Calculate blow up ratio from die diameter and layflat width or bubble diameter, or solve for layflat width, die size, film gauge and draw down ratio (DDR).
- All Unit Converters
- Extrusion Ratio Calculator
- Draw Ratio Calculator
- Melt Flow Rate Calculator
- BOPP Film Weight Calculator
- Stretch Film Weight Calculator
- Roll Length Calculator
Blow Up Ratio Formula
The following equation is used to calculate a Blow Up Ratio.
- Where BR is the Blow Up Ratio
- Df is the final tube diameter
- Dd is the die diameter
To calculate a Blow Up Ratio, divide the final tube diameter by the die diameter.
What is Blow Up Ratio?
Definition:
A blow up ratio is a term used in blown film problems to describe the ratio of the final tube diameter to the die diameter.
How to calculate Blow Up Ratio?
Example Problem:
The following example outlines how to calculate a Blow Up Ratio.
First, determine the diameter of the die. In this example, the die being used is measured to have a diameter of 5 inches.
Next, determine the final tube diameter. The final tube diameter made with this die yields a diameter of 6 inches.
Finally, calculate the Blow Up Ratio using the formula above:
BR = Df / Dd
BR = 6 / 5
BR = 1.2
