压延法制备PTFE/TiO2片材的厚度均匀性优化

Optimization of Thickness Uniformity of PTFE/TiO2 Sheets Prepared by Calendering Method

采用统计过程控制(SPC)方法对压延过程进行管控,寻找控制点,开展DOE试验。确定最优压延工艺:压延方向为旋转法,辊间隙调节方法为分段微调,循环2次。对小批量片材压延的过程能力进行分析,过程能力指数为1.13,说明改善后的压延工艺稳定可靠。以最优的压延工艺制备聚四氟乙烯/二氧化钛(PTFE/TiO2)复合片材并制得介质基板,微观形貌显示TiO2陶瓷粉在基体中均匀分散,10 GHz下介电常数为9.97 F/m,介质损耗为0.0021,在400 mm×400 mm内测试100点厚度为(0.715±0.020)mm,厚度均匀性得到了优化。

SPC method was adopted to control the calendering process,find control points,conduct DOE experiment.The optimal calendering process is determined that the rolling direction is the rotation method,and the roll gap adjustment method is segmented fine adjustment and the number of cycles is 2.The process capability of small batch sheet calendering process was analyzed,and the process capability index is 1.13,indicating that the improved rolling process is stable and reliable.With the optimal calendering process of the preparation of polytetrafluoroethylene/titanium dioxide(PTFE/TiO2)composite,the dielectric substrate sheet was prepared.The micro-structure shows that TiO2 ceramic powders evenly disperse in the matrix.The dielectric constant is 9.97 F/m and the dielectric loss is 0.0021 under 10 GHz.The thickness of 100 points in 400 mm×400 mm is(0.715±0.020)mm,and the thickness uniformity is optimized.