Production yield analysis in food processing. Applications in the French-fries and the poultry-processing industries

Food processors face increasing demands to improve their raw material yield efficiency. To really understand the raw material yield efficiency of food processing, mass losses need to be divided in wanted (desired) and unwanted ones. The basic approach to increase the raw material yield efficiency is to mini mise unwanted mass losses at source. Wasting raw materials should be avoided, because the largest proportion of the overall business costs is associated with the purchase of raw materials. This wasting will therefore put the company's pro fit under pressure. From a sustainability point of view, it is also important to transform raw materials efficiently into final products. There is an increasing interest to find appropriate measures to track the yield efficiency of food processes in order to guide organisational actions to reduce unwanted mass losses. Many unwanted mass losses are hidden and need to be explored to make the management fully aware of these losses and the corresponding economic impact. Poor practice, poor maintenance, outdated equipment and technologies must first be visualised before they can be corrected.A new dimensionless number (called Yield Index) was developed to measure the true raw material yield efficiency of a transformation process. To measure the Yield Index, a food processor should measure the actual production yield and compare this with the maximum production yield. However, for many food processors the maximum production yield is unknown because of the lack of knowledge. With a systematic approach and considerable research effort it is possible to build a model that can predict the maximum production yield with respect to raw material parameters, additions and final product specifications. This model can then be used to pinpoint unwanted mass losses in the production process. The thesis describes in a comprehensive way the development of two models to estimate the maximum production yield of French-fries production and poultry-proc