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ACR (acrylic ester): improves melt elasticity, reduces extrusion swelling, and ensures sheet size stability, but excessive use can increase viscosity.

Oxidized polyethylene wax: reduces melt viscosity (external lubrication effect), improves surface smoothness, but requires controlled addition amount (usually 0.2%~0.8%) to prevent migration.

How to solve the compatibility problem between additives and calcium carbonate (CaCO3, filler)?

Select surface treated active calcium carbonate (such as stearic acid coating) to reduce competitive adsorption with lubricants.

Adding coupling agents (such as titanium esters) improves the bonding strength between inorganic fillers and PVC interfaces, preventing the migration of additives to the surface of the fillers.