Improving the inkjet codability of folding boxboard

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 145-152
Author(s):  
Peter Dahlvik ◽  
Georg Hausler
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Coating Layer ◽  
Narrow Particle Size Distribution ◽  
Coating Structure ◽  
Absorption Properties ◽  
Pigment Type ◽  
Binder Type ◽  
Coating Formulation ◽  
Printing Ink

Good inkjet printability requires a coating layer with good water absorption properties. A properly designed open coating structure helps to efficiently remove the water phase of the printing ink while controlling the penetration of the ink. The absorptivity of the coating is primarily dependent on the pigment type, as well as the binder type and amount. The pore volume of the coating layer can in principle be increased by introducing a structured pigment or a pigment with narrow particle size distribution. It is also important to optimize the binder type and level, with the aim to create a coating with higher void volume. The objective of this study was to achieve the best possible combination of sheet-fed offset and inkjet printability (i.e., one-color codability) by modifying the top coating formulation with respect to the calcium carbonate pigment type and the ratio of styrene acrylate/polyvinyl alcohol.

Investigation into Coating Surface Free Energy and Microstructure of Coated Paper Related to Pigment

2014 ◽  
Vol 884-885 ◽  
pp. 212-215
Author(s):  
Ying Li ◽  
Wen Juan Gu ◽  
Bang Gui He
Keyword(s):  
Free Energy ◽  
Calcium Carbonate ◽  
Surface Free Energy ◽  
Coating Layer ◽  
Physical Structure ◽  
Coated Paper ◽  
Paper Surface ◽  
Pigment Coating ◽  
Printing Ink ◽  
Better Than

The physical structure of coating layer have an important influence on transferring and setting of the printing ink. In this study, the effect of pigment on surface microstructure and surface free energy was investigated. The findings indicated that the pigment affected the pore size, depth and distribution of the coated paper surface. Kaolin pigment compared with calcium carbonate pigment was good to improve the paper surface smoothness. Surface free energy of kaolin pigment coating was higher than calcium carbonate pigment coating, which showed that surface wettability of coating with kaolin pigment was better than calcium carbonate pigment.

Study of Coating Binder Migration and Affected Parameters

2013 ◽  
Vol 790 ◽  
pp. 45-48 ◽  
Author(s):  
Zhao Hui Zhen ◽  
Zheng Shun Wang
Keyword(s):  
Calcium Carbonate ◽  
Cross Section ◽  
Coating Layer ◽  
Solid Content ◽  
Pigment Content ◽  
Drying Temperature ◽  
Coating Surface ◽  
Pigment Type ◽  
Binder Concentration ◽  
Coating Color

Because of the coating binder migration in cross-section of coating layer, the binder concentration will be different in z-direction of coating layer, which affect some properties of coated paper. The Paper studied the effects of pigment type, coating color solid content and dying temperature on binder migration and affected factors. The z-direction distribution of the coating binder which was tagged with Br in coating layer and its concentration in coating surface were examined quantitatively by using SEM-EDXA and ESCA analysis. The mechanism of binder migration was also proposed. The results indicated that the degree of binder migration is directly proportional to the drying temperature, that the increase of the ratio of calcium carbonate in the pigment content, coating surface binder concentration increased. The result also indicated that the degree of binder migration was increased with reduced the coating solid content.

scholarly journals Effect of Graphene Oxide on the Crystallization of Calcium Carbonate by C3S Carbonation

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2045 ◽  
Author(s):  
Dapeng Zheng ◽  
Haibin Yang ◽  
Feng Yu ◽  
Bo Zhang ◽  
Hongzhi Cui
Keyword(s):  
Particle Size ◽  
Graphene Oxide ◽  
Calcium Carbonate ◽  
Crystal Size ◽  
Particle Size Analysis ◽  
Narrow Particle Size Distribution ◽  
Size Analysis ◽  
Environmental Scanning ◽  
Calcite Crystal ◽  
Carbon Dioxide Co2

The effect of graphene oxide (GO) on the crystallization of calcium carbonate (CaCO3) is explored in this paper. Precipitation of CaCO3 was carried out by bubbling carbon dioxide (CO2) through tricalcium silicate (C3S) hydration solution with different graphene oxide admixture contents (0.2%, 1% and 2% mass ratios based on C3S). The polymorph, morphology, crystal size and particle size of CaCO3 were evaluated using X-ray diffraction (XRD), an environmental scanning electronic microscope (ESEM), and laser particle size analysis. The results showed that addition of GO was able to promote the conversion of CaCO3 to a calcite crystal phase with higher thermal stability and crystallinity than the control. However, as the dosage of GO increased, the growth of the calcite crystal particles was somewhat suppressed, resulting in a decrease in the crystal particle size and a narrow particle size distribution. When the amount of GO was 0.2%, 1% and 2%, the crystal size of the calcite was 5.49%, 12.38%, and 24.61% lower than that of the sample without GO, respectively, while the particle size of the calcite also decreased by 17.21%, 39.26%, 58.03%, respectively.

