Tubi/profili in PVC

High shear + heat = additives with poor compatibility race to the surface and stick. Fix it by:

· Switching to a highly compatible polyester wax inside the melt.

· Tightening the internal/external lube ratio and total dosage.

You’ll get longer runs, fewer die wipes, better gloss, and more stable output.

Yes. Think of adding tiny “shock absorbers” inside the PVC:

· Polyester homopolymers form fine dispersions that lift elongation while keeping strength/modulus.

· Replace part of your typical toughener within the recommended window, and don’t over-lubricate.

· Net effect: better performance and a cost edge

· Polyester wax = smoother, more uniform melt, less local viscosity spike.

· Low-density oxidized PE wax = better overall flow, less plate-out, higher gloss.

· Add polyester homopolymer to keep strength/dimensions solid at speed.