| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an ultra-thin polymer film. <P>SOLUTION: The method includes following steps. A polymeric composition or a nanocomposite composition is melt blended in an extruder. Next, the molten composition is conveyed through a flat die with a small die lip gap. A melt pump may also be used to provide a constant non-pulsating flow of the molten composition through the die. The molten composition may be passed through a filtration device to remove contaminants that could adversely affect the dielectric performance of the film. Next, the film is stretched by passing the film through take-up rollers at relatively high take-up speeds. Then, the composition is cooled to form a film or sheet. Edges of the film may be trimmed, and the film is wound up on a roll using a tension-controlled winding mechanism. A heating roll may be used to temper/anneal the film, thereby eliminating frozen-in internal stress. <P>COPYRIGHT: (C)2009,JPO&INPIT |
