dry-film resist的意思|示意

Dry-film resist is a resist material used in photolithography process in the production of printed circuit boards (PCBs). It is a photosensitive polyimide film which is laminated onto the copper-clad surface of the PCB. It is then exposed to ultraviolet (UV) light through a photomask, causing the exposed areas to become less soluble when developed in an alkaline solution. This creates a pattern of exposed copper and covered areas of resist, which can then be used to create the circuitry of the PCB either by etching away the exposed copper or by selective metallization.

Dry-film resist can be applied to double-sided boards or multilayer boards, and it is an excellent choice for the PCB production process because it is fast and efficient. It can process a board in a fraction of the time required by the traditional wet-film resist process. In addition, it eliminates the need to prepare and store liquid photoresist, and it produces excellent results, with line widths down to five microns possible.

Overall, dry-film resist is a convenient, cost-effective way to create a printed circuit board. It is not only fast but produces highly accurate results, making it a great choice for both prototyping and high-volume production.