  +86-15658151051                          sales@xingultrasonic.com 
Articles Detail
Home / Articles / About ultrasonic welding / What's The Ultrasonic Welding Packaging Technology?

What's The Ultrasonic Welding Packaging Technology?

Views: 100     Author: Yvonne Han     Publish Time: 2025-09-23      Origin: Site

What's The Ultrasonic Welding Packaging Technology?


This is a modern packaging sealing method that is efficient, clean, strong, and aesthetically pleasing, widely used across various industries.


I. What is Ultrasonic Welding Packaging Technology?

Ultrasonic welding is a process that uses high-frequency mechanical vibrations (ultrasound) to generate frictional heat at the contact surface of thermoplastic materials, causing them to melt locally under pressure and fuse together.

Simply put, it's like "molecular suturing":

High-frequency vibration: The transducer converts electrical energy into high-frequency ultrasonic vibrations of 20kHz, 30kHz, or 40kHz.

Energy Transfer: The vibrations are transmitted to the packaging material to be sealed via the welding head (horn).

Frictional Heating: The molecules at the contact surface of the packaging material generate instantaneous high temperatures due to high-frequency friction.

Fusion and Curing: The contacting materials rapidly melt and fuse together under pressure. When the pressure is removed, they quickly cool and solidify, forming a secure seal.


II. Core Technology Components

A typical ultrasonic welding system includes:

Power Supply: This converts 50/60Hz mains power into a high-frequency electrical signal.

Transducer/Converter: Converts high-frequency electrical signals into mechanical vibrations of the same frequency.

Booster: Amplifies or reduces the amplitude of the vibrations and transmits them to the welding head.

Horn/Sonotrode: A metal tool that directly contacts the product, precisely transmitting ultrasonic vibration energy to the area to be sealed. Its shape must be customized to the product.

Anvil: A fixed platform that supports the product and provides a counterforce for welding.



d0c8a786c9177f3e6709d775f59b2cc79f3df8dcf835u=2756690944,3539857880&fm=193


ultrasonic welding horn 03


III. Main Applications in the Packaging Field

Flexible Packaging Sealing

Bags: Snack bags (potato chips, nuts), sauce packets, pet food bags, coffee bags, medical tube bags, etc.

Process: The bag's opening is placed between the welding head and the anvil, and the seal is achieved in a single weld. A tear notch can also be punched in.

Hard Shell Packaging Sealing (One of the most common applications)


Blister Packaging: A plastic blister is welded to a heat-sealable paper card backing. Widely used in blister packaging for toys, electronics, hardware tools, cosmetics, and medical devices.

Advantages: Secure and aesthetically pleasing seals, enabling tamper-evident packaging. Consumers must break the card to remove the product.


Tube Packaging Sealing

Used for sealing the ends of toothpaste tubes, ointment tubes, and cosmetic hoses. After welding, it forms a solid barrier to prevent leakage and contamination.


Non-Woven Product Sealing

Medical protective clothing, surgical gowns, masks (such as N95 ear strap welding and edge sealing), sanitary products, shopping bags, etc. Ultrasonic waves can seamlessly fuse non-woven fibers without creating pinholes, resulting in excellent sealing and strength.


Fourth Outstanding Advantages

High Efficiency and Speed: The welding process is typically completed within 0.1 to 1 second, significantly improving production efficiency and making it easy to integrate into automated production lines.

Clean and Environmentally Friendly

No Additives: No glue, solvents, or adhesives are used, eliminating the risk of chemical contamination of the contents and being more environmentally friendly.

Smoke and Dust-Free: The process is clean, making it suitable for industries requiring high cleanliness, such as food and medical devices.


High Seal Quality

High Seal Strength: The resulting seal area is strong, providing excellent leak and contamination resistance.

Aesthetics: The seal line is neat and fine, resulting in an attractive appearance. Various complex seal patterns can be achieved.

Low Gas Permeability: For foods requiring modified atmosphere packaging (MAP), this method effectively maintains the gas composition within the package.

Energy Saving: Energy is applied only to the seal area, resulting in very low overall energy consumption.

Easy to Automate: The entire process is program-controlled, and parameters (such as time, energy, and pressure) can be precisely set, ensuring consistent and traceable results.

Available as an anti-theft feature: For example, blister packaging, once opened, cannot be restored, effectively protecting the product.


V. Limitations and Considerations

Material Limitations: This method is primarily suitable for thermoplastics (such as PP, PE, PET, PVC, and nylon) and their composites. It is not suitable for thermoset plastics, metal, or glass.

Initial Investment Cost: The initial investment in equipment and custom welding heads is relatively high, making it more suitable for large-scale production.

Product and Tool Design: The welding head must be precisely designed to the product shape. Any modification may require re-manufacturing the welding head, increasing cost and time.

Sensitivity to Contents: If the product is a powder or liquid, vibration may cause it to splash and contaminate the sealing area, affecting seal quality and requiring specialized design processes.



Summary: Ultrasonic welding packaging technology is an advanced, efficient, clean, and reliable sealing solution. It is particularly suitable for high-speed automated production, applications requiring high cleanliness, and applications that require a strong and aesthetically pleasing seal. As the consumer goods and medical industries continue to demand higher packaging quality and production efficiency, the application of ultrasonic welding technology will continue to expand.





  





CATEGORIES

NAVIGATION

GET IN TOUCH

 Ms. Yvonne
  sales@xingultrasonic.com   
  +86 571 63481280

  +86 15658151051
   1st Building NO.608 Road ,FuYang, Hangzhou, Zhejiang,China

QR-CODE

© RPS-SONIC | Privacy Policy