SEAM WELDING – What does “radio-frequency welded” mean?
The double-vinyl coated polyester fabric used to manufacture the RoofBag carrier is heat-welded at the joints, using an advanced process called radio-frequency electrical welding. This process joins layers of fabric without stitching. Radio-frequency welding is the most advanced technique for welding vinyl-coated polyester fabric, and it consistently produces joints that are fully waterproof and stronger than the fabric itself. Radio-frequency welding uses sophisticated equipment that first holds the pieces to be joined with a pre-determined amount of pressure, then applies a precisely measured electrical current to the area being welded. The electrical current applied is of very high frequency, similar the frequencies used for radio communications. This type of electrical current selectively softens the vinyl coating of the fabric to cause permanent adhesion of adjoining layers of fabric. In contrast with other heat-welding methods, such as hot-air welding, the radio-frequency welding
