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HDI (High Density Interconnect) circuit boards are an advanced circuit board technology whose manufacturing process involves multiple complex steps.

The following is the detailed production process flow of HDI circuit boards:

HDI PCB production preparation stage

Before starting to manufacture HDI circuit boards, you need to prepare the following materials:

*Substrate: Polyimide or polyester films are usually used as substrates because of their high heat resistance and mechanical strength.

• Copper Foil: A metallic material used as a conductive path.
• Insulating layer: used to isolate conductive paths at different levels.
• Resist: Used to protect non-conductive areas from etchants.

HDI circuit board production light painting and exposure

1. Photo drawing: Convert the designed circuit pattern into a photomask to form a conductive path on the substrate.
2. Exposure: Place the photomask on a substrate coated with photosensitive material, and solidify the photosensitive material through ultraviolet irradiation to form a circuit pattern.

HDI circuit board electroplating

Plating is performed on a substrate where conductive paths have been formed to increase conductivity. Copper plating is usually done using electroless plating or electroplating methods.

HDI PCB removal and etching

1. Film removal: Remove the resist to expose the conductive paths on the substrate.
2. Etching: Use chemical etchants to remove non-conductive areas on the substrate to form the final circuit pattern.

HDI PCB drilling and hole metallization

1. Drilling: Small holes are drilled into the substrate to create connections between conductive paths at different levels.
2. Hole metallization: A metal layer is formed on the inner wall of the drilled hole through electroplating or chemical plating so that conductive paths at different levels can be connected to each other.

HDI circuit board inspection and repair

1. Inspection: Use various inspection methods (such as visual inspection, X-ray inspection, etc.) to ensure the manufacturing quality of HDI circuit boards.
2. Repair: Repair unqualified HDI circuit boards to improve their reliability.

HDI circuit board finished product inspection and packaging

1. Finished product inspection: Conduct appearance and performance inspection on the completed HDI circuit board to ensure that it meets the design requirements.
2. Packaging: Properly package qualified HDI circuit boards for transportation and storage. Packaging is usually in vacuum-sealed packaging or moisture-proof packaging to protect the circuit board from the environment.

HDI circuit board post-processing and testing

1. Post-processing: Perform necessary post-processing on the HDI circuit board, such as cleaning, film removal, drying, etc., to ensure its quality and reliability.
2. Testing: Conduct electrical performance testing on the HDI circuit board to ensure its normal operation. Testing includes functional testing, parameter testing, aging testing, etc.

The above is the detailed production process flow of HDI circuit boards. Close coordination is required between each step to ensure the quality and reliability of the final product.

During the production process, attention must also be paid to environmental protection and production safety to avoid adverse effects on the environment and employees.

Fumax HDI (High Density Interconnect) Factory

Fumax HDI (High Density Interconnect) factory focuses on the production of high-density interconnect boards, which are widely used in communications, medical, aerospace and other fields. Characterized by high precision, high density and high reliability, they provide powerful interconnect capabilities for complex electronic systems.
HDI factories use advanced process technology and equipment to ensure high quality and efficient production of products.
From design to manufacturing, every link undergoes strict quality control to ensure the reliability and stability of the final product. HDI Factory not only provides customers with high-quality products, but also provides comprehensive technical support and solutions to help customers solve various interconnection problems. Please contact us for specific service items.