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The term BUR in extrusion and calendering of thermoplastics refers to _______

a) Blow Up Ratio
b) Bauxime Up Ratio
c) Bottom Upper Ratio
d) Bottom Up Ratio

Answer: a
Explanation: The term BUR in extrusion and calendering of thermoplastics refers to Blow Up Ratio. It is the ratio of bubble diameter to die diameter. BUR for most blown films in packaging generally lies between 2:1 and 4:1.

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