Hot melt adhesive dispensing system including adhesive cut-off module

摘要

A hot melt adhesive dispensing system includes an adhesive cut-off module, which introduces a non-adhesive liquid medium to cut-off a hot melt adhesive stream without forming an angel hair. The adhesive cut-off module includes a spool valve assembly which is configured to move from an adhesive dispensing position to a liquid dispensing position to cut-off the hot melt adhesive stream.

主权项

1. A hot melt adhesive dispensing system, comprising:
a nozzle assembly including an adhesive cut-off module, wherein the adhesive cut-off module is configured to cut-off a hot melt adhesive stream free of an angel hair formation by dispensing a non-adhesive liquid; a hot melt adhesive delivery system configured to deliver a hot melt adhesive to the nozzle assembly; and a liquid delivery system configured to deliver the non-adhesive liquid to the nozzle assembly; wherein the adhesive cut-off module includes a spool valve assembly including an adhesive chamber and a liquid chamber, wherein the adhesive chamber and the liquid chamber are two separate chambers divided by a wall therebetween, the spool valve assembly having an adhesive dispensing position and a liquid dispensing position, wherein the nozzle assembly dispenses the hot melt adhesive stream from the adhesive chamber in the adhesive dispensing position, and dispenses the non-adhesive liquid from the liquid chamber in the liquid dispensing position, wherein the hot melt adhesive stream is cut-off when the position of the spool valve assembly is changed from the adhesive dispensing position to the liquid dispensing position.