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Dielectric Sealing

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Dielectric Sealing

Dielectric Sealing
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Dielectric Sealing

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:
Dielectric Sealing/Welding
Radio Frequency Heat Sealing/Welding
RF Sealing/Welding
Heat Sealing

Materials

What materials are typically used in dielectric sealing?
Acceptable materials include vinyls, ether or ester-based urethanes and chlorinated polyethylene. These materials are often coated or laminated onto substrates for additional strength and versatility. Dielectric sealing is one of the most versatile of the polymer film sealing methods.

Commonly Used Materials:
  • PVC/Vinyl 
  • Polyethylene
  • Polyurethane
  • CPE
  • EVA
  • TPU

VTI Advantages

short lead times
Short lead times for development prototypes or production
Low quantity minimums
Low quantity minimums
High Reliability
High Reliability
Dielectric Sealing

Our Equipment

VTI currently has more than 40 RF machines and continues to add more, uniquely positioning VTI to meet the capacity and capability requirements of its most demanding customers. Models include standard platen machines, bar welders, dual cycle machines, and proprietary equipment with up to 48" x 96" seal area. High volume projects utilize shuttle and turntable configurations. Machines range in output from 4 to 50 KW

  • Kabar
  • Hall Dielectric Machinery
  • Faratron
  • Proprietary VTI
  • Thermatron
  • Fara-Dyne
  • COSMOS

Want to Learn More?

Call Us Today 626.443.5257