Operability coating window of dual-layer slot coating process using viscocapillary model

The slot coating process in the production of polymer films has a wide range of applications. However, the process cannot be systemized. This study used the computational fluid dynamics software Polyflow to analyze the slot coating process and investigate the influence that the process parameters have on the characteristics of thin-film coating to reduce the time and cost consumed in the experimental methods. The rheological characteristics of the non-Newtonian fluid used in this study were first identified by conducting experiments, and then configured in the simulation software for fitting with mathematical models. In addition, the models of the slot coating process were constructed, and the Arbitrary Lagrangian-Eulerian (ALE) calculation methods were then used in the Polyflow software. The simulation results were then compared to the experimental results and the findings reported in relevant literature, to determine the influence that the process parameters have on the characteristics of thin-film coating. The simulation results were represented graphically in a coating window plot. The comparison results indicate that the viscosity-shear rate characteristic of the material in the shear rate range of optical film coating is an excellent fit for the Cross Law. When the coating speed is too high or the amount of fluid supply is insufficient, phenomena such as break lines, uneven thickness, and air entrainment can occur.

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Effect of shim configuration on flow dynamics and operability windows in stripe slot coating process

Journal of Coatings Technology and Research ◽

10.1007/s11998-013-9485-3 ◽

2013 ◽

Vol 11 (1) ◽

pp. 19-29 ◽

Cited By ~ 18

Author(s):

Gui Hua Han ◽

Si Hyung Lee ◽

Won-Gi Ahn ◽

Jaewook Nam ◽

Hyun Wook Jung

Keyword(s):

Flow Dynamics ◽

Coating Process ◽

Slot Coating

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Coating window for double layer extrusion slot coating of poly (vinyl-alcohol) solutions

Polymer Engineering & Science ◽

10.1002/pen.10879 ◽

2001 ◽

Vol 41 (10) ◽

pp. 1823-1829 ◽

Cited By ~ 12

Author(s):

Shih-Yuan Lu ◽

Yu-Ping Lin ◽

Ta-Jo Liu

Keyword(s):

Double Layer ◽

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

Slot Coating ◽

Coating Window

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An Optimal Die Design for the Coating Uniformity of Non-Newtonian Liquids in Slot Coating Process

Korean Chemical Engineering Research ◽

10.9713/kcer.2011.49.3.314 ◽

2011 ◽

Vol 49 (3) ◽

pp. 314-319 ◽

Cited By ~ 6

Author(s):

Si-Hyung Lee ◽

Hyun-Jung Koh ◽

Seo-Hoon Shim ◽

Hyun-Wook Jung ◽

Jae-Chun Hyun

Keyword(s):

Die Design ◽

Coating Process ◽

Slot Coating ◽

Coating Uniformity ◽

Newtonian Liquids

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Economics of coated paper production made from deinked pulp

TAPPI Journal ◽

10.32964/tj12.4.19 ◽

2013 ◽

Vol 12 (4) ◽

pp. 19-27

Author(s):

PATRICK HUBER ◽

LAURENT LYANNAZ ◽

BRUNO CARRÉ

Keyword(s):

Mechanical Properties ◽

Optimization Methods ◽

Coating Process ◽

Coated Paper ◽

Paper Production ◽

Base Paper

The fraction of deinked pulp for coated paper production is continually increasing, with some mills using 100% deinked pulp for the base paper. The brightness of the coated paper made from deinked pulp may be reached through a combination of more or less extensive deinking, compensated by appropriate coating, to optimize costs overall. The authors proposed general optimization methods combined with Kubelka-Munk multilayer calculations to find the most economical combination of deinking and coating process that would produce a coated paper made from DIP, at a given target brightness, while maintaining mechanical properties.

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Depletion of coating color components in the blade coating process circulation

TAPPI Journal ◽

10.32964/tj10.9.17 ◽

2011 ◽

Vol 10 (9) ◽

pp. 17-23 ◽

Cited By ~ 1

Author(s):

ANNE RUTANEN ◽

MARTTI TOIVAKKA

Keyword(s):

Fine Particles ◽

Particle Density ◽

Stable Process ◽

Size Fraction ◽

Color Stability ◽

Strong Interactions ◽

Coating Process ◽

Size Segregation ◽

Coating Color ◽

Average Size

Coating color stability, as defined by changes in its solid particle fraction, is important for runnability, quality, and costs of a paper coating operation. This study sought to determine whether the size or density of particles is important in size segregation in a pigment coating process. We used a laboratory coater to study changes in coating color composition during coating operations. The results suggest that size segregation occurs for high and low density particles. Regardless of the particle density, the fine particle size fraction (<0.2 μm) was the most prone for depletion, causing an increase in the average size of the particles. Strong interactions between the fine particles and other components also were associated with a low depletion tendency of fine particles. A stable process and improved efficiency of fine particles and binders can be achieved by controlling the depletion of fine particles.

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