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Plastic melt is extruded through an annular slit die, vertically to form thin walled tube. • Air is introduced in the centre of the die to blow up the tube Blown Film Dies. December 2012. In book: Design of Extrusion Forming Tools (pp.141-168); Edition: Insufficient Mixing. Increase back pressure by increasing screen mesh. Extrusion temperature too high. Decrease die and adaptor temperatures. Many problems occur in blown film extrusion in the hot melt between the die and the frost line and where the tube is collapsed at the main nip. Other sections. Air Ring. Extruder. Side. “Sow Belly”. Hot side becomes thinner before freezing. Page 11. Single Peak TD Gauge Variation. Linear Plot. Collapsing Frame. To minimize the residence time of. K-Resin SBC in the extruder, extruders having. L/D ratios higher than 30:1 should be avoided for blown film extrusion. ForBlown film extrusion is one of the most significant polymer processing methods. Several billion pounds of polymer, mostly polyethylene, are processed Kirk Cantor Blown Film Extrusion An Introduction Hanser Publishers, Munich • Hanser Gardner Publications, Cincinnati The Author: Prof.