Bar welders are used to seal long seams for tarps and liners made of materials such as PVC mesh, vinyl or other polyethylene materials. A hot bar welding process is typically used to enjoin the thermoplastic films that comprise these products. This process employs the principle of pressing two thermoplastic films against a heated bar (or bars) to soften them and create a seal.
Depending on the bar welding process, one or two metal bars may be used to form the seal. When two bars are used, they’re deployed on either side of the films. One of the bars is hinged to facilitate the placement and removal of the thermoplastic films.
RF Bar Welding
A popular type of bar welding technique uses radio frequency bar welders. An RF bar welder employs the same basic principles found in a common microwave oven. The RF bar welding machine generates radio waves that create heat inside the fabric via molecular action. The molecules that comprise the plastic are essentially flipped from a positive to negative electrical charge at a rate of several thousand times per second. This process generates friction from inside the fabric that is transmitted to the outside. The combination of the heat produced by the friction and the pressure generated by the bar dies creates a seal that bonds the plastic layers together.
RF bar welding is often used to produce truck tarp seams. The bar seal welds the tarp’s fabric panels together in much the same fashion as a sewn seam.
Benefits of Radio Frequency Bar Welders
An RF bar welder does not produce smoke during the sealing process, making it an environmentally friendly option for any manufacturing operation. Most of the thermoplastic materials used to produce tarps and liners offer good resistance to the RF heating technology, making the process safe and minimizing the possibility of damage. A coating of polytetrafluoroethylene (PTFE) can also be applied to bar surfaces to prevent adherence of the plastic. Overall, RF sealing produces the best quality in terms of bonding and appearance of the fabric.
MarkPeri Can Meet Your Bar Welding Equipment Requirements
MarkPeri has been providing reliable, cost-effective RF welding solutions since 1982. Our many years of relevant application experience and unsurpassed market knowledge enables us to offer the ideal RF welding machine and equipment for your needs.
We offer sizes from 36” to 72” wide Bar lengths. We can offer them in 6kw to 20kw for sealing wider widths. These units are designed with the smallest footprint due to having our generator under the machine. We can offer custom mounting of start buttons and an attachment for punching out grommets prior to welding.
Used/Refurbished Radio Frequency Bar Welders Also Available
If you’re looking for a great value on an RF bar welder, consider purchasing a used or rebuilt machine from MarkPeri. We specialize in rebuilding all types of RF machines, which we then offer for sale at extremely affordable prices. We refurbish bar welding equipment to like-new equipment, ensuring it will serve you well for a long time to come. We also provide reliable repair service to keep your RF bar welding machine on the job and minimize unproductive downtime.
Contact Us for More Information Regarding Our Bar Welding Equipment
Whether a brand-new or used/refurbished RF bar welder best meets your needs and budget, you can count on the experts at MarkPeri to help you choose the right machine for the job. Contact us to learn more about our top-quality bar welding equipment today.