Carragher ◽  
M. Whittaker
Keyword(s):  
Three Dimensional ◽  
Time Saving ◽  
Macromolecular Complexes ◽  
Symmetry Properties ◽  
Dimensional Reconstruction ◽  
Experienced Operator ◽  
Projection Images ◽  
The Individual ◽  
Natural Symmetry

Techniques for three-dimensional reconstruction of macromolecular complexes from electron micrographs have been successfully used for many years. These include methods which take advantage of the natural symmetry properties of the structure (for example helical or icosahedral) as well as those that use single axis or other tilting geometries to reconstruct from a set of projection images. These techniques have traditionally relied on a very experienced operator to manually perform the often numerous and time consuming steps required to obtain the final reconstruction. While the guidance and oversight of an experienced and critical operator will always be an essential component of these techniques, recent advances in computer technology, microprocessor controlled microscopes and the availability of high quality CCD cameras have provided the means to automate many of the individual steps.During the acquisition of data automation provides benefits not only in terms of convenience and time saving but also in circumstances where manual procedures limit the quality of the final reconstruction.

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