Radio Frequency (RF) Sealing
Radio Frequency (RF) sealing, also known as dielectric sealing and RF welding, is a method of bonding through the conversion of electromagnetic energy into heat. RF sealing joins bipolar thermoplastic film or sheet material using heat produced by radio frequency energy. The amount of heat applied to the material is proportional to the RF power output of the generator. A pneumatic press applies pressure while pre-seal, seal, and cool time is controlled by electric timers.
RF sealing machines (RF sealers) use the latest programmable logic controls (PLC) to ensure a strong seal every time. Some equipment uses load following technology to automatically adjust the machine's output when material variation would normally cause an inadequate seal or an over-weld.
RF sealers are used to bond a variety of plastics. The most common material used in RF Sealing is PVC (PolyVinyl Chloride), but also used are Urethane, Olefin, PETG (Polyethylene Terephthalate), some types of Nylon, some types of Styrene, and Polyolefins with EVA (Ethyl-Vinyl Acetate). An RF Sealer operates similarly to a standard kitchen microwave oven. When the RF is applied it excites or agitates the polarized molecules in the plastic causing heat. When pressure is applied to the plastic the molecules of the two layers flow together. The resulting bond is usually stronger than the individual layers of material. RF Welders and Sealers usually operate at 27.12MHz.
RF Heat Sealing is a technology with very wide applications. The Packaging Industry uses RF sealing to bond ClamShell and Blister Packages. The Medical industry use RF Sealers to make Blood Bags, IV Bags, Pressure Cuffs and many other similar products. In the Automotive Industry RF sealers are used to make Roll-out Luggage Compartment Covers and to RF weld the vinyl "Toe" and "Heel" pads found at the feet of the Automobile Carpet. RF sealing is also used in many industrial applications to make items such as vinyl construction road signs.
Some other common applications are:
- Loose-leaf Binders
- Seat Cushions
- Dust Filters
- Pocket protectors
- Automobile tops, doors, and sun visors
- Intravenous Bags
- Tarps, Tents and Awnings
- All sorts of packaging
- Sheet Protectors
- Shower Curtains
- Inflatable Rafts
- Blow-up Toys
Sealing equipment selection includes:
- Front Loads
- Seal & Cut
- Impulse Sealing Machines
- Ultrasonic Sealing Machines
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