Aluminum Drilling Entry Sheet as a "sacrificial backing board" for metal. You place it under the part you're drilling. It takes the abuse from the drill bit, sacrificing itself to guarantee the actual part you care about comes out with a perfect, clean, and burr-free hole. It's a simple, effective tool that dramatically improves manufacturing quality and reduces secondary deburring operations.
3003 PCB aluminum entry sheet
1100 PCB aluminum entry sheet
1050 PCB aluminum entry sheet
3105 PCB aluminum entry sheet
8011 PCB aluminum entry sheet
1060 PCB aluminum entry sheet
3004 PCB aluminum entry sheet
The entry sheet acts as a sacrificial layer that solves these issues:
Provides Support: It backs up the workpiece, preventing deformation and vibration ("chatter") during drilling.
Guides the Drill: As the drill bit exits the workpiece, it immediately enters the softer, more uniform material of the entry sheet. This guides the drill bit and keeps it centered, preventing it from grabbing and tearing the aluminum workpiece.
Produces a Clean Burr: Instead of forming a large, ragged burr on the workpiece, any tearing occurs inside the entry sheet. The burr is formed on the sacrificial sheet, leaving the exit hole on the actual part much cleaner and more precise.
Protects Equipment: It also protects the drill press table or fixture underneath from being damaged by the drill bit.
| Alloy | Temper | Specification(mm) | ||
| Thickness | Width | Length | ||
| 1100/3003/3105 | H18 H19 | 0.1~0.3 | 1244 | 1092 1041 940 |
| 1220 | 1067 1016 914 | |||
Advantages of Aluminum Drilling Entry Sheet
1. It can protect the circuit board against scratches and pressing marks.
2. It improves the nicety degree of the drilling position. It makes the drilling have guidance so that the drill works without deflection.
3. It significantly lengthens the life of the drill bit. Its specific alloy composition can keep the cleanness and the cooling of the drill bit. Whats more, it is a good conductor of heat so it prevents overheating of the drill bit and it can avoid the oxidation of the surface.
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PHENOLIC ENTRY AND BACKUP BOARD
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XPC Board
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WHITE BACKUP BOARD (UV)
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PCB entry material with hole tooling
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ALUMINIUM CLAD ENTRY FOIL
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LE Sheet
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Coated aluminum entry
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Aluminium Drilling Entry Sheet
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3105 aluminium drilling entry sheet
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1100 aluminium drilling entry sheet
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3003 aluminium drilling entry sheet
The main effect of the PCB entry sheets
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As the auxiliary material for PCB drilling, the cover has five main effects:
1.protection board (protection of copper clad copper plate surface, or copper substrate conductive layer), to prevent the pressure foot pressure plate;
2. fixed drill, Reduce the drill bit when the drift amplitude, offset, so that the drill bit can be accurately positioned; to improve the hole accuracy, to prevent the broken drill;
3. to prevent the hole on the substrate burns;
4. help drill bit heat, reduce the bit temperature; Groove; to prevent greasy dirt; to reduce the wear and drill bit drills.
5.The performance requirements of the drilling entry boards are: soft enough; thickness tolerance is small; flat and not easy to deformation; high temperature; low moisture absorption; surface no impurities, foreign matter, obvious defects and so on.
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.
Aluminium lubrication entry sheet (LE sheet)
Aluminium lubrication entry sheet is the entry sheet for mechanical drilling that consists of the lubricating layer and the aluminum sheet.
Leading clients in the industry: CCI , VENTEC TECH , HOLDERS TECH etc
Advantages of lubrication entry sheet
The lubricants prevent the drill bits from wearing out and lengthen the life of the drill bits. Furthermore, the stack height can be increased and the drilling cost will be decreased with LE SHEET. The lubricant melts and covers the drill bit while drilling. And the smear is prevented because the friction heat generation between the drill bit and the holes wall is prevented with this phenomenon. And also, the lubricants prevent the drill bits from wearing out and lengthen the life of the drill bits. Furthermore, the stack height can be increased and the drilling cost will be decreased with LE sheet. Good quality through holes with less wall roughness and less micro crack between the glass fiber and the resin can be made with LE SHEET, because the debris can be smoothly discharged with the lubricant. In addition, the lubricant of LE sheet is water soluble and easily removed by water rinse.
| Thickness | Thickness Tolerance | Size (inch) | Size Tolerance (mm) | Remarks |
| 0.14 | ±10% | 37"x49" | ±3 | cut for specific size |
| 0.1 | ±10% | 41"x49" | ±3 | |
| 0.18 | ±10% | 43"x49" | ±3 |
Special Features:
- •Extraordinary drilling accuracy
- •Effective heating transfer
- •Reduce the abrasion of drill bit
- •Improve hole quality
- •Increasing production efficiency by lacking more layers pcb
Application Of LE SHEET:
• Use for BGA and high precision drilling
