With the rapid development of mobile phone,electronics,telecommunications and other industries continue to grow and also prompted the PCB circuit board industry quantity at the same time ,people requirements are more and more high in components of number,weight,color,material,precison and reliability.
However,due to the fierce competition in the market price,the cost of PCB
There is a storage time after PCB complete manufacture.it need be baked if more than storage time,otherwise there easy occur burst board problems when make SMT.The storage time of PCB and the temperature and time of baking PCB are standard in industry.
I. Regulation of PCB control
(1.) PCB unpacking and storage
1.Flex Printed Circuit(FPC) Plating
It may have adhesive or ink pollution on exposed copper conductor surface after FPC coating process when FPC plating pre-processing. There will be oxidation,discoloration due to high temperature process.we must remove the contamination and oxide layer of conductor surface in order to obtain a good adhesion of close
Flexible printed circuit boards are more classification methods.According to FPC layer can be divided into: single-sided,double-sided,multilayer and Rigid-Flex PCB. Flexible printed circuit boards(FPCs) market share continues to rise as electronic products tend to miniaturization and lightness. But Flexible printed circuit boards(FPCs) frequently occur breaking, short circuit,line width incorrect defects in
Many PCB designers think the silkscreen legend is not as important as circuit,so they didn’t care about the legend dimension and place position.As a PCB expert, we should consider these particular details.There are some tips for those new PCB designers.
PCB silkscreen automatical machine
The standard design of PCB Silkscreen:
Oil printing: The
PCB Depth control routing technology is the stepstair or groove shaped by partial routing in printed circuit boards(PCBs) manufaturing.It have great advantages in PCB assembly as the special shape of depth routing.
Use the step stair of PCB edge make card slot is favor for PCB fixed and installation.
It
Multilayer PCB have played the leading role as double side PCB is a far cry from meeting demands as upgrading constantly of electronic products in nowaday. Most PCB users don’t know what is the multilayer PCB lamination, let us learn it today.
Multilayer circuit boards lamination is all inner layer bonding
PCB is printed circuit board,it mechanically supports and electrically connects electronic components using conductive tracks,pads and other features etched from copper sheets laminated onto a non-conductive substrate,achieve electronic components automated assembly,welding,inspection,guaranteed the quality of electronic devices,improved productivity and reduced the cost,it’s favorable for repair.
PCB from single layer to multilayer,flex,keep ourselves
PCB industry is technology-intensive,capital-intensive,labor-intensive industry.A middle scale factory have thousands workers, most of automatic machines need worker pile line operation.This years Chinese government impel corporation upgrade the structure of industry and the new labor contract law implement,lead to PCB factory face labor cost raise sharply and shortage,then impact production plan,products
PCB design and manufacture is critical and don’t allowed any mistake.The article will analyses why occurs rough unshaped welding in PCB assembly.
There have many factors lead to rough unshaped welding,like PCB PTH weldability, welding temperature incorrect,solder components incorrect,etc. It’s unfavourable for PCB components running,so we must avoid rough unshaped welding.
PCB PTH
