三井金属再扩产，印证HVLP铜箔高景气

Investment Rating - The industry rating is "Outperform the Market" [8] Core Insights - Mitsui Metal plans to expand its high-end HVLP copper foil production capacity from 580 tons to 840 tons per month, reflecting a 45% increase due to unexpected demand from AI servers [2][4] - The expansion includes an increase in monthly production capacity at the Taiwan plant from 420 tons to 520 tons, with further increases planned to reach 720 tons by March and September 2026 [4] - The HVLP-5 copper foil is expected to transition from the development stage to mass production, indicating potential widespread adoption in next-generation CCL and AI servers [5] Summary by Sections Industry Demand - The demand for the sector is expected to grow significantly, with potential catalysts such as price increases and high-end product sample validations [6] Company Performance - Companies to watch include Tongguan Copper Foil, Defu Technology, Longyang Electronics, Jiayuan Technology, Zhongyi Technology, and Nord Shares [6]