scholarly journals Effects of the Coating Mixture on the Penetration of Liquids into Paper

2019 ◽  
Vol 27 (5(137)) ◽  
pp. 160-169 ◽  
Author(s):  
Janina Leks-Stępień
Keyword(s):  
Physical Properties ◽  
Porous Structure ◽  
Strong Influence ◽  
Coating Layer ◽  
Print Quality ◽  
Liquid Penetration ◽  
Pigment Coating ◽  
Pigment Type ◽  
Printing Ink ◽  
Coating Mixture

The pigment coating of paper is usually performed to enhance the physical properties of paper and its printability. The coating generally makes paper whiter, brighter and more opaque. The properties of the coated paper depend, among others, on the porous structure of the coating developed, which is determined by the pigments, binders and their reactions. The influence of the type and quantity of coating components and ink absorption into the coating layer was studied in this work. Printing ink penetration was measured using a Penetration Dynamic Analyser with an HVL module (High Viscous Liquid). The evenness of liquid penetration into paper was measured using a Penetration Dynamic Analyser with a PEA module (Print Evenness Analyser). Results obtained indicate that all three variables – coating pigment type, latex dose and ink type – may have an equally strong influence on liquid and ink penetration,and thus on print quality.

COATING. lnfluence of the distribution of the shape and size distribution of pigment particles on cracking in coating layers during creasin

2012 ◽  
Vol 27 (4) ◽  
pp. 714-720 ◽  
Author(s):  
Peter Rättö ◽  
Joanna Hornatowska ◽  
Christophe Barbier
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Coating Layer ◽  
Narrow Particle Size Distribution ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Coating Layers ◽  
Cracking Tendency ◽  
Ground Calcium Carbonate

Abstract The crack area on a coated board was measured after creasing and folding and the crack area on a coated copy paper was measured after folding. A clay pigment and two Ground Calcium Carbonate (GCC) pigments were used. The GCC pigments differed in their particle size distribution. The binder was either an S/B Iatex or an S/B Iatex combined with starch. The type of pigment seemed to have the greatest intluence on the crack area in creased and folded board. Clay showed a !arger crack area than the GCC with a broad particle size distribution. The GCC with a narrow particle size distribution showed a considerably larger crack area than both the clay pigment and the GCC with a broad particle size distribution. The coatings containing starch generally showed a larger crack area than the coatings that only contained the S/8 latex. After the folding of the copy paper, the crack area showed a slightly different pattem. Here, it seemed that the binder was of greater irnportance than the type of pigment, with the coatings containing only latex showing a considerably lower crack area than the coatings containing starch. The coatings that were based on the clay pigment showed similar values as the coatings based on the GCC pigment with the broad particle size distribution. The coatings based on the GCC with the narrow particle size distribution showed displayed considerably higher crack areas than the coatings based on the other two pigments. The cracking tendency of the coatings, based on the GCC with the narrow particle size distributions was probably due to a greater demand for latex, i.e. smaller particles in the GCC with broad particle size distribution would probably fill in the voids and the GCC with the broad particle size distribution will therefore demand less binder. lt was further suggested that the different loadings on the coating layer during the creasing and folding of the board, compared to the folding of copy paper, explain the different results obtained with the two base-substrates.

Coating Binder Migration and Affected Parameters: Influence of Pigments and Base Paper

2013 ◽  
Vol 791-793 ◽  
pp. 192-195
Author(s):  
Zhao Hui Zhen ◽  
Zheng Shun Wang
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Coating Layer ◽  
Pigment Content ◽  
Coating Surface ◽  
Base Paper ◽  
Small Base ◽  
Binder Concentration

The Paper studied the effects of pigments and base paper on binder migration and affected factors. The z-direction distribution of the coating binder which was tagged with Br in coating layer and its concentration in coating surface were examined quantitatively by using SEM-EDXA and ESCA analysis. The results showed that the increase of the ratio of calcium carbonate in the pigment content, coating surface binder concentration increased, and coating surface binder concentration increased with the increase of particle size of pigments. The result also indicated to small base paper absorbency, coating surface has high binder migration level, the coating layer bottom (base paper direction) has low binder concentration. To high absorbency base paper, the opposite is true.

