Nozzle unit, liquid dispenser comprising such a nozzle unit, and methods for producing such nozzle units

A method for producing a nozzle unit for a liquid dispenser, having the following features:

• a. the method is used to produce a nozzle unit with a plastic carrier, which is traversed by a nozzle channel from an inlet side to an outlet side, and with a nozzle plate arrangement, which has a multiplicity of nozzle openings and is inserted into this nozzle channel, and
• b. the method is carried out using an assembly tool,
• c. the assembly tool has an outer contour with an oversize in relation to the nozzle channel, such that the assembly tool, by being inserted into the nozzle channel and by applying force there to a nozzle channel wall, can elastically expand the nozzle channel, and
• d. the assembly tool has an end face which is larger than an outer contour of the nozzle plate arrangement, and
• e. the method comprises the following method steps:
• the plastic carrier is brought into a defined assembly position, and
• the nozzle plate arrangement and then the assembly tool are inserted in a joining direction into the nozzle channel from the inlet side, and
• with progressive insertion of the assembly tool into the nozzle channel in the joining direction, the nozzle channel is partially expanded elastically by the assembly tool, such that the nozzle plate arrangement is brought to an elastically expanded end position, and
• the assembly tool is pulled out of the nozzle channel counter to the joining direction, wherein the nozzle plate arrangement remains in the end position and, after complete removal of the assembly tool, is held by the nozzle channel wall as a result of the elastic resetting of the nozzle channel.