Jetting dispenser and method of jetting highly cohesive adhesives

摘要

Jetting dispensers and methods of non-contact dispensing a hot melt adhesive onto a substrate (12). The method may include jetting a plurality of droplets (120) of the hot melt adhesive from a nozzle (66b) outlet toward the substrate (12) in a direction of travel (121). each droplet (120) has a droplet (120) length approximately aligned with the direction of travel (121) and a droplet (120) width shorter than the droplet (120) length. The jetting is controlled such that each of the droplets (120) does not collapse into a spherical-shaped droplet (120) during flight from the nozzle outlet (82) to the substrate (12). The nozzle outlet (82) may be heated to a first temperature, and the method may further include rapidly heating each droplet (120) of the hot melt adhesive to a second temperature higher than the first temperature upon release from the nozzle outlet (82).