Advances in Calcium Carbonate (CaCO3) Masterbatch Loading in ABA Film Blowing: Polymer Rheology and Structural Strength Retention

1. Economic Imperative of Inorganic Fillers

Calcium carbonate (CaCO3) masterbatch is widely used as a cost-reducing filler in polyolefin film extrusion. However, high filler loading in monolayer film causes chalking, reduced dart impact strength, and poor heat sealability.

2. ABA Co-Extrusion Shielding Effect

By encapsulating a heavily filled B layer (containing up to 50% nano-calcium carbonate) between thin virgin PE A skin layers, the ABA structure locks the filler in the middle. The smooth outer A layers retain high gloss, excelente printability, and robust heat-sealing integrity.