Abstract
Blown film air rings are used primarily to stabilize the bubble and secondarily to cool the melt. They can affect maximum output, size range, or blow up ratio (BUR), gauge uniformity and range, optical properties and strength properties.
We have evaluated nine air rings for performance in production of general purpose clarity and high molecular weight, low density polyethylene (HMW LDPE) packag ing film. We find that selection of an air ring can affect the balance of optical and physical properties. We evaluated the air rings with five different resins, and found that the selection of an air ring should depend upon the resin to be used, and the properties to be emphasized.
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