Radio frequency welding (RF welding), also known as high frequency welding or dielectric welding, is the process of bonding two materials together with the use of electromagnetic energy that creates a bond that is impenetrable and resistant to tearing. During this process, two electrodes create an oscillating electric field between the two materials that shift and move the polar molecules found within the materials. These molecules will move and orient themselves in accordance with the electromagnetic field. As a result, these molecules produce heat, which will eventually cause them to melt and bond with each other. During the process, no external heat is applied. To complete the process, and create durable product packaging, pressure is applied to the newly bonded area.
What Goes into Ensuring a Good Bond?
When determining what materials should be used to create a strong bond, factors such as tooling layout, weld thickness, material thickness and machine control should all be considered. While some materials may be more difficult to RF weld than other types of materials, or require a special process, SouthPack can confidently and expertly create a durable seal that will be strong and hold up.
Why Choose RF Welding?
There are alternative methods that will achieve similar results to that of RF welding, including sewing, gluing, or hot air. So, why should you choose RF welding over the other sealing methods?
- RF Welding vs. Sewing: Unlike sewing, RF welding creates an air tight seal that can’t break. When seams experience stress, the thread in sewn seams takes the pressure and eventually could break. RF seams evenly distribute the stress and pressure throughout the entire material, therefore, creating a stronger seam, without allowing for air, moisture, or debris to reach the product inside.
- RF welding vs. Gluing: Similar to RF welding, gluing does produce an air tight packaging solution, but is a much longer process. Often times gluing also involves hazardous solvents that can be harmful to the environment. Once the adhesive in the glue has worn out, glued seams often tend to fail.
- RF Welding vs. Hot Air: Similar to that of RF welding, hot air uses heat to create a seal on the product packaging. The hot air method is only effective up to a certain thickness of materials before it is no longer effective. This is because the hot air method heats the material from the outside in. As a result, thicker materials will not be able to fully melt and bond in the middle, as the outer layers are overheated or burned trying to achieve an air tight seal. RF welding heats the materials from the inside out, eliminating the risk of burning the material or not achieving an airtight seal.
SouthPack uses RF welding technology to create durable, air tight seals on various packaging needs. Contact SouthPack (860-224-2242) today to learn how RF welding can be used to create the packaging that you need for your products.