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On the PCB Component Layout Inspection Rules

Sunday, September 18, 2016 9:49:10 AM Asia/Shanghai

On the PCB Component Layout Inspection Rules

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Posted in PCB Technology By nail nail

Acid Oil Removing Method for PCB Copper Plating

Saturday, September 10, 2016 11:38:36 AM Asia/Shanghai

Acid Oil Removing Method for PCB Copper Plating

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Posted in PCB Technology By nail nail

PCB Prototypes Vital to Electronics Market Growth

Friday, September 9, 2016 11:14:49 AM Asia/Shanghai

Imagine a smart phone that thinks like a human brain. Anyone walking along the street or driving on the road often may not realize how their brain is at work all of the time, noticing all sorts of movements at changes along the route. The brain carries out this task at a rapid speed. So is it possible to invent a smart phone that will do the same? PCB prototyping is hoping to one day bring these fantasies to a reality.

 

The Ultimate Smart phone

However good smart phones and computers can be these days, they are not intelligent enough to differentiate between objects in the same way as a human brain does all of the time. The smart phone doesnt know the difference between a human being and a lamp post. But what if it could?

Maybe the phone could tell you that there are some suspicious-looking strangers casing your neighborhood. It could send a message if it notices that some articles in a shop window are on offer at a better price than yesterday.

 

An Ongoing Process

As electronics manufacturers conduct research into these future products, they have to test their ideas all of the time. For those involved in manufacturing printed circuit boards, PCB prototyping is not something to be conducted just once it must happen throughout the entire manufacturing process.

The electronics manufacturer has to ensure that the product works as claimed and is reliable and safe.

 

Customer Communication

As they develop the smart phone that can tell the difference between a person and a lamp post, electronics manufacturers must communicate with customers to see how the technology works in different environments. At some point, the customer will be looking for a phone that not only distinguishes between humans and street furniture, but between humans, animals and trees.

Customers are demanding ever more innovative smart devices that have an increasing array of components in an ever smaller space. The manufacturer has to use PCB prototyping to detect potential problems before they occur, reduce safety risks and keep a firm control on costs.

All this needs investment. Manufacturers have to develop their own bespoke PCB prototyping facilities for each product. They also must invest in a qualified workforce that has the skills to interpret any subtle signs of potential problems during the test stages.

Such testing facilities will also have to be designed to suit customers who buy sophisticated devices that must operate in extreme or critical environments, such as aerospace engines or offshore technology.

If you have any PCB or PCBA projects, please feel free to contact Joanna via EmailJoanna@raypcb.org

Posted in Industry News By joanna joanna

Global PCB Industry Report, 2015-2020

Tuesday, September 6, 2016 6:29:11 PM Asia/Shanghai

Global PCB Industry Report, 2015-2020

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Posted in Industry News By alan alan

SMT Assembly Market Set for Significant Growth

Wednesday, August 31, 2016 10:14:22 AM Asia/Shanghai

Surface mount assembly is a form of surface mount technology (SMT). It is a method of electronic circuit production where components are placed directly on the surface of a printed circuit board. This technology has replaced the earlier method of wiring components to a circuit board through holes in the board.

As a result, the circuit board is smaller than before as it has fewer or no leads. Instead, it connects with other parts of an electronic device through a series of pins, contacts and solder balls.

The equipment used in surface mount assembly consists of robotic machines that are often called pick and place machines. These work at high speed to place resistors, capacitors and other components on the circuit board. The equipment carries out its work according to specific pre-programmed tasks.

The software required to operate these machines has become one of the fastest-growing segments within the surface mount assembly market.

The reason for this market surge lies in attempts over recent years by manufacturing industries to streamline their operations. Rising costs of skilled labor as well as rising energy costs have meant that the manufacturing sector has had to eliminate those operations that were not deemed to have added value, and has had to redefine and optimize other shop-floor processes.

