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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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Q: What is Blow up ratio in film extrusion?
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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.


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