Open Access Original Research Article

Addressing Package Voids on Extremely Small Leadframe Device

A. Sumagpang Jr., F. R. Gomez

Journal of Engineering Research and Reports, Page 1-7
DOI: 10.9734/jerr/2020/v16i417172

The paper focused in addressing the package voids defect of a semiconductor device utilizing an extremely small leadframe technology. Potential risk analysis and pareto diagram were completed to identify the top reject contributors and eventually come-up with the robust solution. A comprehensive design of experiments (DOE) was completed and solution validation was performed to formulate the effective corrective actions. Results revealed that package voids were addressed by optimizing the molding process focusing on the molding temperature and curing time. A significant improvement of 95 % for package voids reduction was achieved. For future works, the parameters and learnings could be used on devices with similar configuration.

Open Access Original Research Article

Technical Properties and Potential Application of Waste Engine Oil as Bitumen Modifier in Pavement Construction

Bamidele I. O. Dahunsi, Daniel U. Idusuyi

Journal of Engineering Research and Reports, Page 8-13
DOI: 10.9734/jerr/2020/v16i417173

The gradually exhausting crude oil reserves worldwide have made experts in the building industry to explore alternative resources for road construction materials. This study was designed to evaluate the potential applications of engine oil wastes as a bitumen modifier. The Waste Engine Oil (WEO) was obtained from an auto mechanic workshop. The base bitumen was replaced with WEO at 2, 4, 6, 8 and 10% respectively. The WEO modified bitumen properties which included penetration, softening point, flash point, solubility, specific gravity and viscosity were measured in accordance to ASTM standard procedures for a period of 5 days. From the results obtained it was observed that as the replacement level of the WEO increased, there was decrease in the viscosity, specific gravity, flash point and the softening point properties. Incorporating WEO into the base bitumen can at best be acceptable at 2% - 4%.

Open Access Original Research Article

Process Simulation for Crude Oil Stabilization by Using Aspen Hysys

Hussein Al- Ali

Journal of Engineering Research and Reports, Page 14-28
DOI: 10.9734/jerr/2020/v16i417174

A light fluid from different reservoir formation started recently to associate the production of the crude oil stabilization plant which is unfortunately not enough to release off all light components and as a results the true vapor pressure increased in the storage tanks more than 12 psi. From the results in Aspen Hysys, it was found that manipulating of working parameters for the existing plant likewise the inlet temperature, dry fluid flow rate, water flow rate and the temperature of the outlet fluid from Fired heater have no great effect on the true vapor pressure (TVP). The TVP at normal feed conditions of 50.5 C and for the plant with third and fourth stages are 14.96 Kg/Cm2. a and 10.23 Kg/Cm2. a, respectively. It was found that for the third stage, the changing in feed flow rates for both dry and water have no effect on the reducing TVP, while to stabilized the TVP for the exported crude oil within range of (68947.6 – 82737.1) Pa/(10 – 12) psia when the the fourth separator used in the process plant, the feed dry fluid flow rate (26.4 – 105.6) KBD, the minimum base sediment and water cut in the feed stream 4 Vol%, the inlet fluid temperature (43-51.5)⁰C and the differential temperature across the fired heater in range of (16-24)⁰C with feed temperature range (40-55)⁰C.

Open Access Original Research Article

Design and Construction of a Soil Moisture Measuring

A. A. Ijah, O. W. Bolaji, O. O. Adedire, J. Z. Emmanuel, N. E. Onwuegbunam, O. D. Oloyede, A. O. Afolabi

Journal of Engineering Research and Reports, Page 29-34
DOI: 10.9734/jerr/2020/v16i417175

A digital soil moisture reader was constructed and tested. It uses a lipo battery of 9v which was regulated to a constant 5v with the help of a voltage regulator 7805. The digital soil moisture reader developed was tested and the result obtained was compared with that obtained using the gravimetric method of determining soil moisture contents. In determining the soil moisture content, a certain quantity of soil was collected and a particular volume of water was added incrementally. The result shows that the soil moisture reader is accurate. The evaluation was carried out using the gravimetric method of soil moisture determination as a basis of comparison. Nine samples of 50g of soli were collected from Federal College of Forestry Mechanization Farm and a certain amount of water was added incrementally during the process of determining the soil moisture content. The soil reader was calibrated using the gravimetric method which shows a regression coefficient R^2 of 0.986 which indicates that the soil reader is accurate, sensitive and reliable.

Open Access Original Research Article

Ball Misplace Mitigation through Process Optimization of Advanced Leadframe Package

Bryan Christian S. Bacquian, Frederick Ray I. Gomez, Edwin M. Graycochea Jr.

Journal of Engineering Research and Reports, Page 35-38
DOI: 10.9734/jerr/2020/v16i417176

One of the challenging assembly processes in semiconductor manufacturing industry is stencil printing using solder paste as direct material. With this technology, some issues were encountered during the development phase of an advanced leadframe device and one of which is the solder ball misplace or off-centered ball. This paper, hence, focused on addressing the ball misplace issue at stencil printing process. Comprehensive parameter optimization particularly on the print speed and print force was employed to eliminate or significantly reduce the ball misplace defect at stencil printing process. With this process optimization and improvement, a reduction of around 96 percent ball misplace occurrence was achieved.