The increasing automation of shop-floor processes has led to a greater demand for surface mount assembly equipment. This has coincided with a drive for efficiency and miniaturisation in the medical, electronic, defense and aerospace industries that has also increase demand for smaller electronic devices and hence surface mount assembly equipment.

The emphasis on product quality has led to a further demand for surface mount technology inspection equipment. This not only reduced repair and reworking costs, but also maintained quality control throughout the production process.

Continuing technological advancement along with burgeoning demand from emerging and developed economies recovering from the 2007-8 financial crisis and recession have contributed to the ongoing growth. The market in Asia has been boosted by a resurgence of demand from China. The health care and automotive industries in particular are likely to boost this market to a global value of US $11.7 billion worldwide by 2017.

The surface mount technology market has become intensely competitive. The problem for new entrants into this market could be financing high upfront research expenditure.

 

If you have any PCB or PCBA projects, please feel free to contact Joanna via EmailJoanna@raypcb.org

 

Posted in SMT News By joanna joanna

The Impact of Copper Dissolution on PTH Assembly

Friday, August 26, 2016 11:23:06 AM Asia/Shanghai

Plated through-hole - also called thru-hole - assembly, or PTH assembly, provides a method for a connection between printed circuit board (PTH) rack layers.

The principle is to drill or punch holes through the board and then plate, or metallise, them. This is a more expensive method for binding circuit board components than in straightforward surface-mounted technology (SMT), but the binds are mechanically far stronger.

The main advantage of PTH assembly over SMT technology is that, in the latter case, the soldered joints will tend to contract over long periods of time. This is an especially difficult problem in large capacitors and electrical installations such as those used in power generation that may be subject to large mechanical stresses.

PTH assembly faces a number of critical reliability factors. The circuit board material and thickness will determine the power and speed of the drilling machine used to create the holes. If the drilling speed is too great, it could cause rough edges around the holes or a breakdown of the drilling bit.

However, like SMT technology, PTH assembly still has to use solder. Since lead-free tin-copper alloys were introduced into electronic circuitry, copper dissolution has become a major issue in the bonds as well as in the hole plating.

Copper dissolution is a normal phenomenon that occurs on the contact of copper plating with molten tin-rich solder. The copper plating effectively dissolves into the solder. This dissolution is a necessary process for the creation of solder joints.

The dissolution process becomes stronger when there is a greater proportion of tin in the lead-free solder alloy. Copper dissolution is also affected by other variables in the thru-hole assembly process such as the pre-heat temperature of the board and the contact time between the copper plating and the flow rate of the solder fountain. The most susceptible part of the assembly is at the knee of the through hole.

The addition of nickel, silver, antimony, germanium and bismuth to the solder alloy to allow a reduction in the tin content helps to slow the copper dissolution process. However, experts say that while this process may work initially, it will not prevent copper dissolution during any reworking process.

The real solution to this dilemma is a new reworking process for thru-hole assemblies, but this still awaits development.

If you have any PCB or PCBA projects, please feel free to contact Joanna via EmailJoanna@raypcb.org

 

Posted in SMT News By joanna joanna

How to Avoid the EMC Problem on PCB Design

Friday, August 26, 2016 10:04:51 AM Asia/Shanghai

How to Avoid the EMC Problem on PCB Design

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Posted in PCB Technology By nail nail

Automation Cuts Costs of Surface Mount Assembly

Tuesday, August 23, 2016 10:56:46 AM Asia/Shanghai

Growing demand for smaller and cheaper electronic devices has meant that assembly-line managers face a challenge in bringing down costs. One of the major costs has been the manual testing of printed circuit board assemblies.

Manufacturers have adopted a new strategy of bringing down labor costs by replacing the manual testing with a variety of automatic systems. Some of these have been more successful than others.

One of the most popular solutions has been to replace the manual labor with a robotic arm, while another is an automated inline circuit tester for surface mount assembly.

