pcb干膜负片生产流程
    英文回答：
    PCB dry film negative production process involves several steps. First, the substrate material, typically a copper-clad laminate, is prepared. This involves cleaning the surface to remove any dirt or contaminants. Then, a layer of dry film is applied onto the substrate using a lamination process.
    Once the dry film is applied, the next step is to expose the film to UV light. This is done by using a photomask, which contains the desired circuit pattern. The photomask is aligned with the dry film and then exposed to UV light. The areas of the film that are exposed to light will become hardened, while the areas covered by the mask will remain soft.
    After exposure, the film is developed to remove the soft, unexposed areas. This is typically done by immersing the film in a developer solution, which dissolves the unexposed portions of the film. The developer solution may be agitated or sprayed onto the film to ensure complete removal of the soft areas.
    Once the film is developed, it is rinsed to remove any remaining developer solution. Then, it undergoes a post-development baking process to further harden the remaining film. This baking process helps to improve the adhesion of the film to the substrate and ensures its stability during subsequent processing steps.
    After baking, the film is inspected for any defects or imperfections. This may involve visual inspection or the use of specialized equipment to check for proper alignment, resolution, and overall quality of the circuit pattern. Any defects found may require rework or the entire film may need to be discarded and the process restarted.
    Finally, the film is ready for use in the PCB manufacturing process. It is typically laminated onto the substrate material, with the hardened areas forming the circuit pattern. The film is then exposed to chemicals that etch away the exposed copper, leaving behind the desired circuit traces. Additional steps, such as plating or solder masking, may also be performed to complete the PCB fabrication process.
xposed    中文回答：
    PCB干膜负片生产流程包括几个步骤。首先，准备基板材料，通常是铜包覆层压板。这需要清洁表面，去除任何污垢或污染物。然后，使用层压工艺将一层干膜涂在基板上。
    干膜涂覆后，下一步是将膜暴露于紫外线。这是通过使用光掩模来完成的，光掩模包含所需的电路图案。将光掩模与干膜对准，然后暴露于紫外线。暴露于光线的区域会变硬，而被掩模遮盖的区域则会保持软状。
    暴露后，膜进行显影以去除软状的未暴露区域。通常是通过将膜浸泡在显影液中来完成的，显影液会溶解膜的未暴露部分。显影液可以通过搅拌或喷洒到膜上，以确保完全去除软状区域。
    显影后，膜进行冲洗以去除任何剩余的显影液。然后，进行后处理烘烤过程，进一步硬化剩余的膜。这个烘烤过程有助于提高膜与基板的附着力，并确保其在后续处理步骤中的稳定性。
    烘烤后，对膜进行检查以寻任何缺陷或瑕疵。这可能涉及目视检查或使用专用设备来检查电路图案的对准、分辨率和整体质量。发现任何缺陷可能需要返工，或者整个膜可能需要丢弃并重新开始流程。
    最后，膜准备好用于PCB制造过程。通常将其层压到基板材料上，硬化区域形成电路图案。然后，将膜暴露于化学物质中，腐蚀掉暴露的铜，留下所需的电路走线。还可以执行其他步骤，如电镀或焊盖，以完成PCB制造过程。