Prediction of Bowing Phenomenon for Polyimide Film Accompanying Reactions and Removal of Solvents During Film Heating with Tenter

Itoh, Toshihisa; Yamada, Toshiro; Sugihara, Genki; Mori, Keigo

doi:10.4325/seikeikakou.18.883

Cited by 2 publications

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References 2 publications

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“…They obtained good agreement between the simulated and the experimental results. Itoh et al [32] have predicted the bowing phenomenon and the state of stress during reaction and removal of the solvents process in the tenter for polyimide (PI) film using FEM under the assumption that PI film is a linear‐elastic body. They have reported that the experimental orientation angle of the film was comparatively close to the direction of the maximum principal stress calculated by FEM.…”

Section: Introductionmentioning

confidence: 99%

The deformation behavior of polypropylene film under high strain rates

Tokihisa

Kushizaki

Tomiyama

et al. 2012

Polymer Engineering & Sci

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The relationship between stress and strain for polypropylene film was studied under strain rates from 0.13 to 5.21 s 21 in order to study the deformation behavior of film under higher strain rates than previous studies. Uniform thickness was obtained in the strain rates from 2.08 to 5.21 s 21 at 435 K, or from 2.08 to 3.13 s 21 at 437 K. The temperature rise of film due to the generation of heat from plastic strain influenced the relationship between stress and strain, in particular, at high strain rates and low temperature. Material constants for the constitutive equation of film were determined using the measurements from 2.08 to 5.21 s 21 at 435 K and from 2.08 to 3.13 s 21 at 437 K. Film thicknesses during and after transverse direction stretching were successfully predicted by applying the material constants obtained. The authors concluded that the material constants should be determined by applying the stretching conditions, under which there is little or no effect from heat generation and under which film can be stretched uniformly in thickness. POLYM. ENG. SCI., 53:309-320, 2013. ª

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Section: Introductionmentioning

confidence: 99%

The deformation behavior of polypropylene film under high strain rates

Tokihisa

Kushizaki

Tomiyama

et al. 2012

Polymer Engineering & Sci

Self Cite

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The Prediction of Bowing Distortion of Film after Transverse Stretching with Consideration of Heated Air Flow in a Tenter

Tokihisa

Kushizaki

Tomiyama

et al. 2011

International Polymer Processing

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The bowing distortion of polypropylene (PP) film during transverse direction (TD) stretching with a tenter was newly predicted with consideration for heated air flow. The distribution of the heat transfer coefficient on film was calculated by the results of air flow analysis in the tenter in order to obtain a more realistic heat transfer condition than in previous works based on an impinging jet model and a wall jet model. Bowing distortion after stretching was calculated by applying the distribution of heat transfer coefficient obtained from air flow analysis under the assumption that the deformation of film obeys an elastic-plastic rule. Another bowing distortion was also calculated by applying an impinging jet model and a wall jet model in order to evaluate the applicability of the distribution of heat transfer coefficient obtained from air flow analysis. The authors experimentally measured the bowing distortion and the film thickness after stretching using a pilot plant. It has been shown that the calculated results based on the distribution of heat transfer coefficient obtained from air flow analysis are closer to the experimental results than previous works based on an impinging jet model and a wall jet model, particularly at faster line speed. It is revealed that the distribution of heat transfer coefficient has a strong influence on the temperature of film, and the difference of the predicted temperature causes a difference in the thickness change in film and longitudinal stress. The authors concluded that the difference in thickness change in film and longitudinal stress brought about the difference in bowing distortion.

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Prediction of Bowing Phenomenon for Polyimide Film Accompanying Reactions and Removal of Solvents During Film Heating with Tenter

Cited by 2 publications

References 2 publications

The deformation behavior of polypropylene film under high strain rates

The deformation behavior of polypropylene film under high strain rates

The Prediction of Bowing Distortion of Film after Transverse Stretching with Consideration of Heated Air Flow in a Tenter

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