Technical Bulletin
Henkel TCS Department
26235 First Street
Westlake, OH 44145
1-800-624-7767
Technical Bulletin - OSI Foam Applicator Gun
– 20171003 Page
2
of
3
TROUBLESHOOTING
PROBLEM:
No product extrudes from the gun applicator when trigger is pulled, or product extrudes too slowly.
POSSIBLE CAUSE
SOLUTION
➢
Cured product at the tip of the gun can partially or completely block the
flow of the product
➢
Rub the gun tip on a piece of soft lumber, or use a knife, wire brush,
etc. to remove cured residue.
➢
Product is too cold. This will thicken the liquid in the can and reduce
the propellant pressure, resulting in a slower flow rate
➢
It is recommended to store the cans between 65-75°F (18-24°C) prior
to use. Maintain chemical temperature above 40°F (5°C) for best flow
rate. DO NOT heat cans with local heat sources (stove, radiators, hot
plates, etc.)
➢
Basket adapter may become clogged with cured foam product if gun is
stored without can attached, or if it not cleaned thoroughly when
changing cans.
➢
Foam gun may no longer be useable and needs to be replaced.
➢
Slow flow towards end of can may indicate a loss of propellant
pressure due to either cold temperatures or from dispensing foam
horizontally.
➢
Keep can vertical as possible during dispensing, with valve down. If
“spitting” or gas lose is excessive, shake can periodically as the can
empties.
➢
Regulating screw on back of gun is in closed position.
➢
Open regulating screw on back of gun by turning counterclockwise
➢
Product is past its shelf Life
➢
Shake can. If no liquid movement is felt (or product is very thick) then
it may be past its shelf life and needs to be replaced
➢
Product does not dispense after storage.
➢
Product was stored beyond 30 days after original opening, or product
has expired shelf life.
➢
PU foam leaks out of gun when it is off:
➢
Remove the canister, release the pressure and empty the foam
remaining in the applicator. Clean gun then remove and clean the
needle with OSI® Foam Cleaner (see above steps 5 and 6). If the gun
continues to leak the parts may be worn and the gun needs to be
replaced.
PROBLEM:
trigger will not depress
POSSIBLE CAUSE
SOLUTION
➢
Regulating screw on back of gun is in closed position.
➢
Open regulating screw on back of gun by turning counter-clockwise
➢
Cured product on needle valve may cause the trigger to stick.
Excessive force should not be used if trigger will not open readily, as
this may cause damage to parts
➢
If the needle valve cannot be dislodged using the trigger, it may be
able to be “broken free” by turning or carefully removing the regulator
screw being careful not to lose the spring and ball. Turn the needle
valve using a set of pliers. If this does not free the valve, then the
internal parts are clogged with cured foam and the gun needs to be
replaced.
PROBLEM:
Properties of dispensed product not acceptable or behaving unusually
POSSIBLE CAUSE
SOLUTION
➢
“Spitting” during dispensing or propellant bursts can be caused by not
keeping can vertical with valve down.
➢
Slight spitting can be expected. Excessive spitting is not normal. Keep
can vertical with valve down. Intermittent shaking of can is required to
keep the contents mixed properly. Aerosol cans must be shaken
during and in between work interruptions.
➢
Cured product on needle valve may cause the trigger to stick.
Excessive force should not be used if trigger will not open readily, as
this may cause damage to parts
➢
If the needle valve cannot be dislodged using the trigger, it may be
able to be “broken free” by turning or carefully removing the regulator
screw being careful not to lose the spring and ball. Turn the needle
valve using a set of pliers. If this does not free the valve, then the
internal parts are clogged with cured foam and the gun needs to be
replaced.
➢
The appearance of the dispensed bead of foam can be greatly
affected by the condition of the dispensing gun. Larger open celled
appearance may result if gun is not properly maintained. Also, product
that is left in the barrel of the gun, or allowed to get too cold may also
affect appearance.
➢
The initial burst of material from the barrel may be more open celled
than normal. If unacceptable appearance continues, then the basket
adapter may need a thorough cleaning. Test with a fresh can or
product that is at the proper dispensing temperature for dispensing.
