What is Dielectric Sealing?
Dielectric Sealing (a.k.a. RF Sealing, RF Welding, Heat Sealing) is the process of joining thermoplastic films using Radio Frequency (RF) energy to excite the molecules of the materials to be joined from the inside out, fusing the materials together. The RF energy is directed through electrodes (dies) custom designed to the required shape of the seal or weld. This makes RF Sealing the most versatile of the polymer film sealing methods. It is different than your ordinary kitchen bag sealer in that it does not simply use heat and pressure to melt and join materials. RF sealing uses a precise combination of time, pressure, and RF energy to form a stronger more uniform weld across the seal.
Not all polymers can be dielectrically sealed. Acceptable materials include vinyl (PVC), ether and ester-based polyurethanes (PU), and chlorinated polyethylene (CPE). These materials are often coated or laminated onto substrates for additional strength and versatility. Custom laminations may also be developed as only the outer laminate must exhibit the properties required for dielectric sealing.
Also known as:
Radio Frequency Heat Sealing/Welding