Latest Developments in On-Line Measurement and Control of Multilayer Blown Films: Full Spectrum InfraRed (FSIR) and Air Ring

摘要

This paper expands on a previous work that focuses on a new technique of precisely mapping the double-layer lay-flat measurement to the rotating top nip of bubble to provide discrimination of various polymer layers using the Full Spectrum Infra Red sensor technology to the automated air ring. Previous papers discussed the resulting rapid Auto Profile Control (APC) of the annular die to ensure blown film gauge uniformity. Film quality improvements along with significant savings due to down gauging and reduced scrap while improving productivity have been achieved in both the viscosity heaters and with the air ring.