Copper Foil Manufacturing

요약:

With high appeal in a wide range of industrial products, copper is viewed as a very versatile material.
Copper foils are produced by very specific manufacturing processes within the foil mill which includes both hot and cold rolling.

Along with aluminum, copper is widely applied in industrial products as a highly versatile material among non-ferrous metal materials. Particularly in recent years, the demand for copper foil has been surging for electronic products including mobile phones, digital cameras, and IT devices.

Foil fabrication

Thin copper foils are either produced by electrodeposition or rolling. For electrodeposition high grade copper has to be dissolved in an acid to produce a copper electrolyte. This electrolyte solution is pumped into partially immersed, rotating drums which are electrically charged. On these drums a thin film of copper is electrodeposited. This process is also known as plating.

In an electrodeposited copper manufacturing process, the copper foil is deposited on a titanium rotating drum from a copper solution where it is connected to a DC voltage source. The cathode is attached to the drum and the anode is submerged in the copper electrolyte solution. When an electric field is applied, copper is deposited on the drum as it rotates at a very slow pace. The copper surface on the drum side is smooth while the opposite side is rough. The slower the drum speed, the thicker the copper gets and vice versa. The copper is attracted and accumulated on the cathode surface of the titanium drum. The matte and drum side of the copper foil go through different treatment cycles so that the copper could be suitable for PCB fabrication. The treatments enhance adhesion between the copper and dielectric interlayer during copper clad lamination process. Another advantage of the treatments is to act as anti-tarnish agents by slowing down oxidation of copper.



Figure 1: Electrodeposited Copper Manufacturing Process

Figure 2 illustrates manufacturing processes of rolled copper products. Rolling equipment is roughly divided into three kinds; namely, hot rolling mills, cold rolling mills, and foil mills.

Coils of thin foils are formed and undergo subsequent chemical and mechanical treatment until they are formed into their final shape. A schematic overview of the rolling process of copper foils is given in Figure 2. A block of casted copper (approximate dimensions: 5mx1mx130mm) is heated up to 750°C. Then, it is hot rolled reversibly in several steps down to 1/10 of its original thickness. Before the first cold rolling the scales which originate from the heat treating are taken away by milling. In the cold rolling process the thickness is reduced to about 4 mm and the sheets are formed to coils. The process is controlled in such a way that the material only gets longer and does not change its width. As the sheets cannot be formed any further in this state (the material has work hardened extensively) they undergo a heat treatment and are heated to about 550°C.



Figure 2: Rolling of copper foils



Figure 3: Copper foil products

기술 자료 검색

검색할 어구를 입력하십시오:

검색 범위

본문
키워드

머릿글
요약

Total Materia는 다양한 나라와 규격에 따른 수천개의 구리 재질에 대한 정보를 포함하고 있습니다.

재질의 화학적 조성, 기계적 특성, 물리적 특성, 고급 물성 데이터 등의 전체적인 특성 정보들을 어디서든 검토하실 수 있습니다.

고급 검색을 이용하여, 검색 조건의 재질 리스트에서 '구리'를 선택합니다. 검색 범위 좀 더 줄이기를 원하신다면 국가/규격과 같은 다른 조건을 지정할 수 있습니다.

검색 버튼을 클릭합니다.


선택된 정보에 부합하는 일련의 재질이 검색됩니다.


결과 리스트에서 재질을 선택하시면, 일련의 규격 사양 소그룹이 나타납니다.

여기에서 선택한 재질의 특정 특성 데이터를 검토하실 수도 있고, 강력한 상호 참조 표를 이용하여 유사 재질이나 등가 재질을 검토하는 것 또한 가능합니다.


자세한 특성 데이터를 보시려면 특성 데이터 링크를 클릭하세요.

Total Materia 데이터베이스를 사용해 보실 수 있는 기회가 있습니다. 저희는 Total Materia 무료 체험을 통해 150,000명 이상의 사용자가 이용하고 있는 커뮤니티로 귀하를 초대합니다.