80
-
5 Operation
Outgassing of products
To avoid problems due to outgassing of products, use low dispense pressure and longer dispense
timing for your process whenever possible. In addition, it is helpful to depressurize the dispense
valve at regular intervals.
If possible, reduce the valve closing speed (refer to operating manual of relevant dispense valve).
High viscosity products
Use a feed line with larger internal diameter for dispensing high viscosity products. Instead of
using a ¼“ feed line, use a
⅜
“ feed line. Feed line Kit No.
97220
, order no. 135561, is available
for this purpose.
Use a larger, conical dispense needle, e.g. needle PPC18GA, ID -
ø
0.84 mm, green (No.
97222
)
or PPC16GA, ID
ø
1.19 mm, gray (No.
97221
), otherwise the amount of product dispensed will
be insufficient.
Separation of products
To ensure optimum adhesive strength, the product should not be allowed to separate. Use only
small containers holding the amount of product consumed during a shift or a day to minimize
separation.
Avoid angled fittings for product connections, e.g. to the dispense valve. Use straight fittings
only. Care should be taken to run the feed line properly, with a wide radius.
Thixotropic products
Prolonged idle periods will change the flow behavior of a thixotropic product due to its chemical
properties. As a result, the amount of product dispensed will be reduced. To compensate for this
phenomenon, run 2 – 3 dispense cycles before returning the system to operation.
Start settings
Small drops
Medium-sized drops
Big drops
Dispense
time
in seconds
Dispense
pressure
in bar
Dispense
time
in seconds
Dispense
pressure
in bar
Dispense
time
in seconds
Dispense
pressure
in bar
Low viscosity products up to
125 mPas (like fruit juice)
Cyanoacrylates and
anaerobics,
e.g. 401, 406, 496, 290
0.5
0.2 – 0.6
0.5
0.5 – 1.0
1.0
0.5 – 1.0
Medium viscosity products
up to 1,000 mPas (like heavy
oil), Cyanoacrylates and
anaerobics,
e.g. 243, 270, 480, 648
0.5
0.5 – 1.0
1.0
0.5 – 1.0
1.0
1.0 – 2.0
High viscosity products up to
10,000 mPas (like honey)
Cyanoacrylates and
anaerobics,
e.g. 326, 330, 572, 573, 574,
638
0.5
0.7 – 1.2
1.0
1.0 – 2.0
2.0
1.0 – 2.0
Paste and gel-type products
Cyanoacrylates, anaerobics
and silicones,
e.g. 454, 510, 660, 5088.
0.5
1.2 – 2.0
1.0
1.7 – 2.5
2.0
2.0 – 3.0