How Aluminium Foil Improves the Hot Tack of Packaging Laminates, 2006 PLACE Conference

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In descriptions of sealing performance of flexible packaging, specialists mostly emphasize the magic property of “hot tack”. They merely concentrate on the melt adhesive strength of the sealant thermoplastic material used and disregard other prerequisites for good sealing. This article explains why hot tack is a system property and describes the sealing performance of a number of packaging laminates, some containing aluminium foil.

With its outstanding thermal conductivity, which is far higher than that of any other flexible packaging component, aluminium foil favours the rapid cooling of seal seams and helps to speed up the packaging process. In addition, the dead fold characteristic of aluminium foil allows seal seams to retain their given shape and makes seams more reliable.