The former phone cable, because the phone is relatively simple, ranked by the use of the line are single-layer, with the phone features more complex, multi-row line applications will become increasingly common. For example: the 580,760 Philips, Nokia 3128,6290,6152, and so are the four-story row lines, 639,680 of Philips, Motorola's 1070, K1, LG's MG200, KG220, are five-storey Cable, Samsung E368, E348, Z300, E338, E738, Motorola's V3x (small row), V3c (small row) are 6-row line.
Multi-row line is due to cable lines are too complex or because the cable itself size constraints, have had to be designed into a row of multi-layer structure. From mathematics, multi-cable only single-layer stack row lines, but in production, but far is not so simple, multi-row line is the absolute strength of the cable companies that!
Generally speaking, single-layer board because of low technical requirements, the majority of small cable factory can produce, and yields about 80 percent can be achieved, the current single-layer board production yields, the blue special electronic yields for more than 95% . The more cable layers, the lower the yield, which is due to various floors of cable lines, materials and process the different layers of stretching rate will vary, the production process, as long as that tiny error, produced by the Tuao cable on each floor will be uneven, all kinds of errors, including the high and low temperature (including the indoor temperature and the temperature and whether high or low temperature, the temperature of heating products, etc.), stress the size of the fine copper and so on, all right Impact on the quality of products, thereby reducing yields.
Multi-row production line, because of the layers of different materials, different technology, the expansion rate of each floor are different, for example: in the production, it needs to reach the cable length is eight centimeters, the first layer because of material, technology Reasons, the need to produce 8.135 cm-long cable, cable Daidao cooling to a normal temperature, because of the role of Rezhanglengsu, cable will be shortened to eight centimeters long, the second tier may have to produce 8.164 cm in order to shorten the cooling after eight centimeters long, the third layer may have to produce 8.181, 8.112 cm to the fourth floor……, because Rezhanglengsu because of pre-production on the need for accurate calculation of multi-storey row At every level of the expansion rate of cooling after the length and width so as to achieve the same purpose. If the deviation of cable products and the quality of life will be greatly reduced.
In addition, the cable-rise more, some of the board need to drilling, some of the board does not need. As production on the reasons, not the board will require drilling in advance of drilling, and drilling to the plate and do not need to combine layers, which requires a high drilling technology. Because each layer thickness of the cables are often only a very few, or by a few millimetres, so the accuracy of bored very fine. Such as: Motorola V860, such as cable
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