Introduction of LED light strip production process

At present, LED light bar manufacturing concentrated in the Pearl River Delta, especially Shenzhen, Dongguan, Zhongshan and Guangzhou, about 100 production companies. To private enterprises. Not enough for the domestic market consumption, market acceptance is not high. Most of its products for export, taking into account the domestic market.

By the relevant national policy to promote, stimulate domestic demand and other factors, can be expected LED light bar market, there are three to five years of rapid development. However, many enterprises immature technology, design products into errors, blindly playing the price war. Lead to all kinds of bad times uneven light bar products. This one is led to the quality and stability of the product itself and many other issues, and second, light industry products and companies shall not favor getting the impression that the long LED lights will go on the market is very negative article. In view of this, I would introduce some more friends to the Light of knowledge, we want to help.

A, LED light chip

LED is a set of industrial chain, which is in the upper reaches of the chip wafer cutting and production, which is currently the LED industry's most technical content of the link. Wafer mainly from Japan, Korea, Germany provided the chip mainland enterprises in Taiwan, the epitaxial wafers mainly from Japan and South Korea, power, light decay is best made in Japan, Taiwan Guang Jia, epitaxial wafer, etc. films from Japan, which provides the chip's reputation in the industry are better. Crystal factory in Japan to provide extension beyond the addition of external, it has to start their own cutting, which are bound to the chip factory in Taiwan and the mainland pressure. Part of the package, mainly in Taiwan and Mainland China, Taiwan enterprises in the package which is a world leader billion light appeared, Bai Hong, East Bay, Lite, a large number of quality companies. Around 2000 with the blue chips and white process one after another, and mobile phone, backlight, lighting and other applications market expansion, the Taiwan packaging companies ushered in the industrial spring.

Second, LED light package

The package to be, from the early-line 3MM, 5MM, 8MM, 10MM, piranhas. Chip 0805,0603,1206 late development, the current 1210 (3528), 5050, etc. TOPLED series. Therefore, LED light strip-line is developed from the common to use 0805 and 0603,1206, and 5050 is now the market's hottest products. It is noteworthy that the brightness of LED lights has a direct correlation with the chip. Currently the chip package has 9MIL, 12MIL, 14MIL other dimensions, in theory, the larger the chip, the higher power and brightness, of course, prices are more expensive, many companies currently on the market by 5050 appearance package, but actually using a brightness small chips lower, would have resulted in low prices, but the quality is not good, this is the customer responsible.

Third, LED light bar package

LED light bar LED flexible light strip was divided and the two LED light bar, the difference is as follows:

1, flexible LED light strip is done by FPC circuit board assembly, the assembly with SMT LED, the thickness of their products is only the thickness of a coin, not the space; general specifications are 30cm long 12 LED, 24 颗 LED and 50cm long 15 LED, 30 颗 LED. There are 60cm, 80cm and so on, different users have different specifications. And can be arbitrarily cut off the light can not affect any extension. FPC soft material can be bent, folded, winding, three-dimensional space can be moved around and stretch without breaking. Irregular areas for small places and space, but also because any bending and winding can be suitable for any combination of advertising in a variety of decorative motifs. Should prompt the FPC itself are a variety of materials, but also points the market more used above is made of copper with a sub-salt, two-panel FPC, of ​​course, many enterprises are also the decline in the blind pursuit of material costs, to take electrolyte made of FPC, electrolyte FPC off easily in the welding process, a direct result of Weld and the phenomenon of dead lights, in addition to whether it is from there Flexibility on the electrolyte conductivity are copper salts can not compete with Asia.

2, LED light bar is made with the PCB board assembly circuit board hardware, LED useful for the assembly of SMD LED, LED-line is also useful for assembly, depending on the different needs of different components. Light bar has the advantage of easier fixation, processing and installation are relatively easy; disadvantage is not free to bend, not suitable for irregularities. SMD LED light bar have used 12 LED, 30 颗 LED, 36 颗 LED, 54 颗 LED such a good variety of specifications; with line LED's are 18, 24, 36, 48, etc. of different specifications, There is also a positive side, the side known as the Great Wall Light shining.

Fourth, the difference between light bar glue

The use of the waterproof light materials, more above the current market is the use of epoxy glue AB 560 series. But the use of this glue strip package, generally showing a bubble are more easily broken, do not heat and cold weather, long-term use easy to turn yellow, easy to tear and other defects. Therefore, the most experienced customer complaints is also the issue of such glue. I am the Secretary ingredient is used in polyurethane (PU crystal) of the glue. Polyurethane glue is good expensive, but good transparency fold repeated 500 times is not broken, tear, not a permanent outdoor UV-yellow, high gloss surface of product made from excellent low temperature resistance, water resistance, ozone resistance, acid and alkali resistance, alcohol, arc resistance, UV resistance, impact resistance and other properties of thermal cycles, high-performance fully meet the requirements of indoor and outdoor use.


V, LED lights with production equipment selection

Are also different manufacturers of production equipment, equipment of good quality and service companies recommend a good reputation: Rio Tinto for the LED soft lights with the main SMT process, the process for the paste mixing (LT-180A), solder paste printing (LT-SP600) , light board so large usually 510X250MM Rio Tinto added to a large printing press, through the connecting device (LT-100LC) into the placement machine (SM421S) to mount, stickers, ready to light the PCB through (LT-100LV) then Taiwan split into reflow (small and medium capacity Recommended: S6, large capacity Recommended: M6 Series reflow) to weld the PCB can be tested after the separation, connection, testing, aging, plastic closures, aging, packaging and finished products!


Hard line strip process: through artificial plug, through the DW300 wave welding, welding wire, aging, packaging,




More information: Flexible LED lights, that is, with the production process FPC lights are as follows:

1, the printing paste (LT-SP600). Back to first paste after mixing temperature (LT-180A can mix use), and then put a small amount in the press (LT-SP600) steel line, when the amount of solder paste to move forward to the scraper blade of 3 / 2 is better . After the first test print on the LED FPC to observe the location of solder paste pad is full, there is no less tin or tin, but also note that there is no short circuit. The relations are critical, not strict will cause behind the poor quality.

2, the patch (SM421S). FPC printed on the fixture (jig can be set Rio Tinto), automatically sent to the patch panel location. Placement machine program is a good preparation in advance, as long as there is no problem the first board, then mount the back will be very stable production down. It should be noted that the polarity of LED, SMD resistor should not be confused like, the other is the need to pay attention not to shift the location of placement.

3 Check the link in the middle. Check the LED lights to bring needed attention to the polarity of the LED (with or without reverse), posted with no offset, with or without short-circuit, resistor is correct and so on.

4, reflow soldering (M6/S6). It should be noted that the return temperature must be controlled well, not too low melting solder paste, there will be cold welding; too high, easy blistering FPC. There is preheating temperature should be appropriate, too low volatile flux incomplete residue after reflow, affecting the appearance; too high will cause premature evaporated flux, resulting in reflux Weld phenomenon, while tin may have beads.

5, the finished product inspection. Need to check the product's appearance here, to see whether bad welding, solder balling, short circuit and so on. Then there electrical inspection, electrical performance test products is intact, the parameters are correct.

6, packaging. LED lights with the packaging is generally 5 meters per roll, using moisture-proof anti-static bags for packaging. Packaging accessories from time to time annex should also pay attention to packing in, so that lack of attachment to the customer site can not be used.