THERMAL SEAL FORCE OF COATED BIDIRECTIONAL STRETCHED PET FILM USED IN FOOD PACKAGING INDUSTRY

Year 2021, Volume: 4 Issue: 2, 147 - 156, 31.12.2021

Emrah Özahi , Çağrı Tıkıloğlu

Abstract

In addition to the mechanical and permeability properties of food packaging, heat sealing ability of packaging is critical in order to protect a product and extend its shelf life. Optimum temperature sealing is an essential necessity in the packaging industry. Important control parameters for bonding are jaw temperature, jaw pressing time and jaw clamping force. Sufficient pressure must be applied to the surfaces to achieve acceptable adhesion. The physical evaluation of an adhesion can provide a useful qualitative indicator of the effectiveness of the heat sealing process and is based on optimization of the parameters of dwell time, temperature and process pressure. The purpose of this work is to define the effective jaw heat and compression time for the seal strength of the surface coated PET film to the APET surface. The analysis of the thermal adhesion performance of the copolyster surface coated biaxially oriented PET (BOPET) film is brought to the literature. It will guide the determination of the process conditions of the packaging machine to be used after the film production in the sector. Thus, it will contribute to production and energy efficiency as there will be analyzed data about the required jaw temperature, jaw pressing time and pressing force in packaging machines. The effects of parameters on the seal strength were analyzed using the Box-Behnken design, which is a response surfaces methodology (RSM). Then, the significance of the variables was examined by regression analysis. In the study, the correlation coefficient value was 0.995 and it is seen that the model represents 99.5% of the experiments. The most effective factor determined at the 0.05 statistics significance level was jaw temperature.

Keywords

BOPET, Box-Behnken Experiment Design, Response Surface Method, Heat Seal, Coating

References

• [1] Aithani, D., Lockhart, H., Auras, R., & Tanprasert, K. (2006). Heat sealing measurement by an innovative technique. Packaging Technology and Science: An International Journal, 19(5), 245-257.
• [2] Leminen, V., Mäkelä, P., Tanninen, P., & Varis, J. (2015). Leakproof heat sealing of paperboard trays-Effect of sealing pressure and crease geometry. BioResources, 10(4), 6906-6916.
• [3] Morris, B. A. (2016). The science and technology of flexible packaging: multilayer films from resin and process to end use. William Andrew.
• [4]Mihindukulasuriya, S., & Lim, L. T. (2012). Effects of Liquid Contaminants on Heat Seal Strength of low‐density polyethylene Film. Packaging Technology and Science, 25(5), 271-284.
• [5] Nisticò, R. (2020). Polyethylene terephthalate (PET) in the packaging industry. Polymer Testing, 106707.
• [6] Peiffer, H., Janssens, B., Hilkert, G., & Broemmel, P. (2008). U.S. Patent No. 7,329,453. Washington, DC: U.S. Patent and Trademark Office.
• [7] Mueller, C., Capaccio, G., Hiltner, A., and Baer, E. (1998). Heat sealing of LLDPE: Relationships to melting and interdiffusion. Journal of Applied Polymer Science, 70(10).
• [8] Hishinuma, K. (2009). Heat sealing technology and engineering for packaging (1st ed.). Lancaster, Pennsylvania 17602 U.S.A.: DEStech Publications, Inc.
• [9] Aiyengar, R., & Divecha, J. (2012). Experimental and statistical analysis of the effects of the processing parameters on the seal strength of heat sealed, biaxially oriented polypropylene film for flexible food packaging applications. Journal of Plastic Film & Sheeting, 28(3), 244-256.
• [10]ASTM. American Society for Testing and Materials Standard Test. 2009. Method for Seal Strength of Flexible Barrier Materials. F88/F88M-09. West Conshohocken, PA.
• [11] Myers, R. H., Montgomery, D. C., & Anderson-Cook, C. M. (2016). Response surface methodology: process and product optimization using designed experiments. John Wiley & Sons
• [12] Box, G. E., & Draper, N. R. (1987). Empirical model-building and response surfaces (Vol. 424). New York: Wiley.
• [13] Değirmencioğlu, A., & Yazgı, A. (2006). Tepki Yüzeyleri Metodolojisi" Optimizasyon Esaslı Çalışmalara İlişkin Teorik Esaslar ve Tarımsal Mekanizasyon Uygulamaları". Tarım Makinaları Bilimi Dergisi, 2(2), 111-115.
• [14] Tekindal, M. A. (2009). Yanıt Yüzeyi Metodu ve Bir Uygılama, Yüksek Lisans Tezi, Gazi Üniversitesi, Fen Bilimleri Enstitüsü, İstatistik Anabilim Dalı.