In recent years, with the continuous progress and innovation of electronic technology.It also promotes the development of heavy copper PCB, not only for printed PCB substrate precision and layer number of technical requirements, the PCB substrate material is also constantly put forward higher requirements.Below, China circuit board factory introduces “what are the materials of heavy copper PCB”.
General PCB substrate materials can be divided into two categories:
Rigid substrate materials and flexible substrate materials.
An important type of rigid substrate material is copper clad plate.It is made of reinforced Reinforeing Material, impregnated with resin adhesive, dried, cut and laminated to form a blank, then coated with copper foil, and then processed by high temperature and high pressure forming in a hot press with steel plate as a mold.
The prepreg used for multilayer laminates is the semi-finished product of copper-clad laminates in the manufacturing process (mostly made of glass cloth soaked in resin and dried).
There are many classification methods for copper clad foil.Generally, according to the different reinforcing materials of the board, it can be divided into five categories: paper base, glass fiber cloth base, composite base (CEM series), laminated multilayer board base and special material base (ceramics, metal core base, etc.).
If according to the board used by different resin adhesive classification, common paper based CCI.There are: phenolic resin (XPc, XxxPC, FR-1, FR-2, etc.), epoxy resin (FE-3), polyester resin and other types.
Common glass fiber bucky CCL has epoxy resin (FR-4, FR-5), which is the most widely used type of glass fiber bucky at present.
In addition, there are other special resins (including glass fiber cloth, polyamide fiber, non-woven cloth, etc.) : bismaleimide modified triazine resin (BT), polyimide resin (PI), diphenyl ether resin (PPO), maleic anhydride — styrene resin (MS), polycyanate resin, polyolefin resin, etc.
It can be divided into flame retardant type (UL94 – VO, UL94 – V1 class) and non-flame retardant type (UL94 – HB class).
In recent one or two years, with more emphasis on environmental protection, a new type of CCL without bromine was identified in the flame-retardant CCL, which can be called “green flame-retardant CCL”.
With the rapid development of electronic product technology, CCL has higher performance requirements.Therefore, according to the performance classification of CCL, it can be further divided into general performance CCL, low dielectric constant CCL, high heat resistance CCL(the L of general plate is above 150℃), low thermal expansion coefficient CCL(generally used for packaging substrate) and other types.
The above is the introduction of PCB substrate material. PCB printing process and PCB substrate material selection can directly affect the final quality and application of PCB, which is also one of the important factors that major industries such as electronics and electric appliances pay more and more attention to PCB material selection.
Yongmingsheng technology co., LTD. Is a high-tech company integrating circuit board development, design, proofing, production (processing), testing, production and sales.
The main products are:OSP,ENIG,Lead Free HASL,HAL,Hard Gold PCB, reasonable price;
Since the establishment of the company, from the original professional circuit board processing, to expand the production of flexible circuit board, rigid circuit board, etc.We have been making progress, we have been committed to become a quality PCB manufacturer and service provider.