Trimloss last updated

17th January 2018

by Julie Moorcroft

Moorcroft Computer Services

Thinking clear       Thinking software

Thinking Trimloss


by Julie Moorcroft

Moorcroft Computer Services


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Purchasing Mistake 16 - Undersize Toughening



One of the most heartbreaking mistakes, is when buyers are tempted to buy a toughening plant that they can afford rather than one that is large enough to operate efficiently.  The most critical dimension is not the bed length, but the bed width.  If it is too small, then not only will many order items still have to be bought in, but the bed loading efficiency may drop dramatically.  It is often a little known fact that empty space on a bed load has energy consumption costs roughly half as much as space occupied by glass being toughened.  Not only that, but erratic bed loading can lead to hot and cool spots in the furnace, even on modern plants with cool air system to try to compensate, leading to degradation in toughening quality.   A plant that is too small for the order sizes being toughened is therefore much more expensive to run per square metre of glass being toughened.  

It is not only toughening plants where the consequences of the range of order sizes, is not fully appreciated.  On a frightening number of occasions we have seen sealed unit lines with an uncomfortable limit on the maximum size of unit that can be processed.  This often leads to the purchase of a second line with a more realistic limit.  

For typical replacement glazing work, we would recommend a bed width of at least 1350mm but 1500mm is much better.  We have seen three toughening plants with a bed width of only about 1000mm.  This would be adequate only if door panels were being toughened but for anything else, this size is a huge mistake.  


There is an increasing trend to purchase automatic arising lines, but these tend to have a lower size limit which is too large for the smallest leaves, so capital and shop floor space still needs to be found for a manual arising station.  

Finally, there is usually a lower size limit on the assembled spacer frames being sent through an automatic butyler, making it necessary still to find capital and shop floor space for a manual butyling station.  

A full Trimloss system can take account of all the above limitations and reroute work or highlight items for manual processing where necessary.