Articles & Issues

Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received September 23, 2000
Accepted February 26, 2001

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

All issues

Analysis of the Bowing Phenomenon in the Tenter Process of Biaxially Oriented Polypropylene Film

O Ok Park^† Soo Wan Kim Cheon Il Park Seung-Man Yang

Center for Advanced Functional Polymers, Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusungdong, Yusonggu, Daejeon 305-701, Korea

oopark@kaist.ac.kr

Korean Journal of Chemical Engineering, May 2001, 18(3), 317-321(5), 10.1007/BF02699171

Download PDF

Abstract

In order to understand the bowing phenomenon in the tentering process of biaxially oriented polypropylene film, a simple mathematical model has been developed by considering the overall continuity equation and relevant momentum equations. The model has been solved analytically by employing a lubrication approximation for an isothermal, Newtonian fluid with variant densities depending upon the external deformation. Both velocity and stress profiles in the tenter process and also birefringence and extinction angle profiles can be calculated accordingly. Geometrical bowing is strongly dependent upon the degree of volume change during extensional deformation. Theoretical prediction is compared with experimental birefringence data with two types of PP resins and two different operation conditions to give us excellent agreement. It can be said that this model is applicable to other biaxially oriented film processes such as PET.

Keywords

Polypropylene Film Tenter Process Bowing Phenomenon Birefringence

References

Kase S, Kawano N, J. Rheol., 28(3), 229 (1984)
Kase S, Inoue K, J. Rheol., 30(1), 55 (1986)
Kim SW, MS thesis, KAIST (1999)
Korea Patent 96-37257
Korea Patent 96-3932
Korea Patent 97-10077
Park OO, Kwon MH, Korean J. Chem. Eng., 6(2), 150 (1989)
Kwon MH, Lee YS, Park OO, Korean J. Chem. Eng., 16(2), 265 (1999)
Park OO, Hwang CI, Lim TJ, Korean J. Chem. Eng., 6(1), 23 (1989)
Yamada T, Nonomura C, J. Appl. Polym. Sci., 52(10), 1393 (1994)