Trimloss last updated

17th December 2016

by Julie Moorcroft

Moorcroft Computer Services

Thinking clear       Thinking software

Thinking Trimloss

 

by Julie Moorcroft

Moorcroft Computer Services

 

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Off Cut Maximisation Feature

 

 

When optimising from a stock sheet at the end of a batch and the area of the stock sheet is at least 10% larger than the area of the remaining order sizes to be optimised, then the theoretical results from any optimiser should be the same for that last stock sheet.  The only difference comes in the way that the off cuts are fragmented throughout the optimisation diagram.  What Trimloss does in such circumstances therefore, is to switch to optimising the off cuts, so that as much as the off cut area can be forced into one large off cut wherever possible, thus making it more likely to be re-usable.  This off cut maximisation feature is just one more utilisation of mathematical decision theory in Trimloss.  

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When putting an unused third split of a full stock sheet back into stock, or when putting an off cut smaller than this back into stock, extreme care should be taken when the glass is any type of Low E.  As soon as a Low E glass coated surface is exposed to the air, its quality starts deteriorating rapidly.  It does this even quicker in cold and damp weather conditions.  The precise rate of deterioration varies with the individual Low E glass types, but as a general rule, we recommend that if you want to maintain high product quality, then any exposed Low E stock left over at the end of the day should be discarded.  This is not a problem with Trimloss, because these off-cuts are kept to an absolute minimum.  Other optimisation software may however, not be so diligent in minimising the area of such off-cuts returned to stock, especially if their off-cut management is limited only to those spanning the full height of the original stock sheet and wasting any smaller off-cuts.  

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In a batch requiring say 5 stock sheets of 4mm clear glass and there is need to use only 90% of the last sheet, then the last 10% of that sheet can mostly be saved using this Trimloss feature.  This represents a 2% saving on the whole run from this feature alone.  For other batches with different amounts of ordered glass to be cut from the last stock sheet, the savings from this feature can be even greater.  

Moorcroft Computer Services do not know of any other optimiser which has this feature.  What has been observed however, is that there are some optimisers which can be told to produce different versions of the last cutting diagram, leaving it to the computer operator to choose the one with the least area of unusable off-cuts.  This feature therefore will produce different results from different operators, none of which is going to be anywhere near as good as the results from Trimloss using this off cut maximisation feature.