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Texte wiki de la nouvelle page, après la modification (new_wikitext) | '<br>In my last article I discussed flex pcb manufacturing in Mexico. As you may know flex PCBs have two or more layers of PCB material stacked one on top of the other. The material layers are typically printed using a laser, but sometimes a heat press is used. Either way the thickness of the layers is critical to the end product, because a thin PCB has less ability to withstand stress, thus making it more susceptible to cracking and breaking.<br><br><br>Some manufacturers and electronics firms like to build PCBs from scratch using printed circuit boards (PCBs) without a PCB bottom or side. This is referred to as "PCB printing" or "printed circuit board printing". While it is faster and less expensive to print a PCB with no additional material added, it makes the design difficult because the traces on the back of the board have no impact on the design. This means that the flex pcb thickness must be increased so that the traces can be printed without striking an internal or external surface. This process is called "outside flexing".<br><br><br>However, flex pcb thickness is not only determined by the number and size of the PCB layers, it is also affected by the amount of "overhang" on the top of the PCB. "Overhang" is the distance from the board's top surface to the underside of any component you may put on it. Most PCBs have about 0.05 inches of overhang on top of each component. So if you add five components to a board with a typical web thickness of about 0.08 inches, you will get about a quarter inch of "overhang". In fact, you should get about half that amount.<br><br><br>To get the right amount of overhang, calculate the total area of the components you plan to place on the board. Subtract the area of the boards with a thickness of one percent from this total area. Then multiply this figure by five to get the percentage of "overhang" to avoid. To find the correct flex pcb thickness, use the formula:<br><br><br>For a very simple example, you may wish to put several small components on a small board. The minimum overhang you should avoid is about one percent. If you must have at least two layers, the maximum overhang is about three and a half percent. If you liked this post and you would certainly like to receive more info relating to [https://www.fastturnpcbs.com/ www.fastturnpcbs.com] kindly see our website. You can calculate the appropriate resistivity value by multiplying the resistivity of each individual component by the resistivity of one layer of the flexible pcb manufacturing process. You can also find resistivity values by multiplying the total chord resistance of the board by the total cross-section area of the board.<br><br><br>When the resistivity value is not enough to calculate a true thickness, other measures are required. For instance, the overall thickness and the surface texture of the pcb must be considered. Printed circuit boards with a very smooth and shiny surface have greater flex circuit board flexibility. A matte or textured pcb surface has less flexibility. This can be significant when designing various types of products in which the product must resist wear such as printed circuit boards for electronic products and other machinery parts that frequently experience wear and tear.<br><br><br>If your product does not require smoothness or shiny surfaces, consider using anodized or galvanized pcb as well as the traditional black or white pcb. These options provide increased strength and durability against scratches and other damage. The cost of these materials is less than the cost of using flexible pcb. Consider also using low-density dielectric foam instead of polyester or PVC dielectric foam in your printed circuit boards to improve your flex circuit board manufacturing process and save money on production costs.<br><br><br>It is also important to consider other factors when using to pay for your product. The most important factor is the ability of the PCB to withstand stress from heavy-duty computer components like graphics cards, audio and video cards, hard drives, and other electrical components. Some pubs are referred to as solid state, while others are more flexible. With the correct material and design, you can reduce the number of soldered joints in your product and provide stronger PCBs that can withstand wear and tear.<br>' |
