JPH06254463A - Liquid material spraying apparatus - Google Patents

Abstract

PURPOSE:To spray a liquid material in a constant quantity constantly and independently of ambient temperature. CONSTITUTION:In an apparatus to spray a liquid material in a container 1 to outside through the tip of a nozzle part 2 by operation of a cylinder structure (not shown) wherein a nozzle receptor 13 is installed in the outer circumference of the nozzle part 2 installed at the tip part of the container 1 of a dispenser A, a first temperature adjusting means C is formed wherein the means consists of the nozzle receptor 13 and a communicated hole (water pipe) 9 composed of an open part, a fine hole part, a groove part (grooved in the half- circumference of the outer surface of a pipe 2b), a fine hole part, and an open part all of which are communicated successively with one another. The temperature of the liquid material (e.g. resin in molten state) can be controlled to the time just before the material is sprayed by supplying a liquid for temperature control to the communicated hole 9 from a supplying pipe 10a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid material discharge device used for coating resin and the like.

[0002]

2. Description of the Related Art A liquid material ejecting apparatus which has been conventionally used for applying resin is set so that a constant amount of liquid material is always ejected at a constant temperature in one ejection process. However, the viscosity of the liquid material changes according to the temperature change of the outside air, which may change the discharge amount per time.

Therefore, there is a liquid material discharge device in which temperature control means is provided on the outer periphery of the container portion of the dispenser to keep the temperature of the liquid material in the container constant. In addition, for example, when the liquid material is discharged onto the substrate, a hot plate for heating the substrate is provided to keep the liquid material on the substrate constant, and the substrate is placed on the hot plate. There is a device that discharges a liquid material.

[0004]

When a temperature adjusting means is provided on the outer circumference of the container part of the dispenser, the liquid substance in the container part is kept in a constant state (viscosity), but is supplied from the container part to the nozzle part. When the liquid is actually discharged, the temperature of the liquid is not controlled, and the viscosity of the liquid changes in the nozzle part and the rate of adhesion to the inner wall of the nozzle part fluctuates. Discharge characteristics cannot be obtained. When a hot plate for mounting the substrate is provided, the heat of the hot plate is transferred to the liquid substance in the nozzle portion, the viscosity may change, and the discharge amount may change.

As described above, since the temperature of the nozzle portion of the dispenser for actually discharging the liquid material is not adjusted, it is difficult to always stably and equally discharge the liquid material.

Therefore, an object of the present invention is to provide a liquid material ejecting apparatus which can maintain a constant temperature of the liquid material at the time of ejection and stably eject an equal amount.

[0007]

In order to achieve the above object, a liquid material discharge device of the present invention includes a container portion for containing the liquid material and a nozzle portion for communicating with the container portion and discharging the liquid material. It has a dispenser and a first temperature adjusting means provided on the outer peripheral portion of the nozzle portion.

The first temperature adjusting means is composed of a nozzle receiver located near the outer periphery of the nozzle portion, and a communication hole provided in the nozzle receiver and through which a temperature adjusting fluid is passed.

Further, a second temperature adjusting means is provided on the outer circumference of the container portion.

[0010]

1 to 4 show an embodiment of a liquid material discharge device according to the present invention. This liquid material discharge device has a dispenser A, a second temperature adjusting means B, a first temperature adjusting means C, and an air jetting means D. A side view thereof is shown in FIG. 1 and a sectional view thereof is shown in FIG. Shows. The dispenser A is a hollow cylindrical container portion 1 in which a liquid substance is stored.
And a small-diameter nozzle portion 2 provided at the tip of the container portion 1 and communicating with each other. A cylinder mechanism (not shown) allows liquid material (molten resin) in the container portion 1 to pass through the nozzle portion 2. It is discharged to the outside. In this embodiment, the nozzle portion 2 has a needle 2a through which a liquid substance flows.
And a pipe 2b located on the outer circumference of the needle 2a. It should be noted that the amount of liquid material discharged by one-time driving of the cylinder mechanism is set to be always constant under a constant temperature.

