Liquid material application method and device for implementing said method

An application method of performing linear application onto an application target using an application device, the application device comprising:

• a discharge device that is of j et type;
• and
• a relative driving device configured to move the discharge device and the application target relative to each other,
• the discharge device comprising:
• a nozzle having a plurality of discharge ports;
• a liquid chamber communicating with the plurality of discharge ports via a plurality of discharge flow paths;
• and
• a plunger rod that reciprocates in the liquid chamber and is narrower than the liquid chamber,
• wherein the nozzle communicates with the liquid chamber and has a truncated-cone-shaped inner space into which the plunger rod proceeds, the truncated-cone-shaped inner space being surrounded and defined by an upper inside surface of a side wall of the nozzle, a tapered surface of the nozzle that narrows downward from the upper inside surface, and an inner bottom surface located at a lower end of the tapered surface,
• wherein the inner bottom surface is constituted by a plane perpendicular to an axis of the plunger,
• wherein the plurality of discharge flow paths comprises respective inclined inflow ports continuous with the tapered surface of the nozzle and each of the inflow ports is inclined downward toward the center of the nozzle,
• wherein the plurality of discharge ports is arranged on a straight nozzle arrangement line, and arranged with such a distance therebetween that globs of a liquid material having landed on the application target join together to form an application line,
• the method includes forming an application line perpendicular to the nozzle arrangement line by, while moving the discharge device and the application target relative to each other in a direction perpendicular to the nozzle arrangement line, successively discharging the liquid material such that a plurality of liquid globs having been discharged from the plurality of discharge ports have no contact with each other before landing on the application target, and letting the globs of the liquid material having landed join together on the application target,
• the application target has a step portion, and
• the method includes facing a discharge port having a first opening area toward an upper step of the step portion and a discharge port having a second opening area toward a lower step of the step portion to form the application line.

An application device comprising:

• a discharge device that is of j et type;
• and
• a relative driving device configured to move the discharge device and an application target relative to each other,
• the discharge device comprising:
• a nozzle having a plurality of discharge ports;
• a liquid chamber communicating with the plurality of discharge ports via a plurality of discharge flow paths;
• a plunger rod that reciprocates in the liquid chamber and is narrower than the liquid chamber;
• and
• a liquid contact member comprising a cylinder portion in which the liquid chamber is formed,
• wherein the nozzle communicates with the liquid chamber and has a truncated-cone-shaped inner space into which the plunger rod proceeds, the truncated-cone-shaped inner space being surrounded and defined by an upper inside surface of a side wall of the nozzle, a tapered surface of the nozzle that narrows downward from the upper inside surface, and an inner bottom surface located at a lower end of the tapered surface,
• wherein the inner bottom surface is constituted by a plane perpendicular to an axis of the plunger,
• wherein the plurality of discharge flow paths comprises respective inclined inflow ports continuous with the tapered surface of the nozzle and each of the inflow ports is inclined downward toward the center of the nozzle,
• wherein the plurality of discharge ports is arranged on a straight nozzle arrangement line, and arranged with such a distance therebetween that globs of a liquid material having landed on the application target join together to form an application line,
• the nozzle is detachably attached to a lower end of the cylinder portion to be positioned at a first position where the nozzle arrangement line has a first angle with respect to a line perpendicular to the plunger rod, or at a second position where the nozzle arrangement line is set at 90 degrees with respect to the first angle, and
• the application device is capable of executing
• first application, in a state where the nozzle is attached at the first position, to form an application line perpendicular to the nozzle arrangement line by, while moving the discharge device and the application target relative to each other in a direction perpendicular to the nozzle arrangement line, successively discharging the liquid material such that a plurality of liquid globs having been discharged from the plurality of discharge ports have no contact with each other before landing on the application target, and letting the globs of the liquid material having landed join together on the application target, and
• second application, in a state where the nozzle is attached at the second position, to form an application line in a same direction as the nozzle arrangement line by, while moving the discharge device and the application target relative to each other in the same direction as the nozzle arrangement line, successively discharging the liquid material such that a plurality of liquid globs having been discharged from the plurality of discharge ports have no contact with each other before landing on the application target, and letting the globs of the liquid material having landed join together on the application target.