中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 21 Special 1 March 2011 |
controlling temperature variation
（1. Division of Nano-Mechanical Systems, Korea Institute of Machinery and Materials, Daejeon 305-343, Korea;
2. National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan 609-735, Korea）
Abstract:Micro prism film used in LCD industry can be manufactured by roll to roll method with copper-plated roll mold. As copper-plated roll mold is getting larger, pitch error is getting severer. The pitch error drops the quality of micro prism film. The main cause of the pitch error was investigated during machining large roll mold whose machined length was 1 200 mm. The temperature of machining system was elevated during machining roll mold, and this elevation induced thermal expansion of the system. The temperature variation around the roll mold also made thermal expansion of the roll mold. The amount of thermal expansion had strong relationship to the amount of pitch error. Therefore, the roll mold was machined after warming-up of machining system and precise temperature controller around copper-plated roll mold was installed, which minimized the temperature variation. Finally, precise micro prism patterns without pitch error were machined on the large roll mold.
Key words: copper-plated roll mold; machining; prism pattern; temperature variation
