Industry news

2016August

Production flow of LED lamp strip

From: www.szbako.com Data:06/08/2016

LED light bar production process
LED soft light quality depends on the attitude of the manufacturer and the ability to have equipment. To produce a high-quality LED soft lamp must be guaranteed in order to improve the management methods and reliable incoming inspection process, using high-precision position accurately led SMT machines for mount, then through wave soldering, welding of PCB can be tested separation, connecting, testing, aging, sealing glue, aging, packaging and finished products. Each link and step will influence led soft lamp strip performance and stability, the workshop manual welding and packaging of soft lamp strip is not in anti-static workshop by precise LED chip mounter and clean packaging of high quality LED soft lamp strip mentioned in the same breath.

one, LED light chip LED
is a set of industrial chain, which is in the upper reaches of the wafer epitaxial wafer cutting and production, which is currently the LED industry has the most technical content of a link. Epitaxial films is mainly provided by Japan, Korea, Germany, and Taiwan enterprises in the mainland of the wafer outer epitaxial films mainly from Japan and South Korea, the brightness, the light fades the best is made in Japan and Taiwan wide shocks, the Puri epitaxial films from Japan and the wafer in the industry's reputation is also good. At present, Japan, in addition to the outside world to provide epitaxial epitaxial epitaxial, which has begun its own cutting, which will cause pressure on the wafer plant in Taiwan and the mainland. In the part of the package, mainly concentrated in Taiwan and the mainland of China, which Taiwan enterprises in the packaging field in a leading position in the world, billion light, Baihong, East Bay, Chi Mei, etc. a large number of quality enterprises. After 2000 with the advent of the Blu ray chip and white technology, as well as mobile phones, backlight, lighting and other applications to expand the market, Taiwan packaging enterprises ushered in the industry in the spring.

Second, LED lamp package
in the form of packaging, from the initial in-line 3mm, 5mm, 8mm, 10mm, piranha. Late development patch 080506031206, now 1210 (3528), 5050 and other TOPLED series. So the LED lamp strip is developed from the ordinary line type to use 0805 and 6031206. And now the hottest market 5050 series products. It is worth noting that the brightness of the LED lamp is directly related to the chip. The wafer package has 9MIL, 12MIL 14MIL size theoretically speaking wafer more, higher power and brightness, of course, the price is more expensive, at present a lot of companies on the market by 5050 package appearance, but in practice is relatively low brightness small wafer, thus causing low price, but the quality is not good, this is irresponsible to customers. When used to carefully identify the welding process and lamp brightness, the difference with the instrument can be quickly identified.

, LED lamp strip package
LED lamp and points LED flexible lamp strip and LED light strips. The differences are as follows:

1, LED flexible lamp strip is used FPC assembly circuit board, LED SMD assembly, the thickness of the product is only 1mm thickness, does not occupy a space; common specification per 30 metres of lamp, 48 lights, 60 lights, different users have different specifications. And it can cut, also can be extended and is not affected by the light. FPC material soft, can be arbitrary bending, folding, winding, can move in three-dimensional space and flexible and will not break. Suitable for the use of irregular and space, but also because it can be arbitrary bending and winding, suitable for any combination of various patterns in the advertising decoration. Deserves prompt FPC material itself is also divides a lot of kinds, on the market with the formal is made of rolled copper double panels of FPC, of course, a lot of enterprises is also a taste of the pursuit of material cost decreased to take electrolyte made of FPC, FPC of electrolyte in the welding process to peel off, a direct result of the weld and the dead lights phenomenon, in addition to either from the conductive performance and flexibility on the electrolyte is not able to compete with the rolled copper.
2, LED light bar is with PCB assembly circuit board, led useful smd led to assembly, is also useful in line LED assembly, depending on the different needs and the use of different components. The advantage of hard light is relatively easy to fix, processing and installation are more convenient; the disadvantage is not free to bend, do not fit the rules of the place. Hard light strip with SMD LED per meter 30 lights, 48 lights 60 lamps, such as good a variety of specifications; dip led the has 18, 24, 36 teeth, 48 teeth with different specifications, positive and side, side emitting also called great wall lamp.

4, light bar glue difference
in light waterproof material to be used, on the market at present more is using epoxy resin AB glue series 560. However, the use of this glue package light, generally showing a more bubbles, easy to break, not resistant to high temperature and cold weather, long-term use easy to yellow, easy to tear and other defects. Therefore, the largest customer complaints encountered this kind of glue problem. At present, our use of ingredients is polyurethane glue. Polyurethane is a adhesive is expensive, but good transparency repeated fold 500 times does not break, tear resistance, resistance to UV light outdoor permanent yellow, excellent surface gloss made products with excellent low temperature resistance, water resistance, ozone resistance, acid and alkali, alcohol resistant, resistant electric arc, Nai Zi light, resistant impact of thermal cycling and other properties, fully meet the requirements of the users and the use of high performance.

5, LED soft lamp strip production equipment choose
with mainly for SMT process, the process for solder paste mixing LF-180A, solder paste printing (LTCL-SP600), panel lights usually for 510X250MM so to add large printing machine, is sent to a placement machine through the connection device (LF-100LC) SM421S mount, stick the light in the PCB through (LF-100LT) connection platform into reflow (small and medium capacity recommended: S6, large production capacity of recommendation: M6 series reflow welding after the PCB can be tested separation, connecting, testing, aging, sealing glue, aging, packaging and finished products for LED soft light.

in line process of hard light: through artificial plug-in, welding by DW300 wave soldering, welding line into, aging, packaging
LED flexible lamp, also is led soft light production process are as follows:
1, solder paste printing LTCL-SP600. First paste back to temperature of mixing (LF-180A can directly mixing use), and then put a few in the printing machine LTCL- SP600 steel online, to blade forward when solder to blade 3 is good. The first printing test should pay attention to observe FPC led pad locations of the solder paste is full, there is no less tin or tin, but also pay attention to the there is no short circuit. This is very critical, strict checks will result in poor quality behind.
2, patch (SM421S). The printed FPC put on a fixture, automatic feeding plate to the location. The procedure of the placement machine is prepared in advance, as long as the first piece of plate with no problem, then it will be very stable production. Note here is led polarity, SMD resistor resistance don't confuse good, also need to pay attention to is the mount position don't migration.
3, intermediate check links. Need to pay attention to check the LED flexible lamp with LED polarity (reverse), affixed with no offset, short circuit, resistance is correct.
4, reflow soldering (M6/S6). Here need to pay attention to the reflow temperature must be controlled, too low a solder paste will not melt, cold welding; too high FPC blister easily. And preheating temperature is appropriate, too low volatile flux is not complete, after reflow residue, affecting the appearance; too high will cause premature volatilization flux out, the backflow Xuhan phenomenon and there is the possibility of solder ball.
5, finished product inspection. Check the products here need to see whether the appearance of bad welding, solder ball, short circuit and so on. Then is the electrical inspection, test product electrical performance is intact, the parameters are correct.
6, packaging. LED flexible lamp with the packaging is generally 5 meters per roll, the use of anti-static moisture proof packaging bags for packaging.

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