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Specification

Aluminium Drilling Entry Sheet

Alloy	Temper	Specification(mm)
		Thickness	Width	Length
1100	H18	0.14~0.18	1244	1092 1041 940
			1220	1067 1016 914

MECHANICAL PROPERTY

Alloy	Temper	Thickness(mm)	U.T.S(Mpa)	Elongation(%)
1100	H18	0.14-0.18	170-190	>=2

TOLERANCE

Thickness(mm)	Width(mm)	Length(mm)	Squareness (mm)
+/-0.005mm	1	1	<=2

Chemical Composition limits(WT.%)

Alloy	Si	Fe	Cu	Mn	Mg	Cr	Ni	Zn	Ti	Al
1100	0.95		0.05~0.20	0.05	-	-	-	0.10	-	Remains

Advantages

1. AA1100-H18 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.

What is a Printed Circuit Board(PCB)?

A printed circuit board (PCB) serves as a foundation and mechanical support for electronic components. Non-conductive surfaces, printed circuit boards are also referred to as etched wiring boards and printed wiring boards. After it is populated with conductive pathways, signal traces and electronic components, it is referred to either as a printed circuit board assembly (PCBA) or a printed circuit assembly (PCA).

An entry material for use in drilling circuit boards to avoid marring of such boards comprises a wood pulp-glass composite substrate (14) having aluminum foil (15, 16) bonded to the opposite surfaces thereof. This entry material is relatively economical and has a stiffness sufficient to avoid upward bending or "oil canning" when pressure feet spaced from the drill are employed to hold the workpiece during drilling and further has enough strength to withstand high torsional drill forces with drills operating for high rates of material removal. The double layers of foil separated by the low heat conductive substrate material affords a pair of heat sinks which more effectively can carry away heat from the drill.

Aluminium sheet in PCB Drilling Process

The first step in the manufacturing PCB (for two layer) is drilling. The CNC drill machines are enormous. Some of the machinces are setup to drill three panels at once and one of the bigger machines (pictured below) could drill six panels of PCBs simultaneously! A layer of aluminum foil sheet is laid down over the board stock to help absorb and distribute heat from the drilling process.

After drilling, the PCB panels have the aluminium foil sheet covering removed and are ran through a machine to remove burs and smooth out any other abraisions that may have happened during the drilling process. This ensures that surface is relatively uniform for the electroless chemical plating process, the next step. The aluminum foil sheet protects the board.

After being drilled, the boards are cleaned.