Flow Meters and Nozzles for PCBs

What is the basic definition of a PCB (Printed Circuit Board)?

A PCB (Printed Circuit Board) serves as the fundamental carrier for electronic devices and the critical substrate for connecting and mounting various electronic components. It is constructed on an insulating base plate, with conductive copper foil traces and connection pads fabricated on its surface through precision printing, etching, and copper plating processes, forming an orderly circuit interconnection network.

PCBs can replace traditional cluttered wire soldering, standardize circuit layouts, and enable orderly assembly and stable electrical conduction of components such as resistors, capacitors, chips, and interfaces. Through their layered wiring and insulated isolation design, PCBs effectively prevent circuit short circuits and signal interference, significantly reducing the size of electronic products.

From household appliances, air conditioners, and industrial control equipment to precision instruments and communication products, all electronic devices rely on PCBs. These components serve multiple functions, including structural support, circuit transmission, and thermal management, making them the cornerstone of modern electronics manufacturing and ensuring the stable and efficient operation of various electrical devices.

AI Servers Become the Core Driver of Growth in the PCB Industry

The explosive growth of AI computing power is fundamentally reshaping the growth dynamics of the PCB industry, becoming its core driver as it shifts the sector from a phase of saturated competition to a high-growth sector with robust prospects. While the traditional PCB industry has maintained a steady annual growth rate of only 3%-5%, the surge in demand for AI servers has ignited the high-end PCB market, achieving structural growth characterized by simultaneous increases in both volume and price.

At the quantitative level, global AI server shipments are surging rapidly, expected to exceed 3.5 million units by 2025 and reach 7 million units by 2026, directly driving a sharp increase in PCB demand. Each AI server consumes 3 to 5 times more PCBs than traditional servers, triggering explosive demand for high-end products such as high-layer backplanes and advanced HDI solutions.

From a cost perspective, the technical barriers for AI server PCBs have surged dramatically, with the number of layers increasing from the traditional 12–16 layers to 24–40 layers. This necessitates the use of low-dielectric special materials, raising the unit cost to 5–10 times that of conventional servers. The global AI server PCB market is projected to exceed RMB 40 billion by 2025 and surpass RMB 90 billion by 2026.

Driven by AI, the PCB industry is accelerating its transformation toward higher frequency, higher speed, higher density, and greater reliability, emerging as one of the most promising growth sectors in the electronics manufacturing sector.

Intelligent and Electrified Upgrades of EVs: Empowering the Development of the Automotive PCB Industry

The comprehensive intelligent and electrification upgrades of EVs are becoming the core driver behind the explosive growth of the automotive PCB industry, propelling the sector toward leapfrog development characterized by simultaneous increases in both volume and price.

In terms of electrification, the three-electric systems (BMS, MCU, OBC) in new energy vehicles have completely replaced traditional mechanical components, with the PCB area per vehicle reaching 3–5 square meters and its value surging from 500 yuan for fuel-powered vehicles to 2,000–3,000 yuan. The evolution of the 800V high-voltage platform has driven demand for thicker copper, better heat dissipation, and high-voltage-resistant PCBs, simultaneously raising both technical barriers and product value-added.

In the intelligent technology sector, advanced ADAS systems, smart cockpits, and domain controllers are rapidly gaining traction. Applications such as millimeter-wave radar, LiDAR, and multi-screen integration are driving demand for high-frequency, high-speed PCBs, HDI boards, and high-layer-count backplanes. These premium products carry a value 3–5 times higher than conventional PCBs, making them the primary growth drivers.

Driven by dual factors, the automotive PCB market continues to expand, with China's market size exceeding RMB 24 billion by 2025. The high-end production capacity is in short supply, driving the industry toward upgrades in high density, high reliability, and high frequency, thereby unlocking long-term growth potential.

Characteristics and Distinctions of Various Printed Circuit Boards in Different Application Scenarios

With the diversified development of the electronics industry, different application scenarios require specific types of PCBs. Each PCB board variant exhibits distinct differences in structure, performance, and manufacturing processes, catering to the unique demands of various applications.

Standard single-layer and double-layer PCBs feature simple structures, low cost, and mature manufacturing processes. With fewer conductive traces, they offer limited heat dissipation and load capacity, making them primarily used in basic electronic products such as small household appliances, ordinary lighting fixtures, and simple industrial control equipment to meet fundamental circuit connectivity requirements.

