A five-layer cast and blown film line for lab or small-scale production was recently built by Macro Engineering & Technology Inc., Mississauga, Ont. It can be converted from blown to cast film in less than 2 hr. Switching involves removing the 4-in.-diam. blown film die and attaching the 22-in.-wide cast fi lm die. With the latter in place, the extruder platform is raised and a pre-aligned casting unit is moved along tracks into active position. The line is equipped with all the features of a full-scale blown and cast fi m line, including a D10 dual-lip air ring, IBC, die-based automatic gauge control, and a dual-sided corona treater. The auto-gaugecontrol system uses the same Thermo Fischer thickness gauge (with special software) to control blown or cast film. The same extruder and winder are used in both modes. Meanwhile, Rajoo Engineers Ltd. in Rajkot, India, recently supplied its first convertible 5-layer coex line for the application center of Indian resin producer Reliance Industries Ltd. The line converts from barrier sheet to blown film. It has four extruders, screen changers, melt pumps, and a flat die for sheet up to 650 mm wide and 0.2 to 0.8 mm thick; as well as a 5-layer coex die for blown film from 25 to 100 microns. Output is up to 165 lb/hr. Sheet and film dies shuttle back and forth on rails into position between the extruders and winder, which are the same in both modes. (905) 507-9000 • www.macroeng.com +91 (2827) 25 27 01 • www.rajoo.com
Macro Engineering & Technology
199 Traders Blvd. East Mississauga, L4Z 2E5, Ontario, Canada
Phone (905) 507-9000 Fax (905) 507-3000
Editor PickSizing the Barrier Gap
Here’s a less complex way to properly size the barrier gap for barrier screws.