Branched polyglycerols as performance additives for water-based flexographic printing inks

This research analyzed the printability of compostable films commercialized in the Thai market such as PLA/PBAT and PBAT/starch; and to comply with EN 13432 standard by using flexographic water based ink. A narrow web flexographic printing press was set up and opperated. Print quality parameters such as optical density, tone reproduction, print contrast and print uniformity were investigated. Results showed that these compostable films were hydrophobic in nature, in combination with fracture and voids of substrates’ surface. Even the substrates could be printed relatively well but showed poor ink adhesion. Surface treatment, therefore, was necessary, but having limitation. Anilox line screen 700 lpi and printing speed at 30 m/min were preferable to achieve the optimum tone reproduction and print contrast. This was based on the image resolution of 133 lpi and corona dosage at 500 watt-min/m2. Images of printed samples from SEM and SPM indicated that the fracture surface and void of films could lead to decrease their printability. It was found that starch blend gave better results as being a filler of the surface roughness of the substrate..

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Salt-Responsive AM/AMPS/ATC Terpolymers as Modifiers for Rheology and Fluid Loss in Water-Based Drilling Fluid

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.765.106 ◽

2018 ◽

Vol 765 ◽

pp. 106-112

Author(s):

Yin Bo He ◽

Guan Cheng Jiang ◽

Wu Ge Cui

Keyword(s):

High Performance ◽

Drilling Fluid ◽

Fluid Loss ◽

Trimethylammonium Chloride ◽

Polymer Conformation ◽

Nacl Concentration ◽

Water Based ◽

Lower Fluid ◽

Performance Additives ◽

Potential Use

In this study, we report salt-responsive amphoteric terpolymers prepared by copolymerization of acrylamide (AM), 2-acrylamido-2-methylpropanesulfonate (AMPS) and 3-acrylamidopropyl trimethylammonium chloride (ATC), and their use as rheology and fluid loss modifiers in water-based drilling fluid (WDF). The dependence of viscosity and turbidity on NaCl concentration indicates the salt-responsiveness of terpolymers, which results from salt-induced polymer conformation changes. In the presence of large quantities of NaCl, comparing with BT/polyanioins solution, bentonite (BT)/terpolymer solution has better shear thinning and thixotropic performance as well as lower fluid loss. Morphology shows that BT/terpolymer solution with NaCl creates high-quality filtrate cake which is compact and thin. A salt-resistant WDF prepared with terpolymers is evaluated and compared with polyanioinc WDF and polyanionic sulfonated WDF. The salt-resistant WDF possesses more favorable rheology, lower fluid loss and stronger tolerance for temperature, suggesting the potential use of AM/AMPS/ATC terpolymers as high-performance additives for salt-resistant WDFs.

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Research of effects of additives in flexographic printing inks on their properties in imprints

Scientific Papers (Ukrainian Academy of Printing) ◽

10.32403/1998-6912-2018-1-56-53-60 ◽

2018 ◽

Vol 1 (56) ◽

pp. 53-60

Author(s):

Yu. A. Kukura ◽

◽

V. V. Kukura ◽

Yu. M. Holyk ◽

◽

...

Keyword(s):

Printing Inks ◽

Flexographic Printing

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Colorants in printing applications

Physical Sciences Reviews ◽

10.1515/psr-2020-0162 ◽

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.

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Deinking flexographic-printed papers: Destabilization of flexographic ink dispersions with copper compounds

TAPPI Journal ◽

10.32964/tj12.11.29 ◽

2013 ◽

Vol 12 (11) ◽

pp. 29-35 ◽

Cited By ~ 2

Author(s):

ERIC O. FERNANDEZ ◽

KEVIN T. HODGSON

Keyword(s):

Colloidal Dispersions ◽

Cupric Chloride ◽

Copper Salts ◽

Critical Coagulation Concentration ◽

Flocculation Mechanism ◽

Ph Values ◽

Copper Compounds ◽

Printing Inks ◽

Flexographic Printing ◽

Extreme Stability

Flexographic printing inks form electrosterically stabilized colloidal dispersions in water that display extreme stability at the alkaline pH values of most wastepaper deinking systems. A significant amount of U.S. newspapers are now printed using water-based flexographic inks, and the residual inks from these sources are problematic to remove in deinking plants. A successful flocculant for flexographic ink particles used in deinking plant filtrate streams requires that both the electrostatic and steric components of colloidal stabilization be eliminated simultaneously. The present study shows the advantageous characteristics of cupric chloride in achieving rapid flocculation of flexographic inks. Flocculation experiments were performed with a model ink as well as a mixture of offset and flexographic inks from recycled newspapers. The critical coagulation concentration of cupric chloride has been compared to other chloride, nitrate, and copper salts. Copper(II) chloride has been found to be significantly more effective than other such salts in achieving destabilization and aggregation of flexographic ink particles. A possible flocculation mechanism of flexographic ink particles by cupric chloride is presented.

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A New Black Water Based Ink Prepared by Chinese Traditional Materials for Screen Printing Ancient Books

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.380.69 ◽

2011 ◽

Vol 380 ◽

pp. 69-72

Author(s):

Li Xia Huo ◽

Shi Yong Luo ◽

Yong Hao ◽

Wen Cai Xu ◽

Zai Zhu Ma

Keyword(s):

Ming Dynasty ◽

Screen Printing ◽

Shanxi Province ◽

Chemical Reagents ◽

Black Water ◽

Water Based ◽

Printing Inks ◽

Modern Chemical ◽

The Temple ◽

Bone Glue

Ink is one of “the four treasures in the study”. Inks prepared by the traditional materials is usually in the form of Chinese ink and ink stick, which are unsuitable for the modern printing technology such as screen printing, offset print, gravure or flexo printing. On the other hand, modern commodity printing inks most prepared by modern chemical pigments and chemical reagents, which would emit a certain amount of pollutants. Reproduction of Chinese ancient books, if printed by using modern commodity printing inks, would lost their lasting ancient charm such as antique, quaint, hoary, vintage, archaic, etc. In the present research, a new black water based ink is prepared by Chinese traditional materials such as, Chinese wood oil soot, bone glue, borneol, musk, pepper, etc. not including any modern chemical reagents which could cause pollution of the environment. The viscosity, fineness and rheology property of the ink were characterized. As an application example, the ink is used to duplicate the Tripitaka book sample by screen printing on Xuan papers. The original is the Tripitaka printed in the Ming Dynasty and from the temple of Wutaishan, Shanxi Province, China. The Reproduce is lasting ancient charm and durable.

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