TPU Spray Coating

Ultrasonic TPU Spray Coating

This is a method of using ultrasonic atomization technology to accurately and efficiently spray thermoplastic polyurethane (TPU) in the form of a thin film onto substrates such as fabrics, metals, plastics, or glass.

TPU: a multifunctional elastomer known for its excellent elasticity, wear resistance, oil/grease resistance, and durability. It can be designed as a breathable material, making it popular in industrial textiles.

Ultrasonic spraying: a process that uses high-frequency sound waves (ultrasonic waves) to break liquid into fine, low-speed micrometer sized mist droplets, instead of using high pressure like traditional spraying systems.

How does the ultrasonic spraying process work?

This process involves several key steps and components:

• Raw material preparation: Dissolve TPU particles in a solvent (such as DMF dimethylformamide, or a more environmentally friendly water-based dispersion option) to create a liquid solution or dispersion with the correct viscosity suitable for spraying.
• Liquid delivery: A precision pump delivers liquid TPU solution to the spray nozzle.
• Ultrasonic atomization: The core of the system is the ultrasonic nozzle. It contains a piezoelectric transducer that vibrates at extremely high frequencies (e.g. 20 kHz to 120 kHz).
  – These vibrations are amplified and transmitted to the nozzle tip.
  – When the liquid flows through the vibrating tip, capillary waves will form on its surface.
  – The amplitude of these waves continues to increase until the peaks are ejected from the surface, forming extremely small, soft mist like droplets with a very consistent size distribution.
• Spray application: Low speed mist is guided onto the target substrate. Low speed prevents “rebound” and overspray, ensuring material efficiency and precise coating patterns.
• Curing/drying: The coated substrate is passed through a drying oven or channel. The solvent evaporates, leaving a continuous, thin, and uniform film of pure TPU. For aqueous systems, this is usually just a drying stage. For solvent based systems, a solvent recovery system may be required.

This technology is driving innovation in many industries:

• Industrial textiles and wearable devices:
  Waterproof/Breathable Fabric: Manufacturing microporous membranes on fabrics for raincoats, outdoor gear, and military uniforms (a sustainable alternative to laminated PTFE/PU films).
  Wear resistant coating: Reinforce areas on backpacks, work gloves, and footwear.
  Airbag fabric: coated with a thin and uniform silicone or PU coating for lubrication and air retention.
• Medical apparatus and instruments:
  Balloon catheter: A precise, needle free drug washout or lubrication coating is applied to the balloon during angioplasty.
  Stents and implants: coated with a biocompatible TPU layer.
• Electronics and Energy:
  Battery electrodes: Ultrasonic spraying is a standard method for coating precision cathode and anode slurries. TPU based coatings can be used for flexible battery components or separators.
  Flexible electronics: Manufacturing protective and flexible encapsulation layers on circuits.
• Automotive and Aerospace:
  Interior parts: Apply wear-resistant and easy to clean coatings to fabrics and plastics.
  Composite materials: Apply slurry or primer coating to fibers.

Ultrasonic spraying TPU coating represents the integration of advanced polymer science and precision application technology. For industries that require ultra-thin, high-performance, consistent, and durable polymer coatings while minimizing waste, it is the preferred method. With the increasing demand for smart textiles, micro medical devices, and advanced energy storage, this technology is destined to become even more critical.

If you are considering using this process for specific applications, it is recommended to consult both TPU resin formulation suppliers and ultrasonic spraying equipment manufacturers to optimize the entire system.

About Cheersonic

Cheersonic is the leading developer and manufacturer of ultrasonic coating systems for applying precise, thin film coatings to protect, strengthen or smooth surfaces on parts and components for the microelectronics/electronics, alternative energy, medical and industrial markets, including specialized glass applications in construction and automotive.

Our coating solutions are environmentally-friendly, efficient and highly reliable, and enable dramatic reductions in overspray, savings in raw material, water and energy usage and provide improved process repeatability, transfer efficiency, high uniformity and reduced emissions.

Chinese Website: Cheersonic Provides Professional Coating Solutions