Category Archives: PCB

Aluminum PCB production process

Posted by on September 23, 2011 No comments

Today we have a look at the aluminum PCB production process. Please see below details.

First, Cut matetial;

Second, drilling holes

Third, the dry / wet developing
1, Dry / wet film developing process: nogplate – film – exposure – developing

Fourth, the acid / alkaline etching
1, Acid / alkaline etching process:  etching – Stripping – dry – check board

Fifth, silkscreen soldermask and characters.

Sixth, V-CUT outline;

Seventh,  testing, OSP;

Final, FQC, FQA, packaging, shipping.

The aluminum PCB production process is almost the same as other rigid pcb. CMD Cirsuits have a very strict qualtiy control system for the aluminum pcb and flexible pcb products, we pride ourselves on our quality and this is our selling point. Please contact us for any inquiry.

PCB design and cost controlling

Posted by on September 2, 2011 No comments

Today let’s have a look at the PCB design and cost controlling, in order to allow the PCB cost the lower the better, there are many design factors must be taken into considerations:

1, The board size. Smaller board, the lower the cost. Part of the PCB size has become the standard, as long as the cost according to standard size as it will naturally decrease.
 
2, The cost of SMT is lower than THT, because the parts on the PCB will be more intensive (also small).

3, If the board is very dense with components , then the trace must be more detailed, we should use the advanced equipments and expensive material. The cost of these questions, much more than the cost of reduce the PCB size.

4, The more layers, the higher the cost, but less PCB layers usually result in an increase in size. The cost of multilayer pcb much more higher than single-sided pcb
 
5, Drilling will take time, so the holes the less the better.

6, Buried holes compare tp through plated holes is expensive. Because the buried holes must be drilled before stitching.

7, The size of the holes on the board in accordance with parts to determine the diameter of the pin. If the board has a different type of pin parts, then because the machine can not use the same drill all the holes drilled, Comparison of the relative time-consuming, so it represents to  increase manufacturing costs.
 
8, Fly test, usually expensive than optical methods. Generally speaking, optical test is sufficient to ensure no errors on the PCB.

To know the PCB manufacturing process is very useful, which allows us to know where we should to control. So we know these can be taken into account when we design PCB, and reducing PCB costs.

Structure and function of double-sided aluminum pcb

Posted by on June 2, 2011 No comments

The structure of double-sided aluminum pcb is generally divided into three layers: first layer of a copper foil; the second layer is the thermal insulation materials; third layer is the aluminum substrate.

The fundtion of these three layers of double-sided aluminum pcb: first layer copper foil is made as circuits(conductive). The second layer is the key to check if it has the ability to play the fast passed the heat generated LED to aluminum substrate, it is necessary to know the resistance of thermal insulation materials. The function of the third layer is the aluminum substrate pass the heat from thermal insulating material to lamps again. It also has a installation function.

Thermal conductivity of aluminum pcb is not only has a relationship with the lamps, the most critical depends on the performances of thermal insulation materials.

PCB Dry film photoresist structure and main components

Posted by on May 5, 2011 No comments

This time let’s talk about the PCB Dry film photoresist structure and main components.

1. PCB Dry film photoresist structure:

Dry film photoresist consist of the polyester film, photoresist film and polyethylene protective film three parts.

Polyester film is the based of Photosensitive layer, the thickness is usual 25um.
 
Polyethylene film is a protective film covered with a photosensitive layer on the top to prevent dirt dry dust and dirt.
General thickness of polyethylene film is also 25um.

Photoresist was the subject of dry filmmany,mostly is the negative light material.

2.The main components of photoresist film  :

1) binder (film-forming resin)

2) Light monomer

3) Photoinitiator

4) Plasticizer

5) tackifier

6) thermal polymerization inhibitor

7) pigment

(8)  Solvent
The solvent must be used to dissolve the above components, usually acetone and alcohol.

If you want to know more about produce procedure the rigid pcb,aluminum pcb, please contact with us anytime.

How to distinguish films?

Posted by on April 15, 2011 No comments

In general, the master film is also known as the black film, mainly used to copy the work film (yellow film), but not necessarily only a yellow film for work, are also black films do work. It mainly to do high-precision HDI board or to a one-time savings in the production of small quantities of circuit boards and flexibe pcb. Yellow films mainly used in ordinary printed circuit boards and mass production.

Positive film for the use of graphical electroplating, developing is the circuits, leaving the role of anti-corrosion plating, mainly tin and pb plating. Negatives film used for direct etching, leaving the role of circuits. When distinguish the films, the smooth side is black film, in contrast, is yellow film. And generally use scratching pen to scratch the film can be seen smooth side.

Please Note: There are both glossy and matte side of yellow film, and the second is easy to find easy-to-oil surface indentation when using. On film circuits (copper), the transmitting is negative film, opaque positive film.

CMD Circuits is specializing in manufacturing the printed circuit boards, flexible pcb and aluminum pcb, please contact us if any inquiries.

Aluminum pcb applications

Posted by on April 8, 2011 No comments

Aluminum PCB is one of metal-based pcb,including copper foil,thermal insulating layer and metal substrate three parts,and now the aluminum pcb is widely used in the many applications.

