Revisão das instruções gerais Nestlé
: gestão de peso líquido

  • Catarina Alexandra Saraiva Simão (Student)

Student thesis: Master's Thesis


The traineeship Master in Food Engineering was held in multinational Nestlé, more precisely in the Quality Department of Nestlé Port Factory. The quality control at the factory involves the control of various parameters before the release the products to the market, including the net weight of the product. Beyond the Law- Decree Nº310/91 on legislative principles for the marketing of pre-packaged products as regards the standardization of quantities and nominal capacities and nº1198 Decree / 91 of 18 December with regard to the regulation of metrological control the quantities for pre-packed products, Nestlé still has internal rules stricter so that is always maintained good brand image as well as the quality assurance of compliance. In this context, and Nestlé the need for revision of the Nestlé General Instructions with regard to the net weight, was then proposed as an internship subject to their review. The General Instructions Nestlé reviewed included five volumes, namely: Introduction to the subject; legislation and specification of net weight; monitoring and checking the net weight; release of the end product and auxiliary calculations. The statistical analysis of main results showed that in products in which the median standard deviation showed a higher value, the variability of weights between batches weighing was more irregular, reflecting the process capability as poor or very poor. At the origin of the variability between batches of weights may be as dose ratios of filling heads being different from head to head, the speed at which the grain falls or irregularities in the filling line of the carpet, among others. Monitoring tare resulted in corrective action proposed in particular, changing the number of times and times to perform the monitoring and the number of packages used in the calculation of tare. It was developed a proposal to amend the technical instruction in which it was proposed to tare monitoring pass once per turn, to twice per turn, at the beginning and end and checking the boot 6 followed containers that pass in the Company and are analysis on an analytical balance after 30 scan in 30 minutes in a pack, and the end of the turn followed by a further 6 containers. Overall, verification models are designed for controlling and for Analytical balances.
Date of Award27 Apr 2015
Original languagePortuguese
Awarding Institution
  • Universidade Católica Portuguesa
SupervisorNuno Ferreira (Supervisor) & Ana Maria Gomes (Co-Supervisor)


  • Mestrado em Engenharia Alimentar

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