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

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in Food Packaging Technology by (63.0k points)
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

I got this question during a job interview.

My question is taken from Extrusion and Calendering in Thermoplastics topic in division Thermoplastic Polymers Properties & Processing of Food Packaging Technology

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Best answer
Correct answer is (a) Blow Up Ratio

The best 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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