Radio Frequency welding also known as heat sealing has been around since the 1940s . It is a very mature technology that like cooking depends on the skill of the chef as much as the quality of the equipment and materials. Radio frequency welding uses a press that applies pressure to both surface areas. The press has a table with that the material is placed on. Dies are used to direct the welding process. When the press comes together, high frequency waves (usually 27.12 MHz) are passed through the small area between the die and the table where the weld takes place. This high frequency (radio frequency) field causes the molecules in certain materials to move and get hot, and the combination of this heat under pressure causes the weld to take the shape of the die.
RF welding is fast. This type of welding is used to connect polymer films used in a variety of industries where a strong consistent leak-proof seal is required. In the Industrial Fabrics Industry, RF is most often used to fuse/weld vinyl (PVC) and polyurethane(PU) coated fabrics. This is a very consistent method of welding.
