CHECKS
Procedure to ensure no infi ltration of air in the material; to be performed before and after work:
Unscrew the spray cap; close the handwheel (pos. 9) and extrude a small bead of material measuring approx.
150-200 mm, checking that there is no infi ltration of air during extrusion; if air is present, still attempt to continue
with extrusion through to the end: if air bubbles persist, this means that the cartridge is defective; if air infi ltration
is minimal the gun may only be used for spraying as in this mode the air bubbles are not visible. Note that at the
end of work, the cartridge causing infi ltrations must be replaced with a new version, and the above check must
be repeated. When not used, it is essential that the gun does not still contain material and that there is no risk of
air infi ltration.
There are two additional methods to check if any air has infi ltrated the gun or cartridge itself; fi rst disconnect the
gun from the air supply, and ensure that pressure in the gun is completely discharged, by opening the jet adjustment
handwheel (pos. 9) and activate the fi rst trigger stroke:
1) Proceed in the same way as to insert a new cartridge, unscrewing the cartridge (pos.21) from the front base
(pos.8), and if a small quantity of material comes out of the cartridge, this is a sign that there are air bubbles inside,
which under expansion cause a small amount of material to be released.
2) Detach the gun and discharge the air as described above, then remove the cap (pos. 2 or 7), and ensure that
on activation of the trigger, both on the fi rst and second time, no material is delivered from the front nozzle, caused
by the presence of compressed air in the gun or the cartridge itself.
If one of these tests give positive results, replace the cartridge, or use until empty, then replace with a new
version. If the gun is blocked, it must be cleaned by dissembling and cleaning all lines where material has hardened
inside, taking care on reassembly that all threads are sealed with suitable thread locking compound, followed by
a test to ensure that the gun is 100% airtight. This operation should only be performed by skilled personnel, with
the maximum care to avoid damage to the gun.
If not adequately skilled, contact the retailer for assistance.
Air infi ltration can be caused by the following:
1) Incorrect tightening of the cartridge thread: the cartridge is tightened too securely onto the front base of the tube
support (pos. 8) with consequent damage (tearing) of the thread.
2) The cartridge is not suffi ciently tightened onto the front base of the tube support (pos. 8) so that airtight sealing
is not guaranteed between the front base of the tube support and the cartridge.
3) Infi ltrations of air between the cartridge gun and cartridge itself; in this case the cartridge is faulty and must be
replaced.
The gun trigger activates with a 2-stroke principle. The fi rst activation delivers air via the jet adjustment handwheel
(pos. 9) which obviously must be open, while the second stroke also activates material delivery. We therefore
recommend treating the part by testing the spray on a sample surface, to obtain the required effect, and once this
is achieved to continue with the process.
When the spray cap is fi tted onto the gun, ensure that the jet adjustment handwheel is open and air is delivered;
if the handwheel is closed, the spray cap may seize completely.
The special threaded cap means that the gun has both spray and extrusion functions. Ensure that the handwheel is
closed, to ensure no air in the bead; the compressed air supply only serves for the extrusion of material; the only
setting is as specifi ed, for product quantity only.
During relative short work breaks, leave the cartridge (not expired) in the gun; on re-use repeat the check for any
infi ltration of air. In the case of longer breaks, the cartridge should be removed and the gun should be cleaned,
together with all lines to remove any residual material.
OP 1338
CARTRIDGE SPRAY GUN (POLYMER MS)
