Theses and Dissertations - UTB/UTPA

Date of Award


Document Type


Degree Name

Master of Science (MS)


Manufacturing Engineering

First Advisor

Dr. Rajiv Nambiar

Second Advisor

Dr. Seokyoung Ahn

Third Advisor

Dr. Miguel Gonzalez


The effect of processing variables on the level of gas penetration in parts fabricated by gas-assisted injection molding from two different materials was compared. The materials used were polypropylene and stainless steel powder metal/thermoplastic feedstock. Software simulation and physical experiments were conducted. Taguchi analysis was used to reduce the number of experiment trials and to find the optimum processing conditions. Four different variables were changed using nine different combinations. The processing variables are the pressure, the delay time before gas is injected, the temperature of the material injected, and the amount of the material injected. The results showed that the most critical variable in the experiment is shot size followed by gas pressure, delay time and material.


Copyright 2009 Edna Orozco. All Rights Reserved.

Granting Institution

University of Texas-Pan American

Included in

Manufacturing Commons