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Material and Stack up for Flex PCB

  • 2022-11-03 14:34:48

1,铜箔基材CCL (FPC Copper Clad Laminate)

It is composed of three layers of copper foil + glue + substrate. In addition, there are also non-adhesive substrates, that is, a combination of two layers of copper foil + substrate, which is relatively expensive and suitable for
For products that require more than 10W times of bending life.

1.1 Copper foil
In terms of materials, it is divided into rolled copper (Rolled Anneal Copper Foil) and electrolytic copper (Electrodeposited Copper).
Foil), in terms of characteristics, the mechanical properties of rolled copper are better, and most of the rolled copper is used when flexibility is required. thickness
For 1/30Z.1/20Z. 10Z. 2OZ and other four kinds.

1.2 CCL
In terms of materials, it is divided into PI (Polyamide) Film and PET (Polyester) Film. The price of PI is higher, but its
It has better flame resistance, and the price of PET is low, but it is not heat-resistant. Therefore, if there is a need for welding, most of them use PI material. Generally in thickness
1/2mil, 1mil, 2mil.

1.3 Adhesive
There are generally two types of glue: Acrylic (acrylic glue) and Epoxy (epoxy glue). The most commonly used is Epoxy glue. thickness
0.4 ~ 2mil are available, generally use 18um thick glue.


2, Cover film
The cover film is composed of base material + glue, and its base material is divided into PI and PET. The thickness is from 0.5 to 1.4mi.




3, Stiffener (Reinforcing material )
3.1 Function:In order to weld parts in the local area of the soft board, add reinforcement for installation and compensate for the thickness of the soft board.
3.2 Material:PI/PET/FR4/SUS
3.3 Combination method:
PSA (Pressure Sensitive Adhesive): pressure sensitive type (such as 3M series)
Thermal Set: Thermosetting (bonding strength, solvent resistance, heat resistance, creep resistance)




4, Single Flex PCB, Double Flex PCB, Multi Flex PCB


4.1 Single side


4.2 Double side



4.3 Composite board



4.4 Sculptural


4.5 Multilayer


4.6 Flex Rigid PCB


If any question, please RFQ.




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