Influence of Some Flexographic Printing Process Conditions on the Optical Density and Tonal Value Increase of Overprinted Plastic Films

Żołek‐Tryznowska, Zuzanna; Rombel, Maciej; Petriaszwili, Georgij; Dedijer, Sandra; Kašiković, Nemanja

doi:10.3390/coatings10090816

Cited by 13 publications

(8 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 32 ] Havlinova et al [ 33 ] has suggested the flow time in the range 18–35 s to achieve proper inking of the anilox roller in the printing units. In our previous work, [ 34 ] we observed that printing with maximum ink viscosity in industrial conditions causes some difficulties. Hence, we have chosen 31 s as a maximum flow time.…”

Section: Resultsmentioning

confidence: 99%

A comparative study of the interaction between the dried ink layer and PLA film used for packaging purposes

Izdebska‐Podsiadły

Samoraj

Blachowski

et al. 2021

Polymer Engineering & Sci

Self Cite

View full text Add to dashboard Cite

This research aims at comparing the interactions between the water‐based printing ink and polylactide (PLA) printing base. As a reference base, a polyethylene terephthalate (PET) film was chosen. The wettability of both films was investigated. The Owens–Wendt method was applied to calculate the surface free energy (SFE). The values of SFE and its polar and dispersive components were compared with the surface tension (ST) of the ink and the polar and dispersive components of ST. The wetting envelopes of the investigated PLA and PET films are presented. Finally, the bonding strength between the dried ink layer and the printing base was analyzed. The PET film exhibited higher values of SFE. However, the bonding strength between the dried ink layer and the printing base was higher for PLA films. Our results reveal that PLA films can be an excellent choice as packaging materials, with comparable or even better print quality than conventional fossil‐based plastics.

show abstract

Section: Resultsmentioning

confidence: 99%

A comparative study of the interaction between the dried ink layer and PLA film used for packaging purposes

Izdebska‐Podsiadły

Samoraj

Blachowski

et al. 2021

Polymer Engineering & Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Another way to solve this problem requires much more commitment, and it also costs more. The quality of the print is greatly determined by the preparatory work in the prepress and printing processes [35]. Image processing in prepress should be made again by using a "bump-up" curve that sets 2% as the minimum value, thus ensuring the correct ratio between the anilox line screen and the plate line ruling.…”

Section: Dot Deformation Caused By Incorrect Settingsmentioning

confidence: 99%

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

Valdec

Hajdek

Vragović³

et al. 2021

Applied Sciences

View full text Add to dashboard Cite

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.

show abstract

“…Further complications arise due to the desiccation of ink remnants within the cells, which has implications for the ceramic surface of the roll. During printing, the ink tends to dry on the base and peripheries of the anilox cells, progressively diminishing the ink capacity [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Efficiency and Anilox-Roll Condition after Ultrasonic Cleaning

Przybysz,

Lipkiewicz,

Małachowska

et al. 2023

Coatings

View full text Add to dashboard Cite

In the flexographic printing industry, anilox rolls play a pivotal role in determining ink usage. These rolls are characterized by anilox cells, which transfer ink to the final printed material. However, these rolls face wear and potential damage during their operational life, largely due to improper cleaning or debris accumulation in the ink duct. Such contamination compromises the ink capacity, impacting print quality. With the industry’s need for consistent and high-quality prints, there is a growing emphasis on the development and consistent implementation of optimal anilox-roll operation methodologies. One cleaning method gaining traction is ultrasonic cleaning. This method employs ultrasonic waves in conjunction with a cleaning agent, providing a quick, efficient, and environmentally conscious cleaning alternative. Yet, there is limited scientific data on the actual condition of anilox rolls after ultrasonic cleaning. In this study, the surface of anilox rolls post-ultrasonic-cleaning was comprehensively examined using microscopic analysis. This assessment provided insights into the method’s efficacy and potential for causing roll damage. The results showed that post-printing, rolls lost approximately 20% of their ink capacity, and ultrasonic cleaning effectively restored the ink capacity of the undamaged rolls. However, for rolls with pre-existing damage, the ultrasonic cleaning process exacerbated the damages, leading to complete delamination in some instances. This study underscores the potential of ultrasonic cleaning in restoring anilox-roll efficiency but also highlights the need for caution with damaged rolls.

show abstract

Influence of Some Flexographic Printing Process Conditions on the Optical Density and Tonal Value Increase of Overprinted Plastic Films

Cited by 13 publications

References 22 publications

A comparative study of the interaction between the dried ink layer and PLA film used for packaging purposes

A comparative study of the interaction between the dried ink layer and PLA film used for packaging purposes

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

Assessment of Efficiency and Anilox-Roll Condition after Ultrasonic Cleaning

Contact Info

Product

Resources

About