Theses and Dissertations - UTB/UTPA

Date of Award


Document Type


Degree Name

Master of Science (MS)


Manufacturing Engineering

First Advisor

Dr. Hiram Moya

Second Advisor

Dr. Rajiv Nambiar

Third Advisor

Dr. Douglas Timmer


Dairy operations suffer frequent stops. Product shrinkage is a consequence of downtime, which includes losses of packaging material, scraped finish product and capacity. This work proposes a troubleshooting methodology to identify causes of downtime, estimation of waste cost, and minimization of operation disruptions by applying a combination of a cost function to assess waste, and performance measurements. The drinkable yogurt process is evaluated to find the principal areas for wasted bottles and yogurt. In order to make a decision about which of those sources to address, a General Cost Function is used to estimate waste cost which include measurements that evaluate the entire process. Further performance measure analysis such as Squared Coefficient of Variation, Utilization, etc. indicated the necessary maintenance strategy to normalize the process. After the root cause of shrink was found, improvements were implemented and the performance of the station was assessed again to confirm results.


Copyright 2014 Maria F. Vargas. All Rights Reserved.

Granting Institution

University of Texas-Pan American