Printed Ckt Board
Types of PCB
Single Side (II)
Double Side (III)
Single Side ( 1 layer ) :- The insulating substrate contains ckt pattern on
only one side. Which is called as solder side. The other side is called component side.
Double Side (2 layer) :- Double side means the ckt pattern is present on
the either side of the insulating material ckt pattern both on component side & solder side.
Flexible boards are similar to rigid boards except
the board are made from a flexible substrate material. The base materials are very thin and the common thickness is 0.1mm.
Multi layer Board (MLB, 4L,6L,8L,12L,16L ) :
:The ckt density is high compare to D/S for inner layer
made of special laminate is used for bonding purpose ( Prepreg). The inner layer is etched “CU” and outer layer is Non- etched ckt. After lamination or pressing the boards are drilled and plated like PTH D/S.
Process Flow chart for Single Side P.C.B.
Film master preparation
Roller Tinning or HAL
Process Flow Chart of Double Side P.C.B.
Film Master Preparation
PTH or Electroplating
Pattern Plating or Electro Plating
Dry film Stripping
* Sheet Cutting :-
Measure the size of PCB from film or
* Board Area
* Laminates or Copper Sheet :1. Glass Epoxy 2. Paper fenolic 3.Teflon 4. Ceramick (CEM)
* Glass Epoxy :-
Base material is reinforced with glass fiber or paper fiber as filler and epoxy resin and the cu foil is pressured over it to get cu clad laminates.
* Paper Phenolic :-
Phenolic laminates are reinforced with paper fillers and the cu foil is pressed to the base material.
Thickness :- Fr-2, C-8000, 1.6- 35/0------ S/S, 0.8
* Teflon Laminates :-
Teflon is reinforced with glass fiber to get
a laminates of low dielectric constant and it is used in Radio frequency.
* SHEARING MACHINE :- Used for laminate cutting for PCB
Final Cutting i.e. cutting in finish size.
* Shearing Blades
* Motor drive Shearing.
:-Two Blades :- (I) Fixed Blades
(ii) Movable Blades.
1 to 1.50
* Punching :-Making Big hole, slot of different shape Die &Punch.
* Blanking :- Clean Cutting operation is done with a punching tool. * Routing :- Final Cutting by CNC machine or Pin router
* Drilling :- (I)
CNC Drilling ( Computer numeric Control)
* Manual Drilling :- * Used H.S.S. Drill Bit
* Speed of M/C is 6,000
* Stack Drilling
* Jig Drilling.
CNC Programming & Drilling
Do path making
Focus the Hole with help of camera and monitor.
For time saving and maintained the accuracy.
After programming Drill one Panel for checking the
Checked Missing Hole, Extra Hole,Shifting, Inter changed Hole, Drill Dia ( Drill dia checked by Hole Gauge. )
* Drill Bit :- Tungsten Carbide drill bit used in CNC machine. Shank dia
* In double side PCB drill dia is always 0.1mm extra from finish size.
*. Ink Stripping/ Dry film :To remove the ink by using Naoh or Koh solution. Ink remove and the cu appears on track and pads only.
#. To cover the panel with insulating ink. # To avoid the short ckt. #. To protecte the cu for...
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