What is a combination of soft and hard boards?
The information comes from:the Internet posted on:2023-04-19
What is a combination of soft and hard boards?
As a special interconnection technology, the combination of soft and hard boards provides a new way of connecting electronic components. It can achieve two-dimensional design and production of circuits, and three-dimensional interconnection assembly, thereby reducing the assembly size and weight of electronic products. It has the characteristics of light, thin, short, and small.
The combination of soft and hard boards can replace connectors, reduce the number of connectors, and save costs; Repeated bending for over 100000 times can still maintain electrical performance; It can achieve impedance control of the thinnest insulated carrier board, reduce weight, installation time, and cost; The material has high heat resistance and also has better thermal diffusion ability. Currently, the combination of soft and hard boards has drawbacks such as complex processes, high production costs, and difficulty in modification and repair.
Soft hard combination board
Introduction to Materials of Soft and Hard Combination Board
The processing substrate material of the soft and hard combination board is the same as that of the flexible circuit board, which is flexible copper clad laminate (FCCL). FCCL refers to the copper clad plate formed by bonding one or both sides of flexible insulating materials such as polyimide film or polyester film with copper foil through certain process.
Among them, the flexible copper clad plate composed of three different materials: copper foil, film, and adhesive is called the three-layer flexible copper clad plate (referred to as "3L-FCCL"). Flexible copper clad plates without adhesive are called two-layer flexible copper clad plates (referred to as "2L-FCCL").
The composition of FCCL mainly includes the following three categories of materials:
Insulating base film material: polyimide film (PI film) and polyester film (PET film) are the most widely used at present.
Metal conductor foil: Commonly used include copper foil, aluminum foil, and copper beryllium alloy foil. The vast majority use copper foil, including electrolytic copper foil (ED) and rolled copper foil (RA).
Adhesives: mainly polyester adhesive, acrylic adhesive, epoxy or modified epoxy adhesive, polyimide adhesive, phenolic butyraldehyde adhesive, etc. In 3L-FCCL, adhesives are mainly divided into two schools: acrylic adhesives and epoxy adhesives.
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