MASCAR 5100 S, Руководство по эксплуатации и обслуживанию

Страница: 21 / 38

Wrapper 5100
4.4 FILM STRETCHER
fig. 10 - Stendifilm
The machine is fitted with a filmstretcher system
which unravels and tensions the plastic film.
4.4.1 SETTING THE FILMSTRETCHER
For successful ensilage, the bales must be
wrapped in the best way possible. This is ensured
by the correct overlaying of the film, and also by
the film stretcher which pretensions / stretches the
plastic film.
This system keeps the film stretching constant
and ensures that it is used efficiently.
The film, trailed by cradle rotation, has been
wrapped around two rollers, on which can be
modified the ratio of the rotation’s speeds.
The speed difference states the film stretching
ratio and has to be regulated on the grounds of
environmental conditions and film quality.
A stretching ratio of 70% is recommended with a
good quality film. If low quality film is used, is
recommended a stretching ratio of 50%.
If the film is not stretched enough, it does not
adhere properly to the bale and excessive film is
used, whereas if the film is overstretched, this can
compromise its physical and mechanical
properties, increasing the risk of ruptures or
perforation.
The stretching ratio is stated by substitution of the
pinion on the higher side of the film stretcher (fig.
11), in accordance with the schedule on the
adhesive (fig.12).
fig. 11 – Stretching setting
fig. 12 – Stretching ratios
The film stretching level depends on the used film
type and on the environmental conditions
(temperature and humidity).
So the data indicated on the schedule are
approximate, because only an experimental test
can state the exact film stretching level.
4.4.2 REEL HEIGHT SETTING
To get an optimal bale wrapping the film has to be
stretched passing always through the middle of
the bale.
The height of the film reel relative to the bale is
set according to the diameter of the bale and the
height of the film itself.
The wrapper is provided with a device, which
allows the quick setting of the filmstretching on 3
positions.
This operation can be effected as follows (fig. 13):
1- Loose the screws for the block (A);
2- Lift the lifting lever (B)
3- Press the block bar (C)
4- Reach needed position lifting and
lowering the lever (B)
5- Tighten the screws for the block (A)
USE & MAINTENANCE MANUAL - 21 -