Static Mixer Is a First for PVC

A radically streamlined version of Sulzer Chemtech’s traditional static mixer has been introduced for PVC.

A radically streamlined version of Sulzer Chemtech’s traditional static mixer has been introduced for PVC. Swiss-based Sulzer, with U.S. offices in Tulsa, Okla., believes this is the first static mixer ever developed for PVC. Called Polyguard, it improves thermal mixing and melt homogenizing, minimizes flow lines, and improves color distribution, though it doesn’t mix as aggressively as a traditional mixer. Polyguard can also mix elastomers. It has shorter bars than a standard mixer, rounded on one side to make them self-cleaning with no place for resin to hang up. Pressure drop before the die is less than 5%, Sulzer says. Its first Polyguard static mixer was built for a 40-mm extruder and has been tested on pipe and sheet in Germany.