An Investigation of Seal Strength Effect on Heat Sealing Factor and Optimization Parameter of Heat Sealing of PET Film to PP Cup on the yogurt product


  • Nadnalin Janlaset นักศึกษา หลักสูตรปรัชญาดุษฎีบัณฑิต สาขาวิชาวิศวกรรมเครื่องกล คณะวิศวกรรมศาสตร์ มหาวิทยาลัยขอนแก่น
  • Keatfa Tungjaijit รองศาสตรจารย์ สาขาวิชาวิศวกรรมเครื่องกล คณะวิศวกรรมศาสตร์ มหาวิทยาลัยขอนแก่น


Heat sealing, Seal strength, Sealing of laminate Film, Plastic cup heat sealing, Process window


The effect of parameters affecting the heat-sealing process of PET laminate film and PP plastic cups within 150g of yogurt product was studied with temperature, time, and pressure in the sealing process. It was found that at temperatures uprising from 140°C, the strength of the seal joint was increased by more than 10 N/mm. It was an acceptable heat-sealing strength value in this experiment, and the dwell time due to the limitation of sealer required to be more than 0.1 s. The pressure effect was found to have little on the change in seal marks. It was consistent with the past research. So, the experimental results were used to create a process window graph to determine the heat sealer's parameters to determine the appropriate values, reduce energy consumption, and increase production speed.


Suteerapot W. The report on export result of canned fruits and processed fruits in 2017. Department of International Trade Promotion, Ministry of Commerce. 2017.

Ponnambalam D, Loong Tak Lim, Manickavasagan A. Effect of heat-sealing parameter on the thermal profile and seal strength of multilayer films and non-woven. Packaging Technology and science., 2021;34(10), 623-639.

Euapitaksakul N. Heat sealing of polypropylene film in flexible packaging. [Thesis of Master of Science, Department of Materials Science] Bangkok: Chulalongkorn University; 2539.

Morris BA. The science and Technology of flexible Packaging; Multilayer Film from Resin and Process to End Use. Elsevier;2017.

Meka P, Stehing FC. Heat sealing of Semicrystalline Polymer Films. Calculation and Measurement of Interfacial Temperature: Effect of Process Variables on Seal Properties.” Journal of Applied Polymer Science 1994; 51 (1): 89-103.

NAJARZADEH Z. Control and optimization of sealing layer in films. Doctoral thesis in Chemical engineering, University of DE MONTREAL. 2014.

Theller HW. Heat seal ability of Flexible Web Materials in Hot-Bar Sealing Application. Journal of plastic film sheeting 5, 1989; 66-93.

Selke SEM, Culter JD, Hernandez RJ. Plastics packaging Properties, Processing, Applications, And Regulations, 2nd ed. Hanser Gardner Publications. 2004.

Tetsuya T, Ishiaku US, Mizoguchi MH. The effect of heat-sealing temperature on the properties of OPP/CPP heat seal. I. Mechanical properties. Journal of Apply polymer science. 2005;97, 753-760.

Stoke VK. Joining methods for plastics and plastic composite: an overview. Polymer engineering science. 1989; 29, 1310-1324.

Hassan A. seal strength. Express Effect of bar sealing parameter on OPP/MCPP heat polymer. 1, 2007;733-799.

Suramya DM, Loong-Tak Lim. Heat sealing of LLDPE films: Heat transfer modeling with liquid presence at the film-film interface. Journal of Food Engineering. 2013;116, 532-540.