top of page

Radio Frequence Welding

How RF Welding Works

Radiofrequency energy is directed through electrodes custom-built to the required shape usually through the use of a tool. This makes RF Sealing the most versatile of the polymer film sealing methods. RF sealing uses a precise combination of time, pressure, and RF waves to form a stronger, more uniform weld than is possible using other methods.

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 (fabrics like polyester, nylon…) for additional strength and versatility. Custom laminations may also be developed unique to your required application.

Essentially, RF Welding works through a five-step process:

  1. Loading Parts: Joint member is placed into the welding machine to undergo RF heat sealing.

  2. Pressure Application: Pressure is applied to the joint member through electrodes. Pressure describes force applied to an area and in this case a fixed electrode at the bottom requires an actuator to drive the upper electrode downwards with the prescribed force.

  3. Electrical Field Application: At this point, an electrical field is applied for a designated amount of time while pressure is maintained throughout the process.

  4. Holding Pressure: As pressure is continually applied along with the electrical field, the portions of the joint member directly in contact with the equipment will melt and the liquid polymers will diffuse into each other at the respective points of contact.

  5. Unloading Parts/Cooling: This process engages through a chemical process of diffusion and solidification to “weld” the members together. At this point, after the joint cools down, the upper electrode is now brought back and parts are unloaded.

In other words, dielectric 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 built 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.

What You Get with FODI

  •  On-Time Delivery
    We have a 99.8% rate of delivering products on time. FODI is a reliable supply chain partner that understands the critical need of delivering quality products accurately, reliably, and on-time.

  •  Experience
    Vinyl Technology Inc. is the leading manufacturer for RF welded film and sewn textile products and has been around for 40 years. Our products are used for critical applications by hospitals and medical facilities, aerospace organizations such as NASA, and government and defense contractors. If you are an industrial corporation looking for a high-performance solution with a reliable partner, then we may be a good fit for you.

  •  High Quality, Best Value
    With a top RF heat-sealing company like FODI, you’re getting only exactly what you pay for. Because we produce only what you designed, there isn’t a single weld out of spec or unexpected. That translates to a lower cost per unit than something you’d typically buy off the shelf. FODI is ISO 9100:2015, AS9100D Certified and Berry Compliant (when requested).

  •  High Volume, Quick Production
    Our experienced engineering team can work with you on taking your blueprints from conception stage to production. Our manufacturing facilities are designed for high-volume production runs to help you scale your costs. If you are interested in starting a project, contact us today.

bottom of page