John R. Myers has been an engineer in plastics extrusion for 50 years and an independent consultant to the blown film industry since 1974. Myers has been instrumental in establishing seven blown film operations, but works mostly with existing plants in training, design, or improvements to processes and technology. Email him at JohnRMyersCo@AOL.com
Unless you have extruded some heavy gage tubing or very large rolls of blown film tubing (or ‘J’ sheet) possibly using an edge guide, you may not have experienced “flanges” on the edge of a roll of film.
