4.2 Insufficient vacuum:
4.2.1 Leakage in the bag:
Most frequently, insufficient vacuum in bags is due to leakage in bag and not due to any
fault of the machine.
Pin-hole leak for which there is no obvious explanation is due to faulty bag material.
Pin-hole leak caused by sharp edge of the product (bone, etc.).Use bone-guard or
thicker film.
Tear in bag by careless handling (sharp edge on filling table, damage made by retailer
or customer).
Leakage in lateral or bottom seal, complain to supplier of bags or film.
4.2.2 No leakage in the bag:
Bag is too large, therefore the surplus of air remains visible (there is surplus of air in
0.4% of the bag volume in each bag). Use bags of suitable size.
Vacuum level is too low:
Pressure bar is jammed and closes opening of bag during evacuation.
4.2.3 Insufficient vacuum in chamber:
If troubles described under 4.2.1 and 4.2.2 do not apply, there is something wrong with
the evacuation.To find the leakage quickly, check for leaks with a precision vacuumeter,
going back step by step from the chamber to the pump.
At the chamber (measuring point at base of valve) at maximum time of evacuation. If
more than 6 torr, proceed directly to the pump, if more than 3 torr:have pump service by
pump supplier.If pressure at pump is good, reconnect hoses to pump and measure
again.
Verify at vacuum hose connections and valve connections.
When proceeding this way, starting from pump, loss of pressure per step must not
exceed 0.5 to 1 torr.
Caution:Verify connections of measuring equipment before verifing machine.
Most frequent points of leakage: lid gasket, damaged vacuum hose or loose hose
clamps.
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