RE: What is an aluminum drill entry sheet?
hmwadeseo > 02-03-2023, 06:23 AM
Drilling entry material variety
According to the different materials, the market is usually divided into four categories: phenolic paper sheet(including phenolic paper cover and cold sheet), coated resin aluminum sheet (also known as lubrication aluminium sheet), aluminium entry sheet (Ie aluminium entry foil), epoxy glass cloth sheet. Phenolic paper sheet industry less amount, and cold sheet(commonly known as phenolic paper sheet) is mainly used for flexible plate drilling; coated resin aluminum sheet for HDI board, dense BGA, IC board, etc. Micro-hole drilling and flexible plate drilling, made of resin and aluminum foil; aluminum entry sheet or aluminum entry foil, for ordinary and fine circuit board drilling, made of alloy aluminum foil; epoxy glass cloth cover, by the ring Oxygen resin and fiberglass cloth composition, the current market use very little. In addition, there have been a composite aluminum sheet, from wood pulp (core) and aluminum foil composition, fairly rare, has been out of the market.
With the development of PCB technology, PCB drilling holes are getting smaller and smaller, more and more holes, drilling technology requirements are getting higher and higher, entry sheet on the drilling quality of the impact is more important. Some high-end or high-tech requirements of the PCB boards, generally use some of the high-end entry sheet. PCB in the market with the entry sheet of the product structure, with the development of PCB technology, PCB product structure continues to upgrade, and PCB drilling technology upgrade. The selection of drilling materials are in the high block plate, such as lubricating aluminum sheet, cold sheet, phenolic paper pad, melamine wood plate. In particular, high-grade LE sheet, PCB drilling special entry material, HDI (including IC carrier board) with cover, flexible PCB drilling with cold plate, etc. become the market faster varieties.