Stresses and Defects in Roll Products: A Review of Stress Models and Control Techniques

Lee, Chang-Woo

doi:10.1007/s12541-018-0094-z

Cited by 15 publications

(3 citation statements)

References 52 publications

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“…During the winding process, as the radius ratio of the wound roll increases, the amount of wound material increases, so the radial stress in the inner layer increases. Excessive radial stress in the wound roll may cause defects, such as local deformation, starring defects, and telescoping, which may degrade the quality of wound roll products [ 21 ]. Accordingly, a method for optimizing a taper tension profile to manufacture a high-quality wound roll has been actively studied, and a linear taper tension profile (σ w-L ), a hyperbolic taper tension profile (σ w-H ), and a parabolic taper tension profile (σ w-P ) have been proposed [ 20 ].…”

Section: Winding Tension and Radial Stressmentioning

confidence: 99%

“…If the radial stress in the wound roll is excessively high, then the wound coated layer may be deformed or cracked. Therefore, it is essential to analyze the effects of internal stresses on the quality of the functional layer and determine the radial stress range to prevent defects in the wound roll [ 21 ]. In this study, we analyzed the impact of radial stress, which increases over time due to residual stress, on the quality of the coated layer inside a wound roll manufactured through a roll-to-roll slot-die coating system.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Radial Stress on the Nanoparticle-Based Electrolyte Layer in a Center-Wound Roll with Roll-to-Roll Systems

Noh

Cho

et al. 2022

Nanomaterials

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Recently, slot-die coating based on the roll-to-roll process has been actively used to fabricate nanoparticle-based electrolyte layers because it is advantageous for high-speed processes and mass production of uniformly thick electrolyte layers. In this process, the fabricated electrolyte layer is stored as a wound roll throughout the rewinding process. We analyzed the defects and geometric changes in an electrolyte layer, i.e., gadolinium-doped cerium oxide (GDC), due to the radial stress in the wound roll. We found that the thickness of the coated layer could be decreased by increasing the radial stress, i.e., cracks can be generated in the coated layer if excessively high radial stress is applied to the wound-coated layer. More thickness changes and crack defects were generated with time due to the residual stress in the wound roll. Finally, we analyzed the effects of taper tension profiles on the defects of the coated layer in the wound roll and determined the taper tension profile to minimize defects.

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Section: Winding Tension and Radial Stressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Radial Stress on the Nanoparticle-Based Electrolyte Layer in a Center-Wound Roll with Roll-to-Roll Systems

Noh

Cho

et al. 2022

Nanomaterials

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“…Its most significant advantage is that it can improve flow phenomena and production problems by quantitatively analyzing flow field characteristics. Compared to the analytical methods of one-dimensional lubrication approximation theory, [6][7][8][9][10] numerical methods avoid errors caused by too many assumptions. Hence, the dies designed by numerical methods are more effective.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on flow characteristics of dual‐cavity die based on multi‐objective optimization

Han,

Gong,

et al. 2024

Polymer Engineering & Sci

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Slot die coating is a common method of manufacturing electrodes for lithium‐ion batteries. In this paper, a multi‐objective optimization research on the geometry of dual‐cavity die is investigated based on the numerical simulation of lithium battery anode slurry flow combined with the surface response optimization method. First, we use the Plackett–Burman test method to screen the geometric parameters significantly affecting the optimization objective. Then, based on the Box–Behnken response surface analysis method, we determine the optimal combination of parameters. The results show that the inner cavity radius and slot gap are the main structural variables affecting exit‐velocity uniformity and die deformation. The slot gap and slot length mainly affect the inlet pressure. The coefficient of deviation of exit velocity uniformity and average inlet pressure of the optimized die structure decreased by 51.3% and 7.6%, respectively. This research provides theoretical guidance for the design of slot coating dies.Highlights Screening significant geometric parameters using Plackett–Burman test methodology. Box–Behnken response surface analysis to determine optimal parameters. Velocity uniformity and inlet pressure increased by 51.3% and 7.6%, respectively.

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Computational fluid dynamics model for thickness and uniformity prediction of coating layer in slot-die process

Kim

Lee

2019

Int J Adv Manuf Technol

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Stresses and Defects in Roll Products: A Review of Stress Models and Control Techniques

Cited by 15 publications

References 52 publications

Effect of Radial Stress on the Nanoparticle-Based Electrolyte Layer in a Center-Wound Roll with Roll-to-Roll Systems

Effect of Radial Stress on the Nanoparticle-Based Electrolyte Layer in a Center-Wound Roll with Roll-to-Roll Systems

Experimental and numerical study on flow characteristics of dual‐cavity die based on multi‐objective optimization

Computational fluid dynamics model for thickness and uniformity prediction of coating layer in slot-die process

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