Normal Thickness for 2Layers Flex Circuit (Adhesive)

Different from rigid FR4 PCB, there’re three basic layers for flexible circuits, and various thickness of each maybe used, so people new to that area will be confused to choose a suitable thickness.

Here are four normal thickness for 2 layers (Double sided) flex circuit, and we hope it’ll be useful for the green hand:-)

2L FPC Thickness

2L FPC Thickness

2L FPC Thickness

2L FPC Thickness

As you can see, there’re adhesive in base for each four basic thickness of 2L (double sided) flex circuits, if you need more thin, then you can use adhesiveless material, and final thickness will be thinner even you use the same copper and Polyimide thickness. Please see next article (to be continued…)

Solderability Test Experiment

As is well known, solderability is very important for the printed circuit boards, we must do solderability test of each batch PCB we made. In this way we can inspect the weldability of the PCB before we go ahead the assembly process, much helpful for SMT.

Today we are going to discuss the solderability test experiment. In order to explain it more clear, we now do a simple solderability test and show you all the steps.

1. Take a small solder pot, plug in the power, turn on the switch and heat the solder pot to a certain high temperature(about 8 minutes).

2. Put a tin bar to the solder pot, then you can see the tin bar is begin to melting, slowly into liquid tin, then more and more.
3. After few minutes, there will be enough melting liquid tin in the solder pot to do this test.
4.Use a tweezers to pick up a PCB circuit, first clean the PCB with rubbing alcohol. Because the unclear surface or the oxidation of the PCB will affect the test result.
5. This is the key step of this test, put the PCB into the solder pot, depth about 2 mm,time 4-5 seconds is ok. Then you can see the tin will go into the hole of the PCB.
6. Take out the PCB from the solder pot and put it into the cold water. After few seconds, you can see the experimental effect.

This solderability test is very simple and easy. We can see the results very soon. Our Best Technology did solderability of every batch PCB we made, and we also supply our customers with the solderability test report and the test samples.

Happy National Days

With the weather is getting cold , now we really greeted the Autumn, a season of harvest and happy. In this enjoyable autumn., we also willl usher in the most important festival in China- National Day.

The National Day of the China is celebrated every year on October 1. It is a public holiday in China. Usually people will have a 7 days holiday to celebrate the national day, called “Golden Week”.

National Days are festivals which can stand for independent countries. In the world, countries establish their Notional days on the basis of different ways. Therefore, the names and celebrations of National days in different countries are various. In China, The most significative activity in National Day is The Big Parade in Beijing, Parade Is a ceremony to review the armed forces.

This day is a day of national celebration. Most people will go travel on this holiday, especially to visit the “Red” tourist sites. People also can enjoy kinds of evening party.

On this national day of prayer and remembrance, we ask almighty God to watch over our nation, and grant us patience and happyness!

Our Best Technology will have a 4 days holiday from tomorrow (Oct 1) to Oct 4 to celebrate the National Day, and reopen on Oct 5. Hope everyone can enjoy this holiday and have a good rest.

Happy National Day! Best Wishes To Our Great Motherland May our country become prosperous and strong!

Top Flex Circuit Turnout Companies in 2010

According to IPC data, the flex circuits is still in a big growth process in 2010, and 2011 can see a big increasing of flex circuit whole circuit board industry. Here’re the top sales  in 2010 on the Earth.

Name        (Chinese)           Area        Sales Turnout (million us dollars)

NIPPON MEKTRON     (旗胜)    Japan           2,220

M-FLEX         (维讯)                         USA               878

Fujikura    (腾仓)                         Japan              799

Sumitomo Electrics(住友电工)  Japan         661

NITTO DENKO (日东电工)       Japan               573

FAT(Foxconn)   (鸿胜科技)   Taiwan, China   388

INTERFLEX                              South  Korea         356

SONY Chemical   (索尼化学)  Japan                  334

CAREER               (嘉联益)      Taiwan, China      314

SI Flex                   (世一)        South Korea         301

Sumitomo Bakelite               Japan                      228

KINWONG            (景旺)       HongKong, China    152

ICHIA                 (毅嘉)        Taiwan, China            146

FLEXIUM           (台郡)        Taiwan, China          141

MFS                                       Singapore                  137

FLEXCOM                            South Korea                131

PARLEX     (伯乐电路)  HongKong, China      108

BHflex                                South Korea                 100

Daeduck GDS                    South Korea                68

NEWFLEX                         South Korea                 59

TOPSUN  (元盛)               China Mainland           37

NETRON (奈电)                China Mainland          32

AKM         (安捷利)            HongKong, China      27

We can see Japan still is the number one in this area, the sales turnout of them is  58.79% among these top 20 companies. Only two companies in Mainland China, but we think this will be changed soon, as more and more flex circuits were made in China now.

Happy Mid-autumn Day!

Time flies! Now we ushered in the 2011 Mid-Autumn festival.

Mid-autumn Day is one of the import traditional Chinese festivals, falls on the fifteenth day of the eighth lunar month. On that night the moon is brighter and fuller than any other night. In China, Mid-autumn Day is a time for family reunions.

In ancient China, poets considered the moon as a symbol of brightness, purity, and goodness. They wrote many beautiful poems about the moon. The most popular one was a story about a lady on the moon. She flew to the moon and lived in the Moon Palace.

