Optimization of ink consumption in screen printing within color difference limits

In semi solid design, the parameters of the quality of the printed fabric were color fastness, level of print detail, color difference, print coverage, saw-tooth effect, line sharpness etc. Actually, printed fabric quality was evaluated by these parameters. Again, print coverage, saw-tooth effect, line sharpness, etc. were examined by estimating different distances, angles etc. in printed fabric and these factors were compared with image positives. Mesh opening effect on the quality of screen printed fabric was investigated after printing the semi solid design on knit fabric using different mesh count screens and different types of the link. To print semi solid design on knit fabric different types of ink as well as non-identical mesh count was used. Then mesh screen out come on the design and form of printed fabric in screen printing was examined. For the evaluation of semi solid design effect there remains two different methods.The first one is visual assessment and another way is microscope observation. Here, to determine the probability of the amount of ink flowing by the screen, mesh opening area of every screen was considered and it was done from respective digital microscope images.

The sustainable use of natural resources is becoming an increasingly important issue today. Stone paper, produced as an alternative to cellulose-based paper from the forest, is rich in minerals and produced without cellulose and water. This study focuses on the behavior of screen-printing ink on two different papers, stone paper and coated sticker paper. Properties such as ink adhesion, rubbing resistance, optical printing ink density, ink consumption, and lightfastness were measured on these surfaces. Solvent- and UV-based inks were used, and printing was carried out on cellulose-based (coated sticker paper) and mineral-based (stone paper) paper layers using three different mesh counts (90, 120, and 140 tpc). The rubbing resistance and lightfastness of the papers were also measured. The present findings revealed that stone paper had the same printability properties as cellulose-based paper. The study concluded that using a 140 tpc mesh with both types of ink results in a high-lightfastness ink layer and lower ink consumption. UV-based inks exhibited high rub resistance across all mesh counts. Additionally, when printing with stone paper, there will be a reduction in ink consumption, thereby achieving cost savings. Based on the present findings, it was concluded that water- and oil-resistant stone paper can be considered an essential alternative in many fields, including the printing industry.

Mesh count effect on the design and quality of printed fabric in screen printing was investigated after printing dot design on knit fabric using different mesh count screens and different types of ink. The design effect was evaluated by visual assessment as well as microscopic observation. Mesh opening area of each screen type was calculated from respective digital microscope images to find the possibility of the amount of ink passing through the screen and level of print detail, produced in dot design on the screen. Also, print coverage, saw-tooth effect, line sharpness, etc. were examined by measuring different distances, the diameter of dots, etc. in printed fabric and were compared with image positives. The quality of the printed fabric was assessed by color difference, color fastness.

Fluorescent printing inks are utilized in graphic reproduction for their special visual impression. Because of their vividness, they are used for printing decorative elements and information that needs to be noticeable. In this research, the fluorescent motive was printed by screen printing technique on recycled paper substrates and a preprinted flexographic ink layer. Because of the importance of introducing eco- friendly and sustainable options and alternatives to all segments of graphic reproduction, the possibility of using recycled paper substrates for printing a special-effect ink initiated the research with specific materials presented in this paper. Two types of flexographic printing plates (one solvent-washable and one eco- friendly water-washable) with different surface properties and screen printing plates with different mesh counts were used. This research aimed to determine the influence of the basic flexographic and screen printing plate parameters on the reproduction quality of fluorescent prints on recycled paper substrates. Spectrophotometric measurements of prints, measurements of the thickness of screen-printed and flexographic layers, microscopy of details on fluorescent prints and the width of the fluorescent printed fine lines were analyzed. Furthermore, adhesion parameters were calculated between the paper substrates, printed flexographic ink and fluorescent screen-printed ink. The results of this research provide information on the interaction, compatibility and properties of layers printed by a combination of flexography and screen printing on recycled paper substrates.

