Author Archives: Frank

The performance and thickness of common adhesive tape of flexible pcb

Posted by on March 4, 2014 No comments

Today we here to know the performance and thickness of common adhesive tape of flexible pcb, please see below:

1. 3M9077: thickness 0.05mm; afford high temperature, can be posted before soldering;

2. TESA8852: Thickness 0.05mm; afford high temperature, can be posted before soldering;

3. TESA4972: Thickness 0.05mm; canot afford high temperature; can not be posted before the soldering , but with strong adhesive;

4. TESA4982 Thickness 0.1mm; canot afford high temperature; can not be posted before the soldering , but with strong adhesive;

5. TESA68644 Thickness : 0.1mm; afford high temperature; can be posted before soldering;the adhesive is stronger than others ;

6. 3M467: Thickness :canot afford high temperature; can not be posted before the soldering;

(This tape using only under customers’ special requirements )

7. DK1042 ( conductive adhesive ) : Thickness:0.1mm;canot afford high temperature; can not be posted before the soldering;

8. FC2017 ( conductive adhesive ) : Thickness:0.1mm;canot afford high temperature; can not be posted before the soldering;

9. 3M conductive adhesive : Thickness : 0.05mm; high temperature;need hot pressing and tp be posted before the patch ;

10.18UM pure adhesive : Thickness : 0.018mm; high temperature;need hot pressing and tp be posted before the patch ;

11.25UM pure adhesive : Thickness : 0.025mm;high temperature;need hot pressing and tp be posted before the patch.

CMD Circuits have the all kinds of the adhesive tapes, if you have the inquiry of flexible pcb, please contact us anytime.

Flexible PCB Frequently Asked Questions

Posted by on November 27, 2013 No comments

In the life of flexible pcb issues are concerned, besides the both ends of the flexible pcb to rigid pcb or the connector for connection problems, for the flexible pcb is the ultimate serious consequences – broken.

In order to prevent the flexible pcb is broken in use for some time, we should try to exclude flexible pcbin the folding process of the problems encountered. Described below is our common problems and common solutions:

1. FPC and housing has scratches.

(1) allows the plant to do some transparent mold shell, installed over the whole observed after FPC hole in the state of motion to find the location of the interference with the housing flexible pcb, flexible pcb by changing the length to resolve the issue.

(2) one of the oldest methods, that is, not flexible pcbsamples, we can put flexible pcb 2D drawing paper 1:1 print out (hard to try some of the paper), cut out the shape, carefully fitted to the phone, instead of flexible pcb discover and analyze and solve problems. Or do some manufacturers do not allow the alignment, only the rough shape of the flexible pcb samples, loaded to the phone analysis.

(3) on the FPC can be in contact with the aperture where a layer of foam stickers, so that when the case does not directly turn in contact with the flexible pcb, thereby reducing damage to the FPC in order to increase its life. However, this method is a kind of stopgap feeling, it is best to find a cause from the design itself to be truly resolved.

(4) In order to avoid scratching flexible pcb and the housing has, often foreign practice is to install an iron shaft housing, FPC is fixed to the Iron shaft, to avoid opening and closing the clamshell flexible pcb and the housing crash, friction.

(5) Now a lot of rotating clamshell + phone first consideration in the selection of the FPC FPC around the shaft, or simply using coaxial cable coaxial cable instead of FPC, FPC and easy to avoid distortion or breakage problems.

2. FPC in the folding process of abnormal sound.

(1) FPC in the shaft hole length exceeds the diameter (the lid, there is no interference), but open to a certain angle, FPC will be a twisting process, it will run into the hole wall, we abnormal sound can be heard. FPC common solutions to reduce the length to ensure that the folding does not scratch and can work with the inner wall;

(2) FPC itself is multi-layered, and the inner wall of the hole in the lid when it has interference, so when the flip is always abnormal sound can be heard. We can enable manufacturers tied with tape or glue the layers together seemingly layer, but not in the best part about the folding stick together, keep multilayer structure. flexible pcb same length can be reduced.

Above for flexible pcb and housing has scratches and the flexible pcb discussion abnormal sound, there are many times exist simultaneously, the solution also co-exist.

The above analysis only for the analysis of the most common problems and solutions, in future work may encounter more problems and solutions, and then gradually improve the data.

Flexible pcb connections and testing ways

Posted by on June 26, 2013 No comments

Flxible pcb connections have main two kinds: plug and welding ways. Flexible pcb plug that is inserted into the connector inside, then FPC insertion end and Goldfinger designed according to the spec. of connector. Welding that is Flexible pcb can be soldered to the PCB board, may also be welded to the B2B connector.

As for the Flexible pcb testing, some performance tests are done by the manufacturers, but also can meet the requirements of mobile phones, we are not discussed here. We are most concerned about is the life issues. FPC life in addition to considering the structural design of factors, the most important is to consider the FPC materials. In the selection of the copper foil is best to choose a good rolled copper foil.

About the life test, the best way is through the experiment, through a dedicated folding machine experiment, with automatic counting function, you can test out the Flexible pcb in the normal operating range can be folded up to the number of times. Not yet found what software can simulate analysis. As for the test results can reach tens of thousands of times, different mobile phone manufacturers and the market have different standards.

The issue of flexible pcb cut-out areas uneven

Posted by on June 21, 2012 No comments

When you make flexible pcb samples, and it with many cut-out inside, do you have the uneven issue for the cut-out areas?

We analyzed it and have the following reasons:
1, the cut-outs too much, making with a little difficulty;
2, make samples with simple tooling, so more or less will be a bit uneven phenomenon.

The solution to the problem is actually very simple, use laser cutting, or set up hard tooling. As it’s just the flexible pcb samples stage, in order to save costs, we recommend using a laser cutting, the cost is only increased by a little bit.

If you have any doubts of flexible pcb production process, please feel free to contact us.

FPC panel

Posted by on May 22, 2012 No comments

What is the FPC panel? In fact, the shipments of FPC (flexible pcb) are single piece, there is little make-up panel shipments, unlike rigid PCBs are most panel shipment.

FPC (flexible printed circuit board) production and accounting costs to be determined by the panel design. In general, the width of the raw materials of FPC are 250mm, length control in the range of about 300mm for panel.Higher utilization of space, the lower the cost, then the offer is naturally less. So the FPC make-up panel is very important.

But the final price will depend on the FPC drawings requirements, and some with the higher requirements, the price will be higher.

If you have FPC( flexible circuits) to quote, please feel free to contact our sales staff.

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.

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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