Edge Sealing Technology: How It Prevents Fiber Shedding and Dusting

In the manufacturing of sanitary products, the edge sealing process often goes unnoticed by the end user — unless it fails. When edges fray, fibers loosen, or powder dusts out, the consumer's perception of quality immediately drops. Edge sealing technology is the solution to these issues, preventing fiber shedding, dusting, and premature separation of layers. Three primary edge sealing methods dominate the industry: ultrasonic bonding, heat sealing, and adhesive bonding. Each has unique characteristics that affect the product's appearance, durability, and cost.

Ultrasonic Bonding: Friction Fusion for Clean Edges

Ultrasonic bonding uses high-frequency mechanical vibrations (typically 20–40 kHz) to generate heat through friction at the contact points between nonwoven layers. The localized heat melts the polymer fibers, fusing them together without the need for adhesives or external heat sources. This method creates a clean, precise, and nearly invisible seam.

• How it works: The material passes between a vibrating horn and an anvil. The ultrasonic energy is focused along a narrow path, melting the fibers instantly.

• Edge quality: Excellent. Produces a smooth, sealed edge with no loose fibers. The seam is flexible and does not stiffen the product.

• Fiber shedding: Minimal to zero. The fused edge locks all fibers in place.

• Dusting: Virtually eliminated.

• Applications: Premium diapers, high-end sanitary napkins, and nonwoven wipes.