輥壓高分子薄膜的膜厚均勻性之探討

Abstract

輥壓成型加工是高分子加工領域中的一項重要製程，目前已被廣泛的應用在平板、薄膜等生活中常見用品的製造。近年來，由輥壓製程所壓延成型的高分子薄膜的相關技術已發展成熟，但隨著製品厚度減小、要求的厚度精度提高，輥壓技術面臨更嚴峻的挑戰。 本研究目的是要了解高分子薄膜在輥壓變更參數中薄膜厚度的變化、回復率以及有無氣泡的產生等。並藉由輥筒參數差異所引發的不同現象作為往後輥壓機輥筒的設計改良、操作與維護的重要指標。 本研究自行設計製作了一套高分子材料輥壓設備來進行薄膜輥壓實驗，探討高分子薄膜於輥壓製程中影響厚度均勻性的原因，包括利用輥壓機輥筒的操作參數，如輥筒的冷卻溫度、輥筒轉速、輥筒間的間距等以得到具有良好表面品質和厚度均勻的高分子薄膜。 研究結果顯示，在相同的輥筒間距以及相同的輥筒表面溫度下，薄膜試片的輥出速度越慢，則試片在前後兩端各自的厚度差異上，改善效果較佳也較明顯。而在相同的輥筒間距以及相同薄膜試片的輥出速度下，輥筒的表面溫度越高，輥壓出來的試片整體厚度較為均勻且試片回復率也越低。另外，輥筒間距越小，在試片前後兩端的厚度落差上越能接近一致。本研究的結果可提供未來改進輥筒設備，以及進一步提升高分子輥壓精度的參考。

Roll Forming is an important process in the domain of the polymer processing , simply is widely used in manufacturing processes to increase the life of plates and film . In recent years , various rolling processes for forming polymer film have been developed . However, as with the product thickness decreases , achieving the required accuracy is extremely challenging . This study analyzed polymer film characteristics in terms of roll parameters , film thickness , the response rate of film and bubble generation . Roller parameters were compared between different phenomena as an important indicator of the roller for use in , future designs for improving operation and maintenance . This study also designed new polymer material rolling equipment to achieve uniform thickness in rolling process . Operational parameters analyzed for the roller included the cooling temperature of roller , roller speed and the roll gap between the rollers . The objective was to optimize parameters needed to achieve a good surface quality and a uniform thickness in the polymer film . The experimental results show that , given a similar roll gap and roller surface temperature , the difference in improvements at the ends increases as the roll speed of the film specimen decreases . Given a similar roll gap and roll speed of the film specimen , overall uniformity of roller thickness increases and response rate decreases as the surface temperature of the roller increases . Additionally , as the roll gap decreases , the difference in thickness at the ends of the specimen decreases . The experimental results of this study provide a reference for improving roller devices and polymer roll accuracy .