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1 de abr. de 1999 · Air rings do more than just blow cooling air on your film. Their complex aerodynamic effects also help form and stabilize the bubble. Yet operators often misuse air rings because they don't understand how the stabilizing function works.
10 de ago. de 2020 · The air ring entry distributes the chilled air coming through the duct around the perimeter. Many air rings do this by splitting the air supply with a manifold into four to eight equal-length ducts to supply multiple inlets spaced around the entry.
Automatic Air Ring for Thickness Control of Blown Film Extrusion. Elevate your plastic film extrusion line’s performance with cutting-edge film thickness control, delivering a uniform film gauge via air-modulated gauge control. Achieve consistent thickness.
The air cooling system is an integral part of any blown film line. It greatly affects not only the heat transfer from the molten polymer film but also the formation and stability of the bubble.
Blown Film Properties Purchasing Production Maintenance Raw Material Properties MW MWD Density Processing Conditions Output Melt Temp FLH Equipment Malfunctions Die Size Die Gap Ai Ri Branching Additives BUR DDR Air Ring IBC Collapser Crystallinity & Orientation Impact Strength Optics Tear Strength Shrinkage Modulus Tensile Strength Barrier ...
The addition of a second air ring above the first one can increase bubble cooling capacity by 30%. It can also improve film properties if you choose the right extrusion conditions. In blown film extrusion, external haze tends to be re-duced when the frost line is high. MD tear strength and dart impact can im-prove as well. Gear pumps are ...
Rotating the die and/or air ring as shown in Figure 5 can help mask errors built into the melt by process faults which cause variations in the film thickness, called gauge bands. By rotating the die and air ring, the gauge bands can be moved around the surface of the film as the bubble is extruded. The bubble itself does not rotate.
