Why Inner Sidewall Inspection

The inner surface of the bottle may host larvae, insects and other low-contrast foreign objects whose detection, as seen by the External Sidewall is nearly impossible.    Applying a wide-angle fish-eye multiplet (see the figures here on right side and below) to a CMOS or CCD camera, in the configuration yet seen for the Base inspection, results in the Inner Sidewall Inspection.  A vantage point of view toward areas like the:

  • neck, where otherwise the defects’ detection is made poor by the diffraction due to glass curvature,
  • back of external serigraphs, invisible to all External Sidewall Inspections.

Inner Sidewall Inspection typically detects defects because of the:

  • obstruction they create to the passage of light thru the sidewall glass (high grey levels);
  • reflection of the defect on the curved inner surface of the bottle, so that the defect looks much bigger than its real dimension.


Also, the Inner Sidewall inspection is the most efficient system to detect plastic transparent foils.  An example of these are those folding the packs of cigarettes. In this task it is surely superior to the Base Inspection for Semi-transparent defects, because of the same optic effect hinted before. 

Plastics’ foils look much bigger than they really are:  

          2 – 10 times bigger.

   Typical aspect and rationale for an inner sidewall inspection. A sequence of concentric symmetric circles, associated in adiacent groups to reduce the probability of undetected defects because lying over separate adiacent areas

 Inner Sidewall inspection adopts visible light like an instrument. Visible light 100 million times more energetic than Infrared and 100 times less energetic than, i.e. the X-rays used for the Fill Level, Case and Crate Inspections

                                                Wide-angle fish-eye multiplet lens systems are the choice for the Inner Sidewall Inspection

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This website has no affiliation with, endorsement, sponsorship, or support of Heuft Systemtechnik GmbH, MingJia Packaging Inspection Tech Co., Pressco Technology Inc., miho Inspektionsysteme GmbH, Krones AG, KHS GmbH, Bbull Technology, Industrial Dynamics Co., FT System srl, Cognex Co., ICS Inex Inspection Systems, Mettler-Toledo Inc., Logics & Controls srl, Symplex Vision Systems GmbH, Teledyne Dalsa Inc., Microscan Systems Inc., Andor Technology plc, Newton Research Labs Inc., Basler AG, Datalogic SpA, Sidel AG, Matrox Electronics Systems Ltd.

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