A method for measuring the in-plane compressive strength and the compression behavior of coating layers

TAPPI Journal ◽  
2011 ◽  
Vol 10 (7) ◽  
pp. 29-34
Author(s):  
TEEMU PUHAKKA ◽  
ISKO KAJANTO ◽  
NINA PYKÄLÄINEN
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Calcium Carbonate ◽  
Coating Layer ◽  
Test Methods ◽  
Coating Films ◽  
Precipitated Calcium Carbonate ◽  
Coating Color ◽  
Mineral Coatings ◽  
Styrene Butadiene

Cracking at the fold is a quality defect sometimes observed in coated paper and board. Although tensile and compressive stresses occur during folding, test methods to measure the compressive strength of a coating have not been available. Our objective was to develop a method to measure the compressive strength of a coating layer and to investigate how different mineral coatings behave under compression. We used the short-span compressive strength test (SCT) to measure the in-plane compressive strength of a free coating layer. Unsupported free coating films were prepared for the measurements. Results indicate that the SCT method was suitable for measuring the in-plane compressive strength of a coating layer. Coating color formulations containing different kaolin and calcium carbonate minerals were used to study the effect of pigment particles’ shape on the compressive and tensile strengths of coatings. Latices having two different glass transition temperatures were used. Results showed that pigment particle shape influenced the strength of a coating layer. Platy clay gave better strength than spherical or needle-shaped carbonate pigments. Compressive and tensile strength decreased as a function of the amount of calcium carbonate in the coating color, particularly with precipitated calcium carbonate. We also assessed the influence of styrene-butadiene binder on the compressive strength of the coating layer, which increased with the binder level. The compressive strength of the coating layer was about three times the tensile strength.

Particle Size, Structure and Powdering Process of Calcium Carbonate Nanoparticles Filled Powdered Styrene-Butadiene Rubber

2011 ◽  
Vol 415-417 ◽  
pp. 237-242
Author(s):  
Zhou Da Zhang ◽  
Xue Mei Chen ◽  
Guo Liang Qu
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Size Structure ◽  
Average Diameter ◽  
Rubber Matrix ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Particle Structure ◽  
Styrene Butadiene ◽  
New Particles

Calcium carbonate nanoparticles (nano-CaCO3) filled powdered styrene-butadiene rubber (P(SBR/CaCO3) was prepared by adding nano-CaCO3 particles, encapsulant and coagulant to styrene-butadiene rubber (SBR) latex by coacervation, and the particle size distribution, structure were studied. Scanning electron microscopy (SEM) was used to investigate the (P(SBR/CaCO3) particle structure, and a powdering model was proposed to describe the powdering process. The process includes: (i) the latex particles associated with the dispersed nano-CaCO3 particles (adsorption process) to form “new particles” and (ii) the formation of P(SBR/CaCO3) by coagulating “new particles”. The SEM results also shown that the nano-CaCO3 and rubber matrix have formed a macroscopic homogenization in the (P(SBR/CaCO3) particles and nano-CaCO3 dispersed uniformly in the rubber matrix with an average diameter of approximately 50 nm.

Green synthesis of submicron copper powder with narrow particle size distribution via a simple methanol thermal reduction

2021 ◽  
Author(s):  
Xiaoping Chen ◽  
Jiaqi Fu ◽  
Jiangang Li ◽  
Bohong Chen ◽  
Lei Yang ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Green Synthesis ◽  
Size Distribution ◽  
Copper Powder ◽  
Reduction Method ◽  
Particle Distribution ◽  
Thermal Reduction ◽  
Narrow Particle Size Distribution

In this work, submicron copper powder with narrow particle distribution was synthesized via a simple methanol thermal reduction method without using any surfactants. Smaller copper powder with narrower particle size...

Iron Nanoparticle Production by the Method of Electric Explosion of Wire

2021 ◽  
Vol 13 ◽  
Author(s):  
Elena Gryaznova ◽  
Alexey Pustovalov
Keyword(s):  
Particle Size ◽  
Specific Energy ◽  
Initial Conditions ◽  
High Surface ◽  
High Surface Area ◽  
Electrical Explosion ◽  
Narrow Particle Size Distribution ◽  
Magnetic Characteristics ◽  
Specific Energy Input ◽  
Iron Wire

Background: The widespread use of the iron nanopowders connected with widely range of characteristics such as size, magnetic characteristics and high surface area and that is why in the literature are present many researches of its different applications. Objective: The work studies the influence of the conditions of the iron wire electrical explosion on the course of the explosion process and the dispersed composition of the resulting metal nanopoweder. Method: Experiments on electrical explosion of iron wires were carried out in the laboratory setup with the different initial conditions of electrical explosion of the iron wire. Results: The influence of the initial wire electrical explosion conditions on the explosion regime, the specific energy input into the conductor, and the specific energy released in the arc stage of discharge are definitely determined. The empirical equations for calculation of the initial wire electrical explosion conditions for providing the critical explosion in the argon medium at a pressure of 2·105 Pa were defined. It has been established that for synthesis of iron nanopowders with a narrow particle size distribution, it is preferable to use modes with a high level of the energy released in the arc stage of the discharge. Conclusion: It was found that disabling the arc stage of the discharge during EEW leads to the decreasing of the average surface particle size by 50%.

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