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FOOD SAFETY

Mettler-Toledo introduces advanced X-ray for ‘hard-to-find’ contaminants
Wednesday, 28 September, 2022, 14 : 00 PM [IST]
Royston, UK
Mettler-Toledo Product Inspection has launched its most advanced x-ray inspection technology to date, delivering a remarkable leap forward in the ability to detect low density contaminants in packaged food products. The new technology will help food manufacturers avoid product recalls, reduce unnecessary product waste costs and enhance product integrity and brand protection.  
 
State-of-the-art Mettler-Toledo DXD and DXD+ dual energy detector technology is optimised for identifying foreign bodies such as calcified bone, low-mineral glass, rubber and some plastics. These types of contaminants are traditionally hard to detect within the ‘cluttered’ or ‘noisy’ x-ray images generated by overlapping and multi-textured products such as packs of pasta, chicken breasts, sausages and frozen potato-based goods.  
 
Such applications are a perfect match for DXD and DXD+ advanced detector technology, in conjunction with intuitive new Mettler-Toledo Advanced Material Discrimination software tools. The software helps to separate and remove the prominent material of the food product within the x-ray image, revealing the presence of any lower density contaminants. As a result of the accuracy and reliability of DXD and DXD+ detection, food manufacturers can be more confident that their products are safe for consumers, and that they will benefit from reduced False Reject Rates and product waste, helping to deliver a fast return on investment.  
 
The outstanding performance of this cutting-edge technology has been shown in tests conducted by the company, in which a range of different foreign bodies were hidden in 650g packs of chicken breasts. The table below illustrates these results:
 

Contaminant type  

(embedded bone of 2mm thickness or less) 

Smallest size detected with 100% Probability of Detection (P.O.D) using single energy x-ray 

Smallest size detected with 100% Probability of Detection (P.O.D) using DXD or DXD+ 

Aluminium 

3mm 

2mm 

Low Mineral Glass 

3mm 

2mm 

Rubber 

6mm 

5mm 

Wish bone 

Undetected 

100% detection 

Rib bone 

Undetected 

95% detection 

Fan bone 

Undetected 

30% detection 


 
Detection of low-density contaminants was even more graphically illustrated in tests using a 500g bag of pasta:
 

Contaminant 

Size detected with single energy x-ray 

Size detected with DXD or DXD+ 

Aluminium 

5mm 

2mm 

Low Mineral Glass 

5mm 

3mm 

Rubber 

Undetected 

6mm 



 
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