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Blow up ratio is a number that refers to the ratio of a blown film bubble diameter to the extrusion die diameter. The blow up ratio can affect the polymer molecules.

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What is the actual formula of blow up ratio?

The formula for blow-up ratio (BUR) is BUR = (D1/D2) where D1 is the diameter of the extruder screw and D2 is the diameter of the die in the blown film extrusion process. The blow-up ratio determines the amount of expansion that occurs in the film extrusion process.


How do you measure Bubble Diameter in Blown Film Extrusion for bubble up ratio?

In blown film extrusion, the bubble diameter is typically measured using a caliper or other measuring device at the bubble's widest point, which is usually above the die. The bubble up ratio is calculated by comparing the measured bubble diameter to the die diameter. This ratio helps assess the efficiency of the extrusion process, as an optimal bubble up ratio contributes to uniform film thickness and quality. Accurate measurement is crucial for ensuring consistent film properties.


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