Vetter Ultra Flat Bags 8 bar (116 psi) - Manual (Page 7)

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2.4 Description of the product
Vetter Ultra Flat Bags are made by hand from high quality raw ma-
terials so that after completion, a seamless bag is produced. The
semi-finished product is vulcanized under the influence of pressu-
re and temperature and by doing this the individual layers bond
to form an elastomer body. After production has been finalized,
each Ultra Flat Bag is subjected to a plant acceptance test within
the scope of quality assurance.
Material of the Ultra Flat Bags: CR/Aramide, hot vulcanized
Temperature resistance of Ultra Flat Bags:
Cold resistance -40 °C
Cold flexible -20 °C
Heat resistance long-term +90 °C
Heat resistance short-term +115 °C
The aramide layer on the Ultra Flat Bag can
be damaged by damage made to the bag
surface, e.g. cuts, cracks, punctures or by
the effects of ozone.
Therefore with a visual check after every operation, special atten-
tion is to be made to the following types of damage:
9 Damage by separation
9 Damage by cuts
9 Damage by punctures
9 Damage by heat and chemicals
Danger of bursting! If, when carrying out the
check, this type of damage is determined
then the bag is to be immediately taken
out of service. Repair is not possible.
In order to use the maximum lifting power, the total effective area,
i.e. the total area minus the edge area, must be completely under
the load to be lifted and that the bag must be taken to the maxi-
mum permitted operating pressure.
The bag develops a spherical shape (with rectangular or square
base) as the lift height increases. This is the reason why the con-
tact area with the load decreases until at a max. bag curvature this
will be almost zero. The largest lift height of the Ultra Flat Bag will
only be reached in the unloaded state.