Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Effects of Processing Conditions on Thickness Distribution for a Laminated Film during Vacuum-Assisted Thermoforming

열진공성형 공형조건이 적층필름의 두께분포에 미치는 영향

  • 유영길 (충주대학교 대학원) ;
  • 이호상 (충주대학교 항공기계설계학과)
  • Received : 2011.03.21
  • Accepted : 2011.05.03
  • Published : 2011.06.01
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Abstract

Vacuum-assisted thermoforming is one of the critical steps for the successful application of film insert molding(FIM) to parts of complex shapes. If the thickness distribution of the formed film is non-uniform, cracking, deformation, warping, and wrinkling can easily occur at the injection molding stage. In this study, the effects of processing parameters, which include the film heating time, plug depth, plug speed and vacuum delay time, on film thickness distribution were investigated. It was found that the film thickness at the part sidewall decreases with increasing the film heating time and plug depth, but the thickness at the bottom was found to exhibit the opposite behavior. The film thickness of the sidewall was observed to increase at higher plug speed and vacuum delay time of 0 ~ 0.3sec.

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Acknowledgement

Supported by : 한국연구재단

References

  1. E. Gimenez, J. M. Lagaron, L. Cabedo, R. Gavara, J. J. Saura, 2004, Study of the thermoformability of ethylene-vinyl alcohol copolymer based barrier blends of interest in food packaging applications, J. of Appl. Poly. Sci., Vol. 96, pp. 3851-3855.
  2. E. Gimenez, J. M. Lagaron, M. L. Maspoch, L. Cabedo, J. J. Saura, 2004, Uniaxial tensile behavior and thermoforming characteristics of high barrier EVOH-based blends of interest in food packaging, Poly. Eng. & Sci., Vol. 44, pp. 598-608. https://doi.org/10.1002/pen.20054
  3. J. K. Lee, T. L. Virkler, C. E. Scott, 2001, Effects of rheological properties and processing parameters on ABS thermoforming, Poly. Eng. & Sci., Vol. 41, pp. 240-261. https://doi.org/10.1002/pen.10725
  4. J. K. Lee, T. L. Virkler, C. E. Scott, 2001, Influence of initial sheet temperature on ABS thermoforming, Poly. Eng. & Sci., Vol. 41, pp. 1830-1844. https://doi.org/10.1002/pen.10880
  5. S. Poller, W. Michaeli, 1992, Film temperatures determine the wall thickness of thermoformed parts, SPE ANTEC, Vol. 38, pp. 104-108.
  6. A. Aroujallan, M. O. Ngadi, J. P. Emond, 1997, Wall thickness distribution in plug-assist vacuum formed strawberry containers, Poly. Eng. & Sci., Vo. 37, pp. 178-182. https://doi.org/10.1002/pen.11659
  7. S.-C. Chen, S.-T. Huang, M.-C. Lin, R.-D. Chien, 2008, Study on the thermoforming of PC films used for in-mold decoration, Int. Comm. in Heat and Mass transfer, Vol. 35, pp. 967-973. https://doi.org/10.1016/j.icheatmasstransfer.2008.04.008
  8. G. Kim, K. Lee, S. Kang, 2009, Prediction of the film thickness distribution and pattern change during film insert thermoforming, Poly. Eng. & Sci., Vol. 49, pp. 2195-2203. https://doi.org/10.1002/pen.21467

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