Aluminium pre-entry board for CNC drilling printed circuit board is placed on the top of the stack before drilling. Being aluminium it acts as a heat sink and it’s soft structure provides a good stable entry point for the rotating drill bit. Aluminium entry board can reduce ‘drill wander’ significantly. This is of importance especially when machining Via & buried Via holes in modern Multi layer or Flexible pcb’s
Haomei's
Printed Circuit Board (PCB) entry sheets are manufactured with state-of-the-art equipment which matches international standards. Tight thickness tolerance, flatness, dimensional accuracy and grease-free surface and hardness optimal for burr-free drilling required in the manufacture of PCB are ensured.
Continuous upgrades and process improvement enable us to keep pace with the demands of its ever-growing clientele.
Aluminium drill entry sheet is manufactured for use with double-sided and multilayer circuit boards to meet both the performance and cost requirements for general PCB drilling.
Features
• Excellent heat dissipation of aluminium drill entry sheet cools the drill bit to reduce the risk of resin build-up in the flutes.
• Defined surface roughness combined with excellent flatness is designed to benefit drill centring, reduce drill wander and avoid drill breakage.
• Excellent burr reduction due to high surface hardness and material stiffness
• Protects the circuit board against scratches and pressure foot marks
• Thickness options available for different applications
• Solid aluminium drill entry can be totally recycled.
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.