The Changing of Deformation Properties of Flexo Plates in the Process of Swelling in Solvents

Konyukhov, V. Yu.; Komarova, Liudmila; Rekus, Irina

doi:10.4028/www.scientific.net/msf.1031.75

Cited by 2 publications

(3 citation statements)

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“…Previously, the swelling of monolithic polymer plates (printing plates which are widely used in the flexographic printing method) in solvents of various chemical compositions was studied, followed by a mathematical analysis of the sorption kinetics [ 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…The kinetic curve of the sorption of liquids by the composite in units of mass makes it possible to determine the swelling rate constant k and the coefficient of diffusion of the liquid into the composite D [ 11 ]. Analysis of the thermodynamics of the liquid–polymer interaction enables the calculation of the change in the Gibbs energy during blanket swelling Δ G or the Flory–Huggins parameter for a multicomponent polymer system χ [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Compression Relaxation of Multi-Structure Polymer Composites in Penetrating Liquid Medium

et al. 2022

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Multi-structural polymer composites are widely used in the mechanical engineering, automotive, aviation and oil refining industries, as well as in the printing industry as a shock-absorbing deckle on the offset cylinders of printing machines. During offset printing, composites come into contact with inks and washing solutions, the components of which penetrate the material and cause the polymers to swell. This process degrades the print quality, and for this reason the study of its features is relevant. The prerequisites for this work are the study of the fundamental laws of diffusion and sorption of liquids by polymers with different micro- and macro-structures in different physical states and in different forms (e.g., films, sheets, fibers and fabrics). The combination of polymer materials in the composition of multi-structural fabric blankets makes it possible to obtain materials with unique mechanical properties and high resistance to liquid penetrating media and to use them in high-tech processes of multi-color printing with high resolution and color rendering. This article reports for the first time the kinetics and thermodynamics results obtained from the swelling of multi-structural polymeric blankets in solvents used in printing, and the effect of sorption of different polar liquids on the viscoelastic strain under compression during the operation of the damping systems of printing machines. Using mathematical models of activated liquid diffusion in polymers and deformation of a viscoelastic body, the swelling rate constants, solvent diffusion coefficients (the kinetic characteristics of the swelling process) and Flory–Huggins parameters (the thermodynamic characteristics of the interaction of the solvent with the composite) for composite–solvent systems with several chemical composition variants were determined. The elastic modulus and the viscosity coefficient of the composite under liquid saturation were calculated based on the experimental cyclic compression data. The range of change in the compression and restoration times of the polymeric blankets (0.09 s ÷ 0.78 s) was determined. It was shown that the composite swelled to a limited extent in all the studied liquids. All solvents used were thermodynamically poor (χ > 0.5). It has been established that rubber–fabric blankets coated with nitrile rubber are the least resistant to the action of dichloroethane, and that blankets with layers of polyolefins are not resistant to ethyl acetate. Water significantly affects the physicochemical properties of rubber–fabric blankets with a large proportion of cotton fabric layers. The data obtained can serve as a basis for optimizing the compositions of inks and cleaning solutions, as well as a theoretical basis for the thermodynamics of composite–solvent systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compression Relaxation of Multi-Structure Polymer Composites in Penetrating Liquid Medium

et al. 2022

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“…One of the most widespread printing plate manufacturing processes is based on the Laser Ablative Mask System (LAMS) technology, and its characteristic is the rounded top of the dot [11]. Printing plates come into contact and interact with various liquid media during their processing and operation, resulting in plate swelling [12]. Swelling alters the plate deformation properties and thus has an effect on increasing the tonal values in the print.…”

Section: Introductionmentioning

confidence: 99%

Determining the Print Quality Due to Deformation of the Halftone Dots in Flexography

Valdec

Hajdek

Vragović³

et al. 2021

Applied Sciences

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This paper researches the issues related to the print quality in flexography, especially the influence of the print run and inadequate printing settings on dot deformation. Dot deformation can lead to inconsistencies in print quality, such as a loss of highlight tones or an unpredictable increase in tonal value. This research was conducted on two concrete examples of flexible packaging printed on transparent films. All significant parameters of dot deformation were evaluated, including dot coverage, dot sharpness and the uniformity of the ink density. The increase in the coverage values in the midtones was linear throughout the entire print run, while in the light tones, it was more logarithmic. The overall percentage deviations from the reference value were 6.3% in the midtones and 52.6% in the light area. The increase in dot coverage was due to the wear of the polymer plate, which caused the side shoulders of the dot to become a part of the printing surface. An analysis of the ink density showed a much more homogeneous shape of the dot at the beginning of the print run. The correct ratio of the anilox roller line screen to the line ruling of the printing plate is important in order to ensure a minimum dot size in print.

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The Changing of Deformation Properties of Flexo Plates in the Process of Swelling in Solvents

Cited by 2 publications

References 1 publication

Compression Relaxation of Multi-Structure Polymer Composites in Penetrating Liquid Medium

Compression Relaxation of Multi-Structure Polymer Composites in Penetrating Liquid Medium

Determining the Print Quality Due to Deformation of the Halftone Dots in Flexography

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