초록 ▼

A method and apparatus for dispensing multiple, closely spaced beads of viscous liquids such as hot melt thermoplastic adhesive is provided which comprises a dispensing device including a nozzle assembly having a nozzle body connected to a nozzle plate carrying a number of closely spaced nozzle tips

A method and apparatus for dispensing multiple, closely spaced beads of viscous liquids such as hot melt thermoplastic adhesive is provided which comprises a dispensing device including a nozzle assembly having a nozzle body connected to a nozzle plate carrying a number of closely spaced nozzle tips. The nozzle body is formed with an internal adhesive flow passage terminating with an elongated distribution channel having an outlet. A number of comparatively small diameter discharge passageways are formed in the nozzle plate, each connected to one nozzle tip, and structure is provided for transferring the adhesive from the elongated distribution channel in the nozzle body into each of the discharge passageways, against the influence of gravity, for discharge from the nozzle tips as individual extruded beads.

대표청구항 ▼

The method of discharging a number of extruded beads of thermoplastic material, comprising: transmitting thermoplastic material from a dispenser outlet to a fluid path in a nozzle via operation of a movable valve means which is movable with respect to the dispenser outlet between an open position fo

The method of discharging a number of extruded beads of thermoplastic material, comprising: transmitting thermoplastic material from a dispenser outlet to a fluid path in a nozzle via operation of a movable valve means which is movable with respect to the dispenser outlet between an open position for permitting discharge of the material and a closed position for preventing such discharge, the fluid path located downstream of the movable valve means and including a distribution passage and a plurality of discharge passageways having inlet and outlet portions; directing the thermoplastic material vertically upwardly from the distribution passage, against the influence of gravity, into the inlet portions of the plurality of discharge passageways; transmitting the thermoplastic material through the discharge passageways at a higher velocity than the velocity at which the thermoplastic material is transmitted through the distribution passage; extruding a bead of thermoplastic material from the outlet portions of each of the discharge passageways, whereby thermoplastic material is retained in the distribution passage and in the discharge passageways of the fluid path after the movable valve means closes the dispenser outlet, the distribution passage and the discharge passageways remaining in fluid communication during extrusion when the dispenser outlet is open and after extrusion when the dispenser outlet is closed.