Coating Binder Migration and its Affected Parameters: Influence of Coating Color on Binder Migration

2013 ◽  
Vol 746 ◽  
pp. 110-113
Author(s):  
Zhao Hui Zhen ◽  
Zheng Shun Wang
Keyword(s):  
Coating Layer ◽  
Solid Content ◽  
Layer Surface ◽  
Coating Surface ◽  
Coating Color

The Paper studied the effects of coating color 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. In coating colors the coating solid content, the binder dosage and type affects the binder migration. The mechanism of coating color on binder migration was also studied. The results indicated that the degree of binder migration was increased with reduced the coating solid content or added more dosage of coating binder. In low dying temperature the SB-latex was prone to migrated to coating layer surface than starch, the opposite is true in high dying temperature.

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.

Research on the Coating Surface Microstructure of Coated Paper Related to Binder Migration

2014 ◽  
Vol 881-883 ◽  
pp. 1439-1442
Author(s):  
Ying Li ◽  
Wen Juan Gu ◽  
Bang Gui He
Keyword(s):  
Visual Analysis ◽  
Coating Layer ◽  
Mercury Porosimetry ◽  
Surface Microstructure ◽  
Coated Paper ◽  
Force Microscopy ◽  
Coating Surface ◽  
Atomic Force ◽  
Consolidation Phase ◽  
Coating Color

The surface topography and properties of coating layer have an important influence on penetration and distribution of the print ink. In this research, the main objective was to investigate the effect of binder migration on the coating surface microstructure. The surface microstructure was explored in the method of numerical and visual analysis using mercury porosimetry measurement, scanning electron microscopy (SEM) and atomic force microscopy (AFM). The findings indicated that the binder migration on the coating surface affected the pore size, depth and distribution of the coated paper surface. The little binder migration in the consolidation phase of coating color made a contribution to the forming of the coating layer, which made the coating surface more smother to printing performance.

Influence of Coating Binder Migration on Coated Paper Printing Properties

2013 ◽  
Vol 791-793 ◽  
pp. 286-289
Author(s):  
Zhao Hui Zhen ◽  
Zheng Shun Wang
Keyword(s):  
Cross Section ◽  
Coating Layer ◽  
Coated Paper ◽  
N Value ◽  
Coating Surface ◽  
Binder Concentration ◽  
Coating Color ◽  
Relationship Of ◽  
The Relationship

The coating binder migration and concentration in z-direction of coating layer especially in coating surface influence the coated paper printing properties. The results indicated that with the increase of coating surface binder migration, the coated paper opacity decreases, and the K&N value decreases. The relationship of K&N value and binder concentration in surface of coating layer was linear, which indicated that compared to binder dosage concentration in coating color, the K&N value and coating surface binder concentration has higher correlation. The more uniform the binder distribution in cross section of coating layer, the greater the IGT.

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.

Coating Binder Migration and Affected Parameters: Influence of Coating Process

2013 ◽  
Vol 791-793 ◽  
pp. 187-191
Author(s):  
Zhao Hui Zhen ◽  
Zheng Shun Wang
Keyword(s):  
Cross Section ◽  
Dwell Time ◽  
Coating Layer ◽  
Drying Rate ◽  
Coating Process ◽  
Coated Paper ◽  
Drying Temperature ◽  
Coating Surface ◽  
Binder Concentration ◽  
Coating Weight

The coating binder in cross-section of coating layer will be migrated, 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 coating progress 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. During coating process the drying rate, dwell time from coating device to dryer and coating weight affect the binder migration. The mechanism of binder migration was proposed. The results indicated that the degree of binder migration is directly proportional to the drying temperature and coating weight, but reduces with extending the dwell time.

Analysis of Coating Pore Structure and its Effect on Printability of Low Gloss Coated Paper

2011 ◽  
Vol 236-238 ◽  
pp. 1178-1182
Author(s):  
Yan Xin Liu ◽  
Yu Long Wang ◽  
Shen Tao Qin ◽  
Fei Fei Liu
Keyword(s):  
Pore Structure ◽  
Pore Size ◽  
Pore Volume ◽  
Coating Layer ◽  
Layer Structure ◽  
Capillary Absorption ◽  
Coated Paper ◽  
Base Paper ◽  
Small Pore ◽  
Coating Color

Coating pore structure of low gloss coated paper based on different pigment blends was analyzed using mercury intrusion method in this paper. The results show that pore size of coating layer structure of low gloss coated paper ranges from 20nm-500nm, and the range from 500nm-5000nm is mainly from base paper and interactions between coating color and base paper. Printability of coated paper can be well related with coating pore structure. Print gloss is strongly influenced by pore size and pore volume. Large pore diameters and small pore volume of coating layer structure can improve print gloss. Ink density increases with the increasing of pore diameter while the pore volume is kept constant. The increasing of pore volume of coat layer structure will improve capillary absorption and then improve ink absorption. The control of coating pore structure is very important for producing low gloss coated paper.

