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

Film Specification Approx. No. Bales Per Roll (4’ Bale)
 
6 Layers
4 Layers
500mm Wide x 1800m Long
17
26
750mm Wide x 1500m Long
22
33

Guide to Stretchwrap usage based upon Mini Bales Silage / Haylage

Film Specification Approx. No. Bales Per Roll (Mini Bale)
 
6 Layers
4 Layers
1800m Long x 250mm Wide
20
30

 

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 BALE SIZE ARE OF 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
FILM WIDTH
A
B
C
BALES PER ROLL
500mm
4.8m
(1.2m x 4 sides)
24

3,060m
(1,800m + 70%)

26.5
750mm
4.8m
(1.2m x 4 sides)
16
2,550m
(1,500m +70%)
33.2