Bi-color LED Flexible Strip With The Basic Process

Bi-color LED Flexible Strip with the basic process

    1 choice of double color LED flexible tape material

    2 production process and the control of key parts

    2.1 production process

    2.2 inner layer of single-chip graphics transfer

    2.3 Multi-layer positioning of flexible materials

    2.4 Lamination

    2.5 drilling

    2.6 to drill, corrosion

    2.7 Electroless copper plating, electroplating copper

    2.8 color LED flexible tape with surface resistance welding and solderability protection layer

    2.9 shape processing

    Two - color LED flexible tape placement process requirements and precautions

    In the two-color LED flexible belt (Bi-color LED Flexible Strip) SMD on the process requirements in the development of miniaturization of electronic products, a considerable part of the consumer products, surface mount, due to the relationship between the assembly space, the SMD are mounted on Color LED flexible tape to complete the assembly of the machine. Bi-color LED Flexible Strip SMD surface mount has become one of the development trend of SMT technology. For the surface mount process requirements and attention points have the following points. The following are the same as the "

    A Bi-color LED Flexible Strip with a conventional SMD placement

    Features: placement accuracy requirements are not high, the number of components is small, the components of the main resistance and capacitance, or individual shaped components. The following are the same as the "

    The key process: 1. Paste printing: two-color LED flexible belt with external positioning in the printing of special pallets, the general use of small semi-automatic printing presses can also be used manual printing, but manual printing quality than semi-automatic printing is worse. The following are the same as the "

    2. Placement: generally can be used manual placement, location accuracy of some of the individual components can also be used manual placement machine placement. The following are the same as the "

    3. Welding: generally use reflow process, special circumstances can also be used spot welding. The following are the same as the "

    Two-color LED flexible with high-precision placement

    Features: Bi-color LED Flexible Strip to have the substrate positioning with MARK mark, two-color LED flexible belt itself to be flat. Two-color LED flexible with a fixed hard, consistent production when the consistency is more difficult to ensure that the equipment requirements. Another printing paste and paste Installation process control more difficult. The following are the same as the "

    The key process: 1. Two-color LED flexible with fixed: from the printed patch to the reflow soldering fixed on the pallet. The pallet required thermal expansion coefficient is small. There are two fixed methods, the placement accuracy of QFP lead spacing 0.65MM or more When using the method A; the placement accuracy is QFP lead spacing 0.65MM below when using method B. The following are the same as the "

    Method A: The pallet is set on the positioning template. The Bi-color LED Flexible Strip is fastened to the pallet with a thin, high temperature resistant tape, and then the pallet is separated from the positioning template for printing. The high temperature resistant tape should be of moderate viscosity and must be easy after reflow Peeling, and in the Bi-color LED Flexible Strip without residual glue. The following are the same as the "

    Method B: The pallet is customizable, and its process requirements must be subjected to multiple thermal shocks. The pallet is equipped with T-type positioning pin, the pin height is slightly higher than the two-color LED flexible belt. The following are the same as the "

    2. Paste printing: Because the pallet is loaded with two-color LED flexible belt, Bi-color LED Flexible Strip with high-temperature tape positioning, so that the height and the pallet plane is inconsistent, so the printing must use the elastic scraper. Paste ingredients on the printing effect of a greater impact, you must use the appropriate solder paste. Also on the choice of B method of printing templates need to be special treatment. The following are the same as the "

    3. Patching equipment: First, the solder paste printing presses, printing presses with the best optical positioning system, otherwise the welding quality will have a greater impact.Second, two-color LED flexible belt fixed on the pallet, but the two-color LED flexible belt And the pallet will always produce some tiny gap, which is the biggest difference between the PCB substrate.Therefore, the setting of the equipment parameters on the printing effect, placement accuracy, welding effect will have a greater impact.Therefore, two-color LED flexible belt The mounting process is critical to process control.