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Õâ¶Î»°Ó¦¸ÃÈçºÎ·Ò룿ÇóÖú´óÉñÖ¸µã£¡£¡£¡£¡£¡¸Ð¼¤²»¾¡£¡£¡£¡ In this study we compared the performance of a new MB die technology to that of the conventional slot MB die technology.The new parallel plate MB die is simple in design with a cost only one-tenth of the conventional MB die. Experimental results showed that this new die configuration with in-house modification could be used to fabricate meltblown fibrous media in the range of 3¨C10 mm by modulating the process conditions. However, conventional slot MB die produced fibers that were three to five time smaller than what can be produced using the parallel plate MB die design at similar process conditions. The meltblown media produced with the CS MB die achieved 1.5¨C3 times smaller pore size and showed 1.5-2 times higher filtration efficiency. These results taken together indicate further modification needs to be implemented to the parallel plate MB die to bring it in line with its CS analog. We discussed some design modifications that could potentially enhance the parallel plate MB die performance such as decreasing the internal die resistance to air flow to increase air velocity, increasing the number of air nozzles around the polymer nozzles, recessing the polymer spinnerets above the die face, and having inclined air channels to increase the drag force and fiber attenuation. |
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