Ultrasonic sealing uses high frequency vibrations and pressure to join materials with a molecular bond, without requiring heat or hazardous materials. It can be used on plastic or metal, and is cost-effective and reliable. It is suitable for temperature-sensitive food products and pharmaceuticals. The process eliminates the need for additional components, simplifying manufacturing and reducing costs.
Ultrasonic sealing is the use of mechanical vibrations to join materials with a molecular bond. Electricity is converted into a high frequency acoustic signal which is combined with pressure on the pieces being joined to produce a seal as strong or stronger than the materials themselves. Can be used on plastic only or a combination of plastic and metal. A computer controls sealing time and other adjustments to allow for accurate handling of multiple materials and types of seals. The process is cost-effective and potentially safer than other methods because it generally doesn’t require heat or hazardous materials such as solvents or adhesives.
A converter expands and contracts at the same frequency as an electrical source to transform electrical energy into mechanical energy in the form of specific ultrasonic frequency vibrations. Ultrasound refers to frequencies outside the range of human hearing, i.e., above 20,000 hertz. The vibrations are amplified and directed into the materials to be sealed. The pieces are pressed together and vibrations force the parts together until they bond at a molecular level.
Common applications of ultrasonic sealing include joining thermoplastic resins such as polyethylene or polystyrene. Metal and plastic can also be joined using this method. Gaskets can be as simple as stacked layers or can glue an insert into a base or stake a post perpendicular to the base. Ultrasonic seals are found on blister and clamshell packages. Filled pipes can be closed with this technology. The strength of the seal can make this process suitable for tamper-evident packaging as well.
Microprocessor controlled ultrasonic sealing machines can produce consistent and reliable seals with minimal labor requirements. Fully automated machinery requires only limited training without impacting speed or quality. Microprocessor setting adjustment allows for quick changes to sealing specifications such as frequency, size and source material.
The ability to seal without applied heat makes ultrasonic sealing particularly suitable for temperature sensitive food products. It is also used in pharmaceutical facilities. The closure can also be effective in case of contamination of the sealing area by the food product.
In most applications, no heat is required for the process, eliminating the cost of heat generation. Most processes do not require any adhesive, thread or solvent to ensure a good seal. The elimination of additional components in the assembly line simplifies the manufacturing process and reduces production and inventory costs.
Protect your devices with Threat Protection by NordVPN
