Guide to Stretchwrap usage based upon 4’ Round Bale Silage / Haylage

Guide to Stretchwrap usage based upon Mini Bales Silage / Haylage

How to calculate film usage
The number of bales that can be wrapped from a single roll of stretchfilm can be accurately calculated,
provided the following points are adhered to:

• THE BALES ARE 1.2m X 1.2m AND OF UNIFORM SHAPE.
• THE WRAPPER IS CALIBRATED FOR THE CORRECT NUMBER OF TURNS.

4 film layers 24 turns (500mm) or 16 turns (750mm)
6 film layers 36 turns (500mm) or 24 turns (750mm)

• THE FILM IS ACCURATELY AND CORRECTLY STRETCHED TO 70%.

If all the parameters are correct (bale size, film stretch of 70% and correct number of bale revolutions),
then the following figures will always be achieved.

Any variation to the above parameters will cause numbers to differ.

Given a standard bale size of 1.2m x 1.2m, applying film at 70% stretch using the correct number of turns for
the film width used (24 turns for 500mm and 16 turns for 750mm for 4 layers of film), the calculations are as follows:

A – BALE CIRCUMFERENCE (sum length of all four sides of the bale).
B – TURNS OF THE BALE.
C – FILM LENGTH AFTER STRETCH (film roll length plus 70%).

Multiply A x B and divide into C