In this first system, the robotic arm loads the printed circuit board assembly on to the circuit tester. Once loaded, a top cover on the fixture closes automatically and starts scanning. The problem here has been that if the board is misplaced on the tester, it can be damaged by the misalignment. So an operator has to be on hand to adjust the placement manually.

The top cover is pneumatic and also uses a vacuum to ensure that the circuit board is in firm contact with the line. This makes for a very heavy system with a long set-up time.

In addition to the obvious extra labor costs this system entails, the operator is also in danger of being injured by any automatic closing of the top cover. The robotic system also took up more space than the original manual system.

There are also potential human-error problems with the automated inline circuit testing system. The circuit board is carried by a conveyor to the inline testing handler, where a scanner reads the board's bar code. If this is accepted, testing proceeds and the board moves on to the next station on the surface mount assembly line.

This system occupies very little space and is light and easy to assemble. Unlike the robotic arm, it does not require constant supervision by an operator. The problems begin if for any reason the inline circuit tester breaks down. This means that operators must remove all the circuit boards scheduled for testing so that the production operations are not disrupted or the testing procedure has to be bypassed altogether.

However, manufacturers conclude that the automated systems do represent considerable cost savings. The bulk of the costs are in the initial capital investment in equipment.

If you have any PCB or PCBA projects, please feel free to contact Joanna via EmailJoanna@raypcb.org

Posted in SMT News By joanna joanna

Flux Corrosion Issues in SMT Assembly

Monday, August 22, 2016 1:49:48 PM Asia/Shanghai

Flux corrosion is one of the most common reasons why a customer may reject an SMT assembly product or why the product does not function at all. The important matter is to understand how flux corrosion occurs and to choose the correct flux products for SMT assembly.

Surface mount technology, or SMT assembly, is a process of securing components to a printed circuit board. Soldering is a method of controlling how one metal dissolves into another to form a firm intermetallic bond. The surface of each metal should be free of contamination in particular oxides of any of the metals used. Flux functions as a cleaning and flowing agent by reacting with the metal oxides to produce a clean, oxide- and oil-free surface for the metals to bond.

There are four main types of flux: inorganic acids, organic acids, rosin and no-clean fluxes. Highly corrosive inorganic fluxes are rarely used these days in electronics assembly. Organic fluxes are weaker than inorganic fluxes but environmentally better and stronger than rosin fluxes. However, they are not as tacky as the rosin fluxes. Tackiness is necessary for a solder paste to prevent any movement of the component during its placement.

Rosin flux is made from pine resin and a mixture of organic acids. It dissolves thin oxide layers on the metal. No-clean fluxes are the cutting-edge soldering technology and leave no residue after soldering that requires cleaning or any tacky residue that may attract dust.

Flux corrosion occurs in two main processes. It can be a chemical reaction, where a metal reacts into another compound, or an electrolytic process, when one metal in the solder corrodes faster than another when in the presence of an electrolyte.

Even the new no-clean fluxes have corrosion concerns. The most common effect is when too much of the flux is applied and residues from it are not volatized adequately during soldering. Remaining acids may attack any exposed metals such as copper in the printed circuit board and cause short circuits on the board. Sometimes, a weak flux may react in an unexpected manner when placed on the board.

Flux selection should be made on the basis of recognised industry standards. Users should not rely on data sheets that may be many years old. Most importantly, all stages of the soldering process during SMT assembly should be controlled.

 

If you have any PCB or PCBA projects, please feel free to contact Joanna via EmailJoanna@raypcb.org

Posted in SMT News By joanna joanna

Switching-power-supply-for-PCB-design-need-attention-points!!!

Monday, August 22, 2016 10:45:42 AM Asia/Shanghai

In any switching power supply design, physical design PCB board is the last link, if the improper design, PCB can radiate excessive electromagnetic interference, resulting in an unstable power supply, carry out the following matters for the various steps required to pay attention to analysis

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Posted in PCB Technology By judy judy
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