Conductive sheets consisting of copper fibers, UF resin, acrylic resin and surface paper were prepared by hot pressing. The results showed that the electromagnetic shielding effectiveness of conductive sheets increased with rising of filling ratio of the copper fibers . When the filling amount of copper fiber was 2S0 g ? M " , the electromagnetic shielding effectiveness of the conductive sheets which consisted of S mm long copper fibers were able to reach from 27 to 65 dB, the electromagnetic shielding effectiveness of the conductive sheets which consisted of 10 mm long copper fibers could reach from 31 to 67 dB, and the electromagnetic shielding effectiveness of the conductive sheets which consisted of 15-mm long copper fibers could reach from 31 to 67 dB. All the conductive sheets had good electromagnetic shielding performance. Some other results were found that under the same filling ratio, the longer fiber was, the higher electromagnetic shielding effectiveness could be. Compared with the length of fibers and thickness of sheets, the filling ratio of copper fibers showed the most significant influence on the averages of SE.%采用铜纤维、脲醛树脂、丙烯酸树脂以及装饰板表层纸进行热压复合制备具有电磁屏蔽功能的导电膜片.结果表明:导电膜片的电磁屏蔽效能随着纤维填充量的增大而增大,当铜纤维填充量为250 g·m-2时,5,10和15 mm铜纤维填充制备导电膜片的电磁屏蔽效能值分别在27 ～65 dB,31 ～67 dB和32～67 dB之间,膜片都具有较好的屏蔽效果.在相同填充量的条件下,长度越长的铜纤维填充导电膜片电磁屏蔽效能值越大.此外结果还表明:对比铜纤维长度和膜片厚度2个影响因子,铜纤维填充量对导电膜片电磁屏蔽平均值影响最显著.
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