Before you design or buy a printed circuit board, firstly make understand what is silkscreen of printed circuit board design? What is the function of the silk screen layer? The most common silk screen PCB printing technology. Now JHDPCB will explain it all for you.
Three Main Process Methods Of Silk Screen Printing.
The following are the most common PCB silk screen technology processes and processes on PCB:
- Manual Silk Screen PCB: This process can be used when the line width is greater than 7mm and the registration tolerance is 5mm. For this method, you will need pcb silkscreen minimum text size and trace template made of nylon. The oil is printed onto the plate through the stencil. Next step,make the PCB board baked in a curing oven and let it to besolidification.
- Liquid Photo Imaging (LPI): This procedure supplied greater correctness and legibility than manual screen printing. Using this method when the trace width is greater than 4 mil. Liquid photo imaging is very similar to the process of applying solder mask. In this case, a liquid photoimageable epoxy was applied to the laminate and then exposed to UV light. After that, the PCB board is developed and cured.
- Direct Legend Printing (DLP): This is the most correct way to add PCB silk screen, but it is very high-priced. In such pcb silkscreen process, using an inkjet projector with acrylic pcb silkscreen ink, which have relevance to the original print circuit board from the CAD data. The pcb silkscreen acrylic inks is solid with UV light during printing. It should be noted that acrylic inks will not cure on boards with a silver finish.
PCB Etching Technology And Solution
The Importance Of PCB Etching.
Proper PCB board etching techniques have always been of great importance as etching is one of the most important pcb etching process in PCB manufacturing. PCB manufacturers use etching to determine the amount of copper remaining on the laminate, which defines the copper pads and traces that make circuits on the laminate. This is related to whether the final PCB circuit can be used or not.
What Is The Etching Process In PCB Manufacturing?
The hardened photoresist on the copper inner layer protects the traces, vias and other areas of the metal circuit, and the remaining photoresist is removed to expose the bare copper. Etching is then performed to remove unprotected bare copper, leaving the required circuitry. After removing the hardened photoresist, only the copper circuit remains in the inner layer. Repeat this step for each pair of inner layers until all layers are complete. The next step is to laminate all the inner layers with the epoxy-impregnated fiberglass board, called the “prepreg.” Once the top and bottom of the board are covered by a thin layer of copper foil, the board can be laminated together by heating and pressure. Once laminated, a through-hole is drilled in the plate to prepare for the next etching process