Hall Dielectric Machinery Co.

Hall Dielectric is a leading manufacturer of RF Heat Sealing equipment and automation systems.  The company was founded in 1973 by William F. Hall and sons in Long Island, NY.  In 1991, Hall Dielectric re-located to Rock Hill, South Carolina and became the only RF equipment manufacturer to serve the rapidly expanding market in the Southeast. We offer close to 40 years of experience in designing, manufacturing, servicing, sales and RF applications engineering for the heat-sealing industry.  

We also build feeders, indexers, turntables and automation systems to work with your sealers. If we don't have a standard sealer for your application we can design a machine giving you an advantage over your competitors. Hall Dielectric takes pride in offering "custom" equipment to our customers.  We have experienced machinists and toolmakers to custom build your tools and sealing dies using cnc lathes, milling machines and three axis-milling machines.

High Frequency Welding Equipment

Radio Frequency Heat Sealing

Radio Frequency (RF) Heat Sealing or High Frequency (HF) Welding Equipment uses radio-waves typically at 27.12 MHz - directed through two or more layers of a dielectric plastic in conjunction with pressure so that the molecules of all layers of the plastic combine when the material becomes molten.

The changing polarity of the radio waves being passed through the plastic causes polarized molecules in the polmer to vibrate back and forth, inducing friction at the molecular level and producing heat. This heat, when created with sufficient energy, causes the plastic to become molten and under pressure the layers seal together by free exchange of molecules.  The RF Energy is then shut off while the tooling holds the plastic sheets together for a very short time to cool under pressure.  The result is a seal with equal or greater strength than the material itself.

Industrial Heat Sealing

Industrial Heat Sealing is a technology with very wide applications.  Some common ones are: Loose-Leaf Binders, Dust Filters, Bladders in Footballs, Pocket Protectors, Blow-up Toys, Inflatable Rafts, Intravenous Bags, Tarps, Tents, Awnings, All sorts of Packaging, Sheet Protectors, Shower Curtains, Automobile tops, Automobile Doors, Automobile Sun Visors & Carpets, Seat Cushions, Medical Products, Pool Liners, Canvas, Automotive Products.  When you need to fabricate an item from two or more pieces of plastic, you need a way of welding them together.  When welding sheet materials together in an overlapping fashion, the preferred method is RF Heat Sealing.

Plastic Medical Bags

Plastic Medical Bags are typically processed via radio-frequency sealing.  In the medical industry, RF energy is used to seal together two or more layers of film - typically PVC, EVA, Saran, or polyurethane - to form a container or pressure device.  Bags for IV fluids, chemotherapy, blood, enternal feeding, ostomy and urology, laparoscopy, enema, ileostomy, and fluid filtering are all made with RF sealing.

In addition, the process is used to produce blood-pressure cuffs, hot and cold packs, leg-compression sleeves, aircasts, body bags, wheelchair pads, immobilizing pillows, breather bags, implants, IV arm boards, stretchers, centrifuge devices, sterilization indicators, tourniquets, catheters, and fluid-pump cassettes, among other disposable devices.  Although these products are extensive and varied, the technique for sealing them is essentially the same.

Clamshell Machines

Within the past 10 years, the preferred method of producing a clamshell or blister package has become utilitzing RF Heat Sealing.  RF Heat Sealing these packages excites the plastic molecules, like a microwave oven would excite the water molecules in your food to warm it up.  For very strong seals and to protect the items or products inside your clamshell or blister package, use RF Heat Sealing equipment to insure the durability of your packaged products.  Hall Dielectric offers durable clamshell machines and dependable machinery for your packaging product needs.