Sealing Since heat sealing is the main method used to prepare a wide variety of flexible and semi-rigid packagings, the heat sealability of extrusion-coated packaging products is one of the most important properties for their use. In packaging applications, seals must provide adequate mechanical strength and leak tightness. Hermetic integrity means gas tight sealing, but
Authors & references
Dr. Johanna Lahti, Tampere University
Based on: Lahti, J., Hatanpää, I. and Lahtinen, K. Converting of fibre based packaging materials (Chapter 8). In: Kuusipalo, J. (ed), Paper and Paperboard Converting, (Book 12), Papermaking Science and Technology. 2nd edition. Jyväskylä, 2008, Finnish Paper Engineers’ Association/Paperi ja Puu Oy. pp. 186 – 208. More literature references can also be found in this chapter.
Savolainen, A., Kuusipalo, J., Laiho, E., Penttinen, T. 1998. Extrusion coating and product applications. In: Savolainen, A. (ed.) Paper and Paperboard converting, Helsinki, Fapet Oy. pp. 123-187. ISBN 952-5216-00-4 ISBN 952-5216-12-8.
Halle, R.W., 1989. Polymer and processing parameters influencing the heat sealability of polyethylenes. Polymers, Laminations and Coatings conference, Orlando, FL, 5–8 September, TAPPI Proceedings, pp. 799-802.
Gregory, B. H., 2005. Extrusion coating a process manual. Victoria, BC, Canada. Trafford Publishing. 217 p.
Mueller C. et al., 1998. Heat sealing of LLDPE: Relationship to Melting and Interdiffusion. Journal of Applied Polymer Science. Vol. 70, no. 10, pp. 2021- 2030.
Stehling, F. C., Meka, P., 1994. Heat Sealing of Semicrystalline Polymer Films. II. Effect of Melting Distribution on Heat-Sealing Behavior of Polyolefins. Journal of Applied Polymer Science, Vol. 51, no. 1, pp. 105–119.
Theller, H. W., 1988. Heatsealability of flexible web materials in hot-bar sealing applications. Polymers, Laminations and Coatings conference, Atlanta, GA, 13-16 September, TAPPI Proceedings, pp. 497–506.
Brody, A. L., Marsh, K. S., 1997. The Wiley Encyclopedia of Packaging Technology, Second Edition, Canada, John Wiley & Sons, Inc., 1023 p.
Herrmann T., Lynch, B., 2003. Ultrasonic sealing of flexible pouches through contaminated sealing surfaces. ANTEC 2003, Nashville. pp. 2629–2635.
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