Multilayer PCBs feature numerous layers, dense wiring, high space utilization, stable signal transmission, and strong interference resistance, making them widely used in servers, communication equipment, and industrial control instruments.

The HDI (High-Density Interconnect) board features precise wiring and microscopic aperture dimensions, making it ideal for slim and lightweight devices. It is primarily used in consumer electronics such as smartphones, tablets, and smart wearables.

The high-frequency, high-speed PCB utilizes specialized substrate materials, offering low loss and minimal interference, making it ideal for high-speed signal transmission. Widely employed in AI servers, automotive radars, and autonomous driving domain controllers, it withstands high voltage, elevated temperatures, and complex operating conditions, ensuring long-term stable equipment performance.

Core Manufacturing Processes of PCB Circuit Boards from Raw Materials to Final Products

The PCB manufacturing process, from raw materials to finished products leaving the factory, follows a standardized and coherent core production workflow.

•  Substrate cutting: Using copper-clad laminate as the base material, cut and edge-smooth the sheets according to product dimensions to ensure uniform specifications and prepare the surface for subsequent processing.

•  Inner layer circuit fabrication: The inner conductive circuit is formed through coating a dry film, exposure, development, and etching, followed by a blackening treatment to enhance interlayer adhesion.

• Lamination: A multi-layer board is paired with a semi-cured sheet, with the inner and outer copper foils stacked together and then pressed under high temperature and pressure to form a monolithic board structure.

• Drilling operation: Precisely drill through-conductivity holes, component holes, and positioning holes to achieve inter-layer circuit connectivity.

•  Copper plating: A copper layer is deposited on the hole walls, combined with full-board electroplating to form a complete conductive path between the holes and the board surface.

• Outer layer circuit: Replicate the inner layer process to create the precision circuit patterns on the outer layer.

• Surface protection: Spray solder mask green oil and cure the circuit protection layer to prevent oxidation and short circuits.

•  Text printing and surface treatment: Printing component markings, combined with processes such as tin spraying and gold plating, enhances solderability.

• Forming and Inspection: The outer shape is cut and divided into panels, followed by electrical connectivity testing, impedance measurement, and comprehensive visual inspection. Upon passing all inspections, the product is deemed qualified.

Fluid Control Elements: Application Advantages and Functions of Nozzles and Flow Meters in the PCB Industry

In the entire PCB manufacturing process, nozzles and flow meters serve as core fluid control components, operating throughout critical stages such as development, etching, electroplating, flux resistance, and soldering. They directly influence circuit precision, product yield, and production costs, making them essential for achieving large-scale mass production of high-end PCBs (for AI servers and automotive applications). Their synergistic operation provides dual support for PCB manufacturing: precise coating and stable flow control.

The primary function of the nozzle is to precisely atomize or direct the spraying of fluids such as chemical solutions, pure water, and flux, meeting the requirements of various manufacturing processes. In development and etching operations, high-pressure conical micro-nozzle sprayers achieve micron-level uniform spraying, ensuring high precision in fine-line etching and reducing circuit breakage and short-circuit defects. For water rinsing, low-pressure wide-angle sector nozzles enable extensive, uniform cleaning that protects delicate circuits while conserving water. In solder mask application and wave soldering processes, ultrasonic atomization nozzles and high-temperature resistant alloy nozzles ensure uniform coating distribution and precise solder deposition, significantly lowering product defect rates. The core advantages include uniform spraying, precise positioning, and strong adaptability, enabling compliance with processing requirements for PCBs of various specifications.

Flow meters are responsible for real-time monitoring and precise control of fluid flow, forming a closed-loop control system. In etching and electroplating solution circulation processes, acid-and alkali-resistant electromagnetic and ultrasonic flow meters enable stable control of fluid velocity and concentration, ensuring uniform copper thickness and consistent circuit impedance. For flux and pure water transportation, micro-flow meters and turbine flow meters provide accurate flow measurement, reducing material waste and water consumption. In special gas transportation, mass flow meters operate unaffected by temperature and pressure, creating an oxygen-free environment to prevent copper surface oxidation. Their advantages include high precision, corrosion resistance, and rapid response, providing critical data support for process stability.

The synergistic application of these technologies can increase high-end PCB yield by 10%-20% and reduce material costs by over 30%. Perfectly tailored to meet the stringent precision manufacturing requirements of high-end PCBs driven by AI and new energy vehicles, this solution has become a critical configuration for PCB manufacturers to enhance their core competitiveness.