On Mid-autumn Day, almost everyone gets together with his or her family, eating mooncakes, chatting and watching the moon. Mooncake, whose round shape symbolizes both the fullness of the moon and family togetherness. There are many kinds of mooncakes. They are small round cakes with meat, nuts or something sweet inside . eating mooncakes has been our custom.

The Moon Festivals is one of three major Chinese holidays, along with the Spring and Dragon Boat Festival .On that day, families get together,so we call this day getting together. This is Mid-autumn Day. I love it very much.

Our Best Technology we will have a three day holiday(from Sep 10 to Sep 12) to celebrate the Mid-autumn Day and will reopen on Sep 13. Best Technology wish you all have a happy Mid-Autumn festival! Enjoy the beautiful life together with your family forever.

Tomb-sweeping Day

Tomb Sweeping Day is one of the few traditional Chinese holidays that follows the solar calendar– typically falling on April 4, 5, or 6. Its Chinese name is “Qing Ming” literally means “Clear Brightness,” hinting at its importance as a celebration of Spring. Similar to the spring festivals of other cultures, Tomb Sweeping Day celebrates the rebirth of nature, while marking the beginning of the planting season and other outdoor activities.

The Tomb Sweeping Day in Ancient Times
In ancient times, people celebrated Qing Ming Jie with dancing, singing, picnics, and kite flying. Colored boiled eggs would be broken to symbolize the opening of life. In the capital, the Emperor would plant trees on the palace grounds to celebrate the renewing nature of spring. In the villages, young men and women would court each other.

The Tomb Sweeping Day as Celebrated Today With the passing of time, this celebration became a day to honor the past ancestors. Following folk religion, the Chinese people believed that the spirits of deceased ancestors looked after their family, sacrifices of food and “paper money” could keep them happy, then they would bless the family prosper through good harvests and have more children.
Today, Chinese visit their family graves to tend to any underbrush that has grown, remove the weeds, swept away the dirt, and set out offerings of foods and burning “paper money”.

Up to now, the custom of obeisance ancestry and grieve over those already died relatives on Tomb Sweeping Day are still very widely accepted.

Out Best Technology will have our Tomb Sweeping day holiday from today till Apr 5. And back on Apr 6. Hope everybody have a nice weekend and enjoy life better.

Solderability Test

Solderability testing has become more common in the industry particularly to assess components and printed board surface finishes during the transition to lead-free manufacture. The wetting balance is the standard method of test and provides the repeatability that other methods do not.

Test Principle: Put the samples into tin bath, detect the solderability according to the hole wetting degree.
Ttest Purpose: Test the solderability of the PCB samples
Test Instrument: Thermostatic tin stove

Procedure:
1. Setting the tin slot temperature at 245℃, turn on the power.
2.Waiting for the Test Procedure up to 245℃+/-5℃, paint the samples with rosin. Use clamps nip it , just do as wave-soldering,let samples contact with the tin slot surface. Depth is about 2mm, time is nearly 4 seconds.
3. Tin material changing times: once / two weeks
4.Comments: The plated holes permit only 10% with half infiltrating, nonwettable and air blow is not allowed.


Figure 1. PCB samples before testing with the wetting balance



Figure 2. PCB samples after testing with the wetting balance.

As assembly Electronic components to printed circuit board always need high quality Interchange connection technology, doing the solderability test has great help to the high quality and zero defects welding technology. Our Best Technology did Solderability Test for every batch PCB, but due to some objective reasons, we didn’t give customers the solderability test samples. If customers need it, can also contact us.

Earthquake in Japan

When news come in, no one can believe it. I think, is it a rumor? But few hours later, we have to accept the fact. 9.0 Earthquake really happened in Japan! It is one of bigger disaster recently happened in the world. Remember last time in China, the earthquake is only 8, but it has caused uncountable lost for us. We really hope this bad condition will be finished very soon.

Express our deep sympathy for Japanese and May God Bless them!

The PCB raw material rise in price

International copper prices surged in the latter part of last year,this directly impact the price of copper foil. Since last September it raised month by month. It is reported that February is still raising 8% to 10%, and don’t eliminate to reset to higher prices again in March.

The substantial price rise of the copper foil directly influences the CCL and PCB industry. In February, both the thick and thin CCL had raised 5%-8%. Fiberglass had risen 20%. The PCB industry have gradually turned the corner also had to rise in price. The PCB industry improved obviously in the first quarter this year since last year’s downturn. The price of fiberglass appears a rose space .

On the side, the RMB appreciate against USD dollar, furthermore, gold and copper price, still keep rising since late last year. Especially CCL have also rised this year, this made PCB manufacturers under much pressure, more than 10% of the products had been raised the prices. Some few manufacturers are still keep communicating with their customers recently.

Happy Chinese Rabbit Year

In the past 2011, we achieve great success, together with customers, friends strong support. We see the economic growing, with the increased demanding for circuit board. We think people will need more circuits in their electronics products. So we have more confidence in 2011! So how about you, my friends?

Everybody is looking forward to back home to have happy time with their family and friends. You can see their feeling from the eyes, the face, and the voice is filled with happy, and a little nervous.

 To have good vacation will have good working in new year. Here are our 2011 Spring Festival Holiday Arrangement:

Jan 29th-Feb 9th: Closed

Feb 10th: Re-open

So everybody, enjoy the holiday!

Happy Chinese Rabbit Year! 🙂