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Leakage Inspection for Crown Caps
Among the inspection of underfilled bottles or bottles without seal or label, the inspection of leaking
bottles is an essential requirement to quality assurance in the beverage industry. Leakages influence
the quality and durability of products directly and thus are not acceptable for consumers or
Therefore leakage inspectors are standard products of quality management in the
beverage industry.
The acoustic technology of BBULL MAS/P is for indirect pressure measurement in
CO2 containing beverages. The MAS technology can be applied for glass bottles
with metal cap, that do not have any measurable deflection, e.g. beer bottles
with crown cork.
The acoustic sensor MAS works by applying an electromagnetic impulse
to the top of each container. The “pulse” is produced by a strong
electromagnetic pulse, which excites the container lid. The lid vibrates
at an individual resonant frequency “tone”, based on internal pressure.
The resulting “acoustic” signal is received by a microphone, digitally
sampled and stored in memory for processing. The pc-based processing
software produces a real-time signal spectrum and calculates the
resulting frequency of the “signal” for every lid.
Thereby the internal pressure is directly proportional to the vibration
frequency of the inspected container. Additionally the lid deflection is
inspected by „analogue proximity technology“. An electromagnetic proximity sensor produces a permanent magnetic field for monitoring the distance between sensor
and metal cap and produces a distance-depending proportional analogue voltage. The permanent proximity signal is digitally sampled for producing a performance-related value of the cap profile.
The profile value as well as the frequency value of the closure is compared with the user set limits of container format in which containers with a frequency response outside these limits are rejected.
   recognition of too little pressure / vacuum      recognition of missing compound
   recognition of too much pressure
     recognition of broken glass in the area of the neck
   recognition of cap leakage      recognition of cocked caps
   recognition of hair cracks    
For getting high measuring accuracy we recommend the maximum possible distance from the closer to BBULL MAS/P So there is enough time to set up a pressure inside the container which is reduced in case of leakages. Best results can be achieved in combination with a pasteurizer or after labeller.
Sensor bridge
Leakage inspection system BBULL MAS sensor bridge

The inspection principle allows the detection of leakers only when the
product specific pressure has been reached. This pressure is basically
depending on the CO2 -level or temperature of the product. A reliable
measurement is only possible when the pressure inside the faulty
bottles is decreased significantly to differ faulty bottles from good bottles.
To reach constant measurements we recommend maximum possible
distance from the closer to the BBULL MAS/P Leaking bottles must
reduce the internal pressure to differ constantly from good bottles .
Thus a statement of inspection reliability is always depending of the
installation place and is always related to the difference to the normal
pressure of good bottles.
The processing software of BBULL MAS/P is installed on a pc-based Inspection System.
BBULL offers the basic configuration with a BBULL PC-400 or PC-500 control unit, with 6,4” or 13" touch display with alphanumeric user interface. In combination with monitoring systems BBULL 5000 with 15“ touch and graphical user interface BBULL offers additional inspections like e.g. camera-based label or cap inspections.
Screen Shot: Leakage inspection system BBULL MAS - Click on the Image to enlarge it
Screen Shot:
bottle "good"
Screen Shot: Leakage inspection system STRATEC MAS - Click on the Image to enlarge it
 Screen Shot:
 bottle "bad"
   fill level Inspection
   label inspection
   cap inspection
   rejection system for faulty bottles
Inspection head
Brochure: BBULL MAS < PDF > < download > (ca. 0,9 MB)
Further details to the corresponding central operating, control and processing unit BBULL PC-5000 you will find < here >
  BBULL PC-400 you will find < here >
  BBULL PC-500 you will find < here >