Tama Assist Knowledge Stretchfilm Main

Film usage for round bales

The number of bales that can be wrapped from a single roll of stretchfilm can be easily calculated, providing all of the following points are understood and adhered to.

• THE BALES ARE OF UNIFORM SIZE AND SHAPE
• THE NUMBER OF TURNS IS CORRECT AND CONSTANT
    4 film layers – 24 turns for 500mm film and 16 turns for 750mm
6 film layers – 36 turns for 500mm film and 24 turns for 750mm
• THE FILM IS ACCURATELY AND CORRECTLY STRETCHED TO 70%

To calculate the correct figure, the three following factors must be maintained.

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%)

By using the following calculation, the total number of bales/ roll can thus be calculated

Multiply A x B and divide into C
Example 1. Bales with 4 layers film application
Film size A
Bale circumference
B
Turns of the bale
C
Total film length
Bales/roll
500mm x 1,800m 4.8m
(1.2m diameter x 4)
24 3,060m
(1,800m x 70%)
26
750mm x 1,500m 4.8m
(1.2m diameter x 4)
16 2,550m
(1,500m x 70%)
33
Example 2. Bales with 6 layers film application
Film size A
Bale circumference
B
Turns of the bale
C
Total film length
Bales/roll
500mm x 1,800m 4.8m
(1.2m diameter x 4)
36 3,060m
(1,800m x 70%)
17
750mm x 1,500m 4.8m
(1.2m diameter x 4)
24 2,550m
(1,500m x 70%)
33

Any variation in any of the following will alter the number of bales per roll.
• Bale size
When bale size changes, the calculation to determine correct and full bale coverage is

  1. Count the turns to completely cover the bale
  2. Add one more turn
  3. Repeat again for 4 layers (or twice more for 6 layers)

• Number of turns to the bale
Insufficient turns of the bale will result in a reduction in film layers on the bale, leading to the possibility of film splits after wrapping.
• Film % stretch
Most machines are correctly calibrated to 70% stretch, this can vary depending upon condition of pre-stretch rollers and roller gearing.

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