A second temperature adjusting means B is provided so as to surround the outer circumference of the dispenser A. Explaining the configuration of the second temperature adjusting means B, the inner cylindrical body 3 and the outer cylindrical body 4 are fixed to each other by bolts 5 in a state of being in close contact with each other. A spiral groove is engraved on the outer peripheral surface of the inner cylindrical body 3 (a surface facing the outer cylindrical body 4), and the spiral water pipe 6 is joined to the inner peripheral surface of the outer cylindrical body 4.
Are formed. The spiral water pipe 6 is formed so as to meander from the upper part of the second temperature adjusting means B toward the lower part and then to the upper part again, and a pair of open ends near the upper end of the second temperature adjusting part B. 6a and 6b are provided. Tubes 7a and 7b are connected to the open ends 6a and 6b, and a temperature adjusting fluid (heated oil, hot water, etc.) flows into the open end 6a from one of the tubes 7a, and the fluid is spirally formed. After descending while meandering, it rises again and flows out from the other open end 6b to the tube 7b. Both cylinders 6
A seal ring 8 is attached to the upper and lower ends of the joint of a and 6b.

Below the second temperature adjusting means B and outside the nozzle portion 2 of the dispenser A, the first portion shown in FIG.
The temperature control means C is provided. The first temperature adjusting means C is attached to the lower end of the second temperature adjusting means B and has a nozzle receiver 13 formed in a cylindrical shape with its tip end covering the outer periphery of the pipe 2b of the nozzle part 2, and a communication hole. (Water pipe)
It is composed of 9 and 9. Explaining the structure of the communication hole 9, openings 9a and 9b are provided on both sides (left and right in FIG. 3) of the nozzle receiver 13, and downward from the openings 9a and 9b (toward the tip of the nozzle 2). Pores 9c and 9d are respectively formed toward the holes.
c and 9d communicate with both ends of a groove 9e which is formed on the outer surface of the pipe 2b by a half circumference (left in FIG. 4). A temperature control fluid supply pipe 10a is connected to one opening 9a, and a discharge pipe 10b is connected to the other opening 9b. Therefore, the temperature control fluid flows from the supply pipe 10a through the opening 9a into the pore 9c,
After passing the groove 2e halfway around the pipe 2b, the pore 9d
Through the opening 9b to the discharge pipe 10b. Thus, when the temperature controlling fluid passes through the groove 9e, the liquid substance inside the needle 2a located inside the pipe 2b is heated or cooled.

Further, in this embodiment, the air injection means D shown in FIG. 4 is provided. The air jetting means D is composed of the nozzle receiver 13 and the air passage 11 described above. The air passage 11 has a groove portion 9e of the nozzle receiver 13.
It is provided on the side opposite to the formation position (on the right side in FIG. 4), and is composed of an opening 11a and a flow hole 11b that connects the opening 11a and the inside of the pipe 2b. Opening 11
An air supply pipe 12 is connected to a. Therefore,
The air supplied from the air supply pipe 12 through the opening 11a enters the inside of the pipe 2b after passing through the flow hole 11b, and has an annular shape formed between the inner peripheral surface of the pipe 2b and the outer peripheral surface of the needle 2a. It is jetted downward in the gap.

The operation of the above embodiment will be described below. A liquid substance (a resin in a molten state) to be discharged is previously stored in the container portion 1a of the dispenser A, and a fluid (oil or hot water) having a predetermined temperature is stored in the spiral water pipe 6 of the second temperature adjusting means B. By circulating, the temperature in the container is kept constant and the viscosity of the liquid substance is kept constant. At the same time, the temperature adjusting fluid similar to that supplied to the spiral water pipe 6 is also circulated in the communication hole 9 of the first temperature adjusting means C. In such a state, the cylinder mechanism (not shown) is driven so that the liquid substance in the container portion 1 passes through the needle 2a of the nozzle portion 2 and is discharged from its tip to a substrate or the like (not shown). The temperature control fluid circulating in the communication hole 9 keeps the temperature of the liquid material passing through the needle 2a constant just before the liquid is discharged, and the viscosity does not change. Therefore, it is possible to always discharge the liquid material in equal amounts under the same conditions.

