Macro Engineering: Hot lip controls blown-film gauge

A new automatic gauge-control system for blown film positions cartridge heaters at 2-in. intervals in the outer die lip. The interval can vary depending on application. Macro Engineering & Technology Inc., Canada, teams its Accupro die with auto-tuning software and a 360-degree oscillating gamma-backscatter gauge from NDC Infrared Engineering. Macro unveiled the new system at an open house in late June, where it ran 2-mil film with gauge variation (2-sigma) of +/-1.9%. The Accupro lips can be retrofitted onto most blown-film dies and will improve thickness uniformity by at least 50%, Macro says.

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