X-Ray Detection


 
 

How detectable are we with X-Ray Detection Systems?

 

**Customer Feedback** Received 24/10/2011

From:
Sent: 24 October 2011 16:34
To: Sean R. Smith
Subject: X-ray detectable plastic

I used butter 45mm deep. I cut up one of your pens and flattened out a side wall section, it measures 1mm in the path of the X-ray beam. I tested the plastic on top of the butter (additional) and then again embedded in the butter. The results were very good.

The butter itself has an average pixel value of 75 points. 1mm plastic additional gave a value of 43 points – so contrast is 32 points (very good) and 1mm plastic embedded gave a value of 52, a contrast of 23 points (still very good).

To give you an idea of what this means – 1.0mm of this plastic embedded is equivalent to 2.5mm Soda Lime Glass embedded.

**Customer Feedback** Received 03/10/2011

From:  
Sent: 01 October 2011 03:40
To: Sean R. Smith
Subject:
X-ray & Metal detection tests

Hi Sean

Just a quick update I did some more testing this week on the x-rayable & metal detectable products. I managed to test the x-rayable bandaid in the glass line x-ray & found that it rejected it 100% of the time. The three metallic strips within the bandaid were very clear on the machine, although the remainder of the bandaid was invisible on the image. This is obviously because the plastic is so thin & light weight. The x-ray was playing up, so I couldn't spend any more time on it (hopefully more testing next week).

I then took the various samples -pen, bandaid, bag tag, cable tie, hairnet & glove to one of our metal detectors & ran them all through the machine. (Safeline Profile metal detector).

The results were stunning. All samples were 100% detected & rejected- even the tiny little bandaid. The indicator on the screen of the detector went from green to full red bars (off the scale) showing me that it was very easily seen by the machine.

I'll keep in touch with further developments

 

**Customer Feedback** Received 19/09/2011

From:  
Sent:19 September 2011 05:17
To: Sean R. Smith
Subject: X ray
images

Hi Sean

Here are some of the images of plastic that I tested in our glass line x-ray. The results were very exciting, and quite clear images from the machine. We were able to reliably detect down to a 3mm piece. I have sent this & the presentation you sent through on to the head of quality.

These images were taken at 550 jars per minute on a Quad beam x-ray. I firstly tried the plastic in water, then on the smallest piece I actually had it in the product (Seafood sauce) to really test out the plastic's limits. Jars are 250 gram of 1.5mm wall thickness.



**Customer Feedback** Received 31/08/2011

From:  
Sent: 31 August 2011 07:54
To: Sean R. Smith
Subject: Re: X ray

Hi Sean

I carried out some very brief tests of the new improved x-rayable plastic, via a chopped up pen and plastic scraper

The machine has been tied up with a technician so I haven't been able to get images but the results were fantastic for the blue plastic. The images were much stronger than the initial pen that I tested, and even the thin plastic of the scraper (2mm wide) was seen every time which was very encouraging.

A  26mm x 10mm x 2mm  (scraper edge) 100% pass

B  8mm x 8mm x 10mm (end button) 100% pass

C  8mm x 8mm x 28mm (hollow tube – hence less dense)  100% pass

D  13mm x 6mm x 3mm  (small clip) 100% pass

 

 


 

As X-Ray machines have an advantage of over metal detectors in being able to detect a wider range of foreign bodies - this is because the foreign body must be significantly different from the food material in X-Ray density in order to be detected.

 

So in practice an X-Ray machine will be able to detect items such as glass, metal, stones, bone and some denser plastics, for example PVC.

Plastic films, paper, cardboard, wood, insects, string or fruit stones will not be picked up!

 

The Line Scan System is the most popular system to be used in food processing plants. These systems have an array of individual sensor elements which pick up a difference in X-Ray density. They can work at high line speeds.

 

Limitations which may effect Detectamet products include :

Product packs such as glass or metal themselves X-Ray dense, and the size, shape and orientation of the foreign body.

 

Advantages include :

The ability to detect non metallic contaminents or part such as Detectamet plastics, rubbers etc, high sensitivity when used in conjunction with foil containers, and the fact that they are unaffected by moisture content (remember Detectamet products work better in a WET environment when used in conjunction with Metal Detection Systems).

 

X-Ray machines are coming down in cost and though they are still relatively expensive they are a useful tool to have for checking batches of product when contamination is suspected.

 

There are also many low tech ways of removing foreign bodies which can be implemented into your factory "due diligence" procedures.

All Detectamet products come in BLUE as standard for visual recognition.