tellefsdal AUTO WRAP 1200 EH, Руководство пользователя

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3.0 GENERAL INFORMATION ON BALE WRAPPING.
3.1 THE PRINCIPLE.
The advantages of round bale ensilage are many, and include fewer feed units, a flexible harvesting
system, large capacity and the possibility of selling feed units.
In principle, the same fermentation processes occur whether the fodder is placed in a silo or pressed
into bales and packed in plastic, i.e. lactic acid fermentation in anaerobic conditions. The oxygen in
the bale must be exhausted before fermentation begins.
The grass should be dried to approximately 30-40% solid content. The solid content can be
determined by twisting the grass by hand. If drops of liquid are forced out of the grass, the solid
content is less than 25%. Low solid content, (wet grass), can lead to increased butyric acid
fermentation if preservatives are not added to the grass. If the solid content is too high, (over 50%),
normal fermentation will not take place and there will be enough oxygen in the bale to produce mould
fungus.
3.2 THE BALE PRESS.
It is vital that the bale press produces compact, well-formed bales, as misshapen bales can be
difficult to pack. Pressing will also often take longer, thereby increasing the amount of plastic used.
3.3 DIFFICULT BALES.
When a misshapen bale is packed, it will have a tendency to move outwards or inwards on the rollers.
If the bale begins to move outwards, the machine must be lifted slightly at the rear edge to get the
bale to rest against the support rollers on the main frame. It can therefore be useful to use a hydraulic
top stay to make this adjustment easier. (See chapter 4.2).
If the support rollers almost disappear into the bale the machine should be pressed down slightly at
the rear edge in order to remove the bale from the machine. The plastic can be damaged when
friction against the rollers increases. Best results are achieved when the bale rolls easily against the
support rollers all the time.
If the bale to be packed is conical you must ensure that the sharp end is pointed at the tractor. It will
then be easier to get the bale to lie correctly during packing. It is easy for such a bale to "turn" forward
in the direction in which it is pointing, and therefore lie against the support rollers. If the bale is lying
on a slope it must be picked up from the lower side. A hydraulic top stay will again be advantageous.
3.4 TYPES OF PLASTIC.
A good type of plastic with good adhesive properties, and which is recommended for bale wrapping,
must be used. The thickness of the plastic foil should be at least 25 µ. (25/1,000 mm). In order that
the plastic tightens sufficiently around the bale, it is stretched before being wrapped, so it is somewhat
thinner when it is put on the bale. With short-term storage, (up to eight weeks), it is recommended
that bales have a minimum of four layers of plastic at the thinnest points, with at least 52-53%
overlap.
For long-term storage, or when the grass is wet when it is packed, the bale should have 90-100 µ
plastic, (6 layers), and the same amount of overlap. If thinner plastic is used, more layers should be
applied. If it is very hot the plastic will be stretched further, and more layers should be applied. It is
better to have slightly too much than too little plastic on the bale.
From experience, light plastic produces slightly lower temperatures within the bale, and tends to
improve feed quality.
* Emergency stop: see chapter 2.1
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