WRAPPING UP ROLLS – HOW MANY LAYERS?
An amount of layers of the foil applied for wrapping pallets up is one of the most important factors by production. Using many layers of the foil is creating better protective layer. And so a question how many classes of the foil should be applied is arising in order to stop the access of oxygen to the silage at simultaneous holding of lower costs the output.
TWO, FOUR OR SIX LAYERS OF THE FOIL? WHAT ARE RESEARCHES SAYING ABOUT THIS SUBJECT?
Generally for baling of the silage it is recommended to the high-quality foil four layers being applicable, however there are cases, when it is necessary to apply six layers: densely broken rolls with a large stake of a dry matter, baling of thick plants and baling of the silage to fodders of horses.
RESEARCH 1
They conducted research at the Institute of Meadow Crops and environment tests (IGER) in Wales. Tests were held in a standard agricultural farm, green fodder was bale directly on field and next transported to the place of storage. Results (table 1) are portraying the difference in airtightness and covering the silage with the mould at 4 and 6 layers of the foil.
TABLE 1 - THE INFLUENCE OF THE AMOUNT OF LAYERS OF THE FOIL ON THE AIRTIGHTNESS OF THE ROLL AND THE QUALITY OF THE SILAGE
|
Amount of layers of the foil |
4 |
6 |
|
Bell* airtightness (seconds) |
73 |
150 |
|
% of coverage with the mould |
1.8 |
0.8 |
|
Energy value (Mj/kg of a dry matter) |
9.9 |
10.1 |
* Airtightness of the roll calculated based on the time in which air about the normal atmospheric pressure returned to the roll after creating a vacuum in it. For them higher result, all the more tight roll.
FOIL FOR BALING OF THE SILAGE
The assortment of the appropriate foil for baling has first-rate meaning at the production of the silage. The foil should fulfil three essential conditions:
- good mechanical strength
- the top stair of the viscosity
- she should be immune to the influence of the UV radiation provided by the sunlight
RESEARCH 2
In next conducted test by IGER, 16 standard turns of the wire-wrap tool which so far were being used for wrapping up 4 layers of foil was reduced to 14 trades but next compared to 16 and 17 turnovers. At 14 trades rolls obtained 2 layers of the foil, however at a lot of turnovers a recommended amount of 4 layers was get.
TABLE 2 - INFLUENCE OF THE NUMBER OF TRADES OF THE WIRE-WRAP TOOL ON THE QUALITY OF THE SILAGE
|
Number of trades baler |
14 |
16 |
17 |
|
Listeria (number/g of the silage) |
61.000 |
2.250 |
688 |
|
Airtightness of the foil (seconds) |
68 |
124 |
130 |
|
Energy value (Mj/kg of a dry matter) |
9.8 |
10.0 |
9.8 |