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Go to Test Rates Table - Click Here
All the
test rates in the Table Link Below are based on using holes made
using the 0.17mm (7 thou) wires obtained from Nordson ( normally
used for cleaning their glue gun nozzles).
For more
information in obtaining these wires please go to our
DOWNLOADS PAGE or click on the REAL TESTING DOWNLOAD
WHICH HAS PART NUMBERS FOR THESE WIRE AND PIN VICE to hold
them.
The
test rate of a container is governed by the following factors:
Volume. Generally our tester is not affected by volume as
much as standard designs on the market. Buy the physics of the
universe dictate that the pressure decay through a hole in a bigger
bottle just takes longer.
Shape. 2 bottle of the same bottle but different shape can
have very different test times.
Rigidity. A rigid bottle does not creep as much when tested
and generally, the more rigid the bottle the quicker the test time
will be.
Stability. If a bottle travels on the conveyor poorly and
sways when the conveyor starts and stops, the conveyor has to run
slower with a long acceleration/deceleration time. This costs
precious testing time.
Environment. In a temperature controlled production area the
temperature and humidity are controlled a tighter tolerance can bet
set, than in a tropical or sub tropical climate where the day/night
temperature variation can be 20-30 degrees centigrade. The above
mentioned video was done in summer on a hot day with a lot of
temperature variation in a non-insulated shed.
How
small a hole can we find?
The answer to this is
how much test time do we have available.
On the 1 litre oil bottle shown in the table on the high speed
machine the test time is around 0.45-0.5 seconds, with a pressure
drop of around 0.15 Kpa, by 2 seconds the pressure drop is > 0.4
Kpa.
So a hole smaller than 0.05 mm would take around 1.5-2 seconds to
create a pressure drop of around 0.1-0.15 kpa which we can easily
and consistently check with the typical variation in bottle
production.
Thus if you have the time holes smaller than 0.05 mm can be found.
In fact given time we have extrapolated that holes down to >
0.02 mm can be found.
Go to Test Rates Table - Click Here
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