1. Audio devices: input,output amplifiers,balanced amplifiers,audio amplifiers,preamplifiers,power amplifiers and so on.
2. Power Supply: Switching Regulator,DC / AC converter,SW regulator and so on.
3. Telecommunications electronic equipments: high-frequency electric amplifiers,transmitter circuit board.
4. Office automation equipments: motor drive,and so on.
5. Automotive: Electronic Ignition,power controller.
6. Computer: CPU board,power controller,floppy disk drive devices.
7. Power modules: converter,power rectifier bridges.
8, lamp lighting: As an advocate to promote energy-saving lamps and colorful energy-saving LED lights are very popular by the market,while the aluminum pcb used in LED lights have begun a large-scale applications.
CMD Circuits have provided the high quality and competitve cost aluminum pcb,aluminum base pcb and other metal base pcb. Please contact us if you have any inquires.

PCB drilling quality problems analysis and solutions

Posted by on March 4, 2011 No comments

In the PCB drilling process may have the following quality problems:
1, partial hole, porous & leak holes;
2, broken drill bits;
3, blocking the hole (hole with debris);
4, no drill through;
5, burr hole, rough, smudge;
6, the surface burrs.

Here is a quick solution of pcb  drilling quality problems. The method is from 1 to last to  find out the problems.

1. Check the settings of drilling parameters are correct, mainly speed and lower speed. Confirmed whether it is setting or procedural issue.

2. If drilling parameters are right, put printed circuit boards on two machines(Note: to be the same machine model),and using the same or different settings of drilling to confirm the problem is the machine problems or procedural issues. As the probability is too less of the two machine have the same problems, then you can know the problem is the The equipment or procedural problems.

3. If the problems still have, replace of the raw materials and test materials.

4. If the problem still have, replace of the drill bit to test, generally the brand-name manufacturers drilling bits with less problems.

CMD Circuits have the strict quality control systems to ensure the quality of our producting, including rigid pcb, flexible pcb, aluminum pcb and all items. Please contact with us if you need any further information.

The outline of printed circuit board processing techniques

Posted by on February 17, 2011 No comments

The people who engaged in printed circuit board processing will be understanding, PCB outline processing is also one of the difficulties of PCB making, most of the PCB is a rectangle shape, but a considerable number of PCB have a special shape.

PCB outline processing methods:

1. Milling outline: the use of CNC milling machines process outline, it should be provied the milling outline data and corresponding positioning holes data, these datas provided by the programmer. As there is not a great distance between the printed circuit boards, generally about 3mm, so generally use 3mm or 2.4mm diameter cutter.

2. Punching outline: the use of punch punching outline, need of the mold and let positioning pin correspond to the positioning hole of the PCB, usually selected 3.0mm hole for positioning the holes.

3. Open “V” groove: the use of “V” groove cutting machine along the PCB design “V” slot cut the boards into several connected parts;

4. Drill outline: the use of drill to drill holes at the edge of the contour.

Normally open “V” groove and drill only for processing aids.

With the development of printed circuit board design, outline processing technology is also developing. Our company also follow up with the development of requirements of PCB technology and production to keep our products with high quality.

FPC&PCB CAM software

Posted by on February 3, 2011 No comments

 FPC&PCB CAM Software is computer-aided manufacturing technology, for short CAM, is controlled by a computer to complete the production of advanced technology. With the emergence of development of computer technology and laser drawing machine, making the PCB computer-aided manufacturing technology into application. CAM technology enables PCB design into a new level,some functions can not be achieved in the past to implement now. CAM systems are generally able to handle Gerber data, rule out the design in a variety of disabilities that make it easier the design to production, greatly
improving the production quality.

FPC&PCB CAM system’s main functions are as follows:

1, the editing features:

1) Add pads, lines, arcs, characters and other elements.

2) modify the pad, the line size.

3) Move the pads, lines, size and so on.

4) Remove all kinds of graphics, and automatically remove no electrical connection of the pad and via holes.

5) Solder drain line automatic processing.

6) Screen Printing cover pad automatic processing.

2, make-up, rotation and mirroring.

3, adding a variety of positioning holes.

4, generate CNC drilling and milling drill data form the data.

5, the calculation of conductor copper area.

6, other related types of data.

CMD Circuits specizing in manufacturing the flexible pcb, rigid pcb and aluminum pcb.

LED aluminum pcb development

Posted by on January 28, 2011 No comments

With LED aluminum pcb products come out, speed the heat elimination application industry. The LED aluminum pcb with high heat elimination, low thermal resistance, long life, voltage resistance, etc., and as accelerated of production technology, equipments improvements, product prices reasonable, then expand the LED aluminum pcb application industry, such as household appliances lights,car lights, street lamps, and large outdoor billboards and so on. Recent development successful of LED aluminum pcb, so much more for indoor lighting and outdoor lighting products, improving the field of LED industry in the future marketing.

The next five years, China will also take LED aluminum PCB as a major work to promote. With the emerging markets development, LED aluminum pcb develop rapidly in recent years. LED aluminum pcb that is widly used, including: high-power LED lights, searchlights, wall lights, buried lights, LED fluorescent lamp and so on.

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