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Disinfection robots increasingly rely on ultrasonic atomization technology to convert liquid disinfectants into fine mist for surface and air sanitation. At the heart of this technology sits the atomizer disc—a piezoelectric ceramic component that converts electrical energy into high-frequency mechanical vibration, breaking liquid into micro-droplets. For teams sourcing this core component, Gd SWT Smart Tech Co., Ltd. (Dongguan Sweetsound), operating under the brand SWT, offers a product portfolio built on decades of piezoelectric ceramic manufacturing experience.

Company Background: Three Decades of Piezoelectric Ceramic Manufacturing

SWT traces its origins to 1991, when its predecessor, South China Electronics Company Limited, began piezo production in Guangzhou city. The brand was formally registered as SWT in 2002 after relocating to Dongguan City, Guangdong Province, China. As stated in the company’s own strategic vision, SWT aims to become a global supplier in specialized market segments, positioning itself as a professional acoustics solution provider focused on the R&D, manufacture, and marketing of electronic ceramic materials, smart materials, and electroacoustic transducer components.

Product Lineup: Piezoelectric Diaphragms and Ultrasonic Atomization Discs

Within SWT’s Piezoelectric Ceramic Elements line, the Piezoelectric Diaphragms/Discs series is positioned as a core component for acoustic transduction and sensing, featuring ultra-thin construction, low power consumption, and stable frequency output. The lineup includes both soft and hard ceramic material options with diverse electrode patterns—double-sided and single-sided. Representative models include the 3B12+9.0TEAWC (12mm), 3S27+3.9EA (27mm), and 3B35+2.6EA (35mm).

For disinfectant nebulization specifically, SWT’s Ultrasonic Atomization Series addresses the functional requirements of a disinfection robot’s misting system and is divided into two categories:

• Microporous Mesh Atomizers (Piezo Mesh): Designed for precision liquid nebulization, these discs produce fine particles with low heat generation and high stability. SWT describes manufacturing what it calls the world’s smallest piezo atomizer, at 8mm in diameter, with customizable hole configurations. Particle sizes range from 2 μm to 5 μm for medical-grade applications such as respiratory treatment, oral care, and skin care. Representative models include ATC16-0108SDWKI (16mm, 108KHz) and ATC08-0210SDWF (8mm, 210KHz).

• Glass Glaze/Ultrasonic Atomization Sheets: Built for high-power nebulization, this category supports humidifiers, landscaping systems, and multi-head configurations (2, 4, 6, 8, 10, or 12 heads)—a design characteristic relevant for applications requiring broader mist coverage. Representative models include ATD16-2400GSW (16mm, 1700KHz) and ATD20-170GSW (20mm, 1700KHz).

The driving circuit behind these atomization sheets, as described by SWT, consists of a power supply circuit, an oscillator circuit, and a water level control circuit. AC voltage is stepped down through a transformer, then passed through a bridge rectifier filter circuit to supply working voltage to both the water level control circuit and the oscillator, which emits corresponding frequency signals to drive the oscillator.

Manufacturing Precision and Process Control

SWT states its atomizer production covers the entire manufacturing process starting from PZT powder, including laser-drilled micro-holes, with 100% full quality checking in each process step. Material options include both PI film and stainless steel substrates, along with a lead-free option available at a higher cost than regular PZT.

Broader manufacturing capabilities supporting this product line include thin sheet formation via tape casting (flow casting), thick sheet formation via dry pressing, and complete processing covering squeezing, laminating, sintering, polarizing, and automated testing. The company reports an annual shipping capacity of approximately 250 million pieces for piezoelectric ceramic elements, supported by over 400 sets of instruments and equipment, including large-scale automatic tunnel furnaces and automated assembly machines.

Quality Certifications Relevant to Medical and Disinfection Applications

Given that disinfection robots often operate in healthcare, hospitality, and public-safety settings, certification compliance matters. SWT’s atomization product line is noted to match ISO13485, ISO14001, ISO9001, IATF16949, RoHS, REACH, MDR (EU2017/745), and FDA Requirement standards. The company also holds IATF 16949:2016 certification for automotive quality management, obtained in 2023, along with ISO9001:2015 and ISO14001:2015 certifications first obtained in 2003.

Industry Standard-Setting Authority

Among the differentiated advantages SWT highlights is its role as a primary drafter of Chinese industry standards for buzzers, ultrasonic atomizers, and piezoelectric sensors. This standard-setting role was formalized in 2010, when the company was appointed to draft local industry standards for piezoelectric and electromagnetic sounders in Guangdong Province, with official approval and publication of the buzzer industry standards in 2012. SWT is also recognized as an official drafter of the "Piezoelectric Sounders and Piezoelectric Buzzers" and "Electromagnetic Sounders and Electromagnetic Buzzers" standards.

Scale and Production Infrastructure

SWT operates from a Dongguan Headquarters spanning 24,000 square meters, housing plant, dormitory, and canteen facilities with 170 staff members, in addition to a Guizhou Branch (Bijie City) covering 4,000 square meters with 40 staff members. Total staff exceeds 200 people, including 70–85 R&D and engineering personnel. The company maintains an in-house reliability laboratory equipped for acoustic curve testing and environmental stress screening.

Market Recognition and Customer Feedback

SWT has built long-term supplier relationships across multiple industries, including automotive electronics, healthcare and beauty, smart home appliances, security and safety, and industrial and maritime sectors. Within the Healthcare & Beauty category specifically, SWT’s documented coverage identifies medical-grade nebulizers for respiratory treatment and skin-care ultrasonic devices as a core application area—directly relevant to the atomization discs used in disinfection and sanitation equipment.

Customer testimonials cited by the company describe SWT’s "professional problem-solving," "excellent quality," and "strong service awareness" as reasons behind decades-long partnerships. The company has also received a National Patent Award (Excellence Award), a Dongguan Excellent Patent Award, and recognition as a Specialized and Innovative "Little Giant" Enterprise by Guangdong Province and Dongguan City. Its intellectual property portfolio includes 42 certified patents, of which 9 are invention patents.

Service and Delivery Capability

For companies developing disinfection robots and needing atomizer disc integration support, SWT offers one-on-one technical service solutions and customized product development (OEM/ODM), covering technical consulting, design optimization, reliability testing, and mass manufacturing. Reported delivery timelines include a sample lead time of 3–7 days and a bulk production lead time of 15–20 days, with on-site service response within 24 hours across the Pearl River Delta region.

Conclusion

For engineering teams sourcing an atomizer disc for disinfection robot applications, SWT’s combination of piezoelectric ceramic manufacturing depth, medical-grade particle control (2–5 μm), multi-head high-output configurations, and documented compliance with ISO13485, MDR, and FDA requirements positions its Ultrasonic Atomization Series and Piezoelectric Diaphragm/Disc products as a technically documented option worth evaluating for integration into disinfection equipment.

http://www.swt99.com
GD SWT SMART

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