The thermal bond unit consists of two heated rolls. Typically, one roll is patterned and the other is smooth. Air cylinders may be used to apply minimal pressure between the anvil and the pattern roll.
The ultrasonic bond unit consists of an anvil roll and stationary (or rotary) ultrasonic assemblies. The ultrasonic assembly bonds multiple layers of the product together by use of vibration and pressure. The product web wraps the patterned anvil roll as it passes under the head of each ultrasonic unit. Bonding takes place when the head and anvil compress the product web.
Hot-Melt Adhesive Bonding
Hot-melt glue is loaded into a heated tank. The glue is melted and pumped to an applicator head. In many cases, the glue head is allowed to contact the web during the glue application. The glue applicator may include electronics to apply the glue in a preset pattern.
The mechanical bonding unit consists of two rolls. Usually, one roll is patterned and the other is smooth. Air cylinders, or other methods, may be used to apply the required bonding pressure between the anvil and the pattern roll.