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    SMT production is the process of creating electronic circuits by plating and metal layers. One can do this with various materials such as copper tin lead gold silver and many others. The manufacturing methodology involves SMT Plating Plating is the process of applying a thin layer of metal to an object.

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    The printed circuit board materials are composite providing the supporting base upon which the etching of PCB traces and components occurs. A majority of PCB materials are reinforced epoxy resin substrate glass fiber and epoxy resin substrate bonded with copper foil. When it comes to PCBs copper is the most popular choice of material here.

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    May 01 2015  Fig. 2 shows the production of PCBs in different countries and regions. China which shares nearly half of the total PCB industries market is the fastest growing nation in the PCBs production. Currently waste PCBs account for ∼3 of the total E waste generated globally Dalrymple et al. 2007 .In China alone considering the total E waste that is

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    ii Estimated unit cost of the proposed new product under activity based costing per unit Direct material 4 kg per unit at 5 00 per kg 20 00 Direct labour 0 5 hour per unit at 10 00 per hour 5 00 Direct other expenses 2 00 –––––– Variable cost per unit 27 00 Overheads Drilling cost 2 drilling operations at 0 50 each 1 00

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  • The History of Printed Circuit Boards

    Feb 19 2016  For prototypes or small production runs wire wrap or turret board can be more efficient. Predating the printed circuit invention and similar in spirit was John Sargrove‘s 1936–1947 Electronic Circuit Making Equipment ECME which sprayed metal onto a Bakelite plastic board. The ECME could produce 3 radios per minute.