What Is Ultrasonic Spray Technology? Basics & Solar Glass AR Coating Industry Pain Points

As global photovoltaic projects pursue higher power output and longer service life, anti-reflective (AR) coating has become a standard surface treatment for all tempered solar glass, bifacial patterned glass and BIPV building solar glass. A great number of solar glass manufacturers still struggle with unstable coating quality, high chemical slurry cost and frequent defective products via traditional coating methods.

Ultrasonic atomization spray has gradually become a mainstream upgrade solution for solar AR coating lines worldwide. This article explains ultrasonic spray technology in plain language for beginners, differentiates industrial ultrasonic coating from common civilian ultrasonic devices, and sorts out common production troubles faced by global solar glass factories. It is friendly for factory owners, novice engineers and procurement staff without professional coating background.

 

Part 1: Plain Popularization: What Is Industrial Ultrasonic Atomization Spray?

Most people know ultrasonic technology from household humidifiers, but industrial ultrasonic spray used for solar glass coating is totally different in structure, frequency and working purpose. It is a low-pressure, physical precision coating technology designed for nano liquid coating.

 

1.1 Simple Working Principle (Easy For Beginners To Understand)

Energy Conversion: The ultrasonic spray nozzle is equipped with professional piezoelectric ceramic chips, converting electric energy into stable high-frequency micro vibration;

Gentle Liquid Atomization: Continuous vibration breaks the intermolecular force of AR nano sol (SiO₂ / TiO₂ coating liquid), turning liquid into uniform tiny spherical mist droplets, no high-pressure air squeezing or smashing;

Smooth Film Forming: Low-speed mist falls evenly on cleaned solar glass surface, forms a thin, flat nano coating after heating curing.

 

1.2 Core Features of Industrial Ultrasonic Spray For PV Glass

Uniform tiny mist: Droplet size stable between 12-48μm, fit nano-level AR coating making;

Self-anti-clogging nozzle: Built-in continuous vibration avoids coating particle buildup, less manual cleaning work;

Zero glass damage: Soft mist landing will not scratch textured patterned glass surface;

No liquid deterioration: Room-temperature atomization keeps original performance of hydrophobic, anti-UV AR coating liquid.

 

1.3 Quick Comparison: Ultrasonic Spray VS Traditional Solar Coating Methods

Coating Method	Main Factory Disadvantages	Ultrasonic Spray Improvements
High-pressure Air Spray	30%+ coating liquid waste, uneven film, glass surface pinholes, color difference	High liquid utilization, smooth coating, unified glass appearance
Dip Coating	Huge liquid consumption, thick coating on glass edge, hard thickness control	Single-side precise coating, save coating raw material
Vacuum Sputtering / CVD	Expensive machine cost, high power consumption, low daily output	Low investment cost, energy-saving, compatible with existing glass production lines

 

Part 2: Why Must Solar Glass Add AR Anti-Reflective Coating?

Uncoated raw solar glass will reflect nearly 8%-10% sunlight on single side, total double-side light reflection loss reaches 14%. Lost sunlight directly reduces power generation of solar modules.

Qualified ultrasonic-made AR coating can lower glass reflectivity below 1.8%, raise light transmittance above 93.7%. Verified by global outdoor power station data:

AR coated solar glass improves module power generation by 2.9%-3.8% yearly, and adds anti-dust, anti-corrosion, anti-aging protection for solar panels.

Well-coated solar panels adapt to desert, coastal, high-temperature harsh outdoor environments, reaching standard 25-year service life.

 

Part 3:  Common AR Coating Pain Points Troubling Solar Glass Factories

Based on field investigation of global PV glass manufacturers, these universal problems lower factory profit and product competitiveness:

Unqualified optical performance: Uneven coating leads to glass color difference, cannot supply high-end PV module brands;

High AR slurry cost: Valuable nano coating liquid overflows and rebounds during spraying, causing huge material waste;

Easy coating peeling off: Coating adhesion weak, falls off after rain washing or temperature change, fails IEC durability test;

Low finished product yield: Lots of defective glass with surface particles, bubbles and edge overflow, increasing rework cost;

Inflexible production: Old coating machines cannot switch common AR, self-cleaning AR, anti-salt AR liquid freely, limiting product diversification.