plastic cap visual check wi med-2



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Introduction

The optic closure inspection is the most modern, comprehensive and satisfactory way to control closures’ status, its only disadvantages being cost and complexity, as seen by the user side.   It is devoted to detection of cocked (inclined) closures, broken TE (tamper evident) bands, closures applied too high or absent at all.   Factors implying contamination of the product and extremal risks for Consumers.  The basic operation principle implies a single CCD or CMOS-camera, allowing a partial coverage, < 180º, of the closure external lateral surface.  The optic system includes 3 mirrors to increase the focal length, minimising optic aberrations due to parallax error.   The optic axe is centred on the neck ring.  


Why 2 cameras

This optic arrangement presents evident limits when trying to detect broken Tamper Evident Rings.   That’s why 2-cameras systems, like in the figure at left side, are mandatory to prevent this occurrence.  Also, with two cameras it results possible to check nearly 360º of the cap external surface.  

 


 The broken Tamper Evident Ring of a sport cap.  The defect is macroscopic and surely assured detected at nearly 100% but the situation worsen rapidly for defects ~6 times smaller.  In these cases, a double camera system reveals its superior detection ratio



Whatever the model, a strobo flasher, today low-voltage model or IR LED matricial model, illuminates the bottle’ external sidewall, neck and closure.  In case of low-voltage strobo flashes, em energy amounts to a few tens of joule, irradiated along approximately 0.1 m.    With so short illumination times, also images of fast moving objects results crisp and frozen.   Be a similar system composed of 1 or 2 cameras, the detection ratio results however relatively poor with respect to the modern final inspection systems.   These last adopt 2 - 4 cameras and mirrors in an improved optic diagram, to precisely image the neck and cap area of the bottle.



Broken Tamper Evident Rings, missing and inclined cap, cap too high or too low are the controls most commonly performed by mean visual cap camera systems.  Double camera systems present images of the same neck as seen by two opposite sides

 Broken Tamper Evident Rings, missing and inclined cap, cap too high or too low are the controls most commonly performed by mean visual cap camera systems.  Double camera systems present images of the same neck as seen by two opposite sides


  Malpositioned Caps and Broken Tamper Evident Rings detected by mean of a couple of cameras anti-parallel oriented.  Image shot by our staff at Font Salem, Valencia, Spain; a Company part of Grupo Damm


Links to other Closure controls:




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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