Polymer Engineering and Science articles from July 2005

Polymer Engineering and Science archives from July 2005

Effect of diatomite/polyethylene glycol binary processing aid on the melt fracture and the Rheology of polyethylenes.
July 1, 2005... INTRODUCTION Polyethylenes (PEs) are the most widely used polymer materials in industry, but the processing of linear PEs often shows high viscosity and sharkskin melt fracture, which is characterized by a small-scale and high-frequency...

Comparison of the performance of vulcanized rubbers and elastomer/TPE/iron composites for less lethal ammunition applications.
July 1, 2005... INTRODUCTION Composites are a very important class of materials in polymer science and engineering [1]. Composites have superior properties compared to those of the individual components, providing synergy between the phases. Polymer...

Use of preimpregnated sisal yarn in woven reinforced polypropylene sheets: thermoformability and mechanical properties.
July 1, 2005... INTRODUCTION Cellulosic natural fibers are being incorporated into polymeric matrices to reduce cost and to improve mechanical properties. This trend is being driven mainly by government regulations on waste dumping that promote the use of...

Influence of long-chain branching on the rheological behavior of polyethylene in shear and extensional flow.
July 1, 2005... INTRODUCTION Over the last years, linear low-density polyethylene (LLDPE) has been assuming greater relevance in the polymer industry. Due to its superior tensile and impact strength compared to low-density polyethylene (LDPE), it has...

In-line monitoring and analysis of polymer melting behavior in an intermeshing counter-rotating twin-screw extruder by ultrasound waves.
July 1, 2005... INTRODUCTION The melting process is one of the important steps for controlling processing conditions and product quality in both single- and twin-screw extrusion. The melting process in a single-screw extruder (SSE) was studied by Maddock...

Color mixing in the metering zone of a single screw extruder: numerical simulations and experimental validation.
July 1, 2005... INTRODUCTION Single-screw extruders (SSEs) are widely used in industrial polymer processing. Although nowadays in polymer processing they are mostly used as pumping devices for processes such as injection or blow molding, their mixing...

Effects of geometry and injection-molding parameters on weld-line strength.
July 1, 2005... INTRODUCTION In recent years, plastics have begun to show great commercial potential, especially in manufacturing microstructured parts. Injection molding is the most important process to manufacture plastic parts. While many prototype...

Entropic analysis of color homogeneity.
July 1, 2005... INTRODUCTION Color homogeneity is an important aspect of quality and consumer satisfaction in a variety of sectors. Examples are automotive, textiles, food, and packaging, to mention just the most prominent in the plastics and rubber...