Coulter J.P. – TechConnect Briefs

The Influence of Different Concentrations of Orotic Acid on the Poly- Lactic Acid Crystallinity Development During Vibration Assisted Injection Molding

Alzahrani F.J., Gao P., Duhduh A., Coulter J.P., Lehigh University, US

This research investigated the effect of the addition of different concentrations of Orotic Acid (OA) on the crystallization kinetics of Poly-lactic Acid (PLA) in non-quiescent conditions. DSC technique was utilized to capture the crystallinity, melting [...]

Experimental and Analytical Analysis for Advanced Hot Runner Based Injection Molding

Alqosaibi K., Thakur C., Noor H., Almalki A., Duhduh A., Coulter J.P., Lehigh University, US

A novel technology “Rheodrop” was developed to advance the process of hot runner based injection molding. The technology applies controllable shear rate to the polymer melt during and between injection molding cycles. The application method [...]

Vibration Assisted Injection Molding: An Innovative Energy Efficient Processing Technique for Poly-Lactic Acid (PLA) with Enhanced Properties

Gao P., Duhduh A., Xing J., Kundu A., Coulter J.P., Lehigh University, US

This work is focused on the development of time and energy efficient injection molding processing strategies to fabricate semi-crystalline plastic components with enhanced properties. A Vibration Assisted Injection Molding (VAIM) process was devised for this [...]

Investigation of Bulk Metallic Glass Tooling Lifetime for Microinjection Molding

Almalki A., Rajhi A., Noor H., Kundu A., Coulter J.P., Lehigh University, US

The lifetime of a commercially available zirconium based bulk metallic glass (BMG) for microinjection molding (μIM) was investigated in this research. The primary objective was to understand the effect of the molding conditions on the [...]

Investigation of Fidelity of Micro Molded Features Using Microinjection Molding Process

Rajhi A., Almalki A., Coulter J.P., Lehigh University, US

This paper investigates the influence of selected processing parameters of microinjection molding on the replication fidelity of micro molded features. Parameters were altered in order to find to what extent the microfeatures can be stretched [...]

Investigation of a Hybrid Hot Runner System to Increase the Efficiency of Injection Molding and Improve the Quality of Molded Parts

Alqosaibi K., Thakur C., Duhduh A., Kundu A., Coulter J.P., Lehigh University, US

Hot runner systems are prevalent in the manufacturing of thin walled polymers parts. There are great challenges in industries associated with the quality of the molded parts when utilizing a hot runner system. One of [...]

Apparent Tissue Modulus for Micro/Nano Pillar Arrays

Rajhi A.A., Coulter J.P., Jedlicka S.S., Lehigh univeristy, US

Polymeric culture platforms with micro/nano topographies have provided a powerful approach to modulate cell to substrate interactions. Cells respond to chemical and mechanical signals from surrounding microenvironments. While chemical signals have been well studied in [...]

The impact of the “4d-Rheoprinting” additive manufacturing technique on molecular orientation and thermal properties of polymeric parts

Duhduh A., Coulter J.P., Lehigh University, US

This paper discusses a novel additive manufacturing technique that was developed in order to 3D print polymeric parts with tunable properties. This technique, known as 4D-Rheoprinting, can be applied to a number of common additive [...]

Additive “4D” Rheoprinting for the Manufacture of Enhanced Biomaterial Products

Duhduh A., Jaafar I.H., Coulter J.P., Lehigh University, US

A novel additive manufacturing technique, which we have coined as the “4D Rheoprinter”, has been developed. This technique enables 3D printing of polymers with tunable material properties for optimized performance in wide range of applications. [...]

Numerical and Experimental Investigation in Replicating a Micro-Featured Surface with the Injection Molding Process

Rajhi A., Jaafar I.H., Coulter J.P., Lehigh University, US

This paper describes current efforts to numerically and experimentally investigate micro and nanoscale features replication using the injection molding process. A silicon (Si) insert with micro–features is fabricated via photolithography followed by deep reactive ion [...]