Abstract: A machine for applying a heat meltable composition includes a drive module, a light source module, and a nozzle module. The drive module attaches to the end of an elongate arm for moving the material with respect to the nozzle. The light module includes a laser for irradiating the composition as it passes through the nozzle and is applied to the material. The nozzle includes a mechanism for withdrawing the composition after flow is terminated to prevent the formation of strings in the composition. The modules are controlled by a process that provides a sequence of steps upon receipt of control signals from an operator foot pedal.

Abstract: A nozzle for application of an extrudable material to a substrate optically couples an electromagnetic beam to the extrudable material. The nozzle forms a flow channel with a window at one end. The extrudable material is admitted to the flow channel such that it flows across the bottom surface of the window and through the flow channel. The nozzle is removably held in a head to permit replacement of the nozzle when worn or for installation of a nozzle having different characteristics for a different application.