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This paper presented the measurement results of space charge distribution and high field conduction in cross-linked polyethylene (XLPE) plate sample at various electric fields for a broad temperature range from 30 to 90 °C. The temperature effect on charge trapping and transport mechanism is discussed based on estimation of threshold characteristic and apparent mobility. It is shown that the threshold...
Thermoforming is one of the most versatile and economical processes to produce polymer products, and the key drawback is difficult to control the thickness of final products. The temperature distribution after the preheating process affects to the thickness distribution of final products. The cycle time must be decreased in order to improve the competitive power of the products, but the preheating...
A method using thermal analysis has been recommended to substitute the original method what was based on trial and error for manufacturing a high performance, low cost product. At first, a large scale vacuum furnace was modeled according to a real product, and it was simulated using the material properties in a previous study under the condition of having argon ambient gas. Finally, the performance...
Thermoforming is one of the most versatile and economical processes available for polymer products. The cooling process is one of the key processes of thermoforming which effects to quality of final products. In this study, two kinds of 1-d analysis models were developed under the condition of checking the possibility of changing a 2-d to a 1-d problem in a previous study. At first, a model for stability...
The steam generation mechanism is the key technology of the domestic steam cleaner. Not only the weight and price of a steam cleaner but also the performance of a steam generation mechanism must be considered to improve the competitive power of the products. In this study, a new steam generator which using a cartridge heater was recommended for compensating the drawback of the spray boiling steam...
Thermoforming is one of the most versatile and economical processes available for shaping polymer products. To improve the competitive power of the products, the manufacturing fee should be continuously reduced. But, the required heat can not be freely reduced because of the temperature difference between surface and center of the sheets. In this paper, an optimal design using NURBS and RSM was carried...
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