| 摘要 |
In one aspect, an adhesive dispensing system includes a dispensing module having an inlet and an outlet, a supply of hot melt adhesive maintained at low pressure, and a low pressure liquid passageway communicating between the supply and the inlet of the dispensing module. Liquid material is received through the inlet at a low pressure, and the dispensing module rapidly develops high pressure at the outlet to jet the liquid material from the outlet. In another aspect, an apparatus for jetting liquid material includes a dispenser body having a liquid chamber. A piston is movably disposed within the liquid chamber, from a position wherein a piston tip is spaced from a complimentary shaped recess, to a position wherein the piston tip effectively seals off the recess, then to a position wherein the piston tip is received within the recess to displace a discrete volume of liquid material from the recess. |
