Characters on computer keyboards are typically printed using one of the two different processes, namely tampographic printing and laser marking. Tampographic printing is time consuming (app. 3-5 mins.), requires skilled workers and employs difficult-to-handle chemicals. On the o…
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Presently there is no data available on the field performance of such epoxy resins in the harsh environmental conditions of the Gulf region. This present study was made to address this issue by running an experimental program in the laboratory under simulated conditions to those…
As part of a broader research effort to prepare polyolefin blends with controlled rheological and mechanical behavior, LDPE/PP blends were peroxide modified through reactive processing in intensive batch mixers and a continuous twin screw extruder. The overall response of the re…
Slow crack growth (SCG) is a time-dependent brittle-type failure that polyethylene (PE) pipes suffer from when under low stress levels. In order to achieve a required lifetime of minimum 50 years, a deep understanding of material's properties is needed. The general accepted mech…
Mold cooling control for plastic injection molding is an important aspect in achieving part quality and increased production rates for the plastic injection molding process. Complex system dynamics have resulted in simplified control schemes that limit mold cooling control based…
This research focuses on how processing effects the mechanical performance of thermally conductive tubing in the US Army’s Microclimate Cooling System (MCS). The PVC originally used in the MCS was identified as a limiting factor in the thermal conductivity heat transfer of the s…
The work presented here concerns the use of sapphire-based layered composites to increase the level of protection for eyewear applications. We analyze the dynamic behavior of sapphire and constitutive properties of polycarbonate, which are the materials involved in the composite…
Nesta dissertação estudou-se, testou-se e resolveu-se problemas de peças injetadas em polioximetileno (POM). Apesar das excelentes características apresentadas por este material, exige alguns cuidados, necessários do ponto de vista de projeto de peça e variáveis do processo de i…
In the past decade the need for development of specifically engineered structures of polymers has resulted in proliferation of products that are manufactured using various coating and multilayer extrusion technologies. It was well known that this class of flows are susceptible t…
The morphology of raw rubber plays a significant role in the degradation processes of rubber. The results of an experimental study involving a unique technique of surface preparation suggests that there is a hierarchy of morphological levels, i.e. those induced by processing and…
Consumer awareness and stringent environmental legislation has initiated a renewed interest in using plant fibres as reinforcement in thermoplastics. The main objective of this research project is to develop high performance sheet moulded natural fibre thermoplastic composites b…
The constant progression of society that desires more advanced, more efficient, and more appealing products requires constant need for development of new technologies and novel ways to produce new products. In the area of multi-layered polymeric systems, the need is no different…
The topic of this thesis is the monitoring of the colour of extruded polymer by measuring the reflectance spectrum of the polymer melt, which is flowing through the extruder during processing. The “in-line monitoring” work had three main objectives: (i) to utilize a new charge c…
Improved planning and control of operations are recognized today as vital needs in recouping or maintaining a company's strength. Use of computers in this field has now become a necessity. Relational database and SQL are the ultimate choice for managing data like inventory and s…
The vulnerability of unreinforced masonry buildings (URM) to earthquakes is a major concern among the earthquake engineering community. One of the most dangerous failure in URM buildings is that caused by out-of-plane loading. The main objective of this study was to understand t…
The current and forecasted major challenge faced by water utilities is delivering potable water efficiently with minimum loss to end users. Water pipe failure has negative impact not only local communities but also on the nation's economy. The American Water Works Association (A…
The whole year around severe weather environment of the Kingdom adds tremendous factors in stressing cable materials and shortens their lifetime. The Kingdom petrochemical industries are striving to improve the quality of the plastic raw materials. On the other hand, cable indus…
Meltblowing (MB) is a unique one-step process for producing self-bonded fibrous nonwoven membranes directly from polymer resins, with average fiber diameter ranging between 2 and 5 μm. Determining routes for making nano- or submicron-fibers using this process are desirable since…
Electromagnetic shielding is becoming more and more important with the abundance of wireless devices. Therefore a need has arisen for more versatile, flexible and low-cost solutions for shielding. For these requirements, carbon microfiber material has been proposed for electroma…