Viscoelastic materials for plastic encapsulated molding compounds invariably exhibit a time-dependent stress response to an imposed constant strain, which is called stress relaxation. Stress relaxation tests with molding compounds used to encapsulate microcircuits have been performed to measure the time dependent non-linear constitutive relation between stress and strain as a function of temper...

Biologically inert elastomers such as silicone are favorable materials for medical device fabrication, but forming and curing these elastomers using traditional liquid injection molding processes can be an expensive process due to tooling and equipment costs. As a result, it has traditionally been impractical to use liquid injection molding for low-cost, rapid prototyping applications. We have ...

Injection molding is an advantageous technology for the mass production of plastic parts without necessity additional procedures. The applicability this method still partially limited by required properties manufactured parts. Especially in field optics, there a need to produce thick-walled while maintaining their transparency. This paper reports on how various shapes gating systems affected pr...

Injection molding is one of the most important processes for mass production plastic parts. In recent years, many researchers have focused on predicting occurrence and intensity defects in injected molded parts, as well optimization process parameters to avoid such defects. One frequent manufactured parts blush, which usually occurs around gate location. this study, identify effective blush for...

Abstract—The detection of the polymer melt state during manufacture process is regarded as an efficient way to control the molded part quality in advance. Online monitoring rheological property of polymer melt during processing procedure provides an approach to understand the melt state immediately. Rheological property reflects the polymer melt state at different processing parameters and is v...

Rapid heat cycle molding (RHCM) is a special molding process capable of producing molded plastic parts with high surface quality and improved weldline strength and appearance. This study investigated the influence of the weldline on the tensile strength of RHCM and conventional injection molded (CIM) components. The test specimens with and without a weldline were cut from RHCM and CIM parts for...