Cap Excessive Height Inspection  


by Fiber Optic Photosensors


Cap’ excessive height may be inspected by mean of a superimposed barrier of 2 thin-beam LASER photosensors. In the reality, the intrinsic quality of the ensemble bottle + closure, is a determinant limiting factor of what really can later be inspected.  The fluctuations of the height of each one member of the populations of bottle and closure, limit the minimum difference of height that it result really possible to detect

Introduction

Closures’ excessive height, a symptom of open or leaking bottle, can be also inspected coupling a fiber optic trigger photo sensor to a second superimposed fiber optic photosensor, both in the barrier version with:

  • projector and receiver; 
  • thin beam (1.5 – 2.0 mm).

In this application, the second and upper fiber optic photo sensor, has the possibility of continous adjustment along the vertical axis.   

  Cap’ excessive height may be inspected by mean of a superimposed barrier of 2 thin-beam LASER photosensors. In the reality, the intrinsic quality of the ensemble bottle + closure, is a determinant limiting factor of what really can later be inspected.  The fluctuations of the height of each one member of the populations of bottle and closure, limit the minimum difference of height that it result really possible to detect



Advantages

  • extremely cheap price of the parts;
  • parts available always and wherever;
  • installation does not need a specialist;
  • operation does not require any prior training.



Disadvantages

On appearance, it’d be an excellent solution to detect mal-positioned or too-high closures. In the reality, the intrinsic quality of the ensemble bottle + closure, is a determinant limiting factor of what really can later be inspected.  

The fluctuations of the height of each one member of the populations of bottle and closure, limit the minimum difference of height that it result really possible to detect. Then, as an example, consider the figure below, showing a couple of bottles filled in Aseptic ambient with a notorious tea. A beverage made sensible by the fact that no preservatives were added. The cap on the bottle at right side is ~ 2.5 mm higher than the one at left side, we are considering fiducial.  It shall not be possible to reject the bottle at right side with a rejection ratio >80 % when the associated false reject ratio is < 0.01 %.   On practice, poor performances.    Perfomance limits set for:  

  • medium-to-high quality of glass bottles closed with metal closures, to > 1.0 mm;
  • PET bottles closed by PET caps, to > 2.0 mm.


  A couple of bottles filled in Aseptic ambient with a notorious tea. A beverage made sensible by the fact that no preservatives were added. The bottle at the right side is dangerously open. The cap on the bottle at right side is ~ 2.5 mm higher than the one at left side, we are considering fiducial. It shall not be possible to reject the bottle at right side with a rejection ratio > 80 % when the associated false reject ratio is < 0.01 %.  





Links to other pages about Closure Inspection:


                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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