Fabric welding equipment uses the application of heat, pressure, or ultrasonic energy to join fabrics or plastics, which is a modern-day substitute for sewing. Ultrasonic welding works best for synthetic materials as it produces waterproof, sealed seams, while other types of welding are better for PVC and EVA. This type of equipment is used to manufacture shower curtains, outdoor awnings, and inflatable textiles where strong airtight bonds are a necessity. Most modern systems incorporate automation, such as conveyor belts or robotic arms, to increase efficiency during mass production.