When the discharge of the liquid material is completed by the above steps, the dispenser A is moved to a cleaning position provided at a position apart from the substrate mounting position, and an air passage is provided via an air supply pipe 12 by a pump or the like not shown. Air is supplied to 11. When the liquid material remains without being completely discharged from the tip of the needle 2a and becomes liquid-dropped or solidifies with the liquid material attached, the air passage 1
The liquid substance remaining at the tip of the needle 2a is blown off and dropped by the air jetted from the nozzle 1 and discharged downward in the gap between the outer peripheral surface of the needle 2a and the inner peripheral surface of the pipe 2b. As a result, it is possible to prevent defects such as nozzle clogging and variations in the ejection amount and ejection characteristics due to the liquid substance adhering to the tip of the needle 2a. In the actual work, the air injection is always performed at the start or the end of the work, or the air injection is periodically performed after the liquid material is discharged a predetermined number of times.

The first and second temperature control means B,
The configuration of C is not particularly limited, and is appropriately set according to the type of liquid material to be discharged and the working environment. In the case of the method using the temperature adjusting fluid as in the above embodiment, the temperature of the liquid material can be freely adjusted by setting the temperature of the fluid arbitrarily. For example, in the above-described embodiment, the heated oil or the like is supplied to the communication hole 9 to supply the nozzle portion 2
Although the liquid substance in the inside is heated, when a hot plate is used, the heat of the hot plate may be transmitted to the nozzle portion 2 and become high temperature. Therefore, by supplying cold water to the communication hole 9, Contrary to the embodiment, it is used to suppress the temperature rise of the liquid material.

The temperature adjusting means B and C are not limited to those using a fluid, and when heating is performed, a heating wire is provided around the container 1 or the nozzle receiver 13 or when cooling is performed. Can adopt various configurations such as a configuration using a Peltier element (semiconductor heat exchange element).

In the above embodiment, the second temperature adjusting means B and the first temperature adjusting means C are completely independent, but for example, the temperature adjusting fluid circulated in the spiral water pipe 6 is directly connected. It is also possible to have a configuration in which both are connected, such as being supplied to the holes 9.

In the above embodiment, the air injection means D
In the configuration, air is blown from the air pump (not shown) to the tip of the nozzle portion 2 through the fine air passage 11, but the configuration is not limited to this, and the air pump may be provided without providing the air passage. Various modifications are possible, such as arranging the air outlet so that it is located near the nozzle portion at the cleaning position.

[0020]

According to the liquid material discharge device of the present invention, the temperature of the liquid material can be controlled by the first temperature adjusting means provided on the outer periphery of the nozzle portion until just before the liquid is discharged from the nozzle portion. It is possible to always discharge the liquid substance in equal amounts without being influenced by the temperature of the liquid.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a liquid material discharge device according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a sectional view taken along line YY of FIG.

[Explanation of Codes] A Dispenser B Second Temperature Control Device C First Temperature Control Device 1 Container 2 Nozzle 9 Communication Hole (Water Pipe) 13 Nozzle Receiver

Claims (3)

[Claims] 1. A dispenser including a container portion for containing a liquid material, a nozzle portion for discharging the liquid material from the container portion, and a first temperature adjusting means provided on the outer periphery of the nozzle portion. A liquid discharge device characterized by having. 2. The first temperature adjusting means is composed of a nozzle receiver located in the vicinity of the outer periphery of the nozzle portion, and a communication hole provided in the nozzle receiver for allowing a temperature adjusting fluid to pass therethrough. Claim 1 characterized by the above-mentioned.
The liquid material discharge device according to item 1. 3. The liquid material discharge device according to claim 1, wherein a second temperature adjusting means is provided on the outer circumference of the container portion.