Fast evaluation of spatial coating layer formation using ultraviolet scanner imaging

TAPPI Journal ◽  
2015 ◽  
Vol 14 (8) ◽  
pp. 527-535
Author(s):  
WOLFGANG FUCHS ◽  
MICHAEL DAUER ◽  
ULRICH HIRN ◽  
WOLFGANG BAUER ◽  
D. STEVEN KELLER
Keyword(s):  
Coating Layer ◽  
Light Response ◽  
Print Quality ◽  
Fast Method ◽  
Layer Formation ◽  
Fast Evaluation ◽  
Fluorescent Whitening Agent ◽  
Whitening Agent ◽  
Base Paper ◽  
Coating Color

Print quality demands are steadily growing. Several print quality problems are known to be closely related to coating layer uniformity (e.g., print or gloss mottle). This study evaluates the potential for using ultraviolet (UV) scanner imaging as a fast method for characterization of the spatial coating layer formation. The method measures the visual light response of the excited fluorescent whitening agent (FWA) in the coating color. UV scanner imaging was compared to two reference methods for determining the coating layer uniformity, the burnout test, and β-radiography. Within the study, a commercially produced lightweight coated paper, a laboratory coated commercial woodfree base paper, and laboratory coated handsheets were examined. Image analysis showed that UV scanner imaging indeed reveals the coating layer formation, especially for lower coat weights. Furthermore, the influence of varying amounts of FWA in the coating color and in the base paper on the measurement results was investigated. The results indicate that UV scanner imaging of coating layer uniformity works best for coat weights below 20 g/m² and moderate FWA concentrations in the coating color.

Study on Coating Surface Topography and Properties of Coated Paper Related to Pigment

2012 ◽  
Vol 466-467 ◽  
pp. 504-507
Author(s):  
Ying Li ◽  
Bei Hai He
Keyword(s):  
Surface Topography ◽  
Surface Properties ◽  
Coating Layer ◽  
Layer Structure ◽  
Chemical Properties ◽  
Physical Structure ◽  
Coated Paper ◽  
Paper Surface ◽  
Coating Surface ◽  
Printing Ink

The physical structure and chemical properties of coating layer have an important influence on transferring and setting of the printing ink. In this study, the effect of pigment on coating layer structure and surface properties was investigated. The surface topography was explored using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The findings indicated that the pigment affected the pore size, depth and distribution of the coated paper surface. The conclusions were drawn that coating could improve coating surface topography and calcium carbonate pigment compared with kaolin pigment was not good to the paper surface properties, which resulted in high roughness, low paper gloss, high ink absorption and low paper surface efficiency.

Study on the Effect of Calender on Coating surface structure and Printability of Coated Paper

2014 ◽  
Vol 904 ◽  
pp. 46-49 ◽  
Author(s):  
Jian Guo Li ◽  
Ying Li
Keyword(s):  
Surface Structure ◽  
Visual Analysis ◽  
Coating Layer ◽  
Mercury Porosimetry ◽  
Lower Amount ◽  
Print Quality ◽  
Coated Paper ◽  
Paper Surface ◽  
Coating Surface ◽  
Printing Quality

The structure of the coating layer has a strong influence on the optical and physical properties of paper as well as on the print quality. Ink is transferred and sets onto the paper surface in the printing process, which affect printing quality and usage of ink. The objective of this experiment was to investigate the influence of calender on coating surface structure and Printability. The surface structure was explored in the method of numerical and visual analysis using mercury porosimetry measurement and scanning electron microscopy (SEM). The findings indicated that the calender treatment affected the pore size, depth and distribution of the coated paper surface. It could be concluded that Calender could increase the smoothness, gloss and paper surface efficiency of coated paper, which resulted in lower amount of ink usage, lower amount of ink absorption and higher print density.

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