The use of vaping or electronic cigarette devices (ECDs) has recently increased as an alternative to conventional tobacco smoking products. By recording the CIELAB coordinates (L*a*b*) and computing the total color difference (ΔE) values using a spectrophotometer, the effect of ECDs on contemporary aesthetic dental ceramics was investigated in this in-vitro study. A total of seventy-five (N = 75) specimens from five different (n = 15) dental ceramic materials (Pressable ceramics (PEmax); Pressed and layered ceramics (LEmax); Layered zirconia (LZr); Monolithic zirconia (MZr) and Porcelain fused to metal (PFM)) were prepared and exposed to aerosols produced by the ECDs. The color assessment was performed using a spectrophotometer at six time intervals (0 = baseline; 250-puff exposures; 500-puff exposures; 750-puff exposures; 1000-puff exposures; 1250-puff exposures; and 1500-puff exposures). By recording L*a*b* and computing total color difference (ΔE) values, the data were processed. A one-way ANOVA and Tukey procedure for pairwise comparisons were used to assess color differences between tested ceramics (p < 0.05). All test materials demonstrated significant color differences (ΔE) after exposure to vaping (p < 0.05). The LZr group displayed noticeably high ΔE values at all the distinct puff exposure intervals, with the highest ΔE value of (13.67) after 1500 puffs. The lowest (ΔE) values were observed in the PFM group after 250 and 500 puffs (0.85 and 0.97, respectively). With the exception of the group PEmax (p = 0.999), all groups produced readings of "ΔE" that indicated significant differences (p < 0.05) at various degrees of puff exposures. ECDs can noticeably alter the color of the dental ceramics affecting the esthetics of the patients. All the materials tested demonstrated significant color changes (ΔE > 3.33) above the clinically acceptable threshold, except for the PFM and PEmax group (ΔE < 3.33) which showed color stability after exposure to the ECDs.

Effect of esthetic core shades on the final color of IPS Empress all-ceramic crowns

With the development of printed electronics on application, printing technology made more and more effect on conductive electrode. The printed conductive electrode has obvious advantages that it could apply to EL, heating film element, printed microchips, flexible sensors and RFID. Due to the conductive electrode functional application, printing technology including screen printing, Inkjet printing and flexography printing usually is chosen for its green, low cost and convenient. Specially screen printing technology has widely used. Commonly the screen printing quality is related with ink viscosity, line width, printing pressure, printing speed, roughness and so on. In order to improve conductive electrode quality, the study focuses on some parameters like squeegee Shore hardness, type of mesh, mesh count and ink viscosity, etc. This study compared line width and roughness under same screen mesh count. Through high mesh count, the thinner line was printed and good conductive property was got. According to the experimental measurement of surface roughness and width, which showed ink viscosity more important than other option and the conductive electrode of nano-silver showed good bending and higher conductive ability.KeywordsPrinted electronicsRFIIDScreen printingShore hardnessRoughness

Print quality is most exclusively aspect which is observed mostly and corelated to different printing attributes. Various attributes like print density, color difference (ΔE value) and overprint trap are some crucial aspects to evaluate print quality. Print density refers thickness of ink film applied on any media, color difference provides significant mismatch between targeted and printed while evaluating print quality and overprint trap is ability to accept subsequent layer of ink on already printed ink. This research emphasizes on study of print quality and evaluation in terms of print consistency on uncoated paper using various digital print engines

With the development of the green inks, UV ink has been applicated wider and wider in the printing, packaging and the electronics industry. Based on the UV inks and screen printing process, this paper has investigated the influnce of mesh count, screen ruling, printing materials and ink viscosity on print quality by measuring the printing dot gain experimentally. The results show that the higher mesh count and more smooth printing material can induce the better dot, tone reproduction and higher printing precision. The more serious dot gain and the worse tone reproduction will induced by lower ink viscosity. The higher screen ruling cause the bigger dot gain value. Bigger rate of mesh count with screening ruling can reduce the moire phenomena.

Effect of different high-palladium metal-ceramic alloys on the color of opaque and dentin porcelain

The effect of polishing techniques on the surface roughness and color change of composite resins

This study investigates the impact of squeegee blade (natural rubber and polyurethane) and squeegee pressure on printing density in traditional textile screen printing. The research employed a 2 × 2 factorial design with two pressure levels (high and low) for each squeegee blade. Strain gauges and pressure sensors were installed to measure variations in printing density during the screen printing process. Results from statistical t-tests and two-way analysis of variance (ANOVA) reveal that the key factor affecting printing density is the squeegee blade, followed by squeegee pressure and the interaction between blade and pressure, under statistical significance (95% confidence level). Furthermore, the impact of blade on printing density varies depending on the pressure, with natural rubber squeegee blade achieving higher density values compared to polyurethane squeegee blade under both high- and low-pressure conditions. Under the same conditions, natural rubber squeegee blade exhibit smoother fluctuation in printing density, lower variation, higher tensile strength, and better printability than polyurethane squeegee blade. These findings provide empirical evidence for selecting appropriate squeegee blade and pressure settings in textile screen printing applications, potentially improving print quality and consistency across various printing scenarios.

Fracture of provisional restorations is a common clinical problem, especially for long-span fixed partial dentures (FPDs). The function and esthetic demands of anterior provisional FPDs are essential considerations. The purpose of this study was to measure the fracture load and color cha- nge of anterior acrylic resin provisional FPDs reinforced with fibers or stainless steel wire, and to evaluate the effect of different types and lengths of reinforcements on fracture load, fracture patterns, and color change of samples. A total of 70 standardized 4-unit bridges over the maxillary anterior region were fabricated with PMMA resin. These were then divided into 7 equal groups (n=10); un-reinforced samples formed the control group. The experiment samples were reinforced with different length (4, 15mm) of three types of reinforcements (stainless steel wire, FibreKor, Construct). Color was measured according to CIE L*a*b* using a colorimeter, and color differences(ΔE) were calculated between the un-reinforced and reinforced samples. ΔE value was below the specific threshold (ΔE≥3), meaning that color difference was visually perceivable. All samples were subjected to thermocycling (600×5~55°C, 1min dwell time), following which the load was applied to samples using a universal testing machine until initial fracture. The fracture load and fracture pattern were recorded and the fracture surfaces of selective samples were observed under SEM. The results revealed that the group reinforced with 15mm stainless steel wire showed the highest mean fracture load (16.98±3.45kg) and the control group exhibited the lowest value (10.31±2.37kg). Statistical analysis by two-way ANOVA analysis of variance showed that the type and length of the reinforced material significantly influence fracture load (p<.0001), fracture pattern (p<.0001), and color change (p=0.0238). We conclude that samples reinforced with 15mm stainless steel wire result in a significantly higher fracture load and greater color difference as compared with samples reinforced with fibers. The use of 15mm stainless steel wire and fibers can change the fracture patterns of samples to ones that easily repaired .

Objective: The objective of this study was to investigate the effects of liquid coloring in different dipping times and finishing procedures on color difference of precolored and liquid-colored monolithic zirconia ceramics. Materials and Methods: 240 zirconia specimens were divided according to shades of coloring liquid (A1, A2, and A3), dipping time (3, 5, and 7 minutes), and surface finishing procedures (glaze and mechanical polishing) (n=10). CIE L*, a*, and b* values of the specimens were measured and color differences (ΔE) were calculated. The data were analyzed with three-way analysis of variance (ANOVA) and Tukey HSD test (α=.05). Results: Coloring with liquids, dipping time, and finishing procedures significantly affected the CIE L*, a*, and b* values (P&amp;lt;.001). Dipping in coloring liquids decreased the a* and b* values. Higher L* values were obtained in glazing groups than mechanical polishing groups. The ΔE values among the experimental groups were varied from 7.10 to 27.52. The highest color difference was observed in 7 min dipping in A3 liquid and mechanically polished group. Conclusion: The color difference between the precolored and liquid-colored zirconia ceramics are not in acceptable limits. Dipping in coloring liquids and surface finishing affect the color of liquid-colored monolithic zirconia.

Effect of additional pressing on the color and translucency of pressable ceramic materials: An in vitro study