초록 ▼

A spray head attachment adapted for use with a flow metering device such as a metering gear head is effective to discharge a plurality of spiral spray patterns of hot melt adhesive, in elongated strands or fibers, onto the backing sheet of a hygienic article. The spray head attachment includes a man

A spray head attachment adapted for use with a flow metering device such as a metering gear head is effective to discharge a plurality of spiral spray patterns of hot melt adhesive, in elongated strands or fibers, onto the backing sheet of a hygienic article. The spray head attachment includes a manifold having adhesive passageways connected to outlets of the metering gear head, air passageways connected to a source of pressurized air and recirculation passageways connected to a source of hot melt adhesive. Outlets of the adhesive and air passageways, and inlets of the recirculation passageways, are formed on a discharge surface of the manifold in groups or arrays, so that nozzles mounted to the manifold are each connected to one array of adhesive, air and recirculation passageways. Each nozzle is effective to discharge an adhesive bead and then impact the bead with jets of air directed tangentially relative to its periphery to form elongated adhesive strands or fibers and to impart a twisting motion to the fibers for deposition in a compact, spiral spray pattern onto the backing sheet of the hygienic article.

대표청구항 ▼

Apparatus for spraying hot melt adhesive onto the backing sheet of a hygienic article, comprising: a flow metering device having means for discharging a separately metered quantity of hot melt adhesive through each of a plurality of outlets; a manifold mounted to said flow metering device, said mani

Apparatus for spraying hot melt adhesive onto the backing sheet of a hygienic article, comprising: a flow metering device having means for discharging a separately metered quantity of hot melt adhesive through each of a plurality of outlets; a manifold mounted to said flow metering device, said manifold being formed with adhesive connector passageways each having an inlet communicating with one of said outlets of said flow metering device and an outlet formed on a discharge surface of said manifold, said manifold being formed with air connector passageways each having an inlet adapted to connect to a source of pressurized air and an outlet formed on said discharge surface of said manifold, said outlets of said adhesive connector passageways and said outlets of said air connector passageways being arranged in arrays on said discharge surface of said manifold each consisting of an outlet of one adhesive connector passageway and an outlet of one air connector passageway; a nozzle mounted to said discharge surface of said manifold over one of said arrays of an adhesive connector passageway outlet and an air connector passageway outlet, said nozzle being formed with an adhesive discharge passageway connected to said outlet of said adhesive connector passageway and an air discharge passageway connected to said outlet of said air connector passageway; a nozzle attachment mounted to said nozzle, said nozzle attachment being formed with a throughbore connected to said adhesive discharge passageway of said nozzle for discharging a bead of adhesive, said nozzle attachment being formed with air jet bores connected to said air discharge passageway of said nozzle for directing pressurized air substantially tangent to the outer periphery of said bead of adhesive to form elongated adhesive fibers and to impart a twisting motion to said elongated adhesive fibers for deposition in a spiral spray pattern on the backing sheet of a hygienic article.