Do heat seal labels work well on flexible packaging such as pouches and sachets?

Yes, heat seal labels work well on flexible packaging such as pouches and sachets, since the heat-activated adhesive is designed to bond reliably to flexible film surfaces without the cold-tack issues that can affect standard pressure-sensitive labels on soft, moving substrates.

Pouches and sachets present a different labelling challenge from rigid bottles or jars, since the packaging surface can flex, move slightly during handling, and often has a lower surface energy than glass or metal. Heat seal adhesive is formulated to bond effectively to these film substrates once activated, and because the adhesive is inactive until heat is applied, there is less risk of the label sticking prematurely or misaligning as flexible packaging moves through automated equipment at speed.

A further advantage on flexible packaging is that heat seal labels can be used for closure functions, such as sealing a flap or resealable strip on a sachet, in addition to carrying branding and product information. Activation temperature needs to be matched to the specific film used for the pouch or sachet, since some flexible packaging films are more heat-sensitive than rigid containers and could distort if the labelling equipment runs hotter than the film can tolerate, which is why the film and label combination should be validated together before full production.