High Transparency High Precision Reusable PCB Film Printed Circuit Board Film for Optical Exposure

Custom specifications available upon request.

1. Design Output — Designers draw each layer of the circuit board (such as top copper, bottom copper, silkscreen layer, and solder mask layer) using PCB design software. Once the design is complete, the software generates the corresponding film files.
2. Optical Exposure — The film files are printed onto transparent film material to serve as a "template." During PCB manufacturing, the film files are transferred to the photosensitive layer of the circuit board through optical exposure technology, forming the corresponding circuit patterns.
3. Subsequent Processes — After exposure, the unexposed photosensitive coating is etched away, leaving a precise circuit pattern that forms copper circuits, pads, and other structures, completing the manufacturing of one layer.

A complete set of PCB film files usually includes the following layers:

1. Copper Layer Film — Contains all copper circuits, pads, and other structures on the circuit board, used to define the copper layer during the etching process.
2. Silkscreen Layer Film — Depicts identification information on the circuit board (such as component labels, text, and symbols), which is usually screen-printed on the surface of the circuit board.
3. Solder Mask Layer Film — Indicates the solder mask ink pattern on the PCB, usually used to cover areas that do not require soldering to prevent short circuits.
4. Drilling Layer Film — Shows the positions where holes need to be drilled on the circuit board, including through holes and blind holes.
5. Electrical and Test Layer Film — Used to verify electrical connections and test the connectivity of circuits.

1. Single-layer Film — Used for single-sided PCB designs with only one copper layer, typically without complex additional layers.
2. Double-layer Film — Used for double-sided PCB designs; the film files include copper layers on both sides and related connection holes.
3. Multi-layer Film — Used for multi-layer PCB designs; the film files contain multiple copper layers, interlayer connections, and other characteristic layers.
4. Reverse Film — Also known as negative film, it is the opposite of ordinary film: the black part represents the area to be etched, while the white part represents the area not to be etched.

1. High Precision — The precision of PCB film directly affects the quality of the circuit board. Accurate film ensures that the position of each circuit, pad, and hole strictly meets the design requirements.
2. High Transparency — Film materials must have high transparency to allow light to pass through and accurately expose the photosensitive coating on the PCB substrate.
3. Reusability — A once-produced film file can be used multiple times, making film indispensable in mass production.

PCB film is widely used in:

1. Electronic Product Manufacturing — Production of circuit boards for consumer electronics such as mobile phones, computers, and home appliances.
2. Industrial Control Systems — Circuit board design for industrial systems such as automation equipment and instruments.
3. Medical Equipment — Circuit boards for high-precision medical devices.