【摘要】 探讨了聚氟乙烯(PVF)流延膜在制备过程中常见的缺陷及产生原因,并给出了具体的加工工艺参数。结合PVF 薄膜的双向拉伸机理,通过力学及热性能测试表明:膜片的纵向拉伸温度为120～135℃,拉伸比为2.5～3.0时,薄膜不会出现细颈现象,且所需拉伸应力较小;当横向拉伸温度控制在130～150℃,拉伸比为2.5～3.5时,薄膜厚度介于23～28μm之间,且力学性能基本保持各向同性;双向拉伸的薄膜经过170～180℃热定型之后,横、纵向收缩率均小于2%,具有良好的尺寸稳定性。更多还原

【Abstract】 The reasons for some frequent problems and the optimum technological parameters in the pro- duction of PVF casting film were investigated.The stretching mechanism of the bi-axially oriented PVF (BOPVF)film and the mechanical properties were studied.When the longitudinal stretch temperature was 120～135℃ and the stretch ratio was 2.5～3.0.The casting film could be easily stretched without necking.When the transverse stretch temperature was 130～150℃ and the stretch ratio was 2.5～ 3.5,the thickness of BOPVF was between 23 and 28μm.After the heat setting at 170～180℃,the dimensional stability of BOPVF films obviously improved and the shrinkage ratio at both directions was less than 2%.更多还原