Soft Copper foil substrate (FCCL abbreviations: Flexible Copper Clad Laminate), also known as: Flexible Copper Clad, Flexible Copper Clad, Flexible Copper Clad, FCCL is Flexible Printed Circuit board (Flexible Printed Circuit board/FPC) processing base material.

FCCL except possesses the advantages of thin, light and flexible, with polyimide basilemma FCCL, also has excellent heat resistance, excellent electrical performance, thermal performance characteristics. Its low dielectric constant (Dk), makes to the rapid transmission of electrical signals. Good thermal performance, can make the cooling of the components easily. High glass transition temperature (Tg) components may be running at higher temperatures. Because FCCL most of the products, is a continuous roll shape form provided to the user, therefore, USES the FCCL printed circuit board production, continuous production and to realize the automation of FPC in the continuity of FPC components on the surface of the installation.

Soft copper foil substrate (FCCL) was divided into two categories: traditional have then dosage form three layer soft board base material (3 l FCCL) no then with new dosage form soft board base material (2 l FCCL) on the second floor two kinds big. It is composed of flexible insulating base film and metal foil, the copper foil, film, adhesive composite with three different materials called three layers of flexible copper clad laminates type flexible copper clad (hereinafter referred to as "3 l - FCCL"). No adhesive for flexible copper clad called second type flexible copper clad (Jane said "2 l - FCCL"). Because of this 2 kinds of soft copper foil substrate manufacturing method is different, so the materials properties of two kinds of base material is also different. Application, the application of two kinds of FCCL products projects, 3 l - FCCL application on large soft board products, while 2 l FCCL application on high order soft board manufacturing, such as soft hard board, COF package, more expensive, because of the price of 2 l FCCL production also is not enough to support the demand of the high order soft board, so there are many manufacturers at home and abroad into 2 l FCCL operation, but there are still a output speed is too slow and the yield is not high.