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passing through the cooling bath, the tube goes to a haul-off, a unit based on rubber caterpillar bands or a system of moving clamps, and then to winding equipment or to a cutting device. Pressure Screen Gear Transducer Changer Pump Die Figure 4. Pipe Extrusion Blown Film Film can be extruded either as a thin-walled tube, cooled by air, or as flat sheet cast onto chilled rolls or into water. In the blown film process (Figure 5.) the melt is extruded through an annular die to produce a tube of controlled diame- ter and wall thickness. Vertical extrusion, where the die is mounted in a right- angle cross-head, is generally used. The extruded melt is partially cooled in the vicinity of the die, often by passing the tube through a carefully controlled stream of air from a cooling ring. The tube of film is then inflated to a bubble of the required diameter, by low-pressure air introduced through the mandrel in the annular die. The film is hauled off between a pair of nip rolls, located 1 to 10+ meters (3 to 30+ feet) from the die. Thus, the inflation air is trapped within the bubble formed between the nip rolls and the die. After passage through the nip rolls, the cold film is reeled up under constant tension. Nip (or Pinch) Rolls Stainless Steel Nip Roll (Driven) Treater Bar Idler or Guide Rolls Dancer Roll for Tension Control Rubber Nip Rolls Forming Tent Guide Rolls Framework Supporte d Polyethylene Film Curtain (Canopy) B u b bl e Resin (Alternative) Frost Line Frost Lin Extruder Cylinder Blow Tube (Bubble) Mandrel Die Ring Air Entry Windup Rolls Breaker Plate Heaters Figure 5. Blown Film Extrusion Sizing Tank Cooling Unit Haul-Off Unit Cutting Unit 7 section 1: introduction to extrusionPDF Image | Dynisco Extrusion Processors Handbook
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