Anti-blocking additive for films

Anti-blocking additive for films

Thursday, 13 May, 2021

Manufacturing of films can result in blocking problems. This is a defect where adhesion of two adjacent layers occurs. It generally occurs when polyethylene (PE) and polypropylene (PP) are used, and to a lesser extent in extrusion coatings or laminated products. This phenomenon occurs between adjacent layers of film due to the presence of Van der Waals forces between the amorphous regions of the polymer.

To combat this problem, an anti-blocking additive should be used, such as the LINGWE silicas. They function by generating miniscule protrusions on the surface of the film. The roughness generated helps to minimise the contact surface area between films and therefore increases the distance between the two layers, minimising blocking.

The range of anti-blocking additives distributed by Comindex comprises synthetic amorphous silicas with a porous structure and a large specific surface area. They feature the following characteristics:

Easy dispersion
Compatible with a wide range of plastics
Do not affect the transparency or mechanical properties of the film
Do not contain toxic or volatile substances
Comply with food contact regulations

Depending on the chosen product line – K or CTT – the silicas will be compatible with one type of polymer or the other – PP and PE or PET and PBT respectively. Furthermore, they feature different particle sizes to suit the required film thickness.

For further information about these products, please contact our technical advisory team.

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