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12-08-2020, 08:34 AM
Aluminum PCB sheet is made up of metal substrate, insulating dielectric layer and circuit copper layer. The metal substrate is usually aluminum or aluminum alloy sheet; the insulating medium layer is usually modified epoxy resin, polyphenylene oxide (PPO), polyphthalimide (PI), etc.; and the circuit layer of the aluminum substrate is a copper layer.Aluminum drilling sheet is widely used as the base plate of PCB board. Compared with other conventional circuit boards, aluminum drilling entry sheet features great heat dissipation, electromagnetic shielding, thermal expansion, and dimensional stability.Heat DissipationConventional PCB circuit board substrates such as FR4, CEN3, etc. are thermally poor conductors, and the heat cannot be dissipated. If the internal heating of various electronic devices cannot be ruled out, it will result in high-speed failure of electronic components. Aluminum PCB sheet can effectively solve this problem. Therefore, the fans in the equipment are removed and the size of the equipment will be greatly reduced.Thermal ExpansionThermal expansion and contraction are the common nature of materials, and different materials have different coefficients of thermal expansion (CTE). Since PCB is a composite board, it faces to the crack caused by the different CTE if the heat can not be eliminated in time.Aluminum drilling entry sheet can effectively solve the problem of heat dissipation, thereby alleviating the problem of thermal expansion and contraction of different substances on the circuit board, and improving the durability and reliability of the entire machine and electronic equipment.Dimensional StabilityThe size of aluminum PCB entry sheets changes with temperature is much more stable than that of insulating material. When the aluminum sheet is heated from 30℃ to 140-150℃, the dimensional change is 2.5% to 3.0%.In addition, with less area used, aluminum drilling entry sheet also will save you a lot of production cost and labor. Haomei Aluminum has rich specifications of aluminum sheet for PCB